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介绍了七孔探针用于亚音速可压缩流的标定方法。作为一种可以同时获得流动速度大小、流动偏角、总压和静压的气动测量装置,七孔探针被广泛应用于各种流动测量,包括可压缩流动。但是它的校准过程周期很长,代价昂贵,影响了探针的推广。本文以数值计算为手段,对七孔探针进行亚音速可压缩流校准与测量的研究。结果表明,其校准拟合精度流动角为2%,内外区的总静压相对标准偏差都没有超过3%,高于相同状态下的实验校准精度。在实际应用中,本方法用于指导传统实验标定方法,可以节约大量的标定时间和成本,使七孔探针在亚音速可压缩流的测量变得简单可行。
A seven-hole probe is introduced for the subsonic compressible flow calibration method. As a pneumatic measuring device that enables the simultaneous determination of flow velocity, flow angle, total pressure and static pressure, the seven-hole probe is widely used for various flow measurements including compressible flow. But its calibration cycle is long and costly, affecting the promotion of the probe. In this paper, numerical calculation as a means of subsonic subsynchronous compressible flow calibration and measurement of seven-hole probe. The results show that the calibration fitting accuracy of the flow angle is 2%, the relative standard deviation of the total static pressure inside and outside the area no more than 3%, higher than the experimental calibration accuracy under the same conditions. In practice, this method is used to guide the traditional experimental calibration method, which can save a lot of calibration time and cost, making the measurement of subsonic compressible flow of seven-hole probe simple and feasible.