| 摘要 |
PROBLEM TO BE SOLVED: To surely achieve an improvement of igniting and combusting abilities by providing an auxiliary injection hole 12 without lowering an output and increasing a cost when the swirl flow A of the compressed air pushed up after passing from a main combustion chamber 5 through a main injection hole 8 is caused in an auxiliary combustion chamber 6 and, before the main injection hole 8, branched laterally by the compressed air flow B injected from the auxiliary injection hole 12 into the auxiliary combustion chamber 6 so as to accelerate the ignition and combustion of fuel. SOLUTION: A proper length of portion of the auxiliary injection hole 12 facing the main combustion chamber 5 is formed in a tapered hole 12a having an inside diameter gradually increased toward the main combustion chamber.
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