Purdue has opened a new hypersonic research / test facility which includes the only quiet Mach 8 wind tunnel in the world. The facility also includes a HYPULSE tunnel that uses a shock wave of high-temperature air to recreate specific hypersonic flight conditions. It allows flight simulations at speeds ranging from Mach 5 to as high as Mach 40.
Edit: According to the link,
Edit: According to the link,
Quiet wind tunnels more closely simulate flight and provide more accurate data than conventional hypersonic wind tunnels. A better understanding of when and how airflow over a surface changes from smooth to turbulent is essential in the successful design of expendable and reusable hypersonic vehicles. Purdue currently is home to one of only two working Mach 6 quiet tunnels in the country.