Summary
The heat addition in a Laval-nozzle flow and in a Prandtl-Meyer corner expansion caused by condensation of water vapor in moist air is investigated. In both flow fields at the onset of condensation density, pressure and temperatur increase due to the release of the latent heat of vaporization. Experiments show that the energy addition is related to a relaxation process, and that the changes of the flow parameters can be expected in three different forms. In steady flow the thermodynamic state may change smoothly or it is discontinuous. At high rates of heat addition the flow becomes unsteady and it follows a repetitive cycle. The comparison of steady and unsteady flow fields allows the extraction of simple similarity rules by a dimensional analysis in conjunction with the laws of gasdynamic.
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Frank, W. Condensation phenomena in supersonic nozzles. Acta Mechanica 54, 135–156 (1985). https://doi.org/10.1007/BF01184842
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DOI: https://doi.org/10.1007/BF01184842