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为了改进16V280ZJ型柴油机的性能,对其喷油嘴内的流场进行三维数值模拟,得到了在不同压力条件下详细的流场结构。通过流场分析可知,随着喷射压力的提高,流场湍流强度增大,湍流引起的能量损失增加,流量系数降低。并应用CAD/CAM/CFD集成的方法对喷油嘴结构进行优化,找到了喷油嘴内存在的不合理部位,将喷油嘴结构改为球形针阀后,在同等喷射压力下能够大幅度提高喷油流量。
In order to improve the performance of 16V280ZJ diesel engine, the three-dimensional numerical simulation of the flow field in the nozzle was carried out, and the detailed flow field structure under different pressure conditions was obtained. The flow field analysis shows that as the injection pressure increases, the turbulence intensity in the flow field increases, the energy loss due to turbulence increases, and the flow coefficient decreases. And the application of CAD / CAM / CFD integrated method to optimize the nozzle structure to find the nozzle there is an irrational parts, the nozzle structure to spherical needle, the same injection pressure can be significantly Improve fuel injection flow.