The Schlieren apparatus allows students tosee density gradients as variations in intensity of illumination. This allowsthem to see supersonic air flow patterns around models. A monochrome Schlieren apparatus for use with theIntermittent Supersonic Wind Tunnel. The apparatus includes digital imaging equipment to record the images this isuseful when using an intermittent supersonic wind tunnel. The video monitor isparticularly useful to display the images to groups of students. It also clearly showsshock waves and expansions, and students can compare their positions and angleswith values predicted by theory. The imagingequipment can capture still images and any real-time changes in the image. The mirrors and lenses are of high optic standards to reduce any possibility of optic distortions of the images.
....
Supersonic flow and the occurring shock waves can be directly observed with the supplied Schlieren optic apparatus. The continuous operation can allow enough time to take measurements and to observe the phenomena. This an open, continuously operating supersonic wind tunnel with a rectangular measuring section. Transonic and supersonic flows from Mach 0.8 up to Mach 1.8 can be realized with interchangeable measuring sections and nozzle profiles. The tunnel is driven by a vacuum pump (included). The pump is effectively silenced so it can be placed in the same room as the wind tunnel. Four aerofoil models are supplied: a wedge, a double wedge, a bullet and a rocket. A flow straightener at the inlet ensures a low degree of turbulence.
....
Interchangeable walls in the measuring section produce velocities up to Mach 1,8
Drag bodies: rocket, projectile, double wedge and wedge
Investigation of pressure curves in supersonic flow
Visualisation of Mach lines and shock waves using Schlieren optics
Positive displacement fan with variable speed
Manometer for displaying the pressure in the measurement point
Continuously operating, open supersonic wind tunnel, low pressure principle.
