Correction method for the effect of tube on the measurements of fluctuation total pressures in inlet
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摘要:
进气道实验需要测量进气道出口截面的动态总压，当动态压力传感器与测点之间存在管道时，动态总压测量值与真值之间存在较大误差，进而会影响进气道出口截面湍流度的测量精度。通过在中国空气动力研究与发展中心涡轮动力模拟器校准箱的实验，系统地研究了管道对动态总压和湍流度测量的影响。实验结果表明：管道对动态总压和湍流度测量的影响非常严重，动态总压脉动量频域值可被放大10倍以上，湍流度可以放大2.8倍以上。基于修正耗散模型，通过实验结果对修正耗散模型进行了标定，并提出了动态总压管道影响修正方法，修正方法能够有效减小管道所引起的测量误差。
Abstract:The fluctuation total pressures in aerodynamic interface plane need be measured in inlet experiments. The tube between the pulsating pressure sensor and the measurement point may lead to larger error between the measurement value and the truth value, and also generate larger effect on the measurement of the turbulence. The experiments in Turbine Power Simulation calibration tank of China Aerodynamics Research and Development Center were performed to research the effect of tube on the measurement of fluctuation total pressure and the turbulence. Experiment results showed that the effect of tube seriously affected the measurement of the fluctuating total pressure and the turbulence. The value of fluctuating total pressure in frequency can be magnified more than 10 times and that of turbulence can be magnified more than 2.8 times. A correction method based on the improved dissipation model was proposed and calibrated, which can effectively reduce the measuring error brought by the tube.
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Key words:
- wind tunnel experiments /
- fluctuation total pressure /
- turbulence /
- effect of tube /
- correction method
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图 2 TPS校准箱示意图和实物图
Figure 2. Schematic diagram and real picture of TPS calibration tank
图 3 Test A与Test B实验传感器安装示意图
Figure 3. Schematic diagram of installation site of sensor for Test A and Test B
图 4 测量截面流量与马赫数的重复性
Figure 4. Repeatability of Mach number and rate of flow in the measurement plane
图 5 Ma=0.72时的总压恢复系数分布重复性
Figure 5. Repeatability of total pressure recovery coefficient at Ma=0.72
图 6 脉动压力频域值的重复性(Ma=0.72)
Figure 6. Repeatability of fluctuating pressure in frequency (Ma=0.72)
图 7 不同长度下管道的FRF （Ma=0.32，d=1.8 mm）
Figure 7. FRF of tube at different length （Ma=0.32，d=1.8 mm）
图 8 不同管道内径下的FRF （Ma=0.72，l0=40 mm）
Figure 8. FRF of tube at different inner diameter （Ma=0.72，l0=40 mm）
图 9 不同Ma下管道的FRF （l0=40 mm，d=1.8 mm）
Figure 9. FRF of tube at different Ma （l0=40 mm，d=1.8 mm）
图 11 验证实验Ma=0.47时总压恢复系数
$ \sigma $ 分布重复性Figure 11. Repeatability of total pressure recovery coefficient
$ \sigma $ of measurement section at Ma=0.47 for verification experiments
图 12 动态总压频域修正效果
Figure 12. Correction effectivity for the frequency domain values of pulsating total pressure
表 1 实验内容表
Table 1. Contests of experiment
项目 管道尺寸 Pt1 Pt2 Pt3 Pt4 Pt5 Pt6 Pt7 Pt8 Test B l0/mm 40 30 20 10 5 0 24 0 d/mm 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8 
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表 2 无管道与有管道湍流度对比
Table 2. Comparison of turbulence with tube and without tube
马赫数 d/mm l0/mm 无管道TuA 带管道TuB TuB/TuA 0.32 1.8 40 0.004 0.011 2.8 0.72 1.8 40 0.005 0.012 2.4 0.32 1.6 40 0.004 0.008 2.0 0.72 1.6 40 0.005 0.011 2.2 0.32 1.2 40 0.004 0.006 1.5 0.72 1.2 40 0.005 0.009 1.8 0.32 1.8 30 0.013 0.030 2.2 0.72 1.8 30 0.033 0.071 2.2 0.32 1.6 30 0.013 0.031 2.4 0.72 1.6 30 0.033 0.069 2.1 0.32 1.2 30 0.013 0.028 2.1 0.72 1.2 25 0.033 0.060 1.8 0.32 1.8 25 0.015 0.033 2.2 0.72 1.8 25 0.039 0.076 2.0 0.32 1.6 25 0.015 0.031 2.1 0.72 1.6 25 0.039 0.078 2.0
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表 3 无管道和有管道修正后湍流度值
Table 3. Turbulence with tube effect and the corrected turbulence
马赫数 d/mm l0/mm 无管道TuA 有管道TuB 修正值$T^*_{\rm{u}} $ TuB /TuA $T^*_{\rm{u}} $‒TuA 0.47 1.2 40 0.0119 0.0261 0.0112 2.19 −0.0007 0.58 1.2 40 0.0166 0.0360 0.0163 2.17 −0.0003 0.58 1.8 40 0.0166 0.0394 0.0171 2.37 0.0005 0.58 1.6 40 0.0166 0.0360 0.0163 2.17 −0.0003 0.58 1.2 40 0.0166 0.0296 0.0157 1.78 −0.0009 0.58 1.6 30 0.0201 0.0489 0.0193 2.43 −0.0007
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