用声响应法测量直喷式柴油机燃烧压力振荡共振频率的研究

Investigation of Measuring Pulsation Frequency of Combustion Pressure in a D.I. Diesel Engine by Method of Acoustic Response

本文根据声波动理论推导出声压波动方程，证明了在密闭空间中声压波动具有与柴油机燃烧室内气体压力振荡相类似的规律性。实验还表明，通过声响应法测量的声压波动共振频率与燃烧压力振荡共振频率是基本相等的。

In the paper, an equation of acoustic wave in a closed space is derived. The results show that the characteristics of acoustic wave in an air tight cavity is similar to those of the combustion pressure oscillation in the combustion chamber of a diesel engine. Experimental results also show that the acoustic pressure frequencies measured by the method of acoustic response are practically equal to those of combustion pressure oscillation in a D.I. diesel engine.