In aviation engines, single-frequency noise exceeding 1000 Hz exists, and existing electro-aerodynamic loudspeakers are unable to achieve the acoustic load requirements for acoustic durability testing. The Hartmann generator, a high-frequency fluidic sound generator, was experimentally studied in an reverberation chamber to investigate its primary influencing factors, providing theoretical basis for designing a Hartmann generator applicable to acoustic durability tests. Key parameters including the distance between the nozzle and resonance tube, resonance tube depth, resonance tube diameter, nozzle diameter, and central rod length were systematically examined for their effects on the sound generation efficiency of Hartmann generator. Experimental results revealed that the fundamental frequency of the Hartmann generator is not only dependent on the resonance tube diameter and depth, but also significantly influenced by the distance between the nozzle and resonance tube. Furthermore, the resonance tube diameter correlates not only with the fundamental frequency but also directly affects the sound pressure level (SPL). Crucially, the study demonstrated that only Hartmann generator with automatically adjustable resonance tube depths are capable of satisfying the demanding requirements of acoustic durability testing.