流体静压型指尖密封数值仿真分析

A Numerical Simulation Analysis of Hydrostatic Fingertip Seals

在分析接触型指尖密封和流体动压型指尖密封优缺点的基础上,提出了流体静压型指尖密封,并以此为研究对象,建立了流体静压型指尖密封流固耦合分析的数学模型和计算方法。针对流体静压型指尖密封泄漏和变形的主要影响因素,进行了数值计算和分析,计算结果表明:流体静压型指尖密封具有小变形和低泄漏的优点;密封间隙是影响泄漏的主要因素,并且沿周向泄漏是主要泄漏通道,间隙越小,沿周向泄漏越明显;压差一定时,间隙越小,静压靴的变形和应力越大,间隙一定时,压差越大,静压靴的变形和应力也越大。

On the basis of analyzing advantages and disadvantages of contact type fingertip seals and hydrodynamic type ones,the authors have presented a hydrostatic fingertip seal and with this type of seal serving as an object of study,established a mathematical model and calculation method for analyzing fluid-solid interaction in the hydrostatic fingertip seals.A numerical calculation and analysis were conducted by taking account of the main factors influencing the leakage and deformation of the above-mentioned seals.The calculation results indicate that the above-mentioned seals enjoy such merits as a small deformation and low leakage. Seal clearance is a main factor influencing the leakage with the circumferential leakage accounting for a major one.The smaller the clearance,the more conspicuous the circumferential leakage.When the pressure difference is constant,the smaller the clearance,the greater the deformation and stress of the hydrostatic pad.When the clearance is constant,the bigger the pressure difference,the greater the deformation and stress of the hydrostatic pad.