摘要
在机械密封端面排布不同方向角的椭圆形微孔,对开启力和泄漏率的影响规律不一致,而且在不同工况下,设计者对开启力和泄漏率的需求也不一样,所以应采用双目标评价模型客观评价微孔排布对密封性能的影响。基于Fluent多相流空化模型,建立不同微孔排布方式时的密封间隙流体的三维数值计算模型,研究不同工况下的微孔排布方式对泄漏率和开启力2个密封性能参数的影响,并分别对泄漏率和开启力进行单目标评分;采用加权平均的方法,构造泄漏率和开启力为目标的双目标评价模型,并分析得到不同权重下微孔的最佳排布方式。结果表明:微孔排布方式对泄漏量和开启力的影响规律不一致,泄漏率随着内径侧P型微孔(方向角为45°微孔)数目增加而减小,开启力则在5N5P(即外径侧排布有5个方向角为-45°的N型微孔,内径侧排布有5个P型微孔)排布时取得极大值;综合考虑不同方向角的椭圆形微孔排布对开启力和泄漏率的影响,获得最佳排布方式在5N5P和0N10P之间,较高转速和低压差时,内径侧P型孔数可以偏少,高压差或者设计者更看重泄漏率时,内径侧P型孔数应该偏多。
The arrangements of elliptical micro-pores with different orientation angles on the mechanical seal face have different impact on the opening force and leakage rate.The design demands for the opening force and leakage rate are also different under different working conditions.Therefore,the double-objective evaluation model should be used to evaluate the influence of micro-pore arrangements on the sealing performance.3-D numerical model of the seal fluid under different micro-pore arrangements was developed based on multi-phase flow cavitation model in Fluent to study the influence of micro-pore arrangements on the sealing performance.The leakage rate and the opening force are scored separately.A dual-objective evaluation model based on weighted average method was formulated,which balances the leakage rate and opening force.The arrangements of micro-pore were optimized at different weight factors for suitable arrangement selection of elliptical micro-pore under a certain working condition.The results show that the arrangements of micro-pore have different impacts on the leakage rate and the opening force.The leakage rate is decreased when the number of micro-pore with 45° orientation angle (P-type micro-pore) near the inner diameter is increased.The opening force is the maximal when the number of micro-pore with -45°orientation angle(N-type micro-pore)near the outer diameter is 5,and the number of P-type micro-pore near the inner diameter is 5.This arrangement is named as 5N5P.When the leakage rate and opening force are both considered,the arrangements from 5N5P to 0N10P are preferred.At the same time,the number of P-type micro-pore near the inner diameter should be decreased when the speed is high or the pressure difference is low,and should be increased when the pressure difference is high or the low leakage rate is desired.
作者
战琳月
吉华
王天豪
李倩
冯东林
ZHAN Linyue;JI Hua;WANG Tianhao;LI Qian;FENG Donglin(School of Chemical Engineering,Sichuan University,Chengdu Sichuan 610065,China)
出处
《润滑与密封》
CAS
CSCD
北大核心
2019年第10期139-143,共5页
Lubrication Engineering
关键词
椭圆微孔排布
泄漏率
开启力
机械密封
elliptical micro-pore arrangement
leakage rate
opening force
mechanical seal
