Downwash modelling for three-lifting-surface aircraft configuration design

查看全文 作　　者：Salvatore [1]CORCIONE;Giordana [2]BONAVOLONTÃ;Agostino DE [1]MARCO;Fabrizio [1]NICOLOSI 机构地区：[1]Department of Industrial Engineering,University of Naples“FedericoⅡ”,Naples 8125,Italy;[2]School of Aerospace Transport&Manufacturing,Cranfield University,Bedford MK43 OAL,United Kingdom 出　　处：《Chinese Journal of Aeronautics》索引2023年第36卷第6期,共13页 基　　金：funded for the development of an innovative high-capacity regional turboprop platform by the IRON project;received funding from the Clean Sky 2 Joint Undertaking under the European Union's Horimpzon 2020 research and innovation program under Grant Agreement No.699715;part of Clean Sky 2 REG-GAM 2018 project implemented on the H2020 program under GA 807089。 摘　　要：This paper introduces a semi-empirical model to predict the downwash gradient at the horizontal tail of a three-lifting-surface aircraft.The superposition principle applied to well established formulations valid for two lifting surfaces is not a reasonable approach to calculate the downwash of a canard-wing-tail layout,and this paper demonstrates that such a basic technique leads to incorrect results.Therefore,an ad hoc prediction model is proposed that considers the combined nonlinear effects of canard and main wing inductions on tail downwash,being based on a full factorial design sweep of CFD simulations obtained by varying the main geometrical parameters of the three lifting surfaces.A suitable analytical formula for the downwash gradient is established through a process of data analysis and factor extraction.The presented model extends the validity of the available models for traditional two-lifting-surface designs by means of a correction factor.The engineering estimation method introduced here exhibits an acceptable accuracy,as well as relatively small prediction errors,and it is suitable for conceptual and preliminary studies of threesurface layouts.The value of this methodology is confirmed by the validation with the results of numerical and experimental investigations on a case study aircraft. 关 键 词：Aerodynamic modelling Aircraft design Design of experiments Downwash Three-lifting-surface