The performance of nacelle pressure relief door under different opening modes was numerically simulated

and the correctness of the numerical calculation was verified according to the experimental data in the NACA TN4007 report. On this basis

different Mach numbers (Ma=0.5

0.7 and 0.9) and pressure ratios (Rp=1.2

1.4 and 1.6) were compared for the effects on the discharge performance and force characteristics of the pressure relief door. The calculation results showed that under a certain Mach number

the discharge flow coefficient Cdr increased with the increase of pressure ratio. Under a certain pressure ratio

the discharge flow coefficient Cdr decreased with the increase of Mach number. In opening mode 2

discharge flow coefficient of the pressure relief door was slightly better than in opening mode 1. Since the pressure relief door was parallel to the flow in opening mode 1

the pressure relief coefficient of the pressure relief door was much smaller than that of opening mode 2

and the pressure coefficient of the pressure relief door was higher than that of opening mode 2

about twice of opening mode 2.