阻旋栅对梳齿密封动静特性影响研究

阻旋栅可改变密封进口流体周向流动与进口预旋，是提高系统稳定性的主要方法之一. 本文作者应用计算流体力学方法研究了阻旋栅几何参数对梳齿密封动静特性的影响，计算分析了阻旋栅在不同长度、间隙、周向个数及不同进口预旋比下密封流场分布与动力特性系数，并与无阻旋栅梳齿密封进行对比. 研究表明：阻旋栅能够有效抑制密封进口周向流动、降低密封腔室周向压力；随着阻旋栅周向个数与阻旋栅间隙的减小，其抑制效果增强，阻旋栅长度的增加对周向速度影响则越来越小；提高预旋比将使密封内流体周向速度增加. 与传统梳齿密封相比，具有阻旋栅的梳齿密封直接阻尼增加，交叉刚度降低，进而有效阻尼提高. 阻旋栅间隙s=0.20 mm、长度l=3.25 mm、数量n=90时密封有效阻尼较大，系统稳定性最好.Anti-swirl grids, which can alter the circumferential flow and inlet pre-swirl of the fluid at the seal inlet, are one of the primary methods to enhance system stability. In this study, the authors employed Computational Fluid Dynamics (CFD) to investigate the effects of anti-swirl grid geometric parameters on the static and dynamic characteristics of labyrinth seals. They calculated and analyzed the seal flow field distribution and dynamic characteristic coefficients under different grid lengths, clearances, circumferential quantities, and inlet pre-swirl ratios, and made comparisons with labyrinth seals without anti-swirl grids. The results show that anti-swirl grids can effectively suppress the circumferential flow at the seal inlet and reduce the circumferential pressure in the seal chambers. As the circumferential quantity and clearance of the anti-swirl grids decrease, their suppression effect is enhanced, while the impact of increasing grid length on circumferential velocity becomes progressively weaker. Additionally, increasing the pre-swirl ratio will elevate the circumferential velocity of the fluid inside the seal. Compared with conventional labyrinth seals, labyrinth seals equipped with anti-swirl grids exhibit increased direct damping and reduced cross-stiffness, thereby improving the effective damping. When the anti-swirl grid clearance s=0.20 mm, length l=3.25 mm, and quantity n=90, the seal has a relatively large effective damping and the best system stability.

搜集汇总

背景与挑战

背景概述

该数据集研究阻旋栅对梳齿密封动静特性的影响，通过计算流体力学方法分析几何参数（如长度、间隙、周向个数）和进口预旋比，发现阻旋栅能抑制周向流动、提高有效阻尼，从而增强系统稳定性，并对比了与传统密封的性能差异。