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通过对垂直发射燃气排导装置中压力室与排气道的声场分析，非声不稳定性被认定为是声振的零阶振模，从而使非声问题可以利用现在成熟的声理论去分析．展示了声与非声同时存在的实验现象并对实验结果进行了定性分析。
Non-acoustic instability was identified as the zero-order mode of acoustic vibration by analyzing the acoustic field of the pressure chamber and the exhaust in the vertically-fired gas-conducting device so that non-acoustic problems can be analyzed using the now-mature acoustic theory . The experimental phenomena of simultaneous existence of sound and non-sound are shown and the experimental results are qualitatively analyzed.