Numerical Simulation Of Aerodynamic Characteristics Of Multi-element Airfoil

A multi-element airfoil is also called a high lift airfoil,which is made up of slat and flap,such as flap and slat,which can produce a lift effect.At present,most civil aircraft wings adopt multi-element airfoil structure.The research on the interaction between wings and fluids is mainly from experimental and numerical simulation directions.With the improvement of computer hardware level,the numerical simulation method has become the mainstream of the aerodynamic characteristics analysis of airfoil.First,introduce the basic concepts of fluid flow,numerical simulation calculation method,mesh method and Fluent software,Fluent is selected as the subsequent numerical simulation analys is software;Secondly,using the numerical simulation method to establish NACA0006 airfoil,Analys is of airfoil examples under different angle of attack and different Maher numbers,It is used to verify the reliability of the numerical simulation method.Then,select the DLR-F11 wing,Based on Reynolds average Navier-Stokes equation,structural grid division and geometric modeling method,Using the Spalart-Allmaras turbulence model,To study the influence of wing of different angle and different flap angle on aerodynamic characteristics,and Simulation of the effects of flaps on flight control;Finally,in order to study the aerodynamic characteristics of the multi-element airfoil near the ground surface,A two-dimensional and three-dimensional model is established by using the 30p-30 n three-element airfoil.The aerodynamic characteristics of the near ground surface of the multi-element airfoil are numerically simulated and analyzed from the chord direction and the spread direction.Analys is shows that: The results of numerical simulation are in line with the theory of wing aerodynamics,and the prediction accuracy of aerodynamic performance is at the present stage,which is in good agreement with the experimental research.It is feasible to predict aerodynamic performance of multi-element wing.By studying the angle of attack and flap deflection angle,it is found that the aerodynamic characteristics calculated by different declination are basically the same with the experimental results and trends.And for the research on the airfoil,the deviation angle of flaps with better aerodynamic characteristics at take-off stage and landing stage is selected;Through the numerical simulation analys is of flap angle,It can provide a useful reference for the optimization of the flap mechanism in the simulation of flight simulator.Through a multi wing surface aerodynam ic characteristic analysis,found that as the height decreases slowly,multi wing lift coefficient and drag coefficient also decreases,negative effects was produced.When the attack angle is large,the lift loss of multistage wing is large,and the ground effect is more obvious.The altitude of the flight is reduced,and the pressure difference between the wings of the multi-element airfoil is produced,and the air flow moves along the horizontal direction of the airfoil.