| 摘要 |
A pulse jet engine comprising a quarter wave gas resonator ( 1 ) which is arranged to cycle at an ultrasonic frequency, wherein the resonator ( 1 ) is closed, or substantially closed, to gas flow at the pressure antinode ( 4 ) thereof. The shape and dimensions of the quarter wave gas resonator ( 1 ) at least partially determine the ultrasonic frequency at which the resonator ( 1 ) cycles.
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