Investigation on the Effect of the Cooling Jet Impacts on the Moving Piston on Produced Oil Droplets Using a Motored Engine

Ehteram, M.A.; Basirat Tabrizi, H.; Ahmadi, M.; Hosseini, S.V.; Mirsalim, S.M.

Investigation on the Effect of the Cooling Jet Impacts on the Moving Piston on Produced Oil Droplets Using a Motored Engine

Authors

M.A. Ehteram

H. Basirat Tabrizi

M. Ahmadi

S.V. Hosseini

S.M. Mirsalim

Abstract

This study, investigate on the effects of piston cooling jet on the amount pollutant oil drops in engine
blow-by using empirical methods. Considering that crankcase gases returned to the engine, always some
oil drops are carried into the engine and increase the pollution. The tests are down using EF7 engine in
motoring condition. Temperature and pressure of oil and water are controlled using external sensors
and actuators. Results indicate that produced oil droplets increase with increasing engine speed .Also,
the drops size decrease with increasing engine speed and oil flow rate. According to the test results, the
amount of produced oil drops in the crankcase in 4000 rpm is at least 0.25 gram/Hr. This value is important
according to EU5 pollutant regulation. To measure the drops glass micro fiber with different retention
value are used and weigh with 0.001 gram precision. Also the best arrangement for the estimate the
changing of droplet size has been investigated.

Keywords

Oil Drops

Glass Fiber Filter

Crank Case Ventilation

Cooling Jet