Investigations of axisymmetric hypersonic free jets in high total enthalpy wind tunnels
Abstract
Axisymmetric hypersonic fully expanded free jets in an arc heated wind tunnel were investigated experimentally. The Reynolds number referred to nozzle exit diameter is on the order of 10,000. The stagnation temperatures of the test gases - Argon, and up to dissociated air - are from 2000 to 5000 K and the mean free path from 0.3 to 10 mm. Pitot probes, total ethalpy, and mass flow probes were used for the experiments. The free jet equations based on the boundary layer approximation were solved numerically by an implicit scheme. From the comparison of theoretical and experimental results the revelant influences due to high temperature and low density on the steam conditions at jet origin and at jet near field can be observed. The basic question about the jet spreading mode is discussed. The results of investigations in the near field indicate the laminar flow character of the investigated free jets.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- March 1975
- Bibcode:
- 1975STIN...7531398P
- Keywords:
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- Axisymmetric Flow;
- Free Jets;
- Hypersonic Flow;
- Plasma Jet Wind Tunnels;
- Arc Heating;
- Enthalpy;
- Far Fields;
- Flow Equations;
- Near Fields;
- Fluid Mechanics and Heat Transfer