Performance Of Turbocharged Diesel Engine Research Articles

Effect of exhaust gas recirculation on the performance and emission characteristics of diesel engine with hydrogen fuel and nano additives

One of the most popular techniques for reducing emissions, in particular nitrogen oxide (NOX), carbon monoxide (CO), carbon dioxide (CO2), and particulate matter (PM), is exhaust gas recirculation (EGR). In an EGR system, the intake manifold is used to re-introduce some of the exhaust gases into the combustion chamber. Diesel engine performance could be enhanced by employing the right number of nano additives. Nano additions aid in increasing efficiency when using hydro fuel. The following systems are impacted by the use of EGR: brake specific fuel consumption (BSFC), diesel engine combustion characteristics, brake thermal efficiency (BTE), engine speed, CO2 and HC emissions, turbocharged diesel engine performance characteristics, fuels, temperature, and on EGR.

Performance In-Live of Marine Engines: A Tool for Its Evaluation

Currently, most ships use internal combustion engines (ICEs) either as propulsion engines or generator sets. The growing concern in environmental protection along with the consequent international rule framework motivated shipowners and designers to replace conventional power systems in order to mitigate pollutant emissions. Therefore, manufacturers have made available on the market many technological solutions to use alternative fuels (Liquefied Natural Gas or LNG, methanol, etc.). However, the main energy source is still fossil fuel, so almost all the ICEs are made up of turbocharged diesel engines (TDEs). TDEs have still the potential to improve their efficiency and reduce fuel consumption and pollutant emissions. In particular, the interpretation of Industry 4.0 given by manufacturers enabled the installation of a robust network of sensors on TDEs, which is able to allow reliable power management systems and make ships much more efficient regarding operating costs (fuel consumption and maintenance) and environmental footprint. In this paper, a software tool that is capable of processing the in-live performance of TDEs is described. The great novelty consists in the ability to process all the information detected by the sensor network in-live and dynamically optimize TDEs’ operation, whereas the common practice involves the collection of performance data and their off-line processing.

Prediction of turbocharged diesel engine performance equipped with an electric supercharger using 1D simulation

The electric supercharger has the advantages of reducing turbo lag and improving low-speed torque of turbocharged engine. The steady-state model using 1D simulation was performed to analyze the effect of the supercharger on the increase of BMEP and the combustion phenomena. Also, transient simulation using a mean value engine model (MVEM) was performed to analyze the improvement of engine response and fuel economy. The differences of engine performance were analyzed according to three locations (Layout A, B, and C) of the supercharger and the air-fuel ratio under controlled and uncontrolled conditions. The BMEPs increased 140.3%, 65.6%, and 17.3%, based on the maximum BMEP of the engine under the air-fuel ratio controlled condition in 1000 rpm, 1250 rpm, and 1500 rpm respectively. The validity of the BMEP analysis can be verified through the results of the combustion pressure; the results seem reasonable in this respect. The volumetric efficiency, maximum combustion temperature, and intake mass flow rate were compared to analyze the cause of volumetric efficiency change by using the supercharger and air-fuel ratio control. In addition, the total fuel consumption decreased by 18 g from 574 g to 556 g owing to the effect of the supercharger in the NEDC simulation.

Assessment of the use of a novel series of oxygenated fuels for a turbocharged diesel engine

This study reports on a turbo-charged diesel engine performance, combustion and exhaust emissions when fuelled with three non-edible biodiesel blends, a neat waste cooking biodiesel (WBD100) and a neat reference diesel (D100). Waste cooking biodiesel was chosen as the non-edible biodiesel for its availability and low cost. Diethylene glycol dimethyl ether (DGM) was introduced as an additive owing to its superior ignitability and high oxygen content. The three blends tested in this investigation were 70/30/0, 70/20/10 and 70/10/20 in proportions of diesel/waste cooking biodiesel/DGM. In all cases, a commercial diesel was taken as the reference fuel for comparative discussion about parameters of the engine performance, combustion and exhaust emissions. A fully-instrumented, 4-stroke, 6-cylinder, turbocharged diesel engine was utilised for the experiments. Without significantly deteriorating engine performance, the three biodiesel blends and WBD100 reduced both particulate matter (PM) and particulate number (PN) emissions remarkably with the expected increase of nitrogen oxides (NOx) emissions.

Study on the Effects of Venturi-EGR System on Turbo-charged Diesel Engine Performance

Study on the Effects of Venturi-EGR System on Turbo-charged Diesel Engine Performance

Effects of the Re-Entrant Bowl Geometry on a DI Turbocharged Diesel Engine Performance and Emissions—A CFD Approach

The purpose of this study is to investigate the influence of re-entrant bowl geometry on both engine performance and combustion efficiency in a direct injection (DI), turbocharged diesel engine for heavy-duty applications. The piston bowl design is one of the most important factors that affect the air–fuel mixing and the subsequent combustion and pollutant formation processes in a DI diesel engine. The bowl geometry and dimensions, such as the pip region, bowl lip area, and toroidal radius, are all known to have an effect on the in-cylinder mixing and combustion processes. Based on the idea of enhancing diffusion combustion at the later stage of the combustion period, three different bowl geometries, namely, bowl 1 (baseline), bowl 2, and bowl 3 were selected and investigated. All the other relevant parameters, namely, compression ratio, maximum diameter of the bowl, squish clearance and injection rate were kept constant. A commercial CFD code STAR-CD was used to model the in-cylinder flows and combustion process, and experimental results of the baseline bowl were used to validate the numerical model. The simulation results show that, bowl 3 enhance the turbulence and hence results in better air-fuel mixing among all three bowls in a DI diesel engine. As a result, the indicated specific fuel consumption and soot emission reduced although the NOx emission is increased owing to better mixing and a faster combustion process. Globally, since the reduction in soot is larger (−46% as regards baseline) than the increase in NOx (+15% as regards baseline), it can be concluded that bowl 3 is the best trade-off between performance and emissions.

PERFORMANCE AND ENERGY BALANCE OF A LOW HEAT REJECTION DIESEL ENGINE OPERATED WITH DIESEL FUEL AND ETHANOL BLEND

In this study, it was aimed to investigate the effect of ceramic coating on a turbocharged diesel engine performance and energy balance. For this purpose, cylinder head, valves and pistons of the engine were coated with yttria stabilized zirconia layer with a thickness of 0.35 mm nickel-chromium- aluminium bond coat, as well as the atmospheric plasma spray coating method with a thickness of 0.15 mm. Then, the engines were tested for full load. The heating values of the diesel fuel and ethanol were 46.2 and 25.182 MJ/kg, respectively. Because of the lower heating values of the ethanol, compared with the diesel fuel, it appears to have lower following to engine power, torque and SFC. Compare to engine power of SDE, LHRe has increased about 2%, LHReth has decreased about 22% at all engine speed. Compare to engine torque of SDE, LHRe has increased about 2.5%, LHReth has decreased about 23 % at all engine speeds. Compare to SFC of SDE, LHRe has decreased about 1.1 %, LHReth has increased about 54 % at all engine speeds. Compare to exhaust turbine inlet temperature of SDE, LHRe has increased about 15 %, LHReth has decreased about 17 % at all engine speeds.

Impact of thermal barrier coating application on the performance and emissions of a turbocharged diesel engine

In this study, the effect of thermal-barrier-coated piston top and combustion chamber surfaces on turbocharged diesel engine performance was experimentally investigated. Satisfactory performance was obtained with TBC1 (with coated cylinder head and valves) and TBC2 (with coated cylinder head, piston top, and valves). Compared with a standard diesel engine, engine power was increased by 2 per cent, the engine torque was increased by 1.5–2.5 per cent, and brake specific fuel consumption (b.s.f.c.) was decreased by 4.5–9 per cent. The NO x emissions were increased by 10 per cent in diesel engines with TBC coatings compared with a standard diesel engine. Experimental studies have shown that there is a reduction in smoke emissions of up to 18 per cent as a result of TBC application.

EFFECT OF HIGH PRESSURE AIR SPRAY ASSISTANT POWER SUPPLY ON AUTOMOTIVE DIESEL ENGINE

A kind of high pressure air spray (HPAS) assistant power supply system is developed in order to improve the performance of turbo-charged diesel engine under low-speed and high-load operations. The control and measuring system of HPAS is discussed. By applying this system the power output increases by 6.9 percent at 800 r·min-1 full-load operation and the smoke opacity decreases by 50 percent under 1000 r·min-1 full-load operation. Effects of HPAS on real time responding characteristics of air intake, power output and smoke opacity under low-speed full-load operations are analyzed and concluded as follows. The intake air pressure and quantity increases while the assistant energy exists. The extent of performance improvement ranges with engine speed. The turbulence resulted from the assistant energy is able to lead the engine into a better quasi-steady state under specific operations.

05/01201 The effect of thermal barrier coating on a turbocharged Diesel engine performance and exergy potential of the exhaust gas

05/01201 The effect of thermal barrier coating on a turbocharged Diesel engine performance and exergy potential of the exhaust gas

The effect of thermal barrier coating on a turbo-charged Diesel engine performance and exergy potential of the exhaust gas

Abstract In this study, the effect of insulated combustion chamber surfaces on the turbocharged, direct injection Diesel engine performance was experimentally investigated. Satisfactory performance was obtained with the low heat rejection (LHR) engine. In comparison to a standard Diesel engine, specific fuel consumption was decreased by 6%, and brake thermal efficiency was increased by 2%. It was concluded that the exhaust gas process was the most important source of available energy, which must be recovered via secondary heat recovery devices. The available exhaust gas energy of the LHR engine was 3–27% higher for the LHR engine compared to the standard (STD) Diesel engine. However, it is impossible to recover all the exhaust gas energy in useful work. It is found that the maximum extractable power is less than 47% of the exhaust power.

Effects of thermal barrier coating on a turbocharged diesel engine performance

Thermal barrier ceramic coatings are successfully used for applications in diesel engines and in the combustion chamber of gas turbine engines, e.g., for nozzle guide vanes, turbine blades, cylinder liners and heads. An experimental investigation into the effects of ceramic coatings on the performance of a diesel engine and exhaust emissions was conducted. Ceramic coatings can eliminate visible smoke, inhibit the formation of NOx, reduce CO and particulate emissions, and improve combustion efficiency. The performance of the diesel ceramic coating was tested on a hydraulic engine dynamometer. The coatings are being evaluated for their ability to control particulate emissions, for emissions in exhaust gases for smoke, horsepower, speed and fuel rate. CO and hydrocarbon levels were lower than baseline levels.