Research Of The Belly Flap Lift-enhancement Scheme Of The Hypersonic Aircraft Horizontal Take-off

The issue of the hypersonic aircraft horizontal take-off began to enter the field of research,because of its unique configuration of small aspect ratio wings,making it at low speed takeoff lift enough.Irrespective of complex hoisting devices,the belly flaps have a simple but noticeable increase in low-speed wing-fuselage aircraft takeoff.It is of great significance to study the lift-enhancement scheme of belly flaps for the horizontal take-off of hypersonic aircraft.Firstly,the paper introduces the various lifting programs and increasing principles of low-speed aircraft.In the open literature,the experiments and numerical calculations of the common lifting and drag reduction schemes,such as mechanical flaps and winglets,are reviewed in detail.Flap research results.Secondly,the concrete numerical simulation methods,turbulence model and boundary condition settings used in numerical simulation are introduced.For hypersonic aircraft takeoff level configuration,SA turbulence model and first-order spatial accuracy model are used to solve the problem.Thirdly,based on the veneer model of abdomen flaps mentioned in the literature,the computational model of the hypersonic aircraft and the belly flap combination is established and the grid independence analysis is carried out.Then,the calculation of the lift resistance of the hypersonic aircraft with the addition of belly flaps revealed that the hypersonic aircraft could not take off itself with low Mach number and small angle of attack,and the general belly flap model could not Produce increasing effect,at higher Mach number,high angle of attack conditions,there is a certain increase effect,but the increase effect is not obvious.Then,based on the proposed physical model and numerical method of hypersonic aircraft and belly flap combination,the model structure of belly flaps is improved and the structural parameters of belly flap are mainly studied.The structure of belly flaps and the installation position are analyzed Influence of Parameters on Lifting Resistance Characteristics of Hypersonic Aircraft During Takeoff.Finally,with the aim of further researching how to improve the model of abdominal flaps and how to improve the effect on hypersonic aircraft,a new configuration of abdominal jet flaps is proposed to replace single-plate abdominal flaps.The influence of the performance parameters of the abdomen jet-flap model on the lift-drag characteristics of hypersonic aircraft is selected.Comparing the increasing effect of the belly-jet flaps model and the single-plate belly-flap model,the numerical results show that the belly-jet flaps model compares the single-plate abdomen with the low Mach number Flaps have better lifting effect.The main line of the paper is the research process of the belly flap lift-enhancement scheme of the hypersonic aircraft horizontal take-off.The purpose of this paper is to study the design of the belly-jet-flaps lifting device and analyze the effects of the belly flaps on the low velocity flow field.Numerical method validation,performance parameter analysis to the whole process of the target object research and design are realized.