| Citation: | LIU Shiming, YING Xucheng, LI Deng’an, et al. Wind tunnel test of variable speed rigid rotor performance and load[J]. Journal of Aerospace Power, 2023, 38（2）：354-363 doi: 10.13224/j.cnki.jasp.20210217
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In order to study the influence of rotating speed variation on the performance and vibratory load of rotor, a scaled hingeless rigid rotor was developed. The dynamic scaled and Mach number scaled hover test and wind tunnel test were carried out. Rotor trim, performance, blade and pitch link loads, hub loads and some other aspects were studied by changing the thrust, airspeed and rotating speed. The credibility of the test results was proved by the repeatability and periodicity of the performance and the vibratory load. Results indicated that the power required can be saved by reducing the rotor speed for both hover and forward flight, and lower thrust showed higher effectiveness. The amplitude of vibratory hub load was not obviously increased by reducing rotor speed. The frequency of rotor rotating speed vibratory blade load and pitch link load increased, because the cyclic pitches were greater in trimmed condition for slower speed, which was adverse to the fatigue life of the rotating parts. Natural frequencies of the rotating blade should be avoided for varying the rotor speed to prevent enlargement of the vibratory load caused by the resonance.
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