| Citation: | YU Jin, WANG Song, LIU Yong, et al. Trim analysis method of helicopter based on CFD/CSD loose coupling[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(5): 941-951. doi: 10.13700/j.bh.1001-5965.2019.0329(in Chinese)
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In this paper, a helicopter trim calculation method based on the CFD/CSD loose coupling strategy is proposed. The CSD solver and rotor CFD solver use the blade elastic axis and pitch axis as media to exchange aerodynamic load and response data through linear interpolation method. In the coupling strategy of this paper, CFD and CSD solver operate in the time domain respectively, and exchange the data once per revolution. The aerodynamic force calculated by CFD solver is used to correct the aerodynamic input of aeroelastic analysis in trim calculation, until the trim parameters and CFD aerodynamic force no longer change in the iterative process, and the coupling trim solutions are obtained. In this paper, the SA349/2 helicopter is taken as an example to calculate the forward flight state. The results show that the coupling method in this paper converges rapidly and has good stability. The comparison between the calculation results and the measured flight values verifies the effectiveness of the proposed method, and it has a good ability to capture the aerodynamic curve of blade and the blade vortex distraction.
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