| Citation: | LIU Yongping, OUYANG Yan, MENG Shaofei, et al. Transonic unsteady aerodynamic characteristics in heavy gas medium[J]. Journal of Aerospace Power, 2025, 40（11）：20240470 doi: 10.13224/j.cnki.jasp.20240470
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The unsteady transonic aerodynamic characteristics of a NACA64A010 airfoil in air and heavy gas medium R-134a were simulated by using the Reynolds-averaged Navier-Stokes equations (RANS) and the Spalart-Allmaras (SA) one-equation turbulence model. Under the same Mach number, Reynolds number and reduced frequency, the calculation results of simple harmonic motion in pitch showed that the distribution of modulus and phase of unsteady pressure coefficient in heavy gas medium was obviously different from that in air, the unsteady lift coefficient was not different from that in air medium, and the amplitude and phase of pitch moment coefficient were different from those in air medium. The transonic similarity law was applied to the unsteady aerodynamic force correction, and the amplitude and phase of pitch moment coefficient were transformed into air similarity, but with the increase of reduced frequency, the correction effect of transonic similarity law became worse. Through analysis of pitching moment work, it was shown that if the unsteady aerodynamic force in heavy gas was not corrected by similarity, the flutter characteristics in air and heavy gas could be different, thus affecting the evaluation of flutter characteristics in heavy gas wind tunnel. This study can provide a basic support for the follow-up research on flutter characteristics of aircraft in heavy gas media and the development of correction methods.
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