Abstract
The article explores a physical phenomenon characteristic of the gas dynamics of microflows. Exhaustion of a supersonic jet of a vibrational exited polyatomic gas from convergent nozzles with diameters ranging from 63 to 1000 μm is considered. The influence of vibrational nonequilibrium of the gas on the gas-dynamic structure of supersonic axisymmetric jets is detected in experiments and is numerically confirmed. This influence is manifested as a decrease in the streamwise size of the wave structure cells and reduction of the number of these cells as compared to the equilibrium supersonic flow. It is demonstrated that the maximum effect is observed in jets escaping from nozzles with diameters about 250 μm.
1 More- Received 6 November 2019
- Accepted 9 April 2020
DOI:https://doi.org/10.1103/PhysRevFluids.5.083401
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