摘要
对不同预旋角度下进口导叶/叶轮的相干进行了非定常的数值模拟,讨论了动静相干效应的主要因素,分析了非定常效应对叶轮内流场结构的影响.结果表明,在较大的负预旋角度下,叶轮流动呈现出周期性;造成叶轮内非定常性的主要因素是上游进口导叶的尾迹区,尤其是大尺度分离涡团导致叶轮的进口流动不稳定.导叶尾流的影响只涉及到叶轮通道的一部分(约30%叶片长度),而叶轮的势影响范围从进口导叶尾缘到约20%左右叶片弧长处.叶轮叶片通过频率和叶片旋转频率同时影响着进口导叶内部的非定常流动.
Numerical simulations on the unsteady inlet guide vane（IGV）-impeller interaction were performed under different prewhirl angles.The main factors to IGV-impeller interaction were also discussed to analyze the influence of unsteady flow effect upon flow field of impeller.The results show that the impeller flows periodically under large negative prewhirl angle.In such case,the wake of IGV outlet,especially the large size vortice formed behind IGV,was the key factor to strong unsteady flow in the downstream impeller inlet.The unsteady influence of IGV wake involved only a part of impeller passage（about 30 percent of the blade chord）,and the potential repercussion of the impeller ranged from IGV trail edge to 20 percent of the chord.Both the passing frequency and rotating frequency of the blade have influence on the unsteady flow in IGV.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2007年第10期1715-1721,共7页
Journal of Aerospace Power
基金
国家自然科学基金资助(50576073)
西北工业大学青年科技创新基金
关键词
航空、航天推进系统
预旋角度
动静相干
尾流
叶片通过频率
叶片旋转频率
aerospace propulsion system
prewhirl angle
IGV-impeller interaction
wake
passing frequency of the blade
rotating frequency of the blade
