This study aims to conduct simple free flight tests to elucidate the shock waves generated around objects. We will attempt to visualize the shock waves generated around objects using free flight tests in an extreme supersonic shock tunnel. The experimental conditions will be a steady flow at Mach number 5, and we will use the Schlieren method for visualization, capturing images with a high-speed camera to visualize the flow around the object. First, visualization and computational fluid dynamics analysis were performed using free-flight tests with a sphere model. Next, three sphere models were flown in free flight, and visualization and computational fluid dynamics analysis were performed using free-flight tests. By comparing the visualization results and analysis results, we attempted to confirm the validity of the data obtained from free-flight tests using a hypersonic shock tunnel. The results of the experiment enabled visualization of the flow around the sphere model, and the validity of the visualization results was confirmed by comparison with the analysis results. Additionally, in an experiment using three sphere models, visualization of the flow around the sphere models and the interference of shock waves was similarly achieved, and the validity of the visualization results was confirmed by comparison with the analysis results.
TAKAGI et al. (Wed,) studied this question.