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Bulk flow模型被广泛应用于计算火箭涡轮泵间隙密封泄漏量和动力学系数,然而半经验性的边界条件和阻力系数会降低模型的准确性。CFD数值模拟近年来被应用于间隙密封的研究,表现出优越的性能,然而瞬态计算动力学系数效率较低。结合两种方法的优势,利用CFD稳态流场分布,计算密封间隙边界条件,同时基于泄漏量相等优化目标,确定Bulk flow模型中阻力系数,并采用有限单元法数值求解优化后Bulk flow方程组。与文献中数值结果对比,数值结果与试验结果更加吻合,主刚度和交叉刚度最大偏差率为10.15%和7.54%。
The Bulk flow model is widely used to calculate the clearance and dynamic coefficient of clearance of rocket turbo pump. However, the semi-empirical boundary conditions and drag coefficient will reduce the accuracy of the model. CFD numerical simulation has been applied to the study of gap seals in recent years, showing superior performance, however, transient calculation of kinetic coefficients is less efficient. Combining the advantages of the two methods, the steady-state flow field distribution of CFD was used to calculate the boundary conditions of seal clearance. Based on the equal optimization of leakage, the drag coefficient of Bulk flow model was determined and solved by the finite element method . Compared with the numerical results in the literature, the numerical results are in good agreement with the experimental results. The maximum deviation rates of the main stiffness and the cross-rigidity are 10.15% and 7.54%.