Abstract
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 gas film pressure; contact pressure is approximately linearly related to mean gas pressure. Simulated test rig was built and experimental results show: high-pressure working gas leak to intermediate chamber through piston rings, and the pressure of intermediate chamber drops sharply at lowest pressure of circulation; piston ring wear increases when rotational speed or working pressure increase. The accuracy of numerical model was proved by experimental phenomena and test data.
Highlights
The Stirling engine is a piston engine with external heating
The Stirling engine is mainly composed of an external combustion system, a working fluid circulation system and a transmission system
Stirling engine piston ring relies on the pressure of the working gas to produce a sealing effect, which is used to isolate the high-pressure gas from different Stirling cycles
Summary
The Stirling engine is a piston engine with external heating It uses gas as a working medium and works in a closed regenerative cycle. Stirling engine piston ring relies on the pressure of the working gas to produce a sealing effect, which is used to isolate the high-pressure gas from different Stirling cycles. It operates under high-speed and high-load working conditions. The linear simplified force analysis of Stirling engine piston ring is as follows: P1 represents the pressure in the working chamber, P2 represents the pressure acting on the inner surface of the piston ring; P2 is approximately equal to P1. It is inferred that the piston ring-cylinder liner of the Stirling engine is a special form of friction, and it is necessary to carry out detailed research on friction and lubrication of Stirling engine piston ring
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