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

A three-dimensional flow field and subsonic technology, which is applied in the direction of measuring devices, machine/structural component testing, instruments, etc., can solve problems such as complex use methods, difficult flow field measurement, and high requirements for the use environment

Inactive Publication Date: 2016-05-18
CHINA GAS TURBINE ESTAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 e...

Method used

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

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specific Embodiment approach

[0022] The specific implementation of the 12-hole omnidirectional probe designed by the present invention includes four steps: theoretical analysis, engineering design, calibration and use method:

[0023] 1 Theoretical analysis

[0024] Firstly, through theoretical calculation and simulation, determine the flow characteristics of this type of 12-hole omnidirectional probe under different velocities and flow field angles, such as pressure and temperature range. At the same time, prepare for the selection of speed and direction angle range in the calibration process.

[0025] 2 Engineering design and processing

[0026] 1) Select the size of the pressure measuring head according to the test object, and then design the diameter of the pressure measuring hole according to the material characteristics and processing technology;

[0027] 2) Select the material and size of the air pipe according to the theoretical analysis pressure and temperature range;

[0028] 3) Determine the...

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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 field: [0001] The invention belongs to the field of subsonic flow field testing, in particular to a 12-hole omnidirectional probe used for subsonic complex three-dimensional flow field measurement. Background technique: [0002] In the measurement of aerodynamic flow field, it is necessary to measure the magnitude of the flow velocity and determine the direction of the flow velocity, such as free jet flow test, wind tunnel flow field quality calibration, aeroengine high-altitude simulation test, gas turbine blade trailing edge and wing The complex flow field near the model, etc. [0003] At present, five-hole probes and seven-hole probes are mostly used for the measurement of flow field velocity and direction angle. The maximum airflow angle measured by 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, and the airflow angle that can be accurately measur...

Claims

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Application Information

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IPC IPC(8): G01M9/06
CPCG01M9/06
Inventor 张有吴锋尹骥冯旭栋杨桥
Owner CHINA GAS TURBINE ESTAB
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