螺旋槽流道微泵的数值模拟方法分析

分别在无滑移边界条件和滑移边界条件下，采用不同的双方程湍流模型以及层流模型对微型泵内部流动进行数值模拟，研究适合微型泵的计算模型和边界条件．分别使用了3种湍流模型（标准k-ε，RNGk—ε，Realizable k-ε）和层流模型进行了数值模拟，通过对流场的速度分布和压力分布的分析发现：与无滑移壁面条件的模拟结果比较，滑移壁面条件时速度分布比较均匀，但两者压力分布趋势相同．在压力与流量间的性能曲线方面，计算结果和试验结果的比较表明，在无滑移壁面边界条件时，各种模型的计算结果与试验结果总体相差很大，同时，层流模型的计算结果较好；而在滑移壁面边界条件时，所有模型的计算结果与试验结果的误差都很小，同时，标准k—ε湍流模型和RNGk—ε湍流模型的计算结果总体要比使用层流模型稍好一些，并且当泵在高转速下趋势更明显．

Analysis of numerical simulation method for flow inside micro-machined spiral-channel pump

Under different conditions of slip boundary and non-slip boundary, numerical simulations for the flows inside micro-machined spiral-channel viscous pump are investigated using laminar model and various two-equation turbulence models of standard k - ε, RNG k - ε model and realizable k - ε, respec- tively. All the simulation results in tile spiral channel show that the velocity distributions with slip boundary are more uniform than those with non-slip boundary, and both the pressure distributions are similar. For performance curves of flow rate and pressure difference, the comparisons between the calcu- lated results and the experimental data show that, for the non-slip boundary, all the calculated results de- viate considerably from the experimental and the laminar model predicts better than the turbulence ones, whereas for the slip boundary, all the models predict effectively and well, and standard k -ε and RNG k -ε model predict a bit better than laminar one, especially in high rotating speed.