The internal flow of GDI multi-hole nozzle was simulated with the two-phase non-linear cavitation flow model .In the constant volume chamber ,the spray characteristics of injector were simulated with the calculated flow results of nozzle out-let and Huh-Gosman model .The numerical model was verified by the spray test and the influences of injection pressure and back pressure on spray characteristics were analyzed .The research shows that the simulation results are close to the experimen-tal results in the spray pattern and the former spray penetration is slightly larger than the latter .The increased injection pres-sure can improve the spray penetration ,strengthen the interaction between fuel and air and decrease the (Sauter mean diameter) SMD .In the higher injection back pressure ,the spray penetration decreases obviously and the fuel accumulates seriously in the beam end .%采用两相流非线性空化模型对GDI多孔喷油器内部流动进行数值模拟，使用喷孔出口计算结果，结合Huh-Gosman喷雾模型在定容室内对喷油器喷雾特性进行数值模拟。通过喷雾试验对计算模型进行验证，分析了喷油压力和喷射背压对喷雾特性的影响。研究结果发现：在喷雾形态上模拟结果与试验结果接近，贯穿距离模拟值略大于试验值；提高喷油压力可以增加贯穿距离，增强燃油与空气的相互作用，减小SMD ；在较高的喷射背压下，喷雾贯穿距离明显减小，油束末端的燃油聚集严重。
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