表面粗糙度对多孔端面机械密封膜压的影响  

Effect of Surface Roughness on Fluid Film Pressure of Laser Surface Textured Mechanical Seal

作　　者：陈汇龙[1] 刘志斌[1] 赵斌娟[1] 左木子[1] 吴强波 徐成[1] 

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013

出　　处：《润滑与密封》2014年第10期16-21,共6页Lubrication Engineering

基　　金：国家自然科学基金项目(51279067);航空科学基金项目(201328R3001)

摘　　要：为了研究表面粗糙度对多孔端面机械密封膜压的影响,建立含粗糙元的矩形截面轮廓激光加工多孔端面机械密封微间隙液膜多尺度的三维几何模型和计算模型,采用有限体积法求解三维N-S方程,分析相对表面粗糙度、粗糙元密度、不同分布位置对膜压分布的影响规律。研究表明:表面粗糙元和微凹腔都能产生动压效应;分布在动环端面的粗糙元对静环膜压的影响较大,分布在静环端面的粗糙元对动压效应的影响相对较小;随着粗糙元密度的减小,动环上粗糙元的动压效应增强,影响区域将由动环表面沿膜厚方向扩大到静环表面;较小或较大的相对表面粗糙度对静环膜压的影响相对较小,而中等的相对表面粗糙度,兼具较强的动压效应效果和较大的影响范围,对静环膜压的影响相对较大,它使得微凹腔在静环上形成的低压区减弱甚至消失。A multiscale geometric and computational model containing roughness unit was developed to study the effect of surface roughness on the fluid film pressure in microchannels of mechanical seals with a laser-textured porous seal face. By solving the N-S equation with numerical simulation methods of FLUNT, the effect of the fluid film pressure distribution by the height, distance and distribution position of roughness was investigated. The results indicate that both surface roughness and micro pores have the fluid dynamic effects. Roughness unit located in the rotational ring has more obvious influence on the fluid dynamic effects of the micro pores than that in the stationary ring. With the decrease of roughness unit density, the fluid dynamic effects in the rotational ring is enhanced, and the influence scope of dynamic effects is extended from the rotational ring surface to the stationary ring surface in the film thickness direction. Smaller or larger relative surface roughness has less influence on the film pressure distribution of stationary ring, but middling relative surface roughness will greatly affect the film pressure distribution of stationary ring, because it generates relative stronger dynamic effects and has larger influence scope, resulting in the reduction and even disappear of the low pressure area in the stationary ring generated by the micro pores.

关 键 词：机械密封 表面粗糙度 微间隙 多尺度 动压效应 

分 类 号：TH136[机械工程—机械制造及自动化]