The optical equipment complex for the diagnostics of high-velocity gas and two-phase flows.
The gas and fluid test bench with high repetitiveness of modes and flow parameters is used for the adjustment and tests of the optical diagnostics methods.
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measurement of the local velocity of the gas and disperse phases by the laser-Doppler anemometry (LDA) method with the direct spectral analysis has been developed on the base of the static multiple path Fizeau standard (developed in ITAM SB RAS).
Shock wind tunnel UТ-4М
The purpose is analysis of major physical regularities of the interaction between shock waves and liquid and solid particles related with acceleration, deformation, atomization, evaporation, ignition an combustion of drops and solid particles in the relaxation zone behind the shock wave front.
Shock wind tunnel parameters:
КВД and КНД length is 0.8 and 5 m; electrically controlled pneumatic valve;
test section channel cross section is 5252 mm2; the process gases are air, oxygen;
the initial pressure P = 0.01 – 0.1 MPa; the pushing gas is air, helium at Р = 0.8 – 10 MPa; shock wave Mach number range is М = 1.1 – 4.5.
Optical diagnostics of fast processes
To provide the ultimate spatial (~10 m) and temporal (~10 – 8 s) resolution of the optical schematic of visualization, the method of flash filming is used; it means that the exposure extent, frame count and rate are controlled by the light source, and the optical-mechanical photo-recorder is used for the spatial frame separation.
The stroboscopic light source is the base unit in the complex; it is based on the ruby
Laser with the Q-switching (developed in ITAM SB RAS).
Stroboscope parameters:
wavelength is 0.694 um; mpulse number from 1 to 50; impulse duration is ~ 30 – 50 ns; inter-impulse gap is from 10 to 100 microseconds in 1 microsecond with the instability of ±0.1 microseconds; synchronization accuracy is ±0.1 microseconds; impulse energy is ~0.05 J.
The fast trigged photo recorder with a revolving mirror polygon records the images on a high-resolving photo film 35 mm wide, the sizes of the exposed area are 24x260 mm2. The frame size, frame count and gaps between them, with due regard to the duration of permanent parameters behind the shock wave front are chosen in virtue of the optimal spatial and temporal resolution.