大雷诺数磨削冷却液流场的数值模拟研究

Numerical Simulation Investigation of Grinding Fluidic Field with High Reynolds Number

为寻找雷诺数Re较大时准确地模拟磨削冷却液流场的数值方法,利用有限体积法离散不可压缩的N-S方程,采用k-ε模型和RNGk-ε模型分别对磨削过程的磨削冷却液流场进行了数值模拟,得到了磨削冷却液的流场压力及速度分布规律。结果表明:当雷诺数Re大于等于1000时,RNGk-ε模型的仿真结果与实验结果吻合很好,采用RNGk-ε模型可很好地模拟冷却液流场的特性;当雷诺数相同时,磨削冷却液流场的最大动压力随着最小间隙的增大而减小,砂轮与工件之间最小间隙的越小,磨削冷却液流场的水平方向速度越先变为负值;当最小间隙相同时,磨削冷却液流场的最大动压力随着雷诺数的提高而增大。

Finite volume method was employed to treat N-S equations in order to obtain accurate numerical simulation methods for high Reynolds number.k-ε model and RNG k-ε model were applied to calculate fluidic field in the process of grinding.The pressure distributions and velocity distributions of grinding fluidic field were obtained.The results show that the simulation results of RNG k-ε model match the experimental results well,which demonstrates that RNG k-ε model is more suitable to the analysis of grinding flu...