超高温气体调节阀热流固耦合数值分析

Numerical analysis of fluid-solid-heat coupling of ultra-high temperature gas regulating valve

针对传统超高温气体调节阀可调比范围小,特别是在小开度情况下密封面磨损较为严重,无法满足长寿命生产需求的问题,设计了一种夹套式水冷结构凸轮挠曲调节阀。采用ANSYS对该阀门的流场、温度场及应力场进行了热流固耦合计算,给出了阀腔内高温空气速度/温度分布、阀体温度分布、阀体应力分布等计算结果,同时评估了高温空气介质温度突变对阀体的冷热冲击影响,以及冷却水量对阀体温度分布的影响。仿真结果表明流道内最高流速可达550 m/s以上,且最高温度和最大应力区域主要位于阀座处;阀门两端给定-25,0,25 kN时,流道内应力变化不超过1 MPa;而通入450~1 320 K高温空气时,局部区域最大应力达140~180 MPa。通过优化冷却结构和冷却水用量,阀座最高温度不超过800 K,阀体外壁温度不超过314K,基本满足设计需求。

In view of the problem of small adjustable ratio range of the traditional ultra-high temperature gas regulating valve,especially the serious wear of the sealing surface under the condition of small opening,which can not meet the production demand of long life,a jacket water-cooled cam deflection regulating valve was designed.The fluid-solid-heat coupling was calculated for flow field,temperature field and stress field of the valve using ANSYS software.The calculation results of high temperature air velocity/temperature distribution,valve body temperature distribution and valve body stress distribution in the valve were given.At the same time,the impact of cold and hot shock with sudden change of temperature on valve body was evaluated.And the influence of cooling water quantity on temperature distribution of valve body was evaluated.The simulation results show that the maximum velocity can reach more than 550 m/s,and the maximum temperature and maximum stress area are mainly located at the valve seat;When loads of-25,0,25 kN are given at both ends of the valve,the stress change of the valve does not exceed 1 MPa;When 450~1 320 K high temperature air is introduced,the maximum stress in local area reaches 140~180 MPa.By optimizing the cooling structure and cooling water consumption,the maximum temperature of the valve seat does not exceed 800 K and the outer wall temperature of the valve body does not exceed 314 K,which basically meet the design requirements.