| Citation: | WANG Chenchen, FENG Shiyu, PENG Xiaotian, et al. Transient simulation on pressure relief process of engine nacelle[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(11): 2284-2290. doi: 10.13700/j.bh.1001-5965.2019.0081(in Chinese)
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The design of the engine nacelle pressure relief door will affect the safety of the nacelle. The pressure relief is a dynamic process, which is related to the pressure inside and outside the nacelle, the freestream Mach number and the structure of the pressure relief door. Based on the Modelica language, a zero-dimensional transient simulation mathematical model of the nacelle pressure relief process was established, and the pressure relief door (PRD) discharge and moment coefficient under different opening angles were calculated via computational fluid dynamics (CFD). Then those coefficients were substituted into the zero-dimensional transient simulation model, and the variation relationship of key parameters such as the plenum compartment pressure and opening angle of the PRD with time during the pressure relief process is obtained. The influence of the plenum compartment pressure threshold and the maximum opening angle of the PRD on the pressure relief process was analyzed. The study results show that reducing the plenum compartment pressure threshold for PRD opening will reduce the time required for the pressure relief process reaching to the equilibrium stage, but has no effect on the plenum compartment pressure and reciprocating swing angle/amplitude at equilibrium stage; properly reducing the maximum opening angle can effectively reduce the PRD reciprocating swing angle/amplitude in the equilibrium stage, and has no effect on the pressure relief rate in the initial stage and the plenum compartment pressure in the equilibrium stage, but excessive reduction of the maximum opening angle will decrease the pressure relief rate in the initial stage and increase plenum compartment pressure in the equilibrium stage.
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