| Citation: | MA Shuai, LIU Fan, JI Jiayuan, et al. Numerical simulation of effect of flow field on discharge characteristics in pressure relief door of nacelle[J]. Journal of Aerospace Power, 2023, 38（10）：2338-2348 doi: 10.13224/j.cnki.jasp.20210641
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On the basis of verifying the correctness of CFD method by using the experimental datum in NACA TN4007 report, the influence laws of different incoming Mach number, total pressure ratio and flap angle on the discharge pressure relief characteristics were studied through calculation, and the causes of these laws were analyzed through flow field. Results showed that when the total pressure ratio was greater than a certain value, the discharge flow ratio (DFR) decreased with the increase of incoming Mach number under the same total pressure ratio, due to the formation of choke-out in the discharge channel after the total pressure ratio promoted the discharge speed to transonic speed. The DFR increased to a certain value with the increase of the flap angle, and then began to fall back and then rose slowly, because when choke-out happened, the flap angel became larger, the average Mach number at the minimum geometric area of the discharge channel first lied in the subsonic section, then transited from the transonic section to the supersonic section, and then moved back to the transonic section and even the subsonic section. At the same time, the separated vortex reflux on the upper surface of the flap also reduced the DFR if it occurred at the minimum geometric area.
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