摘要
为了深入掌握雷诺数对低压涡轮端区流动的影响,采用Transition SST转捩模型,对雷诺数为0.6×10^(5)~3.0×10^(5)4种工况下的低压涡轮流场进行数值模拟。结果表明,采取的数值模拟方法能较准确的描述低压涡轮内部流动,在低雷诺数条件下,吸力面后部附面层易发生分离,且分离泡尺寸较大。随雷诺数的降低,叶栅出口截面的总压损失逐渐增加,损失平均值及高损失区面积的增加幅度均呈现非线性增长趋势。吸力面后部附面层分离区是低能流体聚集区,是流道内总压损失迅速上升的主要原因。通道涡流出流道后继续发展,与尾迹旋涡共同构成了叶栅下游区域损失持续增长的主要来源。
In order to further understand the influence of Reynolds number on the low-pressure turbine endwall flow,the Transition SST turbulence model was adopted to conduct numerical simulation with four Reynolds number conditions ranging from 0.6×10^(5) to 3.0×10^(5).The results showed that the numerical simulation method could accurately describe the flow in the low-pressure turbine.In the condition of low Reynolds number,the boundary layer separation at the rear part of the suction surface was easy to occur,and the size of the separation bubble was large.With the decrease of Reynolds number,the total pressure loss at the outlet section increased gradually.The increase amplitude of the average loss and the area of the high loss zone both showed a nonlinear growth trend.The separation zone at the rear part of the suction surface was the gathering zone of low-energy fluid,which was the main reason for the rapid increase of total pressure loss in the flow passage.Passage vortex continued to develop after leaving the flow passage,and constituted the main source of continuous increase of loss in downstream region of cascade with vortices in the wake zone.
作者
岳隆
王云飞
宋彦萍
陈浮
YUE Long;WANG Yunfei;SONG Yanping;CHEN Fu(School of Transportation and Vehicle Engineering,Shandong University of Technology,Zibo 255000,Shandong Province,China;School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,Heilongjiang Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2022年第3期1043-1051,共9页
Proceedings of the CSEE
基金
山东省自然科学基金青年项目(ZR2020QE190)
国家自然科学基金青年科学基金项目(51906243)。
关键词
低压涡轮
雷诺数
端区流动
附面层分离
总压损失
low-pressure turbine
Reynolds number
flow of end-zone
boundary layer separation
total pressure loss
作者简介
岳隆(1997),男,硕士研究生在读,主要研究方向为叶轮机械内部流场演化机制,yuelongyx@163.com;通信作者:王云飞(1988),男,工学博士,讲师,主要从事叶轮机械非定常流场时空演化机制、附面层分离转捩复杂流动机理及流动控制策略等方面的研究工作,wangyunfei@sdut.edu.cn。
