Data processing method for five-hole probe

Abstract

The invention discloses a data processing method used for improving the application efficiency of a five-hole probe, and the method is a triple interpolation-based data processing method for the five-hole probe. The method comprises the steps of firstly, assuming a Mach number, taking Mach number, deflection angle and pitch angle calibration pressure coefficients as known variables, substituting probe calibration data, and obtaining a deflection angle and a pitch angle by adopting triple interpolation; secondly, taking the Mach number, the deflection angle and the pitch angle as known variables, and obtaining total pressure and static pressure characteristic coefficients separately by adopting the triple interpolation; thirdly, substituting an experimental measurement value and the total pressure and static pressure characteristic coefficients into total pressure and static pressure characteristic coefficient formulae, and performing calculation to obtain a total pressure, a static pressure and a Mach number; and finally, performing difference operation on the obtained Mach number and the assumed Mach number, and performing iterative computing until a difference value is smaller than a set precision value. According to the novel data processing method, the pressure data measured by a five-hole probe experiment can be quickly and conveniently converted into flow field velocity magnitude and direction, and the data interpolation precision can be improved.

Description

technical field [0001] The invention relates to the technical field of engineering measurement, and relates to a data processing method for improving the application efficiency of a calibrated five-hole probe. Background technique [0002] The five-hole probe measures the flow field, and can obtain the velocity, direction, total pressure, and static pressure of the measurement point in the flow field at the same time, and has the advantages of convenient operation and easy repeated measurement. [0003] There are three measurement methods for five-hole probes: opposite measurement method, semi-direct measurement method and non-direct measurement method. The opposite measurement method and the semi-antimetric measurement method have the characteristics of intuitive operation and less data processing, but it takes time to find the pressure balance between each pressure measuring hole. The non-contrasting measurement method is easy to operate, and the data can be collected dir...

AI Technical Summary

Problems solved by technology

In the former method, the method of successive dimensionality reduction is adopted, and the data processing process is cumbersome; in the second method, only the direction characteristic network under a single Mach number is considered when calculating the pitch angle and yaw angle, and the angle characteristic curve closest to The four-point calculation of , does not take into account the variation of different Mach numbers in the calibration data

Images