扩压式旋风风能系统的数值模拟

Numerical simulation of the diffusion-tornado-type wind energy system

扩压式旋风风能系统是一种利用强涡旋流场、类似于旋风分离器的新型风能利用装置，它的进出口都是开路条件，流场比后者更复杂，更难计算．本文直接从 Ｎ－Ｓ方程出发，采用压力－速度修正方法和非均匀交错网格差分格式，模拟３整个旋风塔的强涡流场，结果满意。弄清了系统的流场机制。给出了正确描述这种流场的数字模型和程序软件。这些工作对类似的流场问题（轴对称及强涡旋流动）的研究都有意义。

The diffusion-tornado-type wind energy tower is a newly developed system utilizing wind energy. Its flow field is similar to that of a tornado-type separator with the particularity of a strong vortex flow, but more complicated and more difficult to compute than the latter because of its opened inlet and outlet. In this paper the whole field of the strong vortex flow of the tower is numerically simulated. The computation proceeds just from the N-S equations, using the presure-velocity modification method and the non-uniform interlacing grids. A basic theoretical analysis of the wind flow in the system was carried out with satisfactory results, which provides the basis to improve the design and properties of the wind energy system. Besides, this paper presents a proper mathematical model of the real flow in the tower with methods and the programs for computation. It is no doubt of great importance to all the researches on problems which have the flow fields similar to that dealt with in this paper.