| Popis: |
By considering compressibility and friction in the feed lines of a liquid bipropellant system, various stabilizing devices are considered for elimination of low-frequency instability. The relative effects of several of these devices (orifice, inductive venturi, flexible hose, distributed capacitance core) and of different propellants are determined experimentally by pulsing the propellant flow rate and observing the change in decrement rates of the resultant chamber pressure oscillations. Although the inductive venturi and distributed capacitance core were found to have an appreciable stabilizing effect, the greatest stabilizing effect was achieved by using a more reactive fuel. Both Fourier and Mirragraph analyses of the chamber pressure oscillations indicate the presence of several predominant frequencies. |
