Abstract
It is said that starting characteristics of supersonic wind tunnel depend on the blockage ratio. However, analytical correlation for the blockage ratio generally disagree with experimental results. We performed wind tunnel tests and numerical simulations with flat plate and cylindrical models to investigate the effects of blockage ratio, model length, and 2nd throat area for JAXA 1m by lm Supersonic Wind Tunnel (SWT1). It was found that the starting limit depends on model length at some test conditions due to total pressure loss as well as blockage ratio. It was also shown importance of 2nd throat configurations in the blow down supersonic wind tunnel.
