基于有限元的固液两相射流冲刷磨损率数值研究

利用数值模拟方法研究了不锈钢受到固液两相射流冲蚀作用后发生的磨损过程, 对不同粒径的试样进行了磨损率测试。结果表明:流体在喷嘴出口部位的速度约等于10 m/s, 当流体与面板发生撞击后便会流向下游, 在射流喷嘴口附件存在一个明显的压力较高的滞止区域。下游区域磨损率明显高于上游区域, 并且与圆心距离越远的地方冲刷磨损率也越大, 之后逐渐降低。当流体与冲蚀壁面接触之后便会流向下游区域, 对下游区域造成较大的冲蚀作用, 使下游产生较大的冲刷磨损率。越靠近下游区域, 冲蚀磨损率表现为先增大后降低的现象, 越靠近上游磨损率越小。平均冲刷磨损率和射流速度呈指数关系。

Erosion Wear Rate of Solid-Liquid Two-Phase Jet:A Simulation Study

The surface erosion of a rectangular stainless-steel plate, sputtered at an angle by solid-liquid twophase jet, was mathematically modeled, theoretically analyzed and numerically simulated in finite element method.The influence of the particle properties, including the size, position, mass fraction and velocity of solid particles at the nozzle's outlet, on the erosion wear-rate was investigated. The simulated results show that the particle properties have a major impact. For example, the fluid velocity at the outlet is about 10 m/s; a high pressure stagnation region appears at the nozzle's attachment after the plate forces the fluid to downstream; the wear-rate in the downstream is significantly higher than that in the upstream, a roughly increasing radial wear-rate profile exists in the plate's sampling-circle. As the fluid flows downstream, both the impact and wear-rate change in an increase-decrease mode. The average wear-rate depends exponentially on the jet velocity.