The concept of Oil Stress in a low speed two-stroke Diesel engine has yet to be tackled in the same way or depth as it has been in the four-stroke engine. The present work illustrates a predictive model for cylinder oil stress in low speed two-stroke Diesel engines based on the results from several enginetest campaigns. The experimental investigation has been carried out on Wärtsilä large bore marine diesel engines equipped with several lubrication oil systems and on the Bolnes 3(1) DNL 170/600 research engine from Shell Global Solutions (Germany) GmbH. Acquired experimental data regarded both cylinder oil sampling techniques, chemical and physical laboratory analysis of the oil samples and optical technique to quantify the amount of oil blown off though the inlet ports from the piston ring pack. Relevant differences in used cylinder lube oil properties between samples gathered with different techniques have been found. The paper will describe these findings and will propose an innovative way of looking at oil stress analysis in two-stroke engines.
Cylinder Lubrication – Understanding Oil Stress in the low speed two- stroke Diesel engine
DE RISI, Arturo
2010-01-01
Abstract
The concept of Oil Stress in a low speed two-stroke Diesel engine has yet to be tackled in the same way or depth as it has been in the four-stroke engine. The present work illustrates a predictive model for cylinder oil stress in low speed two-stroke Diesel engines based on the results from several enginetest campaigns. The experimental investigation has been carried out on Wärtsilä large bore marine diesel engines equipped with several lubrication oil systems and on the Bolnes 3(1) DNL 170/600 research engine from Shell Global Solutions (Germany) GmbH. Acquired experimental data regarded both cylinder oil sampling techniques, chemical and physical laboratory analysis of the oil samples and optical technique to quantify the amount of oil blown off though the inlet ports from the piston ring pack. Relevant differences in used cylinder lube oil properties between samples gathered with different techniques have been found. The paper will describe these findings and will propose an innovative way of looking at oil stress analysis in two-stroke engines.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
