Influence study of flow angularity on measuring device in wind tunnel flow field calibration
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摘要:
为确定排架设计参数对低速风洞流场校测中方向场局部气流偏角的影响,采用数值模拟与试验对比验证的方式进行了研究,证明当前所采用的方法能够对排架设计参数进行有效评估。采用该数值模拟方法,针对排架的阻塞度、偏离试验段轴线距离、安装角度以及方向场探针的长度等参数,对局部气流偏角测量的影响进行了分析,得到了影响规律,并建立了影响模型。结果表明:排架的阻塞度、排架偏离试验段轴线距离以及方向场探针的长度对局部气流偏角的测试影响明显;如排架气动尺寸或测试方法设计不当,将导致测试结果与真实结果差异较大,得到错误的风洞方向场品质的评估结果。
Abstract:In order to determine the influence of flow angularity on design parameters of measuring device in low speed wind tunnel flow field calibration, wind tunnel experiment and numerical simulation were conducted to prove the feasibility of the adopted method of assessment. Numerical simulation method was carried out to study the influence of local flow angularity on measuring device blockage, offset, angle of attack and probe length. The law of influence was obtained and the mathematical model of influence was established. The results showed that: the angle of attack, the offset of measuring device and the length of probe have obvious influence on the local flow angularity experiment results, if the measuring device or test method was not properly designed, the error of flow angularity test results could be too large, even leading to wrong experimental conclusion about flow angularity.
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Key words:
- low speed wind tunnel /
- flow angularity /
- measuring device /
- influence /
- flow field calibration
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