| 摘要 |
PROBLEM TO BE SOLVED: To obtain a large atomization width while reducing the variation of an equivalent ratio in atomization.SOLUTION: An injection hole 712 includes a flow straightening region 712a which straightens the flow of fuel, and an enlarged area 712b which is continuously formed in a fuel flow downstream side of the flow straightening region 712a, a passage area of which progressively increases toward the downstream side, and from a terminal end of which the fuel is injected. Provided that a passage area of a terminal end of the flow straightening region 712a is represented as S1, the passage area of the terminal end of the enlarged area 712b is represented as S2, and S2/S1 is regarded as a shape characteristic value X, the shape characteristic value X is set to a value more than 1.0 and equal to or less than 4.0. |
