Abstract
The paper describes a finite element study of laminar flow of oil through a hydraulic pressure-relief valve of the differential-angle type used in a variable compression ratio piston of an internal combustion engine. The model simulates an experimental setup used to obtain the performance characteristics of the valve under steady-state conditions. The velocity and pressure distributions through the valve and the magnitude of the lift forces on the plunger are obtained under a constant inlet pressure condition for various plunger lifts. Comparisons are made with the available experimental and analytical data. The details of the flow through the valve are predicted with a good degree of accuracy. The results provided an improved understanding of the way in which opening forces on the valve plunger are generated at various plunger lifts and are thus helpful to the design process. The complex flow fields generated resulted in the formation of recirculation zones and modified the minimum flow areas, thus affecting the pressure distribution and the force on the plunger.
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