机匣切向喷气角对涡轮动叶间隙流动的影响  

Influence of the Casing Tangential Air-injection Angles on the Turbine Blade Tip Clearance Flow

作　　者：牛茂升[1] 臧述升[1] 

机构地区：[1]上海交通大学机械与动力工程学院叶轮机械研究所,上海200240

出　　处：《热能动力工程》2010年第3期254-258,354,共6页Journal of Engineering for Thermal Energy and Power

基　　金：国家重点基础研究发展计划基金资助项目(2007CB210102)

摘　　要：机匣喷气已被证明是改善动叶流道内二次流分布,提高涡轮效率的有效措施之一。本研究采用数值模拟方法研究机匣切向喷气角度对间隙流动控制的影响。结果显示,当增大机匣切向喷气角时,由于喷气速度在切向上的分量减小,使得喷气孔流体在间隙内轴向上影响范围减小,最大降幅可达50%,导致机匣喷气对间隙流动的阻拦作用降低。同时由于切向角度增大使得上通道涡尺寸增加,涡核强度增大约11%,使得动叶出口截面上流动损失增大。考虑到喷气对动叶输出功的负作用,应当选择适当的切向喷气角度,以达到提高涡轮效率的目的。Casing air injection has been proven to be one of the effective measures for improving secondary flow distribution in rotor blade passages and enhancing turbine efficiency. By adopting a numerical simulation method,the authors have studied the influence of casing tangential air-injection angles on blade tip clearance flow control. It has been found that with an increase of the above-cited angle,the influence scope of the fluid outgoing from the air injection holes into the clearances along the axial directi...

关 键 词：间隙流动控制 切向喷气角度 间隙涡 通道涡 

分 类 号：TK472[动力工程及工程热物理—动力机械及工程]