基于热流固耦合的双槽阶梯槽应力变形分析

Stress and Deformation Analysis of Double-groove Stepped Groove Based on Thermal-fluid-solid Coupling

目的获得双槽阶梯槽的干气密封性能。方法运用热流固耦合方法,对双槽阶梯槽、单螺旋槽密封动、静环进行变形与应力分析,得到在不同工况下2种槽型密封环的变形图和应力分布图,讨论不同工况对2种槽型密封环变形量和应力的影响规律。结果随压力的增加,单螺旋槽密封环最大变形量的增长率低于双槽阶梯槽,而双槽阶梯槽密封环最大应力值的增长率高于单螺旋槽。随转速的增加,2种槽型密封环的变形量均减小。在转速为25000 r/min时,双槽阶梯槽动环的最大变形量比单螺旋槽低13.7%。在转速变化范围内,单螺旋槽和双槽阶梯槽的最大应力值分别下降了8%、13.9%。随着转速的增加,相对应的2槽型密封环最大应力值的差值越大。结论双槽阶梯槽密封环最大变形量和最大应力的增长率均高于单螺旋槽,双槽阶梯槽密封环的变形量和最大应力值均小于单螺旋槽。这表明在高速工况下,双槽阶梯槽运行更稳定。

The work aims to obtain the dry gas sealing performance of double-groove stepped groove.The thermal-fluid-solid coupling was used to analyze the deformation and stress of the dynamic and static sealing rings with double-groove stepped groove and single spiral groove.The deformation maps and stress distribution maps of the sealing rings with two types of grooves were obtained under different working conditions.The effects of different working conditions on the deformation and stress of the sealing rings with two types of grooves were discussed.As the pressure increased,the growth rate of the maximum deformation of the sealing ring with single spiral groove was lower than that of sealing ring with double-groove stepped groove,while the growth rate of the maximum stress of the sealing ring with double-groove stepped groove was higher than that of sealing ring with single spiral groove.At 25000 r/min,the maximum deformation of dynamic ring with double-groove stepped groove was 13.7% lower than that of dynamic ring with single spiral groove.Within the range of rotation speed,the maximum stress of single spiral groove and double-groove stepped groove decreased by 8% and 13.9%,respectively.With the increase of rotation speed,the difference of the maximum stress between the sealing rings with two types of grooves increased.The growth rate of the maximum deformation and stress of the sealing ring with double-groove stepped groove is higher than that of sealing ring with single spiral groove.The deformation and maximum stress of the sealing ring with double-groove stepped groove are less than those of sealing ring with single spiral groove.The results show that the double-groove stepped groove runs more stably at high speed.