增压前后柴油机燃烧噪声的对比分析

Comparison and Analysis on Combustion Noise of Diesel Engine with and without Turbocharger

通过测量稳态和恒转速增扭矩瞬态工况增压前后影响燃烧噪声的参数,对比分析得出增压前后柴油机燃烧噪声的变化规律。结果表明:增压后燃烧噪声降低,增压对稳态工况燃烧噪声的降低比对恒转速增扭矩瞬态工况明显,增压在中速中负荷工况下,对燃烧噪声的控制效果较好。并从压力高频振荡、气体动力载荷和燃烧室壁面温度对试验结果进行了分析,证明了增压前后燃烧室壁面温度的差异影响增压前后柴油机燃烧噪声。

By measuring parameters of influencing combustion noise of a diesel engine with and without turbocharger under transient and steady conditions,the combustion noise of the engine with and without turbocharger were comparatively analyzed and the variation of combustion noise in the diesel engine with and without turbocharger was clarified.The result shows that the combustion noise of DI-diesel with turbocharger is reduced,the reduction of combustion noise of the engine with turbocharger under steady condition is more obvious than that under transient condition,the combustion noise can be better controlled at intermediate speed and middle load when the engine is turbocharged.The test result was thoroughly analyzed through the combustion chamber＇s wall temperature,aerodynamic load and high-frequency oscillation of combustion pressure.The difference of combustion noise of the engine with and without turbocharger is caused by the difference of the combustion chamber＇s wall temperature.