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Understanding how pump leakage can be predicted and minimized is an important aspect of pump design for subsequent improvements in pump performance. The Gerotor pump can have leakage rates that significantly affect performance and overall efficiency. Simulations were conducted on a Gerotor pump incorporating 1) a CFD code, CFD-ACE+ with a proven cavitation model and 2) a coupled structural solver to determine deflection of the cover plate in the pump assembly due to variation in internal pressure profiles during operation. The computed results (pressure, cavitation and deflection) show trends similar to that seen in experiments and a quantitative comparison is presented.

A laboratory method has been developed to rank the scuff resistance of piston ring coatings. This method employs a standard wear test apparatus with a specially designed sample holder. Scuff resistance of electrolytic chrome, thermal spray and physical vapor deposition (PVD) face coatings have been examined. Based on this method, examined PVD coatings produced the highest scuff resistance of all the tested face coatings.