间隙高度对自发射流抑制叶尖泄漏的影响

胡建军; 孔祥东; 徐进良

间隙高度对自发射流抑制叶尖泄漏的影响

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
3.
华北电力大学可再生能源学院新能源与可再生能源北京市重点实验室, 北京 102206

基金项目: 河北省自然科学基金青年科学基金(E2011203094);国家重点基础研究发展计划(2011CB710703)

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出版历程
- 收稿日期: 2012-07-11
- 刊出日期: 2013-07-28

Effect of clearance height on tip leakage reduced by spontaneous tip injection

1.
School of Mechanical Engineering, Yanshan University, Qinhuangdao Hebei 066004, China
2.
School of Civil Engineering and Mechanics, Yanshan University, Qinhuangdao Hebei 066004, China
3.
Beijing Key Laboratory of New and Renewable Energy, School of Renewable Energy, North China Electric Power University, Beijing 102206, China

摘要

摘要: 通过数值求解三维定常黏性雷诺时均N-S方程,获得了单孔叶尖自发射流条件下不同叶顶间隙的叶栅流场,对比分析了间隙高度对自发射流与叶尖泄漏流相互作用特性、叶尖泄漏流量以及叶片载荷的影响.结果表明:当叶顶间隙高度为1mm(t/H=0.5%)时,自发射流对泄漏流有明显的阻挡作用,泄漏流量比减少0.06%,同时叶片载荷增加1.39%.当叶顶间隙高度增大到4mm(t/H=2%)时,自发射流的阻挡作用及对叶片载荷的增加作用基本消失;减小间隙高度可以有效提高自发射流的控制效果,同时降低因分离造成的流动损失;自发射流的存在显著改变了间隙流场分布及叶尖吸力面附近静压系数分布,计算发现当泄漏流绕自发射流流过时,下游流场出现类似卡门涡街的涡分布现象.
- 叶尖泄漏流 /
- 自发射流 /
- 间隙高度 /
- 数值模拟 /
- 控制效果
Abstract: The steady cascade flow field with different tip clearance height was obtained by numerically solving three-dimensional Reynolds-averaged N-S equations(RANS)and energy equations under the condition of single-hole spontaneous tip injection.The influences of clearance height on the interaction characteristics of the spontaneous injection with the tip leakage flow,the mass flow rate of leakage flow and the blade load were analyzed.The results show that the spontaneous jet has significant blocking effect on the leakage flow, the leakage ratio decreases by 0.06% with 1mm(t/H=0.5%) tip clearance,and meanwhile the blade load increases by 1.39%.The blocking effect decays with the increasing clearance height and can be ignored when the clearance height rises to 4 mm (t/H=2%);decreasing clearance height can effectively improve the controlling effect of spontaneous jet on leakage flow and reduce the flow losses caused by flow separation;the presence of spontaneous tip injection significantly changes the flow field of tip gap and the distribution of static pressure coefficient near the suction.The calculation results show that a vortex similar to the Karman vortex street appears downstream the jet flow when the leakage flow moves around the spontaneous jet.
- tip leakage flow /
- spontaneous tip injection /
- clearance height /
- numerical simulation /
- control effect

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参考文献(15)

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