摘要
针对某化工厂DN100-PN63蒸汽放空阀在开度0~60%的振动噪声问题,基于分离涡算法和M9hring声类比理论,采用Fluent和Actran软件对开度为40%的阀门进行真实工况的流场和声场数值模拟分析,研究阀门内部流动情况及阀门内、外噪声分布情况,提出4种改进结构,并分别对其流场和声场进行深入的对比研究。结果表明:原结构阀门内部存在多处涡旋;阀内件和孔板的高马赫数(Ma>0.2)区域约占90%,且存在超音速流动区域,极可能产生较大的冲击波并产生激波啸叫;离阀门及管道1 m处的噪声达116 dB(A),具有宽频特性,并有明显的四极子声源特点;与原结构相比,改进后的4种阀内件对涡旋的消失起到了促进作用,具有明显的降噪效果。
Aiming at the vibration and noise problem of DN100-PN63 steam vent valve at the opening degree from 0 to 60% in a chemical plant,based on detached eddy simulation and M9hring acoustic analogy theory,Fluent and Actran softwares were used to numerically simulate the flow field and sound field of the valve with 40% opening degree in real working conditions,and the internal flow of the valve and the noise distribution inside and outside the valve were studied.Four improved structures were proposed and the flow field and sound field were studied in depth.The results show that there are several vortices inside the original valve;the high Mach number(Ma>0.2) area of valve internals and orifice plate accounts for about 90%,and there are supersonic flow areas,which is very likely to produce a large shock wave and shock noise;the noise of 1 m away from the valve and pipe reaches 116 dB(A),which has the characteristics of breedband frequency and obvious quadrupole sound source;compared with the original structure,the four improved valve internals promote the disappearance of vortex and have obvious noise reduction effect.
作者
刘柏圻
廖静
郝娇山
王伟波
杨恒虎
LIU Baiqi;LIAO Jing;HAO Jiaoshan;WANG Weibo;YANG Henghu(Control Valve Research Institute of Chongqing Chuanyi Automation Co.,Ltd.,Chongqing 400707,China;Chongqing Chuanyi Control Valve Co.,Ltd.,Chongqing 400707,China)
出处
《机床与液压》
北大核心
2024年第11期145-151,共7页
Machine Tool & Hydraulics
关键词
蒸汽放空阀
分离涡算法
声类比理论
数值模拟
气动噪声
steam vent valve
detached eddy simulation
acoustic analogy theory
numerical simulation
aerodynamic noise
