Vacuum-Driven Transonic Wind-Tunnel at the Government Mechanical Laboratory

In this report, the construction and the performances of the vacuum-driven transonic wind-tunnel at the Government Mechanical Laboratory were described and some experimental results obtained were also shown. The test section of the wind-tunnel has rectangular cross section and its height and breadth are 20cm and 25cm respectively. When the partly open walls with adequate opening ratios are used as the top and bottom walls of the test section, uniform and steady flow can be obtained in it for over 30 sec. in the Mach number range 0.6∼1.3. Some supersonic nozzles designed for Mach numbers 1.3, 1.4, 1.56, 1.7, 1.86, and 2.0 are installed also. In the transonic region, the force measurements of the spheres with various diameters and of the tapered wing with NACA 65A 006 section were performed. And the positions of detached shock waves ahead of spheres were observed. The static pressure distribution over the surface of double wedge airfoil with thickness ratio of 10% were measured also. These experimental results were compared with the reliable data obtained by other authors and their agreements seemed to be good.