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为了调研壁面滑移现象对凝胶推进剂管道流动的影响,对凝胶推进剂及3种模拟液在直圆管中的流动进行了研究。对直圆管流动实验采集的流动数据进行壁面滑移修正,得到了壁面滑移速度公式。构建了考虑壁面滑移修正的幂律本构方程,计算出考虑滑移速度的沿程阻力系数和广义雷诺数及二者的关系。采用PIV实验并结合数值仿真,得到管道输送过程中的真实内流场速度分布以及壁面有滑移和无滑移的速度剖面图。研究表明:经过壁面滑移修正可见推进剂及模拟液幂律本构方程是唯一的;通过沿程阻力系数的计算和管道内流场PIV实验两方面验证了所用修正方法和所建流变本构方程的正确性和适用性。
In order to investigate the effect of wall slip on the flow of gel propellants, the flow of gel propellants and three kinds of simulated liquids in straight tubes were investigated. The flow data collected from the straight tube flow experiment was used to modify the wall slip, and the wall slip velocity formula was obtained. The power law constitutive equation considering wall slip correction is constructed, and the relationship between the drag coefficient and the generalized Reynolds number and sliding speed considering slip velocity are calculated. PIV experiment and numerical simulation are used to get the real flow field velocity distribution and the slip profile and slip-free profile of the pipeline during the pipeline transportation. The results show that the constitutive equation of the power-law law of propellants and simulated fluids is unique after the slip of the wall, and the correction method used and the rheology of the built fluid flow are validated by the calculation of the drag coefficient along the pipeline and the PIV experiment in the pipeline The correctness and applicability of the equation.