【摘要】 粒子成像测速仪(PIV)技术是一种测量叶轮机械内部流场的有效手段。本文利用对开式前缘弯掠轴流风扇进行PIV实验,捕捉到了开式轴流风扇的叶尖涡。实验结果表明,叶尖涡产生于叶顶前缘的吸力面,其涡核沿一条与旋转方向相反的斜线延伸,一直到转子下游出口。PIV实验数据和CFD内流计算结果吻合良好。本实验为改善风扇性能和认识其内流机制提供了可靠的实验依据。更多还原

【Abstract】 The Particle Image Velocimetry(PIV) is an efficient method for measuring the internal flow field of turbomachinery. This paper studied the velocity field of a forward swept axial-flow fan with no casing configuration by means of PIV technology, and a tip vortex phenomenon is observed. Experimental results showed that this tip vortex existed at the leading edge of the blade. The generating, developing and dissipating evolvement process of the tip vortex from the blade’s leading edge to the downstream were discussed in detail. The tested PIV results agreed well with the calculated CFD data. The experimental data provided in this paper prove reliable for improving the aerodynamic characteristics of the open axial flow fan.更多还原