涡轮叶顶间隙自适应控制的研究

发布时间：2018-01-31 10:55

  本文关键词： 自适应 叶顶喷气孔 间隙泄漏 喷气孔参数　出处：《推进技术》2017年09期 　论文类型：期刊论文

【摘要】：为了达到减小涡轮叶片叶顶间隙泄露的目的,应用数值模拟并辅之试验的方法对叶顶间隙泄漏流动形成机理、涡轮自适应叶顶喷气控制机理及其对间隙流动的控制作用进行了研究。在此基础上,着重研究了进口位置、出口位置、喷气孔直径等自适应叶顶喷气孔参数以及叶顶间隙大小,对叶顶喷气效果的影响规律。结果表明:自适应叶顶喷气孔进口位置对叶顶喷气性能影响不大;出口位置在叶顶中部,靠近压力面时,叶顶喷气效果最佳;喷气孔直径为2mm(d/H=4.8%相对叶高)时效果较好;叶顶间隙越大,叶顶喷气效果越差,当间隙取到2mm(t/H=4.8%相对叶高)时,叶顶喷气已经失去控制间隙泄漏的作用了。
[Abstract]:In order to reduce the leakage of tip clearance of turbine blade, the mechanism of leakage flow of tip clearance of turbine blade was studied by numerical simulation and experimental method. The mechanism of turbine adaptive blade top jet control and its control effect on clearance flow are studied. On this basis, the inlet position and outlet position are studied emphatically. The effect of the air vent diameter and the size of the blade tip clearance on the blade top jet effect is studied. The results show that the inlet position of the adaptive blade top jet hole has little effect on the blade top jet performance. When the outlet position is in the middle of the top of the leaf, when it is close to the pressure surface, the top of the blade has the best effect. The effect is better when the diameter of the jet hole is 2 mm / h / H = 4.8% relative to the leaf height. The bigger the tip clearance, the worse the effect of blade top ejection. When the gap reaches 2 mm / t / H (4.8% relative leaf height), the top blade jet has lost the function of controlling clearance leakage.
【作者单位】： 哈尔滨工程大学动力与能源工程学院;
【基金】：国家自然科学基金项目(51406039) 黑龙江省青年科学基金(QC2016059)
【分类号】：V233.7
【正文快照】： 1引言叶顶间隙泄漏流对涡轮性能有很大影响,比如堵塞通道主流、恶化叶顶换热情况,导致近叶顶出现脉动以及增加涡轮气动损失等。涡轮中三分之一以上的流动损失由叶顶间隙泄漏流引起的,很大程度上影响了涡轮效率[1]。叶顶泄漏流的危害还不仅仅在于造成做功损失,更重要的是泄漏流，

本文编号：1478902