基于变马赫数的五孔探针三维插值方法

探讨了五孔探针气动数据的插值方法,为提高插值精度,开发了基于传统线性插值法的三维线性插值法。该方法把同一探针在不同马赫数下的校准图形成三维数据库,将实验数据通过三维图进行插值。并使用改进前后的两种插值方法分别对校准风洞测得的数据进行整理,对比结果证明:在实验工况连续变化的情况下,三维线性插值法在插值精度上要优于传统线性插值法。特别是在来流马赫数变化较大时,该方法可以改善单一校准文件处理造成的数据精度问题,可用于自动化流场采集系统,为流场高速高精度采集奠定基础。

Interpolation Method of Five-Hole Probe Based on Variable Mach Number

In order to improve the interpolation accuracy, the five-hole probe aerodynamic data interpolation method is discussed and a three-dimensional linear interpolation method based on traditional linear interpolation method is developed. The calibration graph of the same probe under different Mach numbers is formed into a three-dimensional database in this method, and the experimental data are interpolated through one three-dimensional graph. The two interpolation methods before and after the improvement are used to deal with the experimental data of a calibration wind tunnel respectively. The comparison results show that the three-dimensional linear interpolation method is superior to the traditional one on the interpolation precision under the condition of continuous changes in the experimental condition, especially when the incoming Mach number changes sharply. This method can improve the data accuracy compared with that using a single calibration file, and can be used in automatic flow field measurement system featured with high-speed and high-precision data acquisition.