基于Fluent气固两相流数值模拟,研究真空冷喷涂铜颗粒的加速特性,分析了环境压力、喷涂距离、入口总温和颗粒粒径等参数对真空环境下颗粒撞击速度的影响.结果表明:环境压力是决定颗粒撞击速度的关键因素,随环境压力的变化,小直径颗粒(dp≤1μm)撞击速度的变化曲线呈抛物线状态,但大直径颗粒无显著变化；采用合适的喷涂距离,才能获得最大的颗粒撞击速度；增加入口总温可提高小直径颗粒的撞击速度,但对大直径颗粒无明显加速效果；真空冷喷涂颗粒的尺寸可从微米级减小至亚微米级,但过小的颗粒仍难达到足够高的撞击速度.
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