Cavitation erosion risk indicators for a thin gap within a diesel fuel pump

Abstract

Real industrial examples have been used to evaluate the viability of several cavitation erosion risk indicators (ERIs). Industry standard endurance tests resulted in non-critical cavitation erosion of a shoe and shoe-guide assembly in a high-pressure fuel pump. A design modification was made which eliminated the erosion. Transient CFD simulations of the two designs were run. The distribution and intensity of the resulting ERIs were evaluated against photographic evidence of erosion taken after endurance testing. Details of the component dynamics and the resulting cavitation formation and collapse are presented, along with an analysis of the ERIs for their potential usefulness. Of the 11 ERIs studied, two were found to be particularly good indicators, one of which is newly derived for this research. It is now anticipated that using these ERIs to guide product design and development will save considerable time and cost.

Influence of operational factors on the properties of working fluids of piston engines

“…The object of research was fluids containing substances that are part of multifunctional additives to coolant fluid of the internal combustion engine, which effectively inhibit cavitation and corrosion damage characteristic of elements of piston internal combustion engine systems [11][12][13][14], and prevent scale formation on the cooled surfaces and the additives themselves in working concentrations. Untreated distilled water was used as the base fluid for the tests.…”

Preferential cavitation and friction-induced heating of multi-component Diesel fuel surrogates up to 450MPa

“…For injection pressures in the range of 180MPa, the same simulated injector geometry was previously validated for predicting cavitation erosion damage 59 utilising the barotropic model. Cavitation erosion predictions have been also validated recently against measurements in a fuel pump 72 . These studies give confidence that the barotropic model is performing relatively well for similar cases as those studied here.…”

Modelling and prediction of cavitation erosion in GDi injectors operated with E100 fuel

“…Remarkably, the cavitation collapse process can result in light emission and temperatures in some cases of the order of 9000 K very localised in time and space [10,11]. Given the severity of cavitation collapse, plastic deformation and/or erosion of metallic surfaces causing performance drift and/or failure in multiple industrial scenarios such as in ship propellers [12], and high pressure fuel injection systems (including pumps [13,14] and injectors [15]) have been reported.…”

“…In addition in fuel injectors due to the moving needle valve, the sac volume pressure presents variations of the order of the injection pressure, which can obscure pressure peaks arising during the different injection phases [62]. Other investigations have successfully explored methods based on the potential energy available in cavities [63,49,64] or pressure time derivatives [65,14,13]. Finally, some works attempt to include also the material properties of the eroded metal such as that mean depth penetration rate (MDPR) [8,66] or the accumulated impact energy of [67].…”