Abstract
The diesel engines are superior in terms of power efficiency and fuel economy compared to gasoline engines. In order to optimize the performance of direct injection diesel engine, the effect of various intake pressure (boost pressure) from supercharging direct injection diesel engine was studied at various engine rotation. A single cylinder direct injection diesel engine was used in this experiment. The bore diameter of the engine used was set to 85 mm, the stroke length was set to 96.9 mm, and the compression ratio was set to 16.3. The variation of engine rotation started from 800 rpm to 2 000 rpm with 400 rpm increment. The variation of boost pressure is bounded from 0 kPa boost pressure (naturally aspirated) to the maximum of 60 kPa boost pressure with 20 kPa boost pressure increment. The performance of the engine is evaluated in terms of in-cylinder pressure and heat release rate as the most important performance characteristics of the diesel engine. The in-cylinder pressure and heat release rate of direct injection diesel engine are increased with the elevation of boost pressure at various engine rotation. The raise of engine rotation resulted in the decrease of maximum in-cylinder pressure and heat release rate.
Highlights
With the advancement of technology, the demand for energy in society raises
The relationship between in-cylinder pressure and crank angle at various engine speed and supercharger boost pressure are shown in Figure 2, 3, 4, and 5
The increase of supercharger boost pressure leads to higher in-cylinder pressure for various engine rotation [(800, 1 200, 1 600 and 2 000) rpm]
Summary
With the advancement of technology, the demand for energy in society raises. Coupled with the depletion of fossil fuel and the increasing of human dependency towards it, it is reasonable to assume that the demand for energy will be higher than the available supply of it. Some studies have suggested the reduction of fuel consumption and BSFC (brake specific fuel consumption) with the use of supercharging and several studies have shown the increase of engine power, brake power, and specific power output under supercharged condition [10,11,12,13,14] Another important parameter in engine performance is the heat release rate. The heat release rate of the fuel toward engine cylinder is studied because it causes a variation of gas pressure and temperature within the engine cylinder It strongly affects the fuel economy, power output, gas exchange, emissions, and working processes of the IC engine [9, 15,16,17,18]. Heat release rate provides a good insight into the combustion process that takes place in the engine
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