The Effect of Back Pressure on the Operation of （在运行背压的影响）.pdf

UNCLASSIFIED The Effect of Back Pressure on the Operation of a Diesel Engine Peter Hield Maritime Platforms Division Defence Science and Technology Organisation DSTO-TR-2531 ABSTRACT The Ricardo Wave engine modelling software has been used to examine the effect of increased back pressure on a turbocharged diesel engine. Steady state and varying back pressure are considered. The results show that high back pressure has a significant adverse effect on the operation and reliability of the engine. The response to fluctuating back pressure is strongly non- linear, and depends on the amplitude and period of the fluctuations. For a constant output load, the exhaust gas temperature increases significantly with increasing back pressure, leading to reduced engine reliability. Due to the speed control strategy used on this engine, speed fluctuations are an unavoidable consequence of imposed back pressure fluctuations. RELEASE LIMITATION Approved for public release UNCLASSIFIED UNCLASSIFIED Published by Maritime Platforms Division DSTO Defence Science and Technology Organisation 506 Lorimer St Fishermans Bend, Victoria 3207 Australia Telephone: (03) 9626 7000 Fax: (03) 9626 7999 © Commonwealth of Australia 2011 AR-014-968 February 2011 APPROVED FOR PUBLIC RELEASE UNCLASSIFIED UNCLASSIFIED The Effect of Back Pressure on the Operation of a Diesel Engine Executive Summary Diesel