Experimental investigation of unsteady flow in axial skewed fans according to flow rates

被引：12

作者：

Jin, Guangyuan ^{[1
]}

Ouyang, Hua ^{[2
]}

Du, Zhaohui ^{[2
,3
]}

机构：

[1] Jiangnan Univ, Sch Mech Engn, Jiangsu, Peoples R China

[2] Shanghai Jiao Tong Univ, Sch Mech Engn, Shanghai, Peoples R China

[3] Shanghai Jiao Tong Univ, Sch Aeronaut & Astronaut, Shanghai, Peoples R China

来源：

EXPERIMENTAL THERMAL AND FLUID SCIENCE | 2013年 / 48卷

关键词：

Unsteady flow; Axial fan; Skewed blade; Off-design condition; Hot-wire anemometry; BLADE SWEEP; DOWNSTREAM; ROTORS;

D O I：

10.1016/j.expthermflusci.2013.02.011

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Unsteady flow in axial fans with circumferential skewed blades were measured at off-design conditions using a hot-wire test, to investigate the effect of sweep on aerodynamic limit and aeroacoustic sound source. Two circumferential skewed fans, with the blade skew angles at 8.3 degrees forward and backward, respectively, were investigated in this study. The instantaneous flow field in the upstream and downstream of these fans was measured at off-design operations, using a two-dimensional (20) probe based on a Constant Temperature Anemometry (CTA) system, and a NI PXI data collecting system. From the measured results, the characteristics of time domain and frequency domain were presented. The three-dimensional (3D) structure and turbulent characteristics of inlet and outlet flow in circumferential skewed fans were analyzed according to flow rate. Unsteady flow instability and its relation with circumferential skewed blades, to expand stall-free operation range and suppress noise of axial fans, were discussed. The sweep blade is found to be effective in controlling unsteady flow to improve aerodynamic limit and reduce noise source in these rotors at off-design operations. (c) 2013 Elsevier Inc. All rights reserved.

引用

页码：81 / 96

页数：16

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