Integrated attack angle and crosswind characteristics of nacelle-and-fan based on airworthiness compliance
By taking turbofan engine as the research object,the characteristics and flow field of nacelle and fan integration under the conditions of 0°,15°,25° attack angle and 90° crosswind of±10,±20 m/s and±30 m/s were studied by numerical simulation.The results showed that with the increase of attack angle,the negative effect of the reverse crosswind on the performance of the nacelle inlet and fan was greater under the same wind speed.According to the airworthiness clause requirements of maneuverability,wind speed and surge/stall characteristics,when the attack angle was 25°,the forward and reverse crosswind ranges that the nacelle and fan integration performance can withstand were about 0-23 m/s and 0-18 m/s,respectively,and when the crosswind speed was±30 m/s,the allowable maneuvering attack angle ranges were about 0°-3° and 0°-2°,respectively.
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