基于CFD的土工离心机风阻及流场特性分析

目的估计土工离心机的风阻功率。方法针对一稳态运行的中低速土工离心机,利用多参考坐标系(MRF)模拟转臂与墙壁之间的相对运动,对离心机稳态运行时机室内的空气流场进行CFD仿真,对计算流体力学仿真、解析公式方法和试验的风阻功率进行对比。结果三种方法得到的风阻功率较为接近,验证了数值仿真方法的正确性。同时,研究了机室内空气流速和压力的空间分布特征,验证了经典解析公式的假设合理性。结论 CFD仿真方法避免了传统解析方法对试验数据的依赖和参数选取主观性,能够得到较高精度的分析结果,该研究为基于计算流体力学的土工离心机的高置信度风阻计算打下了基础。

Wind Resistance and Flow Field Characteristic Analysis of Geotechnical Centrifuges Based on CFD

Objective To estimate wind resistance power of geotechnical centrifuge. Methods Aiming at a low-to medium-speed geotechnical centrifuge rotating at stable state, multi-reference frames (MRF) was used to simulate the relative rotation between the arm and the wall, to carry out CFD simulation for the flow field in the centrifuge chamber to compare computational fluid mechanic simulation, analytic formula and wind resistance power of test. Results Close results of wind resistance power were obtained from three methods, verifying the correctness of numerical simulation. Furthermore, spatial distribution of flow velocity and pressure in the chamber was studied and the assumptions in traditional theoretical method were examined. Conclusion CFD simulation method avoids the dependency on test data and objectivity of parameter selection of traditional analytical methods. This study lays a foundation for high-fidelity estimation of centrifuge wind resistance based on computational fluid dynamics.