| 摘要 |
A method of forming a fuel feed passage in a feed arm 12 of a fuel injector 10. The method includes the steps of providing a fuel feed passage in the feed arm of the fuel injector. The feed passage 24 has an initial cross-sectional flow area that corresponds with an initial fuel flow velocity. The method further includes decreasing the initial cross-sectional flow area of the fuel feed passage to obtain a desired fuel flow velocity for the fuel feed passage at a given fuel flow rate. The cross-sectional flow area is modified by positioning a shaped structure, such as a rod 26, within the fuel feed passage, and providing a helical formation 30 about the shaped structure, to obtain the desired fuel flow velocity. Additionally, the method provides an initial convection heat transfer coefficient and initial localized wetted wall temperatures at the initial cross-sectional flow area of the fuel feed passage, and an increased fuel flow velocity and convection heat transfer coefficient, but a reduced localized wetted wall temperature, at the decreased cross-sectional area. This is achieved without varying the fuel flow rate and fuel temperature. |
