涡轮叶顶泄漏涡非定常破碎特性分析

发布时间：2018-06-11 18:00

本文选题：涡轮 + 间隙泄漏涡　；参考：《推进技术》2016年02期

【摘要】：为了分析涡轮叶顶间隙泄漏涡的非定常破碎特性,采用数值方法联合标准k-ω两方程湍流模型求解非定常雷诺平均Navier-Stokes方程,通过施加非定常边界条件引入流场的非定常性,研究了涡轮叶顶间隙泄漏涡的非定常破碎过程,分析了流动非定常性影响泄漏涡破碎的深层次原因,探讨了泄漏涡破碎与损失的关联关系。结果表明:随着叶顶泄漏流动向下游发展,泄漏涡趋于不稳定,在叶片60%轴向弦长位置之后逆压区出现了破碎现象,涡破碎后的流动呈现出明显的非定常特征;尾迹引起的逆射流掠过泄漏涡的过程中与其发生强烈的相互作用,使得泄漏涡破碎位置在71%轴向弦长位置附近周期性前后摆动;同时,尾迹效应还使得泄漏涡破碎前后间隙外掺混损失也相应产生了周期性波动,并且涡破碎后间隙外掺混损失的波动幅度更大,意味着泄漏涡破碎是一种新的泄漏损失产生机制。
[Abstract]:In order to analyze the unsteady breakage characteristics of tip clearance leakage vortices of turbine blades, a numerical method combined with the standard k- 蠅 two-equation turbulence model is used to solve the unsteady Reynolds average Navier-Stokes equations. The unsteady flow field is introduced by applying unsteady boundary conditions. The unsteady breakage process of leakage vortex with tip clearance of turbine blade is studied. The deep causes of flow unsteady influence on leakage vortex breakage are analyzed and the relationship between leakage vortex breakage and loss is discussed. The results show that the leakage vortex tends to be unstable with the development of the tip leakage flow downstream, and the reverse pressure zone is broken after 60% axial chord length of the blade, and the flow after vortex breaking shows obvious unsteady characteristics. In the process of the wake induced inverse jet passing through the leakage vortex, there is strong interaction with it, which makes the breaking position of the leakage vortex periodically swing back and forth around 71% axial chord length position, at the same time, The wake effect also causes periodic fluctuation of the external mixing loss before and after the leakage vortex breaking, and the amplitude of the external mixing loss after the vortex breaking is larger, which means that the leakage vortex breakage is a new leakage loss generation mechanism.
【作者单位】：哈尔滨工程大学动力与能源工程学院;白城兵器试验中心;
【基金】：国家自然科学基金(51406039) 中央高校基本科研业务费专项基金(HEUCF140301)
【分类号】：O357.5

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