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Refinement of Engine In-Cycle Losses of Parasitic and Errant Dynamic Nature

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Shape of Bore
Treating the Cavitation Phenomenon
Cavitation at the exit of the ring-bore contact can affect the supply of the lubricant at the inlet meniscus during ring reversal at the dead centres. Depletion of meniscus reduces lubricant film thickness. As cavitation reduces the load carrying region, higher conjunctional pressures are encountered. A transient solution is required to capture the cavitation effect since steady state solution leads to erroneous estimation of the film thickness and pressure
Modelling ring-bore conjunction with cavitation boundary using Elrod solution shows a reduction in film thickness not predicted with the usual Reynolds approach.