直喷式柴油机燃烧噪声传递函数的试验研究

通过改变燃烧室结构和压力脉冲的大小 ,测量压力脉冲和噪声信号 ,求取燃烧噪声传递函数 ,并对不同方法求取的传递函数进行比较分析。设计适当的时间窗获取正常工况下的活塞拍击噪声和燃烧噪声 ,并与用传递函数和测量的缸内燃烧压力计算所得的燃烧噪声进行比较分析 ,对活塞拍击特性进行了分析 。

In this paper, the transfer function of the combustion noise is obtained by measuring the pressure and noise signal. The transfer functions are compared and analyzed that gained from the different structure of the combustion chamber and pressures. The combustion noise that included the piston impinging noise is gained by time window and compare with the combustion noise that gained by combustion noise’s transfer function and combustion pressure. The character of the piston impinging is analyzed. The method of study the theory of combustion noise is provided.