In recent years, various approaches to environmental problems are carried out. As for marine diesel engine, IMO (International Maritime Organization) has phased in emission regulations mainly against NO(x) reduction in exhaust gas. To comply with this emission regulation, all marine diesel engine manufacturers are advancing the development of next-generation marine engines. Some typical technologies effective for reducing NO(x) in exhaust gas are miller cycle engine, EGR (Exhaust Gas Recirculation), SCR (Selective Catalytic Reduction), gas fuel engine, and application of water emulsion fuel, etc. Among these technologies, miller cycle engine has already been put to practical use in many marine diesel engine manufacturers, because of the great advantage in development cost due to smaller change necessary in structural design compared to the conventional. Additionally, Miller cycle engine is known to be effective in combination with other NOx reducing technologies and is expected to be applied continuously. Higher supercharging is necessary to realize miller cycle engine. Therefore, higher pressure ratio is coming to be required for marine turbochargers ever more in recent years. In addition, there are constant requirements for marine turbochargers such as higher efficiency, wider operation range and higher performance at low speed. To meet these demands, IHI has developed a radial type high-pressure ratio turbocharger, named High pressure ratio AT14 (New AT14). The New AT14 has achieved higher pressure ratio compared to the conventional by improving some design methods such as the increase of circumferential speed of compressor wheel and optimization of compressor blades and recirculation devices aerodynamic geometry by using CFD and so on. These technical efforts lead to the improvement of pressure ratio from 3.8 up to 5.0 at the engine operation point. New AT14 turbocharger has already been adopted as a standard model by some engine builders, and is expected to show its high performance in the global market. In this paper the development of AT23 turbocharger will be shown with some of the obtained test results. AT23 turbocharger is the turbocharger IHI has developed lately for smaller marine diesel engines than engines which applies AT14 turbochargers. Aerodynamic parts such as compressor and turbine were redesigned and shafting was also redesigned to reduce mechanical loss. AT23 turbocharger has achieved higher pressure ratio and efficiency compared to IHI's conventional turbochargers. On the other hand, turbochargers are required not only high pressure ratio and efficiency but also safety, durability, longer mechanical life and easier maintenances. AT23 turbocharger has improved some of the structures, to respond to these requirements.


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    Title :

    Development of high-pressure ratio and high-efficiency type turbocharger


    Contributors:


    Publication date :

    2013


    Size :

    11 Seiten, 21 Bilder, 4 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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