基于联合运行规律的增压器压气机非定常流动模拟

Simulation of Unsteady Flow Characteristics of a Vehicle Turbocharger Compressor Based on Internal Joint Operating Law

摘要:

为了提高压气机在非定常流动状态下与增压器的匹配精度，基于增压器运行工况提出了内部联合运行规律，并开展不同结构压气机的非定常流动特性和性能修正研究。结果表明，在3种结构压气机中，除了高速大流量联合工况外，采用进口直径减小1 mm的等长叶片压气机的非定常流动性能有明显优势，且喘振性能更好。基于非定常系数对压气机性能修正后，压气机性能更接近实际工作状态。

Abstract:

In order to improve the matching accuracy between the compressor and the turbocharger under the unsteady flow condition， the internal joint operation law method was proposed based on the turbocharger operating conditions， and the unsteady flow characteristics of the compressor with different structures and performance correction were studied. The results shows that among the three structures of compressors， except for the high speed and high flow rate joint point operation condition， the unsteady flow performance of the equal-length blade compressor with a 1 mm reduction in inlet diameter has obvious advantages and a better surge performance. After the correction of compressor performance based on the unsteady coefficient， the performance of the compressor was closer to the real working condition.