Yジェット形二流体式燃料噴射弁の研究

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In order to improve the performance of a combustion chamber for gas turbines in which residual fuel oil is burned under high ambient air pressure, we had planned to use a twin fluid atomizer of Y-jet type for this combustor. At present, swirl atomizers are widely used in boilers, industrial gas turbines and turbojet engines. But generally the spray of swirl atomizer contracts in the down stream of the atomizer, under high ambient air pressure. It is considered that the spray contraction is one of the causes that bring the increase in exhaust smoke and the decrease in combustion efficiency. In the Y-jet type twin fluid atomizer, the sprays from the spray holes separate individually, although they form, as a whole, a hollow-cone spray. Thus it is expected that the hollow-cone spray produced by a Y-jet type atomizer does not contract, even under high ambient air pressure. From this point of view, it was decided to use this type of atomizer for the combustion chamber mentioned above. But there are no available data on the spray characteristics of the Y-jet type atomizer, although it is widely used for boilers. This paper deals with the experimental results of the spray characteristics such as droplet size and the volume flow-rate distribution in the twin fluid atomizer of Y-jet type. For the experiment, air is used as the atomizing medium, and water as the liquid fuel. The droplet samples at various points in the spray were taken by the immersion method. The items described are as follows: 1) the streaks of spray, 2) effect of operating conditions on the spray characteristics, 3) scale effect of atomizer, 4) interference of spray.
独立行政法人海上技術安全研究所の論文
1975-02-20

Yジェット形二流体式燃料噴射弁の研究

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