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为了提高分析流场测量数据的精确度,根据气动探针标定曲线分布的特性,构造了相应的函数,并应用Akima发展的双变量表面平滑拟合法进行插值计算,给出了理论误差分析结果。分析表明:该方法应用在插值区间内外都能保证较高的精确度。然而,当由插值节点组成的插值表面出现明显的折点时,为减少系统误差,必须将整个插值区间划分为多个子区间,分别利用双变量表面平滑拟合法形成各自相应的插值函数。结合大量在试验风洞里四孔楔型气动探针的标定数据和试验数据进行分析,给出确定各个参量的误差,验证了该方法在实际气动探针测量应用中的适用性和有效性。图7表1参8
In order to improve the accuracy of the flow field measurement data, a corresponding function is constructed according to the characteristics of the calibration curve distribution of the aerodynamic probe. The two-variable surface smoothing method developed by Akima is used for interpolation calculation, and the theoretical error analysis result is given. The analysis shows that this method can guarantee higher accuracy both inside and outside the interpolation interval. However, when there are obvious turning points on the interpolation surface composed of interpolation nodes, in order to reduce the systematic error, the whole interpolation interval must be divided into several subintervals, and the respective interpolation functions are respectively formed by using two-variable surface smoothing fitting method. Combined with a large number of calibration data and experimental data of four-hole wedge-type pneumatic probe in the test wind tunnel, the error of each parameter is given and the applicability and effectiveness of this method in the actual aerodynamic probe measurement are verified. Figure 7 Table 1 参 8