环形扩压通道内有旋绕流动的研究

本文计算了环形截面的扩压通道内带进气旋绕的流动.在小横向流假定下.用三维边界层积分方程法求解内外壁面附近的流动.通过对子午面上与流线子午投影准正交方向的速度梯度方程和流量不变方程的迭代求解得出边界层外的势流场.计算与实验结果基本符合.本研究可用于分析环形扩压器内带进气予旋的流动.

横向自然风对逆流式自然通凤冷却塔内部流动的影响

横向自然风对逆流式自然通风冷却塔内流动的影响,目前尚无明确的分析与结论。本文在紧凑的双层循环水槽上进行冷态水模试验研究,通过彩液法显示流动,用粘性剪切诱导涡、紊动射流概念分析流动特征,并在此基础上提出了斜坡巡行走道、“十”字形导风墙等避免自然风不良影响以改善塔内流动的措施,经试验证明是有效的。

ON THE THROUGHFLOW WITH SWIRLING INFLOW IN ANNULAR DIFFUSER

In this paper, a throughflow with swirling inflow in an annular diffuser is calculated. Under the assumption of small cross-flow, the flow near inner and outer wall surfaces is calculated based on the three-dimensional momentum integral equation of the boundary layer. The potential flow outside the boundary layer is computed by means of the iteration method based on the velocity gradient equation along the quasi-orthogonal direction of the meridional projection of the stream-line on the meridional surface and the constancy of flux equation[1]. The numerical results agree with the experiments quite well. This method is useful for analyzing the throughflow with pre-swirl in the annular diffuser.

旋绕对环形扩压器性能影响的理论与试验研究

本文针对由圆筒机壳和内锥芯体组成的环形扩压器进行了理论计算和大量的试验研究,深入探讨了旋绕对其内部流场和性能影响的规律。结果表明,在环形扩压器入口给予适当旋绕能够显著改善扩压器的流场和性能,从而为此类扩压器的设计和研究提供了一种有效的手段。