大气环境下柴油机尾排气管口边界条件及声辐射  

Boundary Condition and Sound Radiation at an Open Exhaust of Diesel Engine

作　　者：张文平 张志华[1] 马强[1] 

机构地区：[1]哈尔滨工程大学

出　　处：《内燃机学报》1995年第2期197-202,共6页Transactions of Csice

摘　　要：在用不稳定流动方法模拟柴油机大气环境条件下排气噪声中，本文给出了考虑尾管口处压力波动的非等熵准定常边界条件，而在排气声辐射中采用Ｈｏｗｅ公式。两者相结合，能够从管口透射声功率的角度对管口辐射噪声进行更为合理的描述。计算与测量结果吻合较好。该边界条件也适用于大气环境下柴油机性能模拟。Nonconstant boundary model of an open exhaust was presented, in which pulsive pressure atthe open can be calculated, in numerical simulation of exhaust noise from diesel engine in air bymeans of characteristics method. Together with Howe's formula based on accoustic energy escaped from the exhaust pipe and one radiated into free space, the model is reasonable in predictionof exhaust noise radiation from the open. The calculated results agree with ones measured. Themodel is also useful for simulation of performance of diesel engine.

关 键 词：柴油机 尾管口 边界模型 排气噪声 

分 类 号：TK421.6[动力工程及工程热物理—动力机械及工程]