基于CFD的罗茨机械增压器减小气流脉动方法仿真研究

Reducing Gas Pulsation Methods Research of Roots type Supercharger Based on CFD

针对罗茨机械增压器工作时排气口高压气体向基元容积回流所引起的气流脉动现象,通过FLUENT动网格技术分别并对传统、逆流冷却和渐扩缝隙三种不同壳体结构的机械增压器进行数值模拟分析,描述机械增压器内部湍流流动的流场分布和气流脉动特征规律,计算结果表明:不同壳体结构影响增压器内部气流漩涡尺度大小,且逆流冷却和渐扩缝隙壳体结构能有效地消减排气时的气流脉动。本文数值分析结果,可为研究机械增压器气流脉动和壳体结构设计优化提供依据。

For the Roots type supercharger gas pulsation problem caused by high pressure gas reflux from outlet to primitives volume. With help of software fluent, dynamic technology was adopted to simulate the inside flow field of three different shell structure, general, eountercurrent cooling and gradually expanding gap structure. Describing internal turbulent flow distribution and the characteristic of gas pulsation. The results show that different shell structure affects the size of vortex and countercurrent cooling and gradually expanding gap shell structure have good effect of gas pulsation eliminating. According to the simulation results, this paper provide reference for the research of gas pulsation and the structural optimization of the supercharger.