Effect of Supplied Air Quantity on the Thermal Load in Combustion Chamber Walls on 2 Stroke Diesel Engine

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The thermal loads in combustion chamber walls on 2-stroke diesel engine having large cylinder bore, which is a serious problem at present, is controlled by the supplied air quantity. In order to grasp quantitative relations, we carried out a series of systematical tests on the supercharging system, on these tests the supplied air quantity was changed systematically by changing the turbinenozzle area and blower diffuser inner diameter, and by discharging a part of the scavenging air to atmosphere. And, from a viewpoint of supplied air quantity, we carried out three more tests on the running condition: scavenging air temperature, fuel injection timing and operation using low quality heavy oil. The results of these tests are following.<BR>(1) First, the factors controlling thermal loads in combustion chamber walls were investigated, the air fuel ratio for the trapping air in the cylinder and scavenging air volume coefficient were defined, as the cycle characteristic factors for the supplied air quantity. And, the quantitative characteristics of these two factors for wall temperature was grasped, as a result of analyzing measured wall temprateures on those tests. Especially, it was found that scavenging air swirl controlled by scavenging air or blow by air gave heating effect by remained gas for the central parts in combustion chamber walls, and that this factor must be considered as the factor controlling thermal load.<BR>(2) Instead of above-mentioned cycle characteristic factors, total air fuel ratio and scavenging air pressure coefficient, that are able to measure, were defined, and the quantitative characteristics of these two factors for wall temperature were grasped. Especially, it was found that exhaust valve temperature was decided only by the latter, and other wall temperature by the former.<BR>(3) By the characteristics of above-mentioned factors, the characteristics on wall temperaturc for turbine nozzle area, blower diffuser inner diameter, suction air quantity, scavenging air temperature, fuel injection timing and operation using low quality heavy oil was quantitatively grasped.<BR>(4) The charateristics of temperature distribution in the circumferential direction, surface and section of the walls was grasped.
公益社団法人日本マリンエンジニアリング学会の論文

Effect of Supplied Air Quantity on the Thermal Load in Combustion Chamber Walls on 2 Stroke Diesel Engine

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