Influence of multiple pre-injection strategies on diesel engine combustion noise
To reduce the combustion noise of a diesel engine,a bench test platform is established to analyze the changes in cylinder pressure,pressure rise rate,and noise under one and two pre-injection strategies.GT Power software is used to establish a combustion simulation model,analyzing the influence of different pre-injection angles and pre-injection quantities on combustion noise under two pre-injection strategies.The experimental results show that compared with the one pre-injection strategy,the peak cylinder pressure and pressure rise rate of the two pre-injection strategies decrease,the maximum peak pressure rise rate decreases by about 0.1 MPa/(°),and the combustion noise decreases by 5.2 dB.The simulated cylinder pressure and pressure rise rate are similar to the experimental results,and the simulation model is accurate.The combustion noise of the bench test corresponding to the fuel injection strategy with the first pre-injection crankshaft angle of-20° and the amount of 1.4 mg,and the second pre-injection crankshaft angle of-11° and the amount of 1.2 mg,is significantly lower than the original test noise.The optimized bench test combustion noise is significantly lower than the original test noise.
NETL
NSTL
万方数据
维普
