小形ガスタービン用エルボ形燃焼器の研究 : 第2報, 燃焼器性能の改善

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As noted in Part I, reverse flow or elbow-shaped combustion chambers of can type are suitable for small gas turbines to attain compactness of the whole unit. In these types of combustion chambers, the incoming air flow is not symmetrical with the axis, and it is felt that the maldistribution of air flow will cause poor combustor performance. As the maldistribution of the incoming air flow is seemed to be more marked in the elbow-type than in the reverse flow type, an experimental study was carried out on an elbow-type combustion chamber with single air inlet which was designed to be used for a small gas turbine of about 23 PS output. The result obtained is as follows: (a) Poor combustor performance due to maldistribution of the incoming air flow can be improved by putting a cover over the first flame tube and by introducing the dilution air perpendicularly to the axis of combustor through two large slots arranged on opposite sides of the dilution zone. (b) Combustor performance is seemed to be closely related to the air flow pattern in the combustor which was observed under isothermal conditions, and some examples have been shown to illustrate the good qualitative correlations between them. (c) The combustor was fitted with a simplex swirl atomizer. The combustor performance is also closely related to the sprat characteristics of the atomizer. A significant decrease in combustion efficiency occurs as the spray configuration changes from fully developed spray to tulip-shaped spray, and the blow-out of flame at lean side occurs near the bubble-like spray. At this stage of spray configuration, the spray characteristics are very poor in regard to both atomization and spray dispersion.
独立行政法人海上技術安全研究所の論文
1967-03-31

小形ガスタービン用エルボ形燃焼器の研究 : 第2報, 燃焼器性能の改善

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