Exploring Acceleration Mechanism of Ultra-high Pressure Premixed Abrasive Particles in Nozzle
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摘要: 针对超高压前混合磨料粒子在喷嘴内加速过程中受力不明确的问题,对外力采用先分后和的处理方法,通过不动点迭代法和实时积分的方式建立非线性方程组,利用MATLAB软件建立数学模型求解方程,结合ANSYS仿真结果验证理论分析。喷嘴内固液两相流的仿真结果表明:理论分析及建立的数学模型能准确的阐述粒子的受力情况。磨料粒子在喷嘴收缩段内的加速过程中主要受粘性阻力、附加质量力和压强力的作用;在圆柱段内的加速过程中主要受粘性阻力和附加质量力的作用。Abstract: Because the force of the ultra-high pressure premixed abrasive particles in the nozzle during accelerationis not clear, we adopt the method of first dividing and then combining external forces andthen establish nonlinear equations with the unfixed point iterative method. We carry out the real-time integration with the MATLAB to build mathematical models to solve the nonlinearequations. We combine theoretical analysis with ANSYS simulation results. The simulation results on the solid-liquid two-phase flow in the nozzle indicate that theoretical analysis and established mathematical models can accurately describe the force of the abrasive particles. The acceleration process of abrasive particles when the nozzle contracts is mainly affected by viscous resistance, additional mass force and pressure strength. Theacceleration process of abrasive particles in their cylindrical section is mainly affected by viscous resistance and additional mass force.
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表 1 超高压软管内计算所用参数
名称 参数 流量Q 84 L/min 软管内径D 6.3 mm 磨料种类 石榴石 磨料粒子直径da 0.25×10−3 m 磨料粒子密度ρa 3.8×103 kg/m3 水动力粘性系数μ 1.14×10−3 kg/(m·s) 水的密度ρw 1.0×103 kg/m3 运动距离x 2 m 磨料初始速度${v_{{a_0}}} $ 0 -
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