Open Access
 Issue JNWPU Volume 37, Number 3, June 2019 580 - 586 https://doi.org/10.1051/jnwpu/20193730580 20 September 2019

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

## 1 理论推导

### 1.1 风扇桨叶叶剖面旋转系数与安装角的关系

 图1风扇示意图
 图2常规风洞轴流风扇叶剖面的速度构成图

### 1.2 风扇流量、压升与安装角的关系

(14) 式给出了风洞回路损失系数、风扇效率与风扇流量、安装角之间的关系, At为试验段面积。

## 2 应用举例

### 2.1 风洞简介

 图3风洞三维模型图

### 2.2 风扇简介

 图4风扇三维模型图

### 2.3 风扇安装角调整计算

 图5安装角调整前后, 风扇桨叶展向升力系数

### 2.4 试验验证

 图6安装角调整前后，风扇转速、功率与试验段风速关系

## 3 结论

1) 依据风洞轴流风扇运行的特殊性, 结合风扇二维叶素理论, 以风扇效率η和风洞损失系数ε作为重要参数, 推导出风扇流量与桨叶安装角之间的固有关系, 由此可以在不进行风扇压升测试的情况下, 依据风扇转速与流量, 理论预测风扇安装角调整后的基本运行参数。

2) 针对某低速风洞主回路试验段风速需要在风扇转速为575 r/min时达到60 m/s的调试要求, 利用本文所述方法进行风扇安装角计算, 理论预测的调整值4.45°, 实际调整4.5°, 最终风扇实际转速在570 r/min实现了试验段风速60 m/s的调试目标, 虽然风扇实际转速比既定转速575 r/min小5 r/min, 但0.9%的偏差在工程上是可以被接受的, 本文所述的风扇安装角调整方法完全能够满足低速风洞调试过程中风扇安装角的调整需要。

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## All Figures

 图1风扇示意图 In the text
 图2常规风洞轴流风扇叶剖面的速度构成图 In the text
 图3风洞三维模型图 In the text
 图4风扇三维模型图 In the text
 图5安装角调整前后, 风扇桨叶展向升力系数 In the text
 图6安装角调整前后，风扇转速、功率与试验段风速关系 In the text

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