Gas foil bearings are often used in high-speed turbomachinery such as turboexpanders and turbochargers due to their merits over simple gas-lubricated bearings. The merits of gas foil bearings include their ability to tailor dynamic parameters such as stiffness and damping. Gas foil bearings usually have low clearance and operate at a high rotational speed, which eventually leads to velocity slip at the solid–fluid interface. This article investigates the effect of slip flow on various parameters of gas foil thrust bearings. A numerical model is formulated to predict pressure, film thickness and temperature distribution of helium lubricated gas foil thrust bearing at high rotating speed. The Reynolds equation is modified by assuming first-order slip coupled with the structural (compliant) and energy equation. The temperature-dependent viscosity and density of the fluid are also considered in the Reynolds equation to predict the thermohydrodynamic behaviour of gas foil thrust bearings. The numerical model thus developed uses a finite-difference method and the Newton–Raphson method to solve the Reynolds equation,whereas the successive over-relaxation method is used to solve the energy equation. Various performance parameters are compared for slip and no-slip conditions for gas foil thrust bearings. The results show a considerable difference between the two phenomena. Also, the conventional Reynolds equation tends to overestimate the load-carrying capacity.

气体箔轴承由于具有优于简单的气体润滑轴承的优点，因此经常用于诸如涡轮膨胀机和涡轮增压器的高速涡轮机械中。气箔轴承的优点包括能够调整动态参数（如刚度和阻尼）的能力。气箔轴承通常具有较小的游隙，并且在较高的转速下运行，最终导致固-液界面处的速度滑移。本文研究了滑流对气箔推力轴承各种参数的影响。建立了一个数值模型来预测氦润滑气箔推力轴承在高转速下的压力，膜厚和温度分布。雷诺方程是通过假设一阶滑移与结构（顺应性）和能量方程耦合来修改的。雷诺方程中还考虑了随温度变化的粘度和流体密度，以预测气箔推力轴承的热流体动力学行为。这样建立的数值模型使用有限差分法和牛顿-拉夫森法求解雷诺方程，而连续超松弛法则用于求解能量方程。比较了气膜推力轴承在滑动和不滑动条件下的各种性能参数。结果表明两种现象之间存在很大差异。而且，常规的雷诺方程倾向于高估负载能力。这样建立的数值模型使用有限差分法和牛顿-拉夫森法求解雷诺方程，而连续超松弛法则用于求解能量方程。比较了气膜推力轴承在滑动和不滑动条件下的各种性能参数。结果表明两种现象之间存在很大差异。而且，常规的雷诺方程倾向于高估负载能力。这样建立的数值模型使用有限差分法和牛顿-拉夫森法求解雷诺方程，而连续超松弛法则用于求解能量方程。比较了气膜推力轴承在滑动和不滑动条件下的各种性能参数。结果表明两种现象之间存在很大差异。而且，常规的雷诺方程倾向于高估负载能力。