CAJ | 학술논문

针对接触式机械密封普遍存在的渗漏现象，考虑到流体在多孔介质中的流动和在密封端面间的流动具有相似特征，基于多孔介质模型建立密封端面间渗流模型，通过对动量方程和连续性方程的推导，得到适用于密封端面间流体流动的控制方程，提出一种密封端面间泄漏率的解析计算新方法，并与COMSOL数值模拟得到的泄漏率进行对比分析；研究孔隙率、端面表面粗糙度、膜厚、密封介质压力和弹簧比压对静压泄漏特性的影响规律。结果表明，泄漏率随孔隙率、端面表面粗糙度、膜厚和密封介质压力的增大而增大，随弹簧比压的增大而减小，解析计算结果和数值模拟结果的变化趋势基本一致，证明该解析法计算泄漏率具有实用性和可行性。
침대접촉식궤계밀봉보편존재적삼루현상，고필도류체재다공개질중적류동화재밀봉단면간적류동구유상사특정，기우다공개질모형건립밀봉단면간삼류모형，통과대동량방정화련속성방정적추도，득도괄용우밀봉단면간류체류동적공제방정，제출일충밀봉단면간설루솔적해석계산신방법，병여COMSOL수치모의득도적설루솔진행대비분석；연구공극솔、단면표면조조도、막후、밀봉개질압력화탄황비압대정압설루특성적영향규률。결과표명，설루솔수공극솔、단면표면조조도、막후화밀봉개질압력적증대이증대，수탄황비압적증대이감소，해석계산결과화수치모의결과적변화추세기본일치，증명해해석법계산설루솔구유실용성화가행성。
As to the leak phenomenon commonly happened in the contacting mechanical seal,considering the similarity between the fluid flow in porous media and the seal gap of the mechanical seal end face,the model of the percolation flow between mechanical end faces was established based on the porous media model.By deriving the momentum equation and continuity equation,the governing equation is deduced,which is suitable for describing the fluid flow of mechanical end face.A new analytical solution evaluating the leakage rate of the mechanical end face was introduced.The calculated results were compared with ones obtained by COMSOL.The effect of porosity,roughness,film thickness,seal pressure and spring pressure on leakage performance was analyzed.The results show that the leakage rate is increased with the increase of po?rosity,roughness,film thickness and the sealing pressure,and deceased with the increase of the spring pressure.The ob?tained analytical results show the same trend with the numerical results,which verifies that the current analytical method is practical and feasible.