【作者】

Keisuke Matsumoto

【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。 In recent years, various approaches to environmental problems are carried out. As for ma- rine diesel engine, IMO(International Maritime Orga- nization) has phased in emission regulations mainly against NOx reduction in exhaust gas. To comply with this emission regulation, all marine diesel en-gine manufacturers are advancing the development of next-generation marine engines. Some typical tech- nologies effective for reducing NOx in exhaust gas are miller cycle engine, EGR(=Exhaust Gas Recircula- tion), SCR(=Selective Catalytic Reduction), gas fuelengine, and application of water emulsion fuel, etc. Among these technologies, miller cycle engine has al- ready been put to practical use in many marine diesel engine manufacturers, because of the great advan- tage in development cost due to smaller change nec-essary in structural design compared to the conven- tional. Additionally, Miller cycle engine is known to beeffective in combination with other NOx reducing tech- nologies and is expected to be applied continuously. Higher supercharging is necessary to realize miller cy- cle engine. Therefore, higher pressure ratio is comingto be required for marine turbochargers ever more inrecent years. In addition, there are constant require- ments for marine turbochargers such as higher effi-ciency, wider operation range and higher performance at low speed. To meet these demands, IHI has de- veloped a radial type high-pressure ratio turbocharger,named High pressure ratio AT14(New AT14). The New AT14 has achieved higher pressure ratio com- pared 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 geome- try 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 tur- bocharger has already been adopted as a standardmodel 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 partssuch 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 tur- bochargers. On the other hand, turbochargers are re- quired not only high pressure ratio and efficiency butalso safety, durability, longer mechanical life and eas- ier maintenances. AT23 turbocharger has improved some of the structures, to respond to these require- ments.

【会议名称】

第27届CIMAC会议

【会议地点】

上海

【下载次数】

5

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