Recently, the four stroke engines are developed mainly with the environmental preservation as well as taking economy, durability and maintainability, etc. Niigata 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. Niigata improved durability and reliability by the advanced analysis technology such as performance simulation, FEA, and CFD. In order to improve environmental concerned, Niigata 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 optimum fuel injection system at the beginning of development stage. The fuel injection system performances such as the stable injection, improved performance during idle and full loads were confirmed by the component tests. The combustion chamber is most critical components for life time. Niigata 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 performance. Niigata tested the engine with cam timing variants and turbocharger matching optimization. Niigata investigates main components of prototype engine stress distribution and temperature profiles. The prototype 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.


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    Title :

    Development of Niigata medium speed diesel engine 17AHX


    Contributors:


    Publication date :

    2013


    Size :

    7 Seiten, 17 Bilder, 6 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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