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根据水下球形机器人的设计需要,运用CFD(computational fluid dynamics)技术,对不同流态下不同截面尺寸和曲率半径的矩形截面弯管内的黏性流动进行了数值模拟.研究了离心力作用下二次流强度和壁面黏滞阻力随弯管参数变化的情况,得出了截面宽高比为0.75的弯管的水力损失最小的结论,并对该截面形状的弯管的流动结构进行了分析.最后,在标准试验平台上运用涡量探头对出口截面的涡流强度进行了测量,从而证明了数值模拟的正确性,并通过对比分析,完成了水下球形机器人的管道设计和优化.
According to the design requirements of the underwater spherical robot, the viscous flow in a rectangular section curved pipe with different cross-sectional dimensions and radius of curvature under different flow regimes is simulated by computational fluid dynamics (CFD) The results show that the hydraulic loss of the elbow with the aspect ratio of 0.75 is the smallest, and the flow structure of the elbow with the section shape is analyzed. Finally, using the vortex probe on the standard test platform to measure the eddy current intensity at the exit cross-section, the correctness of the numerical simulation is verified. The pipeline design and optimization of the underwater spherical robot are completed through comparative analysis.