摘要
温控是土工离心机设计中的关键问题之一,温度超标将严重影响实验的准确性和安全性。当常规散热方式无法满足温控要求时,降低风阻功率成为温控的重要方法,氦气置换空气及降压均能降低风阻功率。本文对ZJU400 g•t离心机进行了仿真,基于雷诺运输方程和CFD模拟结合的方法对降压和氦置换对风阻功率的影响进行了研究。模拟结果显示:(1)常压下空气的模拟风阻功率和实测结果偏差<15%,验证了模拟的可靠性;(2)风阻功率与压力成指数(指数<1)关系;(3)相同压力下氦工质风阻功率约为空气的17%~19%。进一步研究表明风阻功率与有效运动黏度、速度空间分布和压力有关,并得到风阻功率随压力和氦置换变化的主要原因。
Temperature control is one of the key problems in the design of super-gravity centrifuge,excessive temperature will seriously affect the accuracy and safety of the experiment.When the conventional heat dissipation method cannot meet the requirements of temperature control,reducing wind resistance power becomes an important method for temperature control.Both helium replacement of air and pressure drop can reduce wind resistance power.In this paper,the ZJU400 g•t centrifuge is simulated,and the influences of pressure and helium replacement on wind resistance power are studied based on the combined method of Reynolds transport equation and CFD simulation.Simulation results show that:(1)The difference between the simulated wind resistance power and the measured result is<15%,which verifies the reliability of this simulation;(2)The relationship between the wind resistance power and the operating pressure is exponential(exponential<1);(3)Under the same operating pressure,the wind resistance power of helium as working medium is about 17%~19%of that of air working medium.Further study shows that the wind resistance power is related to the effective kinematic viscosity,velocity spatial distribution and pressure,and the main reasons for the variation of wind resistance power with pressure and helium replacement are obtained.
作者
郭轶楠
杨毅
蒋建群
余俊祥
王亚林
GUO Yinan;YANG Yi;JIANG Jianqun;YU Junxiang;WANG Yalin(Architectural Design&Research Institute of Zhejiang University Co.,Ltd.,Hangzhou 310028,China;Center for Balance Architecture,Zhejiang University,Hangzhou 310028,China;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China)
出处
《地震工程与工程振动》
CSCD
北大核心
2020年第6期197-206,共10页
Earthquake Engineering and Engineering Dynamics
基金
浙江省重点研发计划项目(2018C03045)。
关键词
土工离心机
CFD数值模拟
风阻功率
操作压力
氦工质
geotechnical centrifuge
CFD simulation
wind resistance power
operating pressure
helium working medium
