TRANSIENT NUMERICAL ASSESSMENT OF RACE CAR DRY-SUMP OIL UNDER DIFFERENT MANEUVERS

CORZO SANTIAGO; NIGRO NORBERTO; RISSO JOSE; RAMAJO DAMIAN

La Plata

Congreso; ENIEF 2017; 2017

Universidad Nacional de La Plata

A numerical assessment of a dry-sump oil system was performed by Computational FluidDynamics (CFD). Unlike conventional cars, race cars are subjected to high accelerations that induceoil sloshing. Hence, dry-sump oil systems are required to collect the oil outside of the engine prior tobe pumped inside of it again. To avoid engine malfunctions, the dry-sump must guaranteecontinuously oil suction in every maneuver. To perform such simulations, the model was subjected todifferent car maneuvers extracted from data acquisition available from real race car, showing thatsingle and combined maneuvers, such as acceleration, braking and turnings can induce downward,upward and lateral accelerations higher than 2g during several seconds. Therefore, four differentsingle maneuvers (acceleration, deceleration, turn right and turn left) as well as a set of contaminatedmaneuvers (braking and turning) were studied. Simulations were achieved by mean of the Volume ofFluid Method (VOF) for a air-oil system. The influence of the turbulence modeling was alsoinvestigated. First a forerunner design was analyzed and both the race car tests and CFD simulationsshowed that for the most extreme maneuvers (pure braking and combined with braking with turningright) the original design failed before the end of the maneuvers by air suction in the pump inlet. Inconsequence, the dry-sump was redesigned and assessed under these extreme conditions until toensure stable oil aspiration.