This paper describes a new visualizing method of streamlines around models in hypersonic flows by using an electrical discharge. First, the visualization of a streamline around a wedge is carried out. The result shows that the visualized streamline in the shock layer is approximately parallel to the wedge surface. The theoretical streamline is considered to be parallel to the wedge surface. From this, it is proved that the new method is available for the visualization of streamlines around hypersonic vehicles. Moreover, the visualization of a streamline around a more complicated model shape is carried out, successfully.
This study utilizes computer aided design graphic simulation in the image processing of visualized streamlines for the jet flow through a nozzle into the atmosphere. The flow is assumed to be two-dimensional, incompressible, steady and laminar. The combination of this simulation modelling with the image processing technique proved to increase the efficiency of data processing and results in many aspects. Distributions of flow velocity, vorticity and pressure are calculated using a streamline coordinate system for governing equations. The results of CAD simulation are then compared with those obtained in applying direct image processing technique (conventional simulation) and with numerical ones for various Reynolds numbers and channel angles.