Direct Injection of High-Pressure Natural Gas in Reciprocating Engines. Final Report March 1986-August 1987

摘要

Combustion of directly injected natural gas was achieved in a single cylinder version of a Cummins 903 engine by activating some of the compressed gas prior to injection. Activation was achieved by creating a plasma of natural gas within an electronically controlled injector which could be retrofit onto the engine. Emissions of NOx were substantially and consistently less than those of the base diesel engine, but the efficiency was lower because of a relatively long and late heat release profile. Injection and activation parameters responsible for the lower efficiency are mentioned and several approaches to improve efficiency are discussed. Electrode erosion rates were high and means of reducing erosion are described.