摘要
为揭示旋叶式压缩机排气阀片振动特性,建立阀片单质点模型。(1)研究排气工况、几何参数与阀片振动位移的关系,得到升程限制器改进结构;而后,建立改进阀片排气结构流固耦合模型,研究阀片流动特性;(2)基于流场湍流参数建立排气阀片宽频噪声模型,研究改进阀片噪声分布规律,借助旋叶式压缩机噪声实验台,对改进前后压缩机整机噪声进行测试。研究表明:改进阀片参数,有效提高了平贴时间,降低了阀片振动速度峰值;阀片工作中消气槽流场处存在负压区域,阀片关闭时排气孔处流场存在回流现象;排气结构气动噪声源主要集中在阀片与阀座发生撞击的表面和消气槽附近;改进后压缩机部分频域段降噪明显降低,后部场点噪声幅值降低最大达6%。
Here,to reveal vibration characteristics of exhaust valve plate of rotary vane compressor,a single mass point model of the valve plate was established,and relations among exhaust working conditions,geometric parameters and valve plate vibration displacement were studied,and the improved structure of lift limiter was obtained.Then,the fluid-structure interaction model of the improved valve exhaust structure was established to study valve flow characteristics.Furthermore,based on flow field turbulence parameters,the broadband noise model of exhaust valve was established to study noise distribution law of the improved valve.By means of a rotary vane compressor noise test platform,total noise of compressor before and after improving was tested.The results showed that improving valve plate parameters can effectively increase flat pasting time,and reduce vibration velocity peak-peak values of valve plate;there is a certain degree of negative pressure zone in flow field of degassing tank during valve plate operating,and there is a backflow phenomenon in flow field at exhaust hole during valve plate being closed;the aerodynamic noise source of exhaust structure is mainly concentrated on the surface where valve plate and valve seat collide and near degassing tank;after improving,noise levels in partial frequency bands of compressor are significantly reduced,and noise amplitude at rear field points deceases by 6%at most.
作者
罗胜曦
何泽银
陶平安
刘红梅
胡立志
孙世政
LUO Shengxi;HE Zeyin;TAO Ping’an;LIU Hongmei;HU Lizhi;SUN Shizheng(School of Mechatronic and Vehicle Engineering,Chongqing Jiao Tong University,Chongqing 400074,China;Chongqing Construction Automotive Systems Co,Ltd,Chongqing 400052,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2022年第19期266-273,共8页
Journal of Vibration and Shock
基金
重庆市技术创新与应用发展专项(cstc2019jscx-msxmX0038)
重庆市九龙区区科技计划项目(2020-02-001-Z)。
关键词
旋叶式压缩机
排气阀片
单质点模型
流固耦合
排气噪声
rotary vane compressor
exhaust valve plate
single mass point model
fluid-structure interaction
exhaust noise
