Abstract
s: Diesel fuel injection is the most dominant in ignition process of the diesel engines combustion. Diesel engines have been widely used in heavy-duty and light-duty vehicles due to their higher fuel economy, efficient and powerful than spark ignition (SI) engines. The principal objective of this research is to seek the effect of temperature and pressure on the spray characteristics, as well as fuel-air mixing characteristics. Experiments were performed in a constant volume chamber at specified ambient gas temperature and pressure. This research was continued with injecting diesel fuel into the chamber using a Bosch common rail system. Direct photography technique with a digital camera was used to clarify the real images of mixture formation such as spray penetration, fuel evaporation and spray interference. The liquid phase of the spray reaches a maximum penetration distance soon after the start of injection, while the vapour phase of the spray continues to penetrate downstream. The condition to which the fuel is affected was estimated by combining information on the wall chamber temperature, ambient temperature and photographs of the spray. The increases in ambient pressure inside the chamber resulting in gain of spray area and wider spray angle. Thus predominantly promotes for a better fuel-air premixing.
Highlights
Diesel engine known as a compression ignition (CI) engine that uses the heat of compression to initiate ignition to burn the fuel into the combustion machine contrast to spark ignition engines (SI)
The ambient temperature can be controlled by adjusting heating system as thermocouple was screwed into the chamber to be able to measure the temperature as well as withstand the pressure of the combustion chamber
Pressure of the constant volume chamber was increased from 100 kPa up to 600 kPa at 100 kPa intervals and the temperature of the combustion chamber walls was set at 20, 50, 70 and 85 °C in all pressure tests conducted
Summary
Diesel engine known as a compression ignition (CI) engine that uses the heat of compression to initiate ignition to burn the fuel into the combustion machine contrast to spark ignition engines (SI). Direct injection combustion system was used to investigate the effect of temperature and ambient pressure on fuel air-mixing and flame development. The parameters that will be investigated are the ambient pressure and pressure of the combustion chamber. Many efforts have been put to meet more and more stringent new emissions regulations due to development of diesel engine while at the same time enhancing the performance of diesel engines[1].A constant volume chamber is an excellent tool to study effect of temperature on auto ignition of combustible mixtures as it gives direct measure of ignition delay[2,3]. The effects of temperature on ignition process are investigated up to the initial stages of pressure rise, which occurred as a result of net heat release due to evaporation of fuel and heating. Based on the obtained data, a relation between temperature rises and spray formation could be observed
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