12-hole omni-directional probe for subsonic-speed and complex three-dimensional flow field measurement

Abstract

The invention discloses a 12-hole omni-directional probe for the subsonic-speed and complex three-dimensional flow field measurement. The 12-hole omni-directional probe comprises a pressure measuring head 1, a pressure measuring rod, an installation base 5, a positioning ring 6, a pressure measuring pipe 7 and a pressure mouthpiece 8. The pressure measuring rod is of a hollow structure and is composed of a first strut 3, a second strut 3 and a third strut 4. The pressure measuring head 1 is of a spherical structure and the diameter of the spherical structure is 5-30 mm. The spherical structure is machined through the electric spark molding step or the electrolytic molding step. 12 pressure measuring holes are arranged at 12 vertexes of a regular icosahedron in internal connection with the pressure measuring head 1. One end of the pressure measuring pipe 7 is connected with the pressure mouthpiece 8. The other end of the pressure measuring pipe 7 is connected with the pressure measuring head 1 after passing through the pressure measuring pipe 7. The pressure measuring head 1, the pressure measuring rod and the pressure measuring pipe 7 are connected together through the silver-based brazing process. One end of the pressure mouthpiece 8 is connected with the pressure measuring pipe 7. The other end of the pressure mouthpiece 8 is connected with a rear-end pressure scanning element so as to convert pressure signals into electric signals.

Description

Technical areas: [0001] The invention belongs to the field of subsonic flow field testing, and specifically relates to a 12-hole omnidirectional probe used for measuring subsonic complex three-dimensional flow fields. Background technique: [0002] In the measurement of aerodynamic flow field, it is necessary to measure the flow velocity and determine the direction of the flow velocity, such as free jet test, wind tunnel flow field quality calibration test, aeroengine high-altitude simulation test, gas turbine turbine blade trailing edge and wing Complex flow fields near the type, etc. [0003] At present, for the measurement of flow field velocity and direction angle, five-hole probes and seven-hole probes are mostly used. The maximum measurement airflow angle of the five-hole probe and the seven-hole probe depends on the geometry of the pressure measuring head and the position distribution of the pressure measuring holes. The airflow angle that can be accurately measured ...

AI Technical Summary

Problems solved by technology

[0004] Other flow field testing equipment, such as laser Doppler velocimetry (LDV) and particle imaging velocimetry (PIV), are expensive, complicated to use, and have high requirements for the use environment. It is difficult to measure many complex flow fields.

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