30 Mpa Mixing Controlled Combustion
The level of peak cylinder pressure and indicated mean effective pressure have increased rather constantly in compression ignition internal combustion engines over the past decades. Present medium-speed engines are capable of running with about 20 MPa peak cylinder pressure. In this study the new values of high peak cylinder pressure level of 30 MPa are reviewed for the first time. The goal of the present study has been to build up a mediumspeed research engine with the ability of running with 30 MPa peak cylinder pressure and demonstrate the high peak cylinder pressure combustion. The ultimate objective of the high pressure combustion is emission reduction with simultaneous high power density. The research engine has a special made crankshaft and a special made connecting rod. Piston and cylinder liner are made for high pressures and high heat load. The cylinder head of the engine is fully machined. Charge air is produced by an external compressor giving 1.0 MPa charge air pressure at maximum. The engine is equipped with a hydraulic fully adjustable gas exchange valve train. The first engine tests with 30 MPa peak cylinder pressure have been carried out with high relative air to fuel ratio and with various indicated mean effective pressures up to 3.7 MPa. High efficiency and low fuel consumption values were achieved with no penalty in emissions. The pressure curves and the analyzed heat release curves indicate fine mixing controlled combustion. This gives motivation to continue the research work of high peak cylinder pressure combustion with both experimental and numerical methods.
Martti Larmi Ilari Kallio Antti Elonheimo Teemu Sarjovaara Matteo Imperato
Aalto University,Finland
国际会议
上海
英文
1-9
2013-05-13（万方平台首次上网日期，不代表论文的发表时间）