【作者】

Junichi Sato,Katuyuki Toda,Toshiyuki Saito

【摘要】

论文已在中国上海举行的第27届CIMAC大会上发表。论文的版权归CIMAC所有。Recently, the four stroke engines are developed mainly with the environmental preservation as well as taking economy, durability and maintainability, etc. Nigata has developed high power density new four-stroke medium speed diesel engine The 17AHX'The 17AHX' has 165 mm bore and 265 mm stroke, engine speed 900rpm,1000rpm and 1200rpm. The 17AHX covered with 500kW to 1125kW output ranges of marine auxiliary engines, marine propulsion and electric propulsion engines that run on MDO and heavy fuel oil. Niigata achieved shorten development period around one year by using front loading such as performance simulation, CFD, FEA were carried out early development stage. Nigata improved durability and reliability by the advanced analysis technology such as performance simulation, FEA, and CFD.In order to improve environmental concerned, Nigata considered optimizing compression ratio, valve timing, piston bowl shape, turbocharger matching and fuel injection system by using performance simulation. Niigata carried out simulation analysis for the optimumfuel injection system at the beginning of development stage. The fuel injection system performances such as the stable injection, improved performance duringidle and full loads were confirmed by the component tests. The combustion chamber is most critical compo- nents for life time. Nigata has designed carefully the combustion chamber to achieve longer life time. Especially, FEA and CFD were applied to produce a highly rigid construction and effective cooling on the combustion chamber. The moving parts were optimized and reduced weight through FEA. It was tested the engine with two exhaust systems such as constant pressure and pulse. The valve timing is inference of engine per-formance. Nigata tested the engine with cam timing variants and turbocharger matching optimization. Ni-igata investigates main components of prototype engine stress distribution and temperature profiles. Theprototype engine verify the durability of the new engine, endurance tests have been performed. This paper describes the design features of the main components of ' the 17AHX', simulation results and engine test results.

【会议名称】

第27届CIMAC会议

【会议地点】

上海

【下载次数】

1

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