Experiments on mixing and combustion with low heat release in a turbulent shear flow
Abstract
A new blowdown facility to study mixing and combustion in a turbulent shear layer has been built. The system is capable of 100 m/s for three seconds in a 5 x 20 cm exit area on the high speed side, and 50 m/s in a 10 x 20 cm exit area on the low speed side. Dilute concentrations of hydrogen and fluorine, carried in an inert gas, react when both fluid streams meet at the tip of a splitter plate. The reaction is spontaneous, rapid, and highly exothermic. The resulting temperature field has been studied using a rake of eight fast response thermometers placed across the width of the layer. Runs have been performed for low heat release over a wide range of equivalence (concentration) ratios, at a Reynolds number of 30,800 based on velocity difference and vorticity thickness. The heat release is sufficiently low so that the overall properties of the mixing layer are not significantly changed from the cold case. The results show the presence of large, hot structures within the flow together with cool, irrotational tongues of freestream fluid that penetrate deep into the layer.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- 1983
- Bibcode:
- 1983PhDT........30M
- Keywords:
-
- Combustion;
- Mixing;
- Reynolds Number;
- Shear Flow;
- Turbulent Flow;
- Wind Tunnel Tests;
- Atmospheric Models;
- Chemical Reactions;
- Mixing Layers (Fluids);
- Temperature Profiles;
- Thermometers;
- Thickness;
- Fluid Mechanics and Heat Transfer