Schlieren method, also called schlieren skills, including black, aedes shadow method, colorful schlieren method and shaft; its flowerlike schlieren method, is with the schlieren apparatus system appeared on the flow field and the measurement of the most commonly used optical method.Schlieren method first put forward by Toepler in 1884, and use in refractive index of optical glass inspection.In 1952, Holde and Norht schlieren instrument system used on the white light dispersion prism, completed the colorful schlieren image, expand the scale of the use of schlieren skills;In 1962, Bland and pelick water were studied by using the schlieren method of pressure and temperature effects, points out that schlieren method practical appeared in the tunnel flow field;1974, Merzkirch schlieren skills of compressible flow field are classified and involved in the schlieren instrument system on do schlieren method discussion, containing grating meddle, prism meddle and Moire stripe meddle, are classified as schlieren skills, and received the recognition from the domestic peers. |
