脉冲气流条件下离心压气机入口流场测量研究

张恺悦; 杨名洋; 舒梦影; 邓康耀

doi:10.3969/j.issn.1001-2222.2020.03.002

车用发动机 ›› 2020, Vol. 0 ›› Issue (3) : 7-11. DOI: 10.3969/j.issn.1001-2222.2020.03.002

栏目

脉冲气流条件下离心压气机入口流场测量研究

张恺悦，杨名洋，舒梦影，邓康耀

作者信息 +

Measurement of Inlet Flow Field of Centrifugal Compressor under Pulsating Conditions

ZHANG Kaiyue，YANG Mingyang，SHU Mengying，DENG Kangyao

Author information +

文章历史 +

摘要

设计一种可用于压气机入口截面流场测量的高频响应全自动步进式测量装置，可使测量探针在入口任意截面的任意测点进行流场测量。将该测量装置配合一维热线风速仪探针，测量离心压气机入口截面的流场分布。将压气机入口剖面分为均布的54个测点，径向均布9个测点，每个测点间隔9 mm，周向每30°进行一轮径向测量直至完成整周测量试验，从而获取整个截面的速度分布。测量工况分别为40 000 r/min稳态工况近堵塞流量点、最高效率点以及20 Hz频率脉冲背压下近堵塞流量点。结果表明：脉冲背压工况下，离心压气机压比流量曲线呈现围绕稳态特性的迟滞环；稳态工况下，离心压气机入口截面流场存在显著畸变，速度分布呈现明显的周向非对称性，出现180°~360°周向角范围的高速区；脉冲背压工况下，入口流场呈现较强的非定常特征：在排空段流场存在较强的周向非对称性，但该非对称性在充满段明显减弱。

Abstract

An automatic stepping measurement system with highfrequency response was designed, whose probe can measure the flow field of compressor at any position in the inlet section .The measuring device was then used to measure the flow field distribution of inlet section of the centrifugal compressor with the help of onedimensional hot wire anemometer probe. All 54 measuring points were distributed uniformly at an interval of 9 mm in the inlet section of compressor with 9 points in the radial direction and the measurement was conducted every 30° along the circumferential direction in a cycle until the whole velocity distribution was acquired. The operating conditions of compressor included 40 000 r/min nearchoked steady state point, highest efficiency point and nearchoked point of 20 Hz pulsating back pressure. It was found that the pressure ratioflow curve of centrifugal compressor exhibited a hysteresis loop around the steadystate characteristic under the pulsating back pressure. Under steady conditions, the inlet flow field had a significant distortion and the velocity distribution exhibited an obvious circumferential asymmetry with a highspeed zone within a circumferential angle between 180° and 360°. In addition, the inlet flow field showed a strong unsteady characteristic under the pulsating back pressure condition. There was a circumferential asymmetry, which became important in the emptying section and weakened in the full section.

导出引用

张恺悦，杨名洋，舒梦影，邓康耀. 脉冲气流条件下离心压气机入口流场测量研究[J]. 车用发动机. 2020, 0(3): 7-11 https://doi.org/10.3969/j.issn.1001-2222.2020.03.002

ZHANG Kaiyue，YANG Mingyang，SHU Mengying，DENG Kangyao. Measurement of Inlet Flow Field of Centrifugal Compressor under Pulsating Conditions[J]. Vehicle Engine. 2020, 0(3): 7-11 https://doi.org/10.3969/j.issn.1001-2222.2020.03.002