管道效应对进气道试验湍流度测量的影响研究

徐彬彬; 巫朝君; 王学

doi:10.11729/syltlx20190118

管道效应对进气道试验湍流度测量的影响研究

doi: 10.11729/syltlx20190118

中国空气动力研究与发展中心低速空气动力研究所, 四川绵阳 621000

基金项目:

中国空气动力研究与发展中心风雷青年创新基金 PJD20190236

详细信息

作者简介:
徐彬彬(1988-), 男, 湖南衡阳人, 博士, 助理研究员。研究方向:低速风洞试验技术, 辐射流体力学。通信地址:四川绵阳空气动力研究与发展中心低速所(622662)。E-mail:xubb2010@163.com

通讯作者:
巫朝君 E-mail: 1244008706@qq.com

中图分类号: O351.2
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- 文章访问数: 205
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- 被引次数: 0
出版历程
- 收稿日期: 2019-09-06
- 修回日期: 2019-12-19
- 刊出日期: 2020-12-25

Research on the effect of tubing on turbulence in inlet wind tunnel test

Low Speed Aerodynamics Institute of China Aerodynamics Research and Development Center, Mianyang Sichuan 621000, China

摘要

摘要: 进气道风洞试验中，湍流度由动态压力计算得到，动态压力的测量是否精确与动态压力传感器前方导压通道的管道效应相关。基于管道内流体动力学耗散模型，研究了导压通道对动态压力和湍流度的影响，并通过进气道风洞试验进行了验证。研究结果表明：进气道风洞试验中导压通道的管道效应对湍流度的影响较明显，管道效应会放大动态压力的脉动幅值，导致测量湍流度大于真实湍流度。为了减小管道效应对湍流度的影响，进气道试验中应避免使用导压的方式进行动态压力的测量。如果不可避免地存在导压通道时，在导压通道长度大于5 mm时，须考虑管道效应对湍流度测量的影响，并进行相应的修正。
- 耗散模型 /
- 湍流度 /
- 进气道试验 /
- 管道效应 /
- 动态压力
Abstract: Turbulence can be calculated through the fluctuating pressure in the inlet wind tunnel test. The accuracy of the fluctuating pressure measurment depends on the tubing ahead of the fluctuating pressure sensors. In this paper, the effects of tubing on turbulence are researched based on the dissipation model of dynamics and are verified by the inlet wind tunnel tests. The research results show that the tubing ahead of the sensor has a serious effect on the turbulence. The amplitude of the fluctuating pressure increases and the measured turbulence is magnified when the effect of tubing exits. In order to eliminate the error brought by the tubing, the way using tubing to measure fluctuating pressure should be avoided in the inlet wind tunnel test. If the tubing is inextricably used in test and the length of tubing is more than 5 mm, the final fluctuating pressure data should be revised.
- dissipation model /
- turbulence /
- inlet test /
- tubing effect /
- fluctuating pressure

HTML全文

图 1 进气道试验中典型动态压力测量耙示意图

Figure 1. The schematic of fluctuating pressure rake in inlet test

下载: 全尺寸图片幻灯片

图 2 动态压力传播示意图

Figure 2. The schematic of the spread of fluctuating pressure in tube

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图 3 不同通道长度l₀时|H(ω)|在频域上的曲线

Figure 3. The curves of |H(ω)| in frequency domain for different l₀

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图 4 不同通道半径r₀时|H(ω)|在频域上的曲线

Figure 4. The curves of |H(ω)| in frequency domain for different r₀

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图 5 动态压力脉动幅值

Figure 5. The curve of fluctuating value for pressure

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图 6 r₀=0.85 mm时，湍流度放大倍数随通道长度的变化曲线

Figure 6. The curve of Tu_B/Tu_A in inlet test for r₀=0.85 mm and different l₀

下载: 全尺寸图片幻灯片

图 7 不同导压通道长度和内半径r₀时, 湍流度放大倍数云图

Figure 7. The contour of Tu_B/Tu_A for different r₀ and l₀

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图 8 试验中4个位置动态压力脉动幅值Δp₁(ω)~Δp₄(ω)的频域值

Figure 8. The value of Δp₁(ω)~Δp₄(ω) in frequency domain for the four sensors

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图 9 湍流度放大倍数的理论和试验结果

Figure 9. The curves of Tu_B/Tu_A for the results of theory and the experiment

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图 10 管道效应理论修正后的湍流度放大倍数

Figure 10. The correcting value of Tu_B/Tu_A for the results of experiments with tubing effect

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表 1 2组试验湍流度结果

Table 1. The value of turbulivity for the two inlet tests

湍流度	第一组试验	第二组试验				放大倍数Tu_B/Tu_A
湍流度	l₀=0 mm	l₀=0 mm	l₀=8 mm	l₀=18 mm	l₀=28 mm	放大倍数Tu_B/Tu_A
Tu₁	0.0226	0.0229	-	-	-	1.01
Tu₂	0.0260	-	0.0348	-	-	1.34
Tu₃	0.0226	-	-	0.0733	-	3.25
Tu₄	0.0187	-	-	-	0.0653	3.50

下载: 导出CSV

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