To solve the practical problem of Stirling engine piston ring. numerical model on friction and lubrication were established based on average Reynolds equation theory. Numerical calculation results show: piston rings are in the mixed lubrication state which gas lubrication film and micro-convex body contact existing simultaneously; contact pressure is 2 orders of magnitude less than ga... https://parisnaturalfoodes.shop/product-category/wild-rose-day-cream/