基于非线性谐波法的离心压气机动静干涉流动特性研究

朱伟; 张岩; 郭敏; 付雪青; 曹晓琳; 刘欣源

车用发动机 ›› 2025, Vol. 0 ›› Issue (1) : 60-66.

栏目

基于非线性谐波法的离心压气机动静干涉流动特性研究

朱伟¹，张岩¹，郭敏²，付雪青¹，曹晓琳¹，刘欣源¹

作者信息 +

Study on Dynamic and Static Interaction Flow Characteristics of Centrifugal Compressor Based on Nonlinear Harmonic Method

ZHU Wei¹,ZHANG Yan¹,GUO Min²,FU Xueqing¹,CAO Xiaolin¹,LIU Xinyuan¹

Author information +

文章历史 +

摘要

针对高负荷、小尺寸离心压气机叶轮与扩压器之间存在强烈的非定常扰动问题，采用Numeca软件对带叶片扩压器的跨声速离心压气机进行数值分析，基于非线性谐波法开展动静干涉非定常流动特性研究，探讨动静干涉非定常流动机理。通过试验结果验证数值设置的合理性，对比定常计算与非线性谐波法计算结果，探讨压气机内部流场差异，选取典型工况点对压气机叶轮和有叶扩压器的内部流动及动静干涉非定常流动进行详细分析。研究结果表明：非线性谐波法与定常计算结果在近失速点附近性能差别较大；叶轮与扩压器之间均存在显著的相互干涉作用，包括叶轮与扩压器之间的相互势干扰，以及叶轮尾迹对扩压器流动产生的显著非定常影响；随着工况恶化，叶轮出口周向速度变大，无叶区内出现高速环流甚至封闭水环的现象，对叶轮和扩压器通道流动产生严重堵塞。

Abstract

Aiming at the problem of strong unsteady disturbance between impeller and diffuser of high-load and small-size centrifugal compressor, numerical analysis of transonic centrifugal compressor with vane diffuser was carried out by Numeca software. Based on the nonlinear harmonic method, the unsteady flow characteristics of impeller-diffuser interaction were studied, and the unsteady flow theory was discussed. The rationality of numerical setting was verified by the test results. The difference of compressor internal flow field was discussed by comparing the calculation results of steady and nonlinear harmonic method. The unsteady flow of compressor impeller and the vane diffuser were analyzed in detail by selecting typical working conditions. The results show that the performance of nonlinear harmonic method is different from that of steady calculation near the stall point. There is significant interaction between impeller and diffuser, including potential interference between impeller and diffuser and significant unsteady influence of impeller wake on diffuser flow. With the deterioration of working condition, the outlet circumferential velocity of impeller increases, and a new phenomenon of high speed circulation and even closed water ring appears in the bladeless zone, which severely blocks the flow of impeller and diffuser.

导出引用

朱伟，张岩，郭敏，付雪青，曹晓琳，刘欣源. 基于非线性谐波法的离心压气机动静干涉流动特性研究[J]. 车用发动机. 2025, 0(1): 60-66

ZHU Wei,ZHANG Yan,GUO Min,FU Xueqing,CAO Xiaolin,LIU Xinyuan. Study on Dynamic and Static Interaction Flow Characteristics of Centrifugal Compressor Based on Nonlinear Harmonic Method[J]. Vehicle Engine. 2025, 0(1): 60-66