Large-aperture schlieren system suitable for test section of wind tunnel

Abstract

The invention relates to a large-aperture schlieren system suitable for a test section of a wind tunnel, and aims to solve the problems of degradation in system sensitivity and background illuminanceuniformity and high cost due to the adoption of large window glass in an existing schlieren observing system. The system comprises a light source system, a pre-sealing viewing window, a collimation main reflecting mirror, a schlieren system, a schlieren main reflecting mirror, an after-sealing viewing window and an imaging system, wherein the schlieren system comprises a pre-sealing schlieren lenscone, a test cabin and an after-sealing schlieren lens cone which are arranged in sequence; the pre-sealing viewing window is arranged on a side face of the pre-sealing schlieren lens cone; the after-sealing viewing window is arranged on a side face of the after-sealing schlieren lens cone; light rays of the light source enter the collimation main reflecting mirror by passing through the pre-sealing viewing window; and the light rays passing through the collimation main reflecting mirror enter the test cabin by passing through the pre-sealing schlieren lens cone, enter the schlieren main reflecting mirror through the after-sealing schlieren lens cone after passing through the air flow in the test cabin, are reflected by the schlieren main reflecting mirror, and enter the imaging system after passing through the after-sealing viewing window.

Description

technical field [0001] The invention relates to a schlieren observation system in the technical field of aerodynamic optics, in particular to a large-diameter schlieren system suitable for a wind tunnel test section. Background technique [0002] The schlieren observation system uses the principle that the refractive index gradient of light in the measured flow field is proportional to the airflow density of the flow field, and converts the change of the density gradient in the flow field into the change of the relative light intensity on the recording plane, so that the flow field density change area becomes Observable, distinguishable images, which are recorded. In the wind tunnel test, the Schlieren system is widely used to display the flow field structure of the wind tunnel model, and to test the variation characteristics of the flow field density in the test area. It has the characteristics of simple operation and high stability. [0003] With the development of modern...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing schlieren observation system uses large window glass, which leads to the decrease of the sensitivity of the schlieren system and the uniformity of background illumination and high cost, and provides a large-diameter schlieren system suitable for the wind tunnel test section

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