Influence of geometric parameters of nacelle pressure relief door on flow characteristics
A method of CFD simulation was used to calculate the discharge flow ratio of different fillets,hinge forms,and aspect ratios.Impact mechanism of different pressure relief flow was also researched.These results could support the engineering design of nacelle pressure relief door.The research showed that the fillet only increased the discharge flow ratio slightly.In addition,pressure relief doors of different hinges had different discharge flow ratios,the goose neck type was superior to the pivot hinge type and the page hinge type,due to the hinge installation which caused the changes of the outside heading flow and the exhaust channel.Specifically,the pressure relief door with goose neck hinge had the strongest discharge capacity owing to the largest exhaust channel,and some air flowed from the installation slot.However,the external flow hit the page hinge type and then blocked the flow from both sides,which caused the weakest discharge capacity.The external flow of the pivot hinge type had stronger ejection effect on the discharge flow,causing stronger discharge capacity than the page hinge type.However,the discharge capacity of the pivot hinge type was weaker than the goose neck type because of the smaller exhaust channel.The pressure relief door with larger aspect ratio had larger discharge flow ratio,due to the reduced winding flow of the external air and the increased exhaust flow owing to the coiled vortex.
nacellepressure relief doorfilletaspect ratiohingedischarge flow ratio
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