基于耗散函数的叶顶泄漏流动非定常数值模拟

更进一步的改善间隙泄漏流动需要对其复杂的流动结构作深入的认识，若不能给出间隙泄漏流动影响更真实的表述将导致对其研究无法进行。为了更深入的认识涡轮叶栅流动粘性耗散的细节及分布，作者采用商用N-S求解器对具有动叶顶部间隙的涡轮级非定常流场进行了数值模拟和研究。本文引入耗散函数对间隙泄漏流动的粘性耗散进行评估，这种方法是对粘性影响带来的粘性耗散的最简单也是最直接模拟和计算方法。

Unsteady Simulation of Tip Leakage Flow Based on Dissipation Function

Further improvements of flow in tip clearance demand a better understanding of its complex structure and this would not be possible if we are not able to provide an interpretative or a more realistic presentation of its main effects.To do so,a commercial N-S solver has been employed for simulation and investigation of the unsteady flow field inside the tip clearance of a turbine rotor.The main objective of this paper is to introduce direct implementation of dissipation function for viscous loss assessment in tip leakage flow.This idea seems to be the simplest and at the same time,the most straightforward approach to simulate and calculate the viscous loss caused by viscous effects.