Diesel Injector Fuel Injector 095000-8100 095000-8871 Denso Injector for Zhongqi

Simulation Study on the Impact of Uneven Fuel Injection of Each Hole of the Diesel Engine Injector on the Combustion Process (PART 2)

1 Introduction

The spray and combustion of diesel are important factors affecting engine emission and fuel economy. As the terminal of the fuel injection system of the diesel engine, the injection characteristics of the nozzle have a direct impact on the distribution of fuel in the combustion chamber, the fuel atomization quality, and the injection duration, thus affecting the combustion in cylinder and the performance of the engine [1-3]. Researchers have carried out a lot of research on the impact of injection rate on the diesel engine combustion process from the aspects of test and simulation calculation, but most of them are based on the general injection rates of the fuel injector [4, 5]. However, due to the difference in the structure, processing and high-pressure hydraulic conditions during use, the injection rate of each hole of the multi-hole injector is inconsistent, and this will lead to uneven fuel space and time distribution in the combustion chamber, thus resulting in changes in the spray and combustion process.

The spray impulse and injection pressure of each hole of the 4-hole injector of F186 engine are tested by using the transient test system for flow coefficient and injection rate of each hole of the injector, and the injection rate, fuel injection quantity and flow coefficient of each hole are obtained. According to the measured whole injection rate and cycle fuel injection quantity, a 3D model of the diesel engine is established with the FIRE software. Based on the uniform injection rate and uneven injection rate of each hole made as the injection setting, the combustion process is simulated to comparatively analyse the influence of the uneven injection rate of each hole on the combustion process of diesel engine, so as to provide a basis for more accurate description of its combustion process.