Performance Parameters Of Diesel Engine Research Articles

Investigation of Seasonal Effects on Two-Stroke Marine Diesel Engine Performance Parameters and Emissions

Investigation of Seasonal Effects on Two-Stroke Marine Diesel Engine Performance Parameters and Emissions

Combined effect of ‘biodiesel, ethanol, exhaust gas recirculation and magnetization of fuel’ on the performance and emission parameters of diesel engine.

Utilization of biodiesel as alternative fuel results in higher emission of oxides of nitrogen (NOx) and reduced performance parameters. Exhaust gas recirculation (EGR) is a great technology to control the emission of NOx, but use of EGR reduces the performance parameters of diesel engines. Oxidative addition and magnetization of fuel help to make the combustion complete. In the present investigation, Jatropha biodiesel has been used with diesel in the form of a blend having 20% biodiesel (BD20) as fuel in 4-stroke, direct ignition, diesel engine. 5% Ethanol (E5) has been used as additive along with biodiesel blends and 10% EGR. The magnetization of fuel (MF) has been done with the help of a permanent magnet having strength of 3000 gauss. The results of this investigation show that BD20 is beneficial as fuel for reducing emissions like Carbon Mono-oxide, Hydro-Carbon, and smoke but it reduces Brake Power and Brake Thermal Efficiency. BD20E5 gives better performance parameters than the BD20, but the emission of HC increases slightly. 10% EGR reduces NOx emission with a small cost of performance parameters but with MF performance and emission parameters were improved.

Research on the Combustion, Energy and Emission Parameters of Various Concentration Blends of Hydrotreated Vegetable Oil Biofuel and Diesel Fuel in a Compression-Ignition Engine

This article presents our research results on the physical-chemical and direct injection diesel engine performance parameters when fueled by pure diesel fuel and retail hydrotreated vegetable oil (HVO). This fuel is called NexBTL by NESTE, and this renewable fuel blends with a diesel fuel known as Pro Diesel. A wide range of pure diesel fuel and NexBTL100 blends have been tested and analyzed: pure diesel fuel, pure NexBTL, NexBTL10, NexBTL20, NexBTL30, NexBTL40, NexBTL50, NexBTL70 and NexBTL85. The energy, pollution and in-cylinder parameters were analyzed under medium engine speed (n = 2000 and n = 2500 rpm) and brake torque load regimes (30–120 Nm). AVL BOOST software was used to analyze the heat release characteristics. The analysis of brake specific fuel consumption showed controversial results due to the lower density of NexBTL. The mass fuel consumption decreased by up to 4%, and the volumetric consumption increased by up to approximately 6%. At the same time, the brake thermal efficiency mainly increased by approximately 0.5–1.4%. CO, CO2, NOx, HC and SM were analyzed, and the change in CO was negligible when increasing NexBTL in the fuel blend. Higher SM reduction was achieved while increasing the percentage of NexBTL in the blends.

Multi-response optimization of DI diesel engine performance parameters using Karanja methyl ester by applying Taguchi-based principal component analysis

ABSTRACTThis paper investigates the optimization of parameters using the Taguchi method and principal component analysis (PCA). Five controllable factors were selected for optimization. The single-objective optimization of performance and emission characteristics was studied by the Taguchi approach. PCA has been adapted to transform a multi-objective optimization problem into a single objective function, called a composite principal component. Results of PCA were analyzed by a confirmation experiment.

基于Modelica的船用柴油机建模与仿真

针对传统柴油机热力系统建模过程中模块化、可重用性、可扩展性和参数化方面的相对欠缺，从基本物理规律出发详细分析了柴油机各部件数学模型，采用面对对象的陈述式建模语言Modelica，以图形化和模块化的方式在Dymola仿真平台上建立了柴油机各主要部件的模型库，使模型具有很好的扩展性和可重用性。通过对模型进行仿真分析并与实测数据进行对比，结果表明：模型具有较高的精度，基于该模型对柴油机进行性能分析可信度较强。最后，在模型的基础上，分析了不同压缩比和供油提前角对柴油机标定工况下主要性能参数的影响，所得结论具有一定理论和工程实用价值。 In view of the relative lack of modularization, reusability, extensibility and parameterization in the traditional modeling process of the diesel engine, the mathematical model of each component of the diesel engine is analyzed from the basic physical laws. By using the object-oriented modeling language Modelica, the model base of the main components of the diesel engine is built on the Dymola simulation platform in a graphical and modular way. The model has good expansibility and reusability. Through the simulation analysis and comparison with the measured data, the results show that the model has a high precision. The performance analysis of the diesel engine is reliable based on this model. Finally, the effects of different compression ratio and fuel supply advance angle on the main performance parameters of diesel engine are analyzed. The conclusion has a certain theoretical and practical value.

Analysis of Engine Performance Parameters of Electrically Assisted Turbocharged Diesel Engine

Charging system is used to increase the charge density. Supercharging system suffers from fuel consumption penalty because of compressor powered by engine output. Turbocharging system uses wasted exhaust energy that means compressor powered by exhaust turbine but has a turbo lag problem. The electrically assisted turbocharger which can eliminate turbo lag problem and fuel consumption penalty is the topic of this paper. The purpose of this paper is to analyze the effect of electrically assisted turbocharger on diesel engine performance parameters. The AVL Boost software program was used to simulate the electrically assisted turbocharged diesel engine. Simulations results showed that electrically assisted turbocharger increases low end torque and improves fuel economy.

EXPERIMENTAL STUDY OF THE EFFECTS OF AIR-INJECTION, INJECTION TIMING AND COOLED EGR ON THE COMBUSTION, EMISSIONS AND PERFORMANCE OF A NATURE ASPIRATED DIRECT INJECTION DIESEL ENGINE

In this literature, a combined method has been employed to simultaneously reducesmoke (Soot) and oxide of nitrogen (Nox) and maintain the performance parameters of dieselengine. This includes creating an air jet by designing an air-cell inside the piston body, advancedinjection timing and using cold exhaust gas recirculation. The tested engine was an MT4.244engine that worked as natural aspiration. The air-cell causes reduction in both Soot and NOxemissions. Furthermore, applying cold EGR had a noticeable effect on NOx emission reduction.Advancing injection timing, the performance parameters of the engine could be improved. Thetests were done in 25%, 50%, 75% and 100% load conditions, for the engine speed of 2000 rpm.The results showed that by simultaneous reduction of Soot and NOx emissions, performanceparameters can be kept in a suitable range. The greatest reductions in NOx and Soot emissionshave been observed in 100% load. There have been no considerable changes in BSFC (BrakeSpecific Fuel Consumption and power) while injection timing advances have been applied for5° CA and 5% EGR.

Modelling the effect of injection pressure on heat release parameters and nitrogen oxides in direct injection diesel engines

Investigation and modelling the effect of injection pressure on heat release parameters and engine-out nitrogen oxides are the main aim of this study. A zero-dimensional and multi-zone cylinder model was developed for estimation of the effect of injection pressure rise on performance parameters of diesel engine. Double-Wiebe rate of heat release global model was used to describe fuel combustion. extended Zeldovich mechanism and partial equilibrium approach were used for modelling the formation of nitrogen oxides. Single cylinder, high pressure direct injection, electronically controlled, research engine bench was used for model calibration. 1000 and 1200 bars of fuel injection pressure were investigated while injection advance, injected fuel quantity and engine speed kept constant. The ignition delay of injected fuel reduced 0.4 crank angle with 1200 bars of injection pressure and similar effect observed in premixed combustion phase duration which reduced 0.2 crank angle. Rate of heat release of premixed combustion phase increased 1.75 % with 1200 bar injection pressure. Multi-zone cylinder model showed good agreement with experimental in-cylinder pressure data. Also it was seen that the NOx formation model greatly predicted the engine-out NOx emissions for both of the operation modes.

Application of Space-time Conservation Element and Solution Element Method in Intake and Exhaust Flows of High Power Density Diesel Engine

Abstract A one-dimensional pipe flow model of single-cylinder diesel engine is established to investigate the intake and exhaust flow characteristics of diesel engine in the condition of high power density (HPD). A space-time conservation element and solution element (CE/SE) method is used to derive the discrete equations of the partial differential equation for the intake and exhaust systems. The performance parameters of diesel engine with speed of 2100 r/min are simulated. The simulated results are in accordance with the experimental data. The effect of increased power density on charging coefficient is analyzed using a validated model. The results show that the charging coefficient is slowly improved with the increase in intake pressure, and is obviously reduced with the increase in engine speed.

Study on Mechanical Automation with Cool-Starting Capacity of the Battery for Vehicles

It is advanced that cool-starting capacity of the battery is the key factor that affects the cool-starting performance of diesel engine. Cool-starting capacity of the battery is mainly affected by these factors,such as, the structure of the polar board, discharge electric current, temperature and density of the electrolyte. By optimally calculating the parameters above, optimal performance parameters of diesel engine at low temperature are received. Two performance tests of the diesel engine at low temperature,both Cool-Starting torque and starting rotate speed,are made on the basis of the cool-starting system of diesel engine,which completely satisfy the cool-starting requirements of the diesel engine at low temperature.

Optimization of performance parameters of diesel engine with Jatropha biodiesel using response surface methodology

The present work was focused to investigate the influence of injection timing, load torque and engine speed on the performance and emissions and to optimize these parameters using response surface methodology (RSM) for Jatropha biodiesel operation in a diesel engine. For this investigation, experimental parameters were designed by using full factorial design with 27 runs. The effect of variation of injection timing, load torque and engine speed on BSFC, BTE, P max, CO, HC, NO emissions and smoke were investigated experimentally. Response surface models have been developed using experimental data. The optimal values of performance and emission parameters: BSFC, BTE, P max, smoke density, CO, HC and NO emissions are 0.2875 kg/kWh, 30.96%, 65.79 bar, 4.26, 0.0076 vol%, 5.27 and 321.69 ppm, respectively, at fuel injection timing, load torque and speed of 342.6 CAD were 11.4 Nm and 1801 rpm, respectively, for the Jatropha biodiesel engine using RSM.

Multi-response optimization of diesel engine performance parameters using thumba biodiesel-diesel blends by applying the Taguchi method and grey relational analysis

This paper presents an experimental study that involves an application of the Taguchi method and grey relational analysis to determine the optimum factor level to obtain optimum multiple-performance characteristics of a diesel engine run with different low-percentage thumba biodiesel-diesel blends. Four factors, namely, low-percentage thumba biodiesel-diesel blend, compression ratio, nozzle opening pressure and injection timing were each considered at three levels. An L9 orthogonal array was used to collect data for various engine performance- and emission-related responses under different engine loads. The signal-to-noise (S/N) ratio and grey relational analysis were used for data analysis. The results of the study revealed that the combination of a blend consisting of 30% thumba biodiesel (B30), a compression ratio of 14, a nozzle opening pressure of 250 bar and an injection timing of 20° produces maximum multiple performance of a diesel engine with minimum multiple emissions from the engine.

Simulation of quasi-dimensional model for diesel engine working process

In order to satisfy the demand of validity and real time operating performance of diesel engine model used in hardware-in-the-loop simulation system, a simplified quasi-dimensional model for diesel engine working process was proposed, which was based on the phase-divided spray mixing model. The software MATLAB/Simulink was utilized to simulate diesel engine performance parameters. The comparisons between calculated results and experimental data show that the relative error of power and brake specific fuel consumption is less than 2.8%, and the relative error of nitric oxide and soot emissions is less than 9.1%. At the same time, the average computational time for simulation of one working process with the new model is 36 s, which presents good real time operating performance of the model. The simulation results also indicate that the nozzle flow coefficient has great influence on the prediction precision of performance parameters in diesel engine simulation model.

Grey Theory Approach to Sequential Turbocharged Diesel Engine

In order to ensure diesel engine operating reliably, need to forecast the performance parameters of diesel engine. Grey system theory, a method to research poor information and uncertain system, was approached to sequential turbocharged diesel engine. Grey forecast model of boost pressure of sequential turbocharged diesel engine was established. The precision of the forecast model was inspected by grey relation analysis, it is proved that the model has a good precision and is suitable to forecasting boost pressure. The relatively error of the forecast result is 2.5%. And it establishes the base for forecasting control and failure prediction of diesel engine sequential turbocharging system.

Preliminary investigation on fuel related properties of clove stem oil–diesel blended fuels and performance parameters of diesel engine

Oil extracted from clove stems was tested for several important fuel properties and compared with standard diesel fuel. The viscosity of this oil lies between the minimum and maximum required values of the standard diesel fuel. It has very low cetane number (CN) and high density. The CN of this oil prohibits its direct use as an alternative fuel in diesel engines, but it could be used in blends with standard diesel fuel, because most of the determined properties of clove stem oil (CSO)-diesel blended fuels were very close to the South African requirements (SABS 324) for automotive standard diesel fuel. Engine tests show that performance parameters of the CSO-diesel blended fuels do not differ greatly from those of the standard diesel fuel. Slight power losses, combined with an increase in fuel consumption, were experienced with CSO-diesel blended fuels. This may be due to the lower heating value of the CSO-diesel blended fuels. Emissions of CO and HC are low for CSO-diesel blended fuels. NO x emissions were increased remarkably when the engine was fuelled with 50% CSO-diesel blended fuel.