AN INVESTIGATION OF A SUPERSONIC FLUID AMPLIFIER
ALABAMA UNIV UNIVERSITY BUREAU OF ENGINEERING RESEARCH
Pagination or Media Count:
Results of an analytical and experimental investigation of a supersonic fluid amplifier are presented. An analysis is presented by which the bistable state of a supersonic amplifier can be described. One-dimensional assumptions are made in order to determine the fluid properties before the fluid separates from the nozzle boundary. The area ratio and Mach Number at separation are predicted by assuming that the particles moving along a characteristic streamline in the boundary layer flow into a stagnation region. The location of the stagnation region and the strength of the oblique shock initiated at that boundary determine whether the separated free stream boundary at that surface is deflected into the opposite exit channel or flows out the adjacent exit channel. The location of the stagnation region is predicted in terms of the specific heat ratio and the chamber to discharge pressure ratio. Results from both theoretical equations and experimental data are presented in graphical form. An analysis is presented and an equation is derived to predict switching times. The analysis is based on a control volume located at the control port region. Experimental switching times determined from high speed schlieren film are tabulated for nitrogen and hydrazine at chamber pressures of 1200 and 1000 psig.
- Fluidics and Fluerics