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针对机载大气数据系统静压源误差问题,分析静压源误差的各影响因素,提出静压源误差的修正方案,以提高大气静压测量值的精度,进一步确保飞机飞行安全。以波音757机型为例,分析了静压源误差主要影响因素及其影响规律,用Solid Works软件进行飞机三维几何建模,GAMBIT软件划分计算域网格,FLUENT软件模拟飞机飞行环境仿真得到不同迎角和马赫数下的静压源误差值,并采用曲面响应法计算得到飞机静压源误差回归模型,根据模型对静压源误差进行了修正。经仿真结果与实际对比验证,该套修正方案具有很好的修正效果,能快速、准确的得到大气真实静压。采用计算流体力学(CFD)仿真方法分析飞机空气动力特性,简单方便、研究周期短、精度高、耗费成本低,有较高的研究和实际应用价值。
Aiming at the error of static pressure source of airborne airborne data system, the paper analyzes each factor of static pressure source error and proposes a correction plan of static pressure source error to improve the accuracy of atmospheric static pressure measurement and further ensure the flight safety. Taking Boeing 757 model as an example, the main influencing factors and influencing rules of static pressure source error were analyzed. Solid Works software was used to make 3D geometric modeling of aircraft. GAMBIT software was used to divide the computational domain grid. FLUENT simulation software was used to simulate different flight environments. Angle of attack and Mach number of static pressure source error, and the use of curved surface response method to calculate the aircraft hydrostatic pressure error regression model, according to the model of static pressure source error was amended. The simulation results and the actual comparison verify that this set of correction programs have a good correction effect, can quickly and accurately get the real atmospheric pressure. The computational fluid dynamics (CFD) simulation method is used to analyze the aerodynamic characteristics of aircraft. It is simple and convenient, has short research period, high precision and low cost, and has high research and practical value.