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。本文采用延迟脱体涡高精度湍流模拟方法（Delayed Detached Eddy Simulation，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理，并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理。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；其次，本文结果表明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。

Tip leakage flow, which contains multiple spatial and temporal scale flow field structures, is one of the most im-portant sources of aerodynamic losses and unsteady in turbine. In this paper, DDES, Delayed Detached Eddy Sim-ulation, is used to simulate the tip leakage flow in a high-pressure turbine rotor. The structure and unsteady charac-teristics, as well as the unsteady influences between tip leakage flow and wake are analyzed. Based on the un-steady 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; secondly, the result of this paper 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 phenomenon, which has 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, which is a very important source of loss.