【作者】 卢新根；

【导师】 朱俊强；

【作者基本信息】 西北工业大学 ， 流体机械及工程， 2004， 硕士

【摘要】 本文给出了相对旋转坐标系下叶轮机械内部三维粘性流动的守恒型积分型方程组，利用Denton J.D.教授的粘性体积力法来模拟粘性对叶轮机械内部流动的影响，采用时间推进法和有限体积差分格式对叶轮机械内部的流动进行求解。为加速计算收敛速度，除了采用当地时间步长和局部残差光顺技术外，通过改造插值算子，提出了一种能够与本文算法很好地结合的多重网格法。与NASA Rotor37的计算结果对比表明，本文多重网格算法的计算结果与Denton J.D.的计算结果十分接近，而在提高计算效率方面比Denton J.D的多重网格算法更加有效。 在以上工作的基础上，采用“薄叶片”假设，发展了一种用于计算考虑顶部间隙的压气机转子内部流场的三维粘性程序。对某压气机转子项部间隙内的流动进行了详细的数值模拟，计算结果与试验结果吻合良好。研究了顶部间隙对压气机转子总性能及内部流场的影响。数值结果表明叶顶间隙的引入恶化了压气机转子的性能。同时，由于转子叶片压力面和吸力面之间压力梯度以及叶顶与机匣之问的相对运动产生的间隙流对转子通道内的细微流动结构有较大的影响。更多还原

【Abstract】 The integral equations governing the three-dimensional viscous flow inside the turbo-machinery in the rotating coordinate system are presented in this paper, the viscous effects are simulated by the distributed body force described by Professor Denton J.D. The time-marching method and explicit finite volume difference scheme are employed to solve the flow inside the turbo-machinery. In order to accelerate the convergence, residual smoothing and local time stepping were employed. In the same time, By improving Prolongation Operator, a new multi-grid scheme which can combine well with the algorithm of this thesis. The calculation of the37# transonic compressor rotor shows that the simulation results of the author’s multi-grid scheme fit fairly well with those of Professor Denton J.D.’s, however, the author’s converging speed is faster.On the basis of above work, by using of "thin blade approximation", a 3D viscous code had been developed to calculate flow field in rotor with tip clearance. The flow field in the rotor tip of a compressor was numerical analyzed using the calculation method, the result compare well with experimental data. The influence of tip clearance on overall performance and detailed flow structure in tip region of an axial compressor rotor was investigated. It was found that the introduce of tip clearance deteriorate the overall performance of the compressor rotor. At the same time, tip leakage induced by pressure gradient and relative motion between the blade tip and the shroud wall is found to have a major influence on detailed flow properties in tip region of rotor passage.更多还原