火箭发动机燃气射流流场的光学显示方法研究

本文研究了两种用于真实固体火箭发动机燃气自由射流流场和射流冲击流场显示的光学方法。实验结果表明 ,等厚条纹型 F- P干涉法。能够用于燃气自由射流流场的显示 ,而莫尔偏折法除此之外还可用于大范围的燃气射流冲击流场的显示。由此解决了长期以来无法显示这种高温、高压、强冲击、强火焰光等恶劣环境条件下的流场问题

STUDY OF OPTICAL VISUALIZATION METHODS FOR EXHAUST JET OF ROCKET ENGINE

Two optical methods are studied which are used to visualize the flow field of exhaust free jet and jet impingement from a real solid rocket engine.One is equal thickness fringe F P interferometry which is constructed with two mirrors about 200mm in diameter.It features that the optical layout is co optical light path and seperated form,the distance between two mirrors is more than 20m and the resistance to vibration distortion is strong.Another is moire deflectometry which has an aperture over 400mm in diameter.In this method a big diameter collimated light beam is used to explore the flow field,then it is reduced and recollimated into a small diameter recollimated light beam and detected by a two gratings system to produce moire fringes.It is characterized by large aperture and simplicity of the method.The experimental results show that the equal thickness fringe F P interferometry can be used to visualize the flow field of the exhaust jet from a real solid rocket,and the moire deflectometry can be even used to visualize the extensive flow field of rocket exhaust jet impingement besides the exhaust free jet.