One of the facilities that the HORIZON group has available for use is the low-enthalpy blowdown wind tunnel. This facility was updated in March 2016 with an in-house designed and manufactured Mach 2 nozzle. The test section has a constant cross-section of 8 in x 8 in with air as the test gas compressed to nominally 20 MPa. The plenum pressure is maintained at approximately 240 kPa. The freestream velocity and Reynolds number are 507 m/s and 3.0 x 107 m-1, respectively. Although previously used for duct flow experiments, the HORIZON team uses the tunnel for diagnostic testing and for shock-boundary layer interaction research. These images show our Schlieren and particle image velocimetry (PIV) diagnostic setups.
Shown below are Mach number (left) and numerical Schlieren (right) contours for the Mach 2.01 High-Speed Wind Tunnel used for these experiments. These are streamwise-transverse views.
Shown below is a close up of the test section.