Erosion-cavitation dans les perçages de refoulement des pompes d'injection de diesels industriels

Erosion-Cavitation in drilling at the industrial diesel injection pumps backflow

¹ Service Technique Moteurs, S.E.M.T. Pielstick, Saint-Nazaire
² Service Projets Thermodynamiques, S.E.M.T. Pielstick, Saint-Denis

Abstract

This paper treats one of the difficulties of injection system for Diesel engines: the cavitation. It namely describes how SEMT Pielstick faces erosion-cavitation on running engines, how the source of erosion is understood and the way to avoid it. The lack of knowledge on cavitation fluid and on the kind of cavitation involved an important experimental stage to show the erosion mechanism. After this first stage, a two dimensional calculation of the jet subjected to cavitation including the vapor bubbles was performed. The goal was to be able to forecast the areas which were eroded with a permanent flow in a defined geometry. Finally some solutions to reduce the effect of the cavitation are described. The study of this problem exhibited great difficulties in measurement and an important need of predictive calculation on cavitation.