不同约束情况下双矩形断面的涡振性能分析

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (10) : 141-147.

论文

不同约束情况下双矩形断面的涡振性能分析

马凯，胡传新，周志勇

作者信息 +

Research on suppression method for circumferential flow and fluid-induced vibration of blade tip seal

MA Kai ， HU Chuanxin ， ZHOU Zhiyong

Author information +

文章历史 +

摘要

双矩形断面间存在显著的气动干扰效应。本文通过开展一系列节段模型测振和动态测压风洞试验研究宽高比为5:1的双矩形断面的涡振性能。通过测振试验得到上、下游断面均固定、仅上游断面固定、仅下游断面固定和两幅断面均自由4种情况下双矩形断面的涡振响应。并从平均风压系数分布、脉动风压系数分布、分布涡激气动力与整体涡激气动力的相关系数、分布涡激气动力的贡献系数以及卓越频率处的涡激气动力系数幅值等时域和频域统计特性分析了双矩形断面的涡振机理。结果表明两幅断面均自由时上游断面的涡振响应相比下游断面固定时有所减小，而下游断面的涡振响应相比上游断面固定情况下显著增大。固定与否对于下游断面竖弯和扭转涡振影响相比对于上游断面更加显著。双矩形断面迎风面和背风面分布涡激气动力对整体涡激气动力的的贡献较小，可以忽略其影响。上游断面下风侧区域以及下游断面上风侧区域的分布涡激气动力对整体涡激气动力的影响从相关系数、贡献系数以及卓越频率处的涡激气动力系数幅值等角度来看均较为显著。总体而言不同约束情况下统计参量分布较为类似，但数值上的差异不可忽略。

Abstract

There is significant aerodynamic interference between twin rectangular cylinders. A series of sectional model dynamic tests and pressure measurements were carried out to investigate the vortex-induced vibration (VIV) performance of twin rectangular cylinders with an aspect ratio of 5:1. Four cases of restraint conditions were considered, that is (1) both cylinders are restrained (Case 1); (2) the upstream cylinder (UC) is restrained while the downstream cylinder (UC) is free to vibrate (Case 2); (3) UC is free to vibrate while DC is restrained (Case 3) and (4) both cylinders are free to vibrate (Case 4). The analyses were performed based on VIV responses as well as mean and fluctuating pressure coefficient distributions. Additionally, the time and frequency domain statistical parameters like correlation and contribution coefficients between distributed and general vortex excited forces (VEFs) and VEF coefficients amplitudes at predominant frequencies were calculated to investigate the VIV mechanism of the cylinders with different restraint conditions. The results indicate that the VIV response of UC decreases for the case of Case 4 as compared with Case 2, the response of the DC increases significantly for Case 4 compared with Case 3. The effect of restraint conditions is more pronounced for DC than UC. The influence of the distributed VEFs on the windward and leeward surfaces of the cylinders to the general VEFs is comparatively minor, and the contribution can be neglected. However, the contribution of the local VEFs in the region of the trailing face of UC and the leading face of DC is significant from the view of the time and frequency-domain statistical characteristics. Generally, the distributions of these statistical parameters are similar for different restraint conditions, while the discrepancy in quantity could not be neglected.

导出引用

马凯，胡传新，周志勇. 不同约束情况下双矩形断面的涡振性能分析[J]. 振动与冲击, 2020, 39(10): 141-147

MA Kai,HU Chuanxin,ZHOU Zhiyong. Research on suppression method for circumferential flow and fluid-induced vibration of blade tip seal[J]. Journal of Vibration and Shock, 2020, 39(10): 141-147

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