This wind tunnel was designed and manufactured in the Institute of Thermomechanics CAS at the end of 1970. It has a contraction 28, and a closed test section 0.1 x 0.1 m2 x 2.2 m with controlled suction from three walls (side walls and bottom), and the polished upper wall has flush-mounted inserts for boundary layer and hot-wire probes.
Velocity in the test section is controlled by a throat at the end of the section, and by controlled suction from the side walls; from the lowest value of 0.1 m/s to M ~ 0.8. Turbulence level is about 0.15% at velocities under 60 m/s. Fluctuations of the static temperature and pressure are of the order of 10-2 and 10-3 percent, respectively.
A set of turbulence grid generators at the test section entrance makes it possible to reach the turbulence intensities up to 12% (homogeneous, close to isotropic, up to 100m/s), or 3% for M ~ 0,7 , with the structure close to that in turbomachines. With a slight modification of the sonic throat it is possible to generate periodic pulsations in the test section up to the frequency of 500 Hz.
The wind tunnel is designed for:
- development of the methodology of CTA measurements at changing flow temperatures, in close proximity of the walls, at high subsonic velocities (Ma >0.5), and at large temperature gradients. This methodology has already been used in experimental investigations of a fundamental character, in measurements on actual turbomachines (power plant steam turbines, industrial compressors), and in modelling the smoke trails, etc..
- fundamental research into processes and phenomena in shear flows (boundary layers, mixing layers, separated flows), and in investigations of the transition to turbulence in internal flows.
The high-speed wind tunnel for turbulence and boundary layer research.
