| Popis: |
Gas-dynamic resonance ignition is a new technology prospective in repetitive starting of future space vehicle. Based on the investigation of structural and operational reliability for some schemes of hydrogen and oxygen resonance ignition, a novel type of coaxial hydrogen/oxygen resonance ignition scheme was advised. By means of more than 1000 times of gas-dynamic resonance heating mechanism tests, basic techniques of coaxial hydrogen/oxygen resonance ignition have been successfully investigated, including the characterization of resonance gas, verification of annular injector nozzle resonating performance, and the optimization of ignition device configuration etc. Firing tests on a basic hydrogen/oxygen resonance ignition tester have verified its ignition reliability and feasibility. Based on this basic coaxial hydrogen/oxygen resonance ignition tester, two types of coaxial hydrogen/oxygen resonance ignition devices have been developed that could be applied to the simultaneous ignitions of multi-combustor in aerospike nozzle engine, namely a multi-tube coaxial hydrogen/oxygen resonance igniter and a multi small coaxial hydrogen/oxygen resonance igniters assemblage. Firing tests on both devices have been qualified of reliable repetitive simultaneous ignition capacity for hydrogen/oxygen aerospike nozzle engine’s repeated starting, of which the latter has better feasibility. Based on the heating effect of resonance tube, gas-dynamic resonance ignition becomes a new ignition technology in engineering. When put a one-end-closed tube inside a jet, opening end pointed to the upstream, gas flows inside and outside the tube cavity may couple to form interface of self-oscillated shock wave under specified aerodynamic and geometrical conditions. Energy provided by the high-speed jet sustains the high frequency oscillation of shock wave in the tube. When frequency of the oscillation is close to that of resonance tube’s inherent self-oscillation, the pressure and temperature of those gases stuck at the closed end of tube cavity will be augmented to many times higher than the ambient. This phenomenon has been called gas-dynamic resonance heating. As a kind of high-energy source generator, it can be utilized to ignition in chemical propulsion domain. |
