带有自发射流的涡轮叶顶间隙流场PIV测量  

Measurement of Tip Clearance Flow with Spontaneous Tip Injection Using PIV Technology

作　　者：胡建军[1,2] 张铎[2] 李志显 马龙[2] 孔祥东[1] 

机构地区：[1]燕山大学机械工程学院,河北秦皇岛066004 [2]燕山大学建筑工程与力学学院,河北秦皇岛066004

出　　处：《动力工程学报》2016年第11期870-876,共7页Journal of Chinese Society of Power Engineering

基　　金：河北省自然科学基金资助项目(E2015203271);国家自然科学部主任基金资助项目(5160051215);燕山大学青年教师自主研究计划理工A类资助项目(14LGA014);国家重点基础研究发展计划973资助项目(2014CB046405)

摘　　要：为了探究叶尖射流对涡轮叶栅流场特性的影响，搭建了一个小尺度低速叶栅风洞实验台，利用粒子成像测速（PIV）技术对带有自发射流的涡轮叶顶间隙流场进行了直接测量，获得了低雷诺数（Re=6．46×103～3．23×104）下射流孔附近的流动图像及速度测量结果，展示了叶顶间隙内层流和紊流2种流态下自发射流与泄漏流的相互作用过程，揭示了低雷诺数工况下（涵盖层流到紊流的转捩）叶尖射流抑制泄漏流的作用机理及影响因素，并对叶尖射流尾迹中出现的类卡门涡街的涡分布现象进行了探讨．结果表明：叶尖射流的引入在泄漏流抑制方面取得一定收益，但同时也进一步加剧了叶顶间隙流动的复杂性．To investigate the influence of spontaneous tip injection （STI） on the turbine cascade flow, a small scale low-speed wind tunnel test rig was developed to directly measure the tip clearance flow field with spontaneous tip injection using PIV technology, so as to obtain the flow field adjacent to the injection hole at low Reynolds numbers （Re= 6.46 × 103-3.23 × 104 ） , present the interaction process between STI and tip leakage flow （TLF） under laminar and turbulence flow conditions in the tip clearance, reveal the mechanism using STI method to suppress the TLF at low Reynolds numbers （covering the transition process from laminar flow to turbulence flow）, and finally to analyze the phenomenon of vortex distribu- tion similar to the Karman vortex street （KVS） appearing in the wake of tip injection. Experimental re- suits show that the introduction of STI may reduce the tip leakage flow in a certain degree, which howev- er, would simultaneously intensify the complexity of the tip clearance flow.

关 键 词：叶顶间隙 泄漏流 叶尖射流 PIV 流场 

分 类 号：V231.3[航空宇航科学与技术—航空宇航推进理论与工程]