Interaction effects produced by injection of vapourizing liquids into supersonic flows.

The possibility of obtaining side thrust by injection of a vapourizing liquid into a hot supersonic flow is investigated. A simplified analytical solution is presented for the case where injection produces boundary layer separation, and the case where mixing between injected liquid and supersonic stream occurs without separation. The side specific impulse and cooling effect produced by water injection are computed for separation. Very high values of specific impulse and temperature reduction are predicted. Mixing is found to be a generally unsteady condition except at low temperatures and low injection rates. Experiments show that separation does occur and that the predicted pressure increase due to injection is easily attainable