润滑与密封
潤滑與密封
윤활여밀봉
LUBRICATION ENGINEERING
2014年
10期
16-21
,共6页
陈汇龙%刘志斌%赵斌娟%左木子%吴强波%徐成
陳彙龍%劉誌斌%趙斌娟%左木子%吳彊波%徐成
진회룡%류지빈%조빈연%좌목자%오강파%서성
机械密封%表面粗糙度%微间隙%多尺度%动压效应
機械密封%錶麵粗糙度%微間隙%多呎度%動壓效應
궤계밀봉%표면조조도%미간극%다척도%동압효응
mechanical seals%surface roughness%micro channels%multiscale%dynamic effects
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。
為瞭研究錶麵粗糙度對多孔耑麵機械密封膜壓的影響，建立含粗糙元的矩形截麵輪廓激光加工多孔耑麵機械密封微間隙液膜多呎度的三維幾何模型和計算模型，採用有限體積法求解三維N-S方程，分析相對錶麵粗糙度、粗糙元密度、不同分佈位置對膜壓分佈的影響規律。研究錶明：錶麵粗糙元和微凹腔都能產生動壓效應；分佈在動環耑麵的粗糙元對靜環膜壓的影響較大，分佈在靜環耑麵的粗糙元對動壓效應的影響相對較小；隨著粗糙元密度的減小，動環上粗糙元的動壓效應增彊，影響區域將由動環錶麵沿膜厚方嚮擴大到靜環錶麵；較小或較大的相對錶麵粗糙度對靜環膜壓的影響相對較小，而中等的相對錶麵粗糙度，兼具較彊的動壓效應效果和較大的影響範圍，對靜環膜壓的影響相對較大，它使得微凹腔在靜環上形成的低壓區減弱甚至消失。
위료연구표면조조도대다공단면궤계밀봉막압적영향，건립함조조원적구형절면륜곽격광가공다공단면궤계밀봉미간극액막다척도적삼유궤하모형화계산모형，채용유한체적법구해삼유N-S방정，분석상대표면조조도、조조원밀도、불동분포위치대막압분포적영향규률。연구표명：표면조조원화미요강도능산생동압효응；분포재동배단면적조조원대정배막압적영향교대，분포재정배단면적조조원대동압효응적영향상대교소；수착조조원밀도적감소，동배상조조원적동압효응증강，영향구역장유동배표면연막후방향확대도정배표면；교소혹교대적상대표면조조도대정배막압적영향상대교소，이중등적상대표면조조도，겸구교강적동압효응효과화교대적영향범위，대정배막압적영향상대교대，타사득미요강재정배상형성적저압구감약심지소실。
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 u-nit density,the fluid dynamic effects in the rotational ring is enhanced,and the influence scope of dynamic effects is ex-tended from the rotational ring surface to the stationary ring surface in the film thickness direction.Smaller or larger rela-tive 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 station-ary ring generated by the micro pores.
