W型封严环表面粗糙度对间隙泄漏流动的影响

金属封严环密封结构的泄漏是影响发动机金属封严环间隙泄漏通道内气体流动的因素之一。本文采用有限元分析软件建立不同表面粗糙度下的泄漏通道模型；采用CFD 技术对不同结构的间隙内流体流动进行数值模拟，研究表面粗糙度对泄漏流动的影响；计算封严环的泄漏率，通过密封试验验证计算结果的正确性。结果表明：气体在泄漏通道内受到表面粗糙度的影响，靠近粗糙壁面处产生明显的回流现象，降低了通道内流体的泄漏流速；在接触应力不变的条件下，密封间隙的泄漏量随表面粗糙度的增大而增大，提高封严环的加工精度能够降低表面粗糙度从而增强其密封性能。

The Effect of Rough Surface Characteristics of W-shaped Sealing Ring on Leakage

In order to study the influence of rough surface characteristics on the leakage of the metal seal ring gap, a mathematical model of three-dimensional rough surface was established according to mathematical formulas, a micro rough surface was established with surface roughness as an evaluation index, and a leakage channel model was established after contact calculation using finite element method. , Using CFD technology to simulate and analyze the flow field inside the gap of different structures, get the flow field distribution and velocity distribution, and calculate the leakage rate of the sealing gap. The results show that as the height of the sealing gap decreases, the surface roughness value decreases, and the pressure difference between the inner and outer chambers decreases, the leakage rate of the sealing system gradually decreases.