Reflective type high-speed camera shooting schlieren system applied to constant volume combustion bomb and capable of correcting chromatic aberration

Abstract

The invention discloses a reflective constant-volume incendiary bomb high-speed camera schlieren system capable of correcting chromatic aberration, which comprises a light source, an optical fiber, a condenser lens group, a slit device, a first reflector, a collimating mirror, a constant-volume Incendiary bomb, schlieren mirror, second reflector, knife edge and high-speed camera, the optical input end of the optical fiber is connected to the light source, the optical output end of the optical fiber is connected to the condenser lens group, and the focus of the condenser lens group is connected to the collimating lens The focal points reflected by the first reflecting mirror coincide at the slit device, and the knife edge is located at the focal point of the schlieren mirror reflected by the second reflecting mirror. The present invention adopts the condenser lens group to improve the existing condenser lens, and corrects the chromatic aberration produced by the polychromatic light after passing through the lens, so that the real spherical flame propagation photos in the constant-volume incendiary bomb can be obtained more accurately.

Description

technical field [0001] The invention relates to a reflective schlieren system, in particular to a reflective constant-volume incendiary bomb high-speed camera schlieren system capable of correcting chromatic aberration. Background technique [0002] The constant-volume incendiary bomb is an experimental device that simulates the combustion process of the cylinder piston in the engine close to the top dead center. The high-speed schlieren system utilizes the different density of the fluid in the constant-volume incendiary bomb when the fuel burns to produce different refraction effects on the passing light. The parallel light is refracted in the constant volume incendiary bomb through the glass window at one end and passes through the glass window at the other end, finally enabling the high-speed camera to capture the process of spherical flame propagation in the constant volume incendiary bomb. [0003] The traditional reflective constant volume incendiary bomb high-speed ca...

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Problems solved by technology

[0003] The traditional reflective constant volume incendiary bomb high-speed camera schlieren system uses halogen tungsten lamp or xenon lamp as the light source, which consumes a lot of power and produces a lot of heat. If the heat dissipation is not good, it is easy to light decay, which makes the output light effect unstable. Experimental accuracy, and the high heat generated at the same time will easily deform the condenser lens behind and affect the experimental accuracy

In addition, since the light sources used in the laboratory are all polychromatic light, the condenser lens in the traditional reflective constant volume incendiary bomb high-speed camera schlieren system uses a spherical convex lens. The difference in refractive index will cause chromatic aberration, so that the outermost circle of light will have a colored aperture. When studying the laminar burning speed of a spherical flame in a constant volume bomb, it is necessary to measure the radius of the final spherical flame image projected on the high-speed camera , if chromatic aberration occurs during refraction, the radius of the spherical flame captured by the final high-speed camera through the schlieren system will deviate from the radius of the spherical flame in the real experiment in the constant volume incendiary bomb, so the final calculated spherical flame propagation The parameters will also deviate from the parameters of the real spherical propagating flame

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