2014 2(15)

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Pages:

33 - 38

Language:

RU

Ref.:

10


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2014_2(15)_7.pdf

 

 

EXPERIMENTAL STUDY OF PRECESSING VORTEX IN TWO-PHASE SWIRLING FLOW

Alekseenko S.V.1,2, Vinokurov A.P.1,2, Shtork S.I.1,2

1 Institute of Thermophysics SB RAS, Novosibirsk, Russia
2 Novosibirsk State University, Novosibirsk, Russia


Citation:

Alekseenko, S.V., Vinokurov, A.P. and Shtork, S.I., (2014) Experimental study of precessing vortex in two-phase swirling flow, Modern Science: Researches, Ideas, Results, Technologies, Iss. #2(15), PP. 33 - 38.


Keywords:

precessing vortex core; multiphase flow; swirling flows; nonstationary vortical structures


Abstracts:

The work is devoted to experimental study of precessing vortex in gas-liquid highly swirled flow. Visualization of the flow with high-speed camera, investigation of instant pressure field with acoustic sensors and pressure drop in vortical chamber, measurements of velocity fields by using Laser Doppler Anemometer have been carried out. Study of influence of gaseous phase on parameters of nonstationary vortical flow has been carried out with wide variety of gas and liquid flow rates. It has been found that owing to high swirl of the flow separation of phases occurs and hollow vortex core forms. Transverse size of gas cavern in the center of the vortex increases with growth of gas flow rate and in the region of small gas content this effect is abrupt. Evolution of gas core influences on detected sharp reduction of frequency of PVC's precession and pressure drop when air is injected into the liquid. Experiments also have shown that pressure pulsations decrease with air addition.


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