基于DDES模拟的叶顶泄漏流与尾迹非定常干涉机理
收稿日期: 2022-11-29
修回日期: 2022-12-20
录用日期: 2023-02-06
网络出版日期: 2023-02-20
基金资助
国家重大科技专项(J2019-II-0008-0028);国家自然科学基金(52276031)
DDES analysis of unsteady characteristics of interaction between tip leakage flow and wake
Received date: 2022-11-29
Revised date: 2022-12-20
Accepted date: 2023-02-06
Online published: 2023-02-20
Supported by
National Major Science and Technology Project(J2019-II-0008-0028);National Natural Science Foundation of China(52276031)
叶顶泄漏流是涡轮叶片内部气动损失和非定常性的重要来源之一，其包含多个空间和时间尺度流场结构。采用延迟脱体涡高精度湍流模拟方法（DDES）研究了某高压涡轮动叶叶顶泄漏流，分析了泄漏涡结构及其非定常特性，进而研究了叶顶泄漏流与尾迹间的非定常干涉现象及其机制，最后基于非定常熵输运方程分解并研究了泄漏流区域的损失机制。研究发现：DDES方法可以精细捕捉泄漏流和尾迹区的多尺度流场结构及其相互干涉作用；泄漏流与尾迹间的相互干涉会导致尾迹涡轨迹发生明显偏移，并伴随着涡破碎现象的产生，具有很强的非定常效应；基于非定常熵输运方程的损失分析表明，涡破碎现象造成的损失在脉动损失中占比可达23.3%，是非常重要的损失来源之一。
李会 , 黄通 , 苏欣荣 , 袁新 . 基于DDES模拟的叶顶泄漏流与尾迹非定常干涉机理[J]. 航空学报, 2023 , 44(14) : 628325 -628325 . DOI: 10.7527/S1000-6893.2022.28325
Tip leakage flow containing multiple spatial and temporal scale flow field structures is one of the major sources of aerodynamic losses and unsteadiness in turbine. This study employs Delayed Detached Eddy Simulation （DDES） to simulate the tip leakage flow in a high-pressure turbine rotor. The structure and unsteady characteristics， as well as the unsteady interaction between the tip leakage flow and the wake are analyzed. Based on the unsteady entropy transport equation， the loss mechanism of the leakage flow zone is decomposed and studied. It is found that the DDES method can finely capture the multiscale flow field structure and mutual interference of the leakage flow and wake. The result shows that the interference between the leakage flow and the wake vortex can lead to a significant shift of the wake vortex trajectory， accompanied by the generation of vortex fragmentation with a strong unsteady effect. Based on the unsteady entropy transport equation， the loss caused by vortex fragmentation can account for 23.3% of the pulsation loss， becoming an important source of loss.
Key words： tip leakage flow; wake; unsteady interference; DDES; entropy generation
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