论文部分内容阅读
针对航空发动机润滑系统喷油嘴喷射方向的偏离问题进行研究.首先分析了喷油嘴喷射方向发生偏离的机理,然后通过计算流体动力学(CFD)的方法与软件,建立了喷油嘴喷油过程的三维数值计算模型,对不同入口速度和喷油嘴长径比条件下的喷射方向进行了多组计算与比较,得到了影响喷射方向偏离的因素及其影响规律.研究发现:喷油嘴入口处的径向速度分量导致了喷射方向的偏离,径向速度分量与法向速度分量之比越大,喷油嘴长径比越大,喷射方向偏离程度越大;对已定的喷油嘴入口速度或长径比,能够找到与之匹配的长径比或入口速度,使得喷油方向无偏离.
Aiming at the problem of nozzle jetting deviation in aeroengine lubrication system, the mechanism of jet nozzle misalignment was analyzed firstly, and then the fuel injection nozzle injection was established by CFD method and software. Process three-dimensional numerical model for different inlet velocity and injection nozzle length and diameter ratio of the jet direction of multiple sets of calculations and compared to get the jet direction deviation of the factors and the impact of the law found that: The radial velocity component at the entrance leads to the deviation of the jetting direction. The greater the ratio of the radial velocity component to the normal velocity component, the larger the nozzle length-diameter ratio, the greater the deviation of the jetting direction; Mouth inlet speed or aspect ratio, to find the matching length / diameter ratio or inlet speed, so that the fuel injection direction without deviation.