Exhaust Gas Flow Research Articles

THE IMPACT OF CHROME PLATED COPPER CATALYTIC CONVERTERS ON ENGINE PERFORMANCE WAS EVALUATED BY CHASSIS DYNAMOMETER EXPERIMENT

Emissions produced by motorized vehicles greatly contribute to various environmental and health problems. One technology that is currently being developed to reduce the number of emissions in the environment is the catalytic converter. This technology is proven to be able to reduce exhaust emissions well, but how big the impact on engine performance (torque and power) still needs further research. The main objective of this study was to determine the impact of using chrome plated copper (CuCr) catalytic converters on engine performance. The vehicle used in the test is a Yamaha Vixion Lightning 150 CC. Engine performance (torque and power) was measured using the Inertia Chassis Dynamometer test instrument with the SAE J1349 standard. The findings of this study indicate that the use of experimental exhaust results in a decrease in vehicle torque and power. This is certainly a compromising factor that must be accepted, considering that installing a catalyst is the same as increasing the exhaust gas flow barrier. The decrease in torque and power is still in the acceptable category, considering that the average decrease only occurs at about 5% for torque and 7% for power. All these arguments show that since the main purpose of using catalytic converters is to lower exhaust emissions, it makes engine performance lower than expected.

INVESTIGATE THE EXHAUST GAS FLOW OF A MATCH ROCKET WITH SCHLIEREN PHOTOGRAPHY

INVESTIGATE THE EXHAUST GAS FLOW OF A MATCH ROCKET WITH SCHLIEREN PHOTOGRAPHY

Nano-particle Characteristic Emitted from Gasoline Direct Injection Engine Equipped with Non-Thermal Plasma Device

The impact of non-thermal plasma (NTP) on particulate matter (PM) removal, nitrogen oxide (NOx) reduction, and hydrocarbon species in exhaust gases from gasoline direct injection (GDI) engines using gasoline E20 fuel and a mean effective pressure (IMEP) of 6 bar. The experiments were conducted with an exhaust gas flow rate of 20 L/min, applying high voltage in the range of 0 to 10 kV (2 kV per step) at a frequency of 500 Hz. The results show that NTP reduces PM concentrations, particularly in the nucleation mode (10 nm particles). Maximum PM removal of approximately 83% However, with experimental results, compared to 0 kV, the production of particulate matter Aitken mode increased up to 19 times for a voltage increase of 10 kV, and NOx removal has been at a maximum of about 9.5%, with an energy density of 5 J/L at 10 kV. The effects of NTP on hydrocarbon species such as ethylene, propylene, acetylene, 1.3 butadiene, methane, and ethane have been slightly affected by increased high voltages.

Influence of Exhaust Temperature and Flow Velocity of Marine Diesel Engines on Exhaust Gas Boiler Heat Transfer Performance

Due to the relatively cheap price of diesel, most Marine engines use diesel as Marine fuel, but its emissions contain a lot of carbon. To reduce carbon emissions, International Maritime Organization (IMO) has established an Energy Efficiency Design Index (EEDI) and Energy Efficiency Existing-Ship Index (EEXI). Currently, a popular way is to reduce EEDI by optimizing the heat transfer performance of exhaust gas boilers on new ships, but there is little research on the EEXI index of existing ships. For operating ships, the thermal conductivity of exhaust gas boiler materials and other parameters has been fixed, so the main factors affecting the heat transfer coefficient of the exhaust gas boiler are exhaust gas temperature and flow velocity. Therefore, this paper studies the influence of engine exhaust temperature and flow rate on boiler heat transfer coefficients and optimizes it to achieve the EEXI value required by IMO. Firstly, based on the conservation of mass and energy as the basic equation, a heat exchange model of the exhaust gas boiler is established by using the hybrid modeling method and lumped parameter method. Secondly, for the given boiler, since other parameters are basically unchanged, the input temperature and flow rate of the model are changed by the control variable method, and the temperature of the boiler outlet is simulated by the test algorithm. Through the simulation operation of an Aalborg OC-type boiler, the results show that when the exhaust gas flow velocity is 15 m/s, 17.2 m/s, 22.4 m/s and 25 m/s, respectively, the heat transfer coefficient at each flow velocity increases first and then slowly decreases with the increase of temperature, and there is an optimal temperature at each velocity, which is 230 °C, 227 °C, 225 °C and 224 °C, respectively. The innovation of this study lies in the research on the inlet temperature and flow rate of the exhaust gas boiler of the operating ship based on the EEXI, and the relevant results are obtained, which provides theoretical guidance for the operation management of the exhaust gas boiler of the operating ship.

Investigation on arrangement of thermoelectric modules based on exhaust gas flow direction to minimize mismatch power loss in TEG arrays

The mismatch power loss due to non-uniform distribution of temperature gradient across the modules is a major challenge faced by Thermoelectric Modules (TEMs) in practical applications where there is a drop in temperature of exhaust gas from inlet to outlet. This work presents a new method for arranging TEMs in thermoelectric generator (TEG) arrays to reduce power loss associated with temperature mismatch. To distribute the temperature gradient consistently over series or parallel strings in TEG arrays, the physical placement of the modules is organized based on the exhaust gas flow direction. In this work, two arrangement schemes have been presented for TEG arrays, namely — Column Wise Arrangement (CWA) and Row Wise Arrangement (RWA). Performance of the system is investigated for three different TEG array configurations under various temperature profiles, which are configured in Series (S), Series-Parallel (SP) and Total Cross Tied (TCT) connections. The superior performance of the proposed CWA structure has been validated through a 5 × 5 array in Matlab/Simulink and test setup. Results show that CWA-structured SP and TCT arrays generate 8.08% and 7.96% more power than the RWA structure for a given temperature profile.

Service Based Practical Technology Drinking Water Heater with Heat Smoke Recovery of Multipurpose Diesel Motorcycle Exhaust for Wooden Fisherman Boat Power

The gas power cycle of a four-stroke combustion engine is obtained from a mixture of diesel injection+compressed hot air as the working fluid, which in this case is taken from a versatile type of diesel engine from all kinds of fishing communities on the north coast of Java Island, it can be said that in general the use of multipurpose diesel engines used as a propulsion engine for fishing boats. A common sight for Pantura fishermen is hot smoke exhaust from the exhaust of a multipurpose diesel motor driving a wooden fishing boat released into the air. Eventually, it becomes a source of air pollution around the ship, especially nitrogen oxides, which are toxic to human respiration; hot smoke waste resulting from the combustion process released through the piston engine exhaust system still contains valuable energy potential in the form of hot gas released by the exhaust which if attempted to heat the hot gas energy before being discharged into the ambient air, the heat energy can be recovered by installing additional heat exchangers as a benefit of heat sources for heat exchange heaters or heaters the result is cold drinking water turns into hot drinking water. Heat balance is the calculation of the heat released in the combustion of fuel+air in the combustion chamber and its utilization in the transfer of cold fluids to hot fluids, which is the heat energy content of explosion in compression combustion engines based on fossil fuels. All heat products of combustion cannot be converted 100% into practical motor work or power; energy transfer is lost from the combustion motor, such as 25%, to cooling water 32%, in the exhaust gas 34%, pumping losses, 3%, losses -friction loss between parts due to lousy machining inaccuracy 6% and radiation to the air environment. A drinking water heater with hot smoke recovery from a versatile diesel motor exhaust driving a wooden fishing boat works by recovering or recovering heat energy from the exhaust gas in the exhaust directly from the combustion process cycle in a piston-type combustion engine. The hot flue gas flow is forced into direct contact with the wall of the heat exchanger tube before exiting the exhaust. As long as the piston combustion motor is running, the hot stream from the exhaust gas flows into the shell & tube heat exchanger shell. This experiment aims to get clean hot water 70OC with a linked cold water mass = 0.0064 kg/s at 28OC. Another effect of this experiment is to control exhaust emissions into the atmosphere from internal combustion engines.

THE INSTRUMENTAL ACCURACY OF KNOWN FORMULAS FOR THE CONVERSION OF OPACITY INDICATORS INTO INDICATORS OF TOXICITY OF EXHAUST GASES OF RECIPROCATING ICE

The article analyzes the nomenclature of the most widely used indicators of opacity of exhaust gases of reciprocating internal combustion engines and mathematical apparatuses of known formulas for conversion of indicators of opacity and toxicity of exhaust gases, from which the conversion formula of Prof. Igor Parsadanov as such, which takes into account not only the opacity indicators, but also the indicators of the toxicity of exhaust gases was selected. The analysis and transformation of the selected conversion formula was carried out, and the peculiarities of the influence on the magnitude of the physical value of the independent variables obtained by it were revealed. A method of calculating the instrumental accuracy of obtaining the mass hourly emission of particulate matters with the flow of exhaust gases according to the researched conversion formula in two successive approximations has been developed. According to the results of the calculated study according to the developed methodology for the basic indicator of the opacity of the exhaust gases and the passport accuracy of the measuring equipment, it was established that the average value of such accuracy was ±8.3 % for the special regimes of operation of the reciprocating internal combustion engine. The influence of the type of exhaust gas opacity indexes with its corresponding measurement units on the instrumental accuracy of the studied conversion formula was identified and analyzed. According to the sign of the value of such accuracy for the passport accuracy of the measuring equipment, the known indicators of opacity of exhaust gases are ranked.

Waste Heat Recovery of Exhaust Gas in a Ribbed Double-Pipe Heat Exchanger

The main contribution of this research study is to highlight the crucial role of radiating gas effect combined with circumferential ribs on the inner tube of a double-pipe heat exchanger to obtain higher thermal performance by recovering wasted heat for air heating. By taking the advantage of gases with higher radiative characteristics, significant performance improvement can be obtained by increasing the rate of heat transfer from participating hot exhaust gas flow to the cold air flow. This concept is demonstrated and verified by the numerical solution of the radiative transfer equation coupled with the set of conservation equations of energy, momentum, and continuity in steady-state conditions. The turbulent forced convection is solved by the well-known model to calculate the turbulent stress and heat flux. All computations are done by the COMSOL multi-physics software for a wide range of gas radiative properties in the double-pipe HE with and without ribs. The numerical findings reveal that the contributions of ribs and gas radiation effect in increasing the HE efficiency are 21% and 45%, respectively. In addition, by adding ribs into HE configuration, an increase of pressure drop of 1.76 and 0.71 Pa is observed for the gas and air flows, respectively.

Self-Powered and Robust Marine Exhaust Gas Flow Sensor Based on Bearing Type Triboelectric Nanogenerator

Exhaust gas flow takes a vital position in the assessment of ship exhaust emissions, and it is essential to develop a self-powered and robust exhaust gas flow sensor in such a harsh working environment. In this work, a bearing type triboelectric nanogenerator (B-TENG) for exhaust gas flow sensing is proposed. The rolling of the steel balls on PTFE film leads to an alternative current generated, which realizes self-powered gas flow sensing. The influence of ball materials and numbers is systematically studied, and the B-TENG with six steel balls is confirmed according to the test result. After design optimization, it is successfully applied to monitor the gas flow with the linear correlation coefficient higher than 0.998 and high output voltage from 25 to 106 V within the gas flow of 2.5–14 m/s. Further, the output voltage keeps stable at 70 V under particulate matter concentration of 50–120 mg/m3. And the output performance of the B-TENG after heating at 180 °C for 10 min is also surveyed. Moreover, the mean error of the gas flow velocity by the B-TENG and a commercial gas flow sensor is about 0.73%. The test result shows its robustness and promising perspective in exhaust gas flow sensing. Therefore, the present B-TENG has a great potential to apply for self-powered and robust exhaust gas flow monitoring towards Green Ship.

고체/액체 혼합 입자 분사에 의한 항공기 노즐의 다상 유동에 관한 전산 해석

Infrared (IR) signals from the hot exhaust gases of aircraft engines have a significant impact on the survivability of aircraft. Several methods were developed to reduce IR signatures to avoid tracking by IR signatures generated in the exhaust, or decoy flares are used to deceive IR seekers. Research into injecting water particles to lower the exhaust gas temperature or injecting carbon particles to shield the plume has also been previously conducted. In this study, we propose a method for injecting solid/liquid mixed particles that lower the exhaust gas temperature and block IR signal propagation generated in the exhaust gas. The multiphase flow in aircraft nozzles by solid/liquid mixed particle injection was analyzed using the CFD code for the total flow rate of particles corresponding to 5%, 10%, and 20% of the exhaust gas flow rate. After analyzing the characteristics of the mixed particles interacting with the exhaust plume, the optimal flow rate of water and carbon particles with a small thrust penalty was obtained.

Bir Dizel Jeneratörde Artan Motor Yükünün Egzoz Geri Basıncı Üzerindeki Etkisinin Sayısal ve Deneysel İncelenmesi

In this study, the exhaust back pressure (EBP) behavior resulting from the gradual increase in engine load of the exhaust muffler system used in a diesel engine generator was investigated numerically and experimentally. By examining the compatibility of numerical analysis and experimental test exhaust back pressure results with each other, the possibility of eliminating the need for experimental exhaust back pressure test is examined. Firstly, the exhaust gas temperature and flow rate of the selected diesel engine under five different engine loads were experimentally measured. A reactive muffler with perforated pipe, designed to be integrated into the selected engine, was subjected to computational fluid dynamics (CFD) analyzes using measured exhaust gas temperature and gas flow rate. Numerical EBP values were obtained with these numerical analysis studies, which were carried out using the finite volume method in the ANSYS-Fluent program. Finally, the exhaust silencer system, which was manufactured, was subjected to experimental EBP tests under five different engine loads that were gradually increased. According to the numerical and experimental EBP results obtained, it has been observed that the gradual engine load increase in a diesel generator increases the EBP as parabolic. It was understood that the numerical and experimental results of the EBP for different load conditions became more compatible as the engine load increased, and the numerical analysis error rate was found as 4.06% under the 110% engine load which is the critical load condition. In addition, it was concluded that the need for experimental EBP tests can be eliminated by using only numerical studies in the generator exhaust muffler design.

Simplified Modeling and Analysis of Surface Temperature Distribution in Electrically Heated Catalyst for Diesel Urea-SCR Systems

Impending emission regulations of diesel engines for construction machineries would regulate nitrogen oxide emissions strictly in cold operating conditions. The urea-based selective catalytic reduction (urea-SCR) system coupled with the electrically heated catalyst (EHC) has been considered as a potential measure to meet the strict emission regulations by promoting evaporation and thermal decomposition of urea–water solution in cold operating conditions. Analyzing the thermal conditions in the EHC is crucial for the optimized operation and control of EHC-based urea-SCR systems under various engine operating conditions. In the current study, we introduce a simple one-dimensional analysis scheme to characterize the surface temperature distribution in the EHC based on energy conservation and the theories of forced internal convection. Since the EHC has a complicated internal structure with fine flow cells inside it, a flow cell in the EHC is extracted for the one-dimensional heat transfer analysis. EHC operation parameters such as exhaust gas flow rate and supplied electric power to the EHC are scaled to be applied for the flow cell analysis. The adequacy of the analysis scheme is then validated by surface temperature measurement results at the EHC outlet. The validation results showed over 95% prediction accuracy of the 1D analysis scheme in the operating conditions of a heavy-duty diesel engine. Based on proven reliability, the effects of geometric and operation parameters on the surface temperature distribution in the EHC were analyzed and discussed using the analysis results.

Research on Mobile Machinery NOx Emission Control Based on a Physical Model and Closed-Loop Control

Mobile machinery means a power-driven vehicle that is specifically designed and constructed to perform work on or off the road. To reduce the nitrogen oxide (NOx) emissions that come from mobile machinery, a combination of a physical model and closed-loop control is applied to the selective catalytic reduction (SCR) system. Based on the design of the variable cross-section extended exhaust structure, the differential pressure measurement was achieved, and the physical model of the exhaust flow based on the differential pressure was established. Based on the analysis of the heat and mass transfer process of the SCR catalyst, a prediction model for the internal temperature field of the catalyst was established by combining the upstream and downstream exhaust temperature sensors. Using the SCR downstream nitrogen oxides signal and the proportional–integral–derivative (PID) closed-loop control algorithm, segmented PID closed-loop control under the large hysteresis response of the SCR system was realized. The above algorithms were used to form the control code through MATLAB/Simulink and downloaded to the embedded microprocessor. The test results show that the established model can realize the real-time calculation of the exhaust gas flow rate and the internal temperature of the catalyst. Under steady-state conditions, the calculation error of the exhaust flow rate is less than ±3%, and the calculation error of the catalyst temperature is less than ±5%. Under transient conditions, the calculation error of the exhaust flow rate is less than ±9%, and the calculation error of the catalyst temperature is less than ±8%. The nitrogen–oxygen signal-based PID closed-loop algorithm can improve the nitrogen–oxygen conversion efficiency and control accuracy of the model.

Effect of deposition of carbon deposits on charge flow in EGR valve in CI engine

The exhaust gas recirculation (EGR) valve regulates the exhaust gas flow between the engine exhaust manifold and the inlet one. This allows the inlet air to warm up, improving fuel evaporation and reducing the combustion temperature of the charge. Such a valve reduces the number of harmful substances in the exhaust gas. The valve sticks when too much sediment builds on the walls of the exhaust system, especially during driving in urban conditions or when leaks in the vacuum or exhaust pipes occur. A faulty valve causes the engine to run unevenly at idle speed and under light loads. The defective EGR valve weakens the inlet manifold capacity, increases combustion, clogging of the particulate filter, damage to the lambda probe. A blocked EGR valve may lead to engine immobilization as a result of the operation of its computerized control system. A model of the EGR valve of a selected diesel engine was developed to determine the velocity distribution of the load flowing in it for different values of the degree of valve opening and the volume of deposits on the valve walls. The volume of accumulated carbon deposits on the walls of the EGR valve was measured using a real engine. Based on the recorded mileage of the vehicle, the assumed average speed of the car, and the driving style of the driver, the intensity of deposition of carbon particles on the walls was estimated.

Design and Analysis of Hybrid Turbocharger

Abstract: Internal Combustion engines have the capacity to exploit its increase in performance. Part ofwhich can be boosted by the technical solution that is turbocharging. To optimize the turbocharging to react as fast as possible and to adjust the volumetric flow of exhaust gases in the turbine, different alterations to turbochargers are done. To optimally support downsizing of Internal Combustion engines, these alterations are necessary. In a VGT there are vanes on the compressor that change the A/R of the turbo as needed. VGTs show a great improvement over conventional single turbocharger. Sequential turbocharger has an edge over VGT, but they are much more complicated. A 2.2L sequential turbocharged engine is same in performance as a 2.7L VGT engine. Exhaust gas turbocharging is a major technology for reducing fuel consumption and emissions in internal combustion engines, improving engine performance while cutting CO2 emissions. There are also electric turbochargers that almost totally eliminate turbo lag by using a motor to spin the compressor and use a generator on the turbine to recover exhaust gas energy. This application reduces fuel usage by up to 5% for driving cycles. EATC reduced the time it took to reach the optimum boost level during a load increase by up to 30%. Turbocharging is a major technology for reducing fuel consumption and emissions in internal combustion engines, improving engine performance while cutting CO2 emissions. Hybrid Turbocharging application leads to remarkable improvement at lowend torques, better engine performance and increased overall engine efficiency which paves way for downsizing of Internal Combustion engines. Keywords: Internal Combustion Engine, Hybrid turbocharger, Turbo-lag, VGTs

Application of numerical simulation for the modernization of the exhaust system of gas turbine engines

Objective. The aim of the study is to modernize the design of the exhaust system of gas turbine engines (GTE) in order to reduce aerodynamic losses using numerical methods (CFD methods) for simulating the flow of exhaust gases.Method. The directions of modernization were chosen by considering the pattern of the flow of exhaust gases (separated flow zones and vortex flows) in the exhaust system during numerical modeling (Computational Fluid Dynamics). The modernization of the exhaust system consists in profiling the axial diffuser and changing the design of the gas collector.Result. The profiling of the axial diffuser was performed using numerical simulation methods. The design of the gas collector was changed based on the technical solution proposed by V.B. Yavkin. Numerical simulation of the flow of exhaust gases in the modernized exhaust device was performed. To evaluate the results of modernization in numerical models of the modernized design and prototype, the values of aerodynamic losses at the outlet of the axial diffuser and gas collector were determined.Conclusion. CFD modeling made it possible to obtain data on the structure of the exhaust gas flow in the upgraded exhaust system, to see the pattern of the distribution of velocities and pressures. The results of the numerical experiment showed a decrease in pressure losses in the exhaust system by 11% relative to the prototype.

Local entropy generation and exergy analysis of the condenser in a direct methanol fuel cell system

This paper aims to identify the irreversibilities in the condenser of a direct methanol fuel cell (DMFC) system and present possible enhancements in its design through local entropy generation analysis (L-EGA). For this purpose, the local entropy generation terms originating from heat and mass calculated from results of a pseudo two-phase computational fluid dynamic (CFD) model of the condenser. Through this analysis, the total irreversibilities due to heat and mass transfer are calculated locally (e.g., film boundary layer, vapour-gas boundary layer) under the variable operating conditions of a DMFC (undersaturated, saturated, and supersaturated conditions of the cathode exhaust gas). Moreover, the exergy destruction ratio of condenser is found to estimate the exergy performance of the condenser. The results show that in the case of supersaturated cathode exhaust gas (CEG) flow, the entropy generation rate due to mass transfer in the film region is found as 0.032 W/(m·K) which is 18 times higher than that for the undersaturated CEG flow. However, entropy generation rate due to mass transfer decreases significantly when the hot flow is just over the film region. In the film region, the entropy generation rates originating from heat transfer are found as 0.0055 W/(m·K) (for the undersaturated case), 0.0032 W/(m·K) (for the saturated case), and 0.0015 W/(m·K) (for the supersaturated case). Moreover, the maximum exergy destruction ratio is found as 0.72 when the CEG is undersaturated and the CEG velocity is 0.18 m/s, while the lowest exergy destruction ratio is calculated as 0.28 when the CEG is saturated.

BIODIESEL AS A LUBRICITY ADDITIVE FOR DIESEL FUEL

Sulfur in diesel fuel will influence particulate matter emission either in exhaust gasflow or in atmosphere. The other effect of sulfur it can cause corrosion and engine wear.Further, sulfur also can influence on catalytic system in exhaust pipe. Due to this reasonsulfur level in diesel fuel should be set as lower as possible. The process can be used toreduce sulfur level is desulfurization process (hydrotreatment). At the hydrotreatment todesulfurize diesel fuel, lubricity can decrease, it is cause by reduction of fuel componentswhich have good natural lubricity.Lubricity, is very relevant to the satisfactory operation of diesel fuel engines whichrelay on the fuel to lubricate many of the moving and rubbing metal parts of the fuelinjection equipment. Some injection equipment may be at risk if operated on fuels of lowlubricity.Biodiesel as results of transesterification has a good lubricity, the test results of addingbiodiesel into a lower lubricity of diesel fuel indicate that biodiesel can be used to increasediesel fuel lubricity.

3-D Numerical Study of Effect of Urea Injector Location and Intake Cone Geometry on SCR Performance

In response to current strict laws aiming to reduce motor vehicle emissions, more and more research projects are being carried out in order to enhance the flow of automotive catalysts. There have been substantial efforts to further refine the SCR technology (selective catalytic reduction) for diesel-powered vehicles. Furthermore, only a little distance from the catalytic input between the exhaust system is available for a mobile SCR system. This therefore leads to an insufficient urea residence period, and evaporation and thermolysis at the catalyst entry cannot therefore be completed. This can lead to substantial secondary ammonia and isocyanic acid emissions. Therefore, fast thermolysis, effective ammonia blend with exhaust gas and reduction of ammonia slip are crucial factors for the deployment of SCR technology on cars. The Computational Fluid Dynamics (CFD) approach is used for optimizing the exhaust gas flow inside the existing catalyst by changing intake cone designs which is intended to be used on Euro VI/Bharat Stage-VI emissions legislation compliant heavy-duty diesel engines in India. This study is divided in to two parts. The first part of the study deals with finding the optimized ammonia injector location, and in the second part, the proposed inlet cone design’s flow velocity uniformity index is estimated and compared with that of the existing SCR catalyst model.

Data Driven Modeling of Turbocharger Turbine using Koopman Operator

A turbocharger plays an essential part in reducing emissions and increasing the fuel efficiency of road vehicles. The pulsating flow of exhaust gases, along with high heat exchange from the turbocharger casing, makes developing control-oriented models difficult. Several researchers have used maps provided by manufacturers to solve this problem. These maps often fail to incorporate any heat transfer effects and are unsuitable for wide operating regions. Also, with the availability of more and better sensor data, there is a need for a method that can exploit this to obtain a better predictive model. Koopman approaches rely on the observation that one can lift the nonlinear dynamics of the turbine into an infinite-dimensional function space over which dynamics are linear. The objective of this paper is to develop a model to predict the transient and steady-state behavior of the turbine using the Koopman operator which can be helpful for control design and analysis. Our approach is as follows. We use experimental data from a Cummins heavy-duty diesel engine to develop a turbine model using Extended Dynamic Mode Decomposition, which approximates the action of the Koopman operator on a finite-dimensional subspace of the space of observables. The results demonstrate superior performance compared to a tuned nonlinear autoregressive network with an exogenous input model widely used in the literature. The performance of these two models is analyzed based on their ability to predict turbine transient and steady-state behavior.