Paper 4: High-Output Medium-Speed Diesel Engine Air and Exhaust System Flow Losses

Abstract

This paper gives the results of air-flow tests through two-stroke cycle and four-stroke cycle diesel engine cylinder heads and ports on steady-flow low-pressure air flow rigs.An analysis is made of the pressure drop through a diesel engine cylinder head inlet port system which shows the effect of the various parts of the system on flow loss. This also includes the effects of valve lift, valve seat angle, and valve shape on isentropic area.A comparison is made between tandem and Siamese porting on a four-stroke cycle engine cylinder head. The results of tests on uniflow scavenged two-stroke cycle inlet ports and exhaust valves are also included.