In the field of engineering thermal physics and fluid mechanics, applied optics appeared technology research airflow velocity field and concentration field, temperature field is very important, which apply throughout the schlieren apparatus.Shadow instrument is to use the index of refraction of light in the flow field gradient is proportional to the basic principle of the flow field of air density of measurement, it is widely used in observation within the boundary layer, burning, shock wave, gas flow of cold and heat convection and wind tunnel and tunnel flow field.Basic principle and improve planning thinking:Schlieren method is with a blade cut as light source.Announced by the light of a beam of parallel light, through the airflow uneven density of test section, the light deflection, located at the focal point of the blade cut light source as the extent and the flow field of refraction. |
