Supersonic aerodynamic unit AR-2
Working channel dimensions: length – 450mm, width – 70mm, height – 100 mm.
Range of velocities (Mach number): 1,7-3,5;
Reynolds Number on the line l=100mm: 1,0*100000 to 1,0*1000000
Air temperature in the forechamber: 285-295K
Duration, min: continuous
Description. Aerodynamic unit AR-2 is used for experimental
research of heat and mass exchange processes in a model boundary layer,
flown over by supersonic air stream.
The main part of the unit is supersonic aerodynamic tube of continuous
action with regulated plate nozzle, rectangular cross-section of the
working part 100x70 and with regulated exit cone. Length – 7,5 m, width
– 1 m, height – 2 m.
Unit Characteristics. Unit AR-2 is a supersonic aerodynamic
tube with a regulated supersonic nozzle and an exit cone. Air supply
by maximum pressure 0,8 MPa (8 atm) in the unit is provided by gasholder
battery and by compressor station of Institute of Mechanics. Maximum
flow rate through the unit (about 10 kg/s) does not exceed nominal compressor
station capacity, providing unlimited working unit time and record all
parameters at stationary heat operations, that is especially important
for quantitative researches of heat exchange in supersonic flow.
Unit AR-2 is equipped with supersonic plate plane regulate nozzle. By
means of this nozzle one can change the flow velocity directly during
the experiment in the working part, corresponding Much number from 1,7
to 3,5. Reynolds numbers, calculated for l=100 mm, correspond with range
100000-1000000. The boundary layer thinness on the nozzle exit is about
6 mm.
Equipment. The unit AR-2 is equipped with air injection
system in model boundary layer. Air is supplied into it from high-pressure
main (15 MPa) through distributive collector, reducers and flow rate
measuring devices. Injection system makes it possible to inject air
or other gas into separated model parts, with flow rate and gas temperature
being regulated separately in each of them.
The unit AR-2 is equipped with a IAB-451, a high-speed video camera,
an infrared window ZnSe, a thermal image camera, an ADC National Instruments,
pressure sensors IKD, software was designed in the application package
Labview 7.0, Intel Pentium IV computer.
Experimental research carried out on the supersonic aerodynamic unit AR-2
1. “Porous” cooling efficiency of surfaces flown by supersonic airflow
2. “Gas curtain” efficiency
3. Effect of “vortex-forming” relief flown over by supersonic
airflow on the equilibrium wall temperature and on the heat transfer coefficient.
