进口导叶对S-CO2离心压缩机内部流动及性能的影响研究
Effect of Inlet Guide Vanes on Flow Behavior and Performance of S-CO2 Centrifugal Compressors
裴瑾泽 1王绍成 2赵钊 2于泳强 1赵远扬1
作者信息
- 1. 青岛科技大学机电工程学院,山东省 青岛市 266061
- 2. 北京航天动力研究所,北京市 丰台区 100076
- 折叠
摘要
超临界二氧化碳(supercritical carbon dioxide,S-CO2)布雷顿循环被认为是具有前景的动力循环之一,S-CO2压缩机性能对循环热效率有很大影响.该文以带进口导叶的S-CO2 离心压缩机为研究对象,采用数值模拟方法探究预旋角度对S-CO2离心压缩机内部流动和性能的影响.结果表明:预旋角绝对值的增大会加剧导叶吸力面侧的流动分离,导叶段总压损失与叶轮进口处流动不均匀程度也随之增大;随着正预旋角度增大,叶轮进口处相对气流角和相对速度减小,叶片吸力面侧膨胀加速和流动分离减弱;较大的正预旋角度会导致大流量工况下进口导叶段出现两相区流体.该文研究结果可为S-CO2离心压缩机进口导叶调节提供一定参考.
Abstract
The supercritical carbon dioxide(S-CO2)Brayton cycle is widely recognized as a promising power cycle,where the performance of the S-CO2 compressor is crucial in determining the thermal efficiency of the cycle.In this study,the effect of the pre-swirl angle on the flow behavior and performance of the S-CO2 centrifugal compressor with inlet guide vane is investigated by numerical simulation.It is observed that an increase in the absolute value of the pre-swirl angle exacerbates flow separation on the suction side of the guide vane,elevating the total pressure loss within the guide vane section and intensifying flow non-uniformity at the impeller inlet.With the increase of the positive pre-swirl angle,the relative flow angle and relative velocity at the impeller inlet decrease,the expansion of the suction side of the blade accelerates and the flow separation weakens.The large positive pre-swirl angle results in a two-phase flow within the inlet guide vane section under high flow conditions.A reference for the study of inlet guide vane regulation of S-CO2 centrifugal compressor is provided by this research work.
关键词
离心压缩机/导叶/超临界二氧化碳/布雷顿循环/流动分析Key words
centrifugal compressors/guide vanes/supercritical carbon dioxide/Brayton cycle/flow behavior引用本文复制引用
基金项目
国家自然科学基金项目(52076114)
山东省自然科学基金项目(ZR2020ME168)
山东省泰山学者计划(tsqn201812073)
出版年
2024
国家科技期刊平台
NSTL
万方数据