Schlieren without Knife-edge

Abstract

The present work is about a very low-cost Schlieren setup for compressible flow visualization especially high-speed jets. The conventional Schlieren setups employ knife-edge for chopping of rays. The specialty of the setup is that it does not employ a knife-edge for chopping off the deflected rays. The chopping off is achieved by a lens of the DSLR camera used for recording the images resulting from Schlieren Visualization process. The flow field of a supersonic jet from a convergent nozzle is used to check the visualization outcomes. The method is found to be cost effective and yields best results for jet flow visualization. The present method can be employed by students and research scholars for their research studies.