| Popis: |
A model study was made on rocket tailoff, using both annular-type and centerbody-type auxiliary ejectors. The investigation was conducted in the T- 5BR1 Altitude Test Cell with steam and air as the driving fluids for both the simulated rocket and annular or centerbody-type ejector. Performance was obtained for the simulated rocket and ejector running individually as a diffuser ejector and for both the simulated rocket and ejector operating in tandem. The ejector was used to evacuate the test cell prior to simulated rocket ignition and to maintain cell pressure following simulated rocket tailoff. Both the center body-type and annular-type auxiliary ejectors have the effect of a variable area contraction in the diffuser similar to a second throat. The start and breakdown pressure ratio was increased by increasing the ejector driving pressure, which is similar to the effect of reducing the contraction area ratio, A sub st/A sub d, of a second-throat diffuser. |
