| 摘要 |
<p>A fuel injection valve includes: a nozzle body having an injection aperture in a tip portion thereof; and a needle that is slidably located in the nozzle body, forms a fuel introduction path between the needle and the nozzle body, and is seated on a seat portion in the nozzle body. The fuel injection valve further includes: a swirling flow generation portion that is located more upstream than the seat portion, and imparts a swirl with respect to a sliding direction of the needle to fuel introduced from the fuel introduction path; and a swirl velocity increasing portion that is located more downstream than the seat portion, and supplies fuel to the injection aperture while increasing a swirl velocity of a swirling flow generated in the swirling flow generation portion. This configuration produces an air plume by introducing burnt gas from the injection aperture, and generates fine air bubbles of fuel at a boundary face of the air plume.</p> |
