﻿ 离心压缩机进口可调导叶尾缘吹气数值模拟
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 哈尔滨工程大学学报  2018, Vol. 39 Issue (6): 1006-1011  DOI: 10.11990/jheu.201611065 0

### 引用本文

XIN Jianchi, WANG Xiaofang, CHEN Xudong, et al. Numerical simulation of variable inlet guide vane with trailing-edge blowing in centrifugal compressor[J]. Journal of Harbin Engineering University, 2018, 39(6), 1006-1011. DOI: 10.11990/jheu.201611065.

### 文章历史

1. 大连理工大学 能源与动力学院, 辽宁 大连 116024;
2. 大连理工大学 海洋能源利用与节能教育部重点实验室, 辽宁 大连 116014;
3. 沈阳鼓风机集团股份有限公司, 辽宁 沈阳 110000

Numerical simulation of variable inlet guide vane with trailing-edge blowing in centrifugal compressor
XIN Jianchi1, WANG Xiaofang1, CHEN Xudong1, SHI Hai3, ZHOU Lusheng1, YANG Shuhua1,3
1. School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China;
2. Key Laboratory of Ocean Energy Utilization and Energy Conservation, Dalian University of Technology, Dalian 116024, China;
3. Shenyang Blower Works Group Corporation, Shenyang 110000, China
Abstract: In order to compensate the wake effect casing by guide vane, the air injection through two channels is applied to the trailing edge. The trailing edge blowing reduces the impact of rotor-stator interaction and further decreases the aerodynamic load on the following impeller. Thus, it improves the safty of the impeller. Based on numerical simulations, this article studies on the effect of the trailing edge blowing structure in a centrifugal compressor with variable inlet guide vane. The study analyzes the flow field and aerodynamic load under different guide vane angle during the centrifugal compressor operation. The simulation results show that the trailing edge blowing has a little influence on compressor performance. Under different blowing flows, the flow field shows different wake styles, which include pure wake, weak wake, momentumless wake and jet. When the blowing set 2% of the total flow under 0 degree guide vane angle, the momentumless wake appears, and the aerodynamic load on impellers has been reduced significantly, especially at the middle span of the impellers. With the increasing of the guide vane angle, the wake distribution after the guide vane appears significant difference as the development of wall separation flow. It needs more blowing flow to reach the momentumless wake style, however, the effect has decreased. When the guide vane angle is large than 50 degrees above, the influence of wakes can be ignored.
Key words: centrifugal compressor    variable inlet guide vane    trailing edge blowing    aerodynamic load    numerical simulation    operation condition    momentumless wake

1 压缩机模型

 Download: 图 1 离心压缩机模型 Fig. 1 The computational model of the centrifugal compressor

 Download: 图 2 吹气结构示意图 Fig. 2 The geometry of the trailing-edge blowing added to guide vanes of the compressor
2 数值模拟设定

3 数值计算结果及分析 3.1 压缩机性能分析

 Download: 图 4 不同开度下特性线对比 Fig. 4 The characteristic curves of the compressor under different angle of the guide vane
3.2 吹气流场特征

 $\frac{\theta }{d} = \int\limits_{ - \infty }^{ + \infty } {\frac{U}{{{U_\infty }}}(1 - \frac{U}{{{U_\infty }}})} {\rm{d(}}\frac{y}{d}{\rm{)}}$ (1)

 Download: 图 6 导叶0.5B2B截面速度矢量对比(开度为0°) Fig. 6 The vector at 0.5 span of the guide vane trailing-edge (0° opening)
 Download: 图 7 轴向方向尾迹发展分布 Fig. 7 Development of pure wake and momentumless wake at different axial positions

 Download: 图 8 导叶0.5 B2B截面速度矢量对比(开度为40°) Fig. 8 The vector at 0.5 span of the guide vane trailing-edge(40° opening)

 Download: 图 9 无动量亏损尾迹分布 Fig. 9 The distribution of the momentumless wake under different guide vane angle
3.3 叶轮气动载荷分析

 Download: 图 11 导叶开度0°前缘载荷分布对比 Fig. 11 The aerodynamic load distribution at the leading edge of the impeller under 0° angle of guide vane

 Download: 图 12 导叶开度40°前缘载荷分布对比 Fig. 12 The aerodynamic load distribution at the leading edge of the impeller under 40° angle of guide vane
4 结论

1) 在压缩机运行过程中，由导叶产生的尾迹进而产生的动静干涉影响明显，本论文验证了在可调导叶上采用尾缘吹气是一种削弱尾迹强度，降低叶轮载荷是可行方式。

2) 在不同导叶开度下，以2%压缩机流量进行吹气，对压缩机的性能影响较小；在导叶开度为0°的情况下，分析不同流量下所产生的尾迹现象；而采用2%吹气同时可使导叶形成无动量亏损尾迹形式，使后续叶轮载荷降低，避免压缩机出现叶轮疲劳破坏具有积极意义。

3) 由于受导叶开度的影响，对于可调导叶，尾缘吹气有一定局限性。当开度增加时，气流壁面分离加重，叶轮中部所受载荷加大。为达到无动量亏损尾迹，相应的吹气量需要增加，但叶轮所受载荷并无明显削弱。当导叶开度增至50°以上时，尾迹现象已消失。