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Schlieren image processing method for compression corner supersonic flow field structure

A supersonic and schlieren technology, applied in the testing of machines/structural components, measuring devices, instruments, etc., can solve the problems of complex operation, high construction, maintenance and maintenance costs, etc., and achieve simple construction, high reliability and fast speed Effect

Active Publication Date: 2021-08-31
AIR FORCE UNIV PLA
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  • Abstract
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  • Application Information

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Problems solved by technology

Although supersonic PIV and other testing methods are more accurate in testing the separation area, their construction, maintenance and maintenance costs are high, and the operation is very complicated

Method used

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  • Schlieren image processing method for compression corner supersonic flow field structure
  • Schlieren image processing method for compression corner supersonic flow field structure
  • Schlieren image processing method for compression corner supersonic flow field structure

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Embodiment Construction

[0032] The accompanying drawings are for illustrative purposes only and should not be construed as limitations on this patent; in order to better illustrate this embodiment, certain components in the accompanying drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art Therefore, it is understandable that some well-known structures and descriptions thereof may be omitted in the drawings.

[0033] The accompanying drawings are for illustrative purposes only and should not be construed as limitations on this patent; in order to better illustrate this embodiment, certain components in the accompanying drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art Therefore, it is understandable that some well-known structures and descriptions thereof may be omitted in the drawings.

[0034] like figure 1 As shown, the present invention provide...

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Abstract

The invention discloses a schlieren image processing method for a compressed corner supersonic flow field structure. The method comprises the following steps: acquiring a schlieren video; performing video framing operation and image selection; calculating a refractive index gradient; carrying out rms convergence judgment; calculating root-mean-square distribution of the schlieren intensity field; and judging the size and position of the separation area. According to the method, the structure pulsation change level of the supersonic flow field is obtained, so that the size visual quantitative measurement and the position judgment of the separation area are realized.

Description

technical field [0001] The present invention relates to the technical field of supersonic flow field diagnosis, and more particularly, relates to a schlieren image processing method for supersonic flow field structures in compression corners. Background technique [0002] Flow separation is an extremely important problem in the field of supersonic flow, and it is of great significance to the judgment, prediction and diagnosis of the size and position of the separation zone. Accurate, real-time, and rapid measurement of flow field structure is achieved through non-contact means, and it is widely used in aerospace, military and other fields. The research on the measurement method of the size of the separation zone has always been a hot issue in the field of supersonics at home and abroad. Non-contact flow field diagnosis methods are generally divided into two categories: one is through the parallel beam through the compressible supersonic flow field, the light velocity is def...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/06
CPCG01M9/067Y02T90/00
Inventor 甘甜吴云金迪宋慧敏贾敏梁华
Owner AIR FORCE UNIV PLA
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