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Reverse of laminar-turbulent transition in a supersonic underexpanded microjets

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The results of measurements of supersonic length of underexpanded microjets outflowing into the atmosphere, by Pitot
tube and the millimeter-diameter jets outflowing into low pressure chamber on the laminar and turbulent regimes are presented.
Measurements of the supersonic length were supplemented with measurements of the mass flow rate pulsations on the jet axis by
hot-wire anemometer and schlieren-visualization of the flow field. Experiments were conducted under the equal/approximately equal
Reynolds number of micro - and millijets. It was found the restoration of laminar flow in jets at a certain values of the jet
underexpansion (Reynolds number of the jet).

Author(s):

Sergey Mironov    
Khristianovich Institute of Theiretical and Applied Mechanics SB RAS
Russian Federation

Vladimir Aniskin    
Khristianovich Institute of Theiretical and Applied Mechanics SB RAS
Russian Federation

Anatoly Maslov    
Khristianovich Institute of Theiretical and Applied Mechanics SB RAS
Russian Federation

Ivan Tsyryulnikov    
Khristianovich Institute of Theiretical and Applied Mechanics SB RAS
Russian Federation