轮缘封严气流与上游导向器非定常干涉数值研究 -- 西北工业大学学报,2019,37(1):129-136
论文:2019,Vol:37,Issue(1):129-136
引用本文:
杨帆, 周莉, 王占学. 轮缘封严气流与上游导向器非定常干涉数值研究[J]. 西北工业大学学报
YANG Fan, ZHOU Li, WANG Zhanxue. Numerical Investigation of Unsteady Interaction between Rim Seal Flow and Upstream Vane[J]. Northwestern polytechnical university

轮缘封严气流与上游导向器非定常干涉数值研究
杨帆, 周莉, 王占学
西北工业大学 动力与能源学院, 陕西 西安 710072
摘要:
为了研究涡轮转静盘腔中的轮缘封严气流与主流的非定常干涉效应,在不同封严流量下对上游导向器的流场分布和非定常特性进行了数值模拟。结果表明,封严出流的堵塞作用引起吸力面后半段轮毂附近静压的升高和熵增的减小,以及导向器出口速度的降低。从无封严腔体到RI=1.7%,5%叶高吸力面静压系数最大增加了6%。封严出流造成横向压力梯度减小使得轮毂通道涡和轮毂尾缘脱落涡的强度减弱。不存在封严气流时,燃气入侵使得10%叶高以下范围非定常波动降低;存在封严气流时,来自燃气入侵和腔体进口的封严出流的耦合作用使得非定常波动不断减弱。
关键词:    腔体    导向器    入侵    侵出    非定常   
Numerical Investigation of Unsteady Interaction between Rim Seal Flow and Upstream Vane
YANG Fan, ZHOU Li, WANG Zhanxue
School of Power and Energy, Northwestern Polytechnical University, Xi'an 710072, China
Abstract:
To investigate unsteady interaction mechanism between the rim seal flow in turbine stator-rotor cavity and main flow, detailed unsteady numerical simulations of the flow field and unsteady characteristic of the vane were conducted under different rim seal mass flow rate. The results show the blockage effect resulting from the egress flow leads to the pressure to increase and static entropy to reduce on the latter half of suction side near the hub. From the case without a cavity to RI=1.7%, at 5% span, the maximum pressure coefficient increase on the suction side reaches 6%. Moreover, the blockage effect causes the velocity to decrease at vane exit. Furthermore, the rim seal flow results in the decrease in lateral pressure gradient, causing the strength of hub passage vortex and hub trailing shedding vortex to reduce. Without rim seal flow, the ingress flow contributes to decreasing unsteady fluctuation from the hub to 10% span. When there is rim seal flow, unsteady fluctuation continues to reduce due to coupling effects of the egress flow from the ingress and the egress flow form the cavity inlet.
Key words:    cavity    vane    ingress    egress    unsteady   
收稿日期: 2018-03-04     修回日期:
DOI: 10.1051/jnwpu/20193710129
基金项目: 国家自然科学基金(51876176,51576163)资助
通讯作者:     Email:
作者简介: 杨帆(1991-),西北工业大学博士研究生,主要从事叶轮机械气动热力学研究。
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