Large Aspect Ratio Composite Rudder Conceptual Design, In The End Of The Layout

The paper investigates aerodynamic design of the control devices for a high aspect ratio tailless configuration. Based on the aerodynamic characteristics of the configuration, primary schemes of the aerodynamic control devices are put forward. This paper applies and develops the potential calculation method with turbulence boundary layer's drag correction to calculate the capability of control devices for the configuration. The control devices' design scheme is provided by way of choice for the configuration investigation. It includes the following researches.Many good uses for reference is provided for this paper by analyzing present situation and offer developing direction of investigation tailless configuration's aerodynamic control devices.Potential method is applied to calculate the aerodynamic characteristics as lift, moment and induce drag based on analyzing flow of small back swept wings with high aspect ratio and the control devices. According to the flow characteristics and necessities of investigated problem, leading edge thrust and turbulence boundary layer's integral method are used to amend drag and ensure the reliability and precise of calculation.Provide the assumption and simplification of ignoring the flow influence of high aspect ratio wing's flap deflexion to other parts of wing. The assumption and simplification is validated by the pressure distribution and flow characteristics on high aspect ratio wing with shells control surface based on the calculate of N-S equation and k-e turbulence model. The good results show that the conclusions are satisfied by the calculation of numerical simulation and experiment.The aerodynamic characteristics are calculated for basic configuration, and the primary scheme of composite and clamshell control devices are provided for basic configuration. The longitudinal, lateral and direction of this configuration can be controlled through the combination of different control devices. The composite control devices are made up of three flaps, which function is longitudinal control and lateral control. The clamshells control surface opened up and down to control of yawing and rolling.The capability of pitch, yaw and roll control is calculated for high aspect ratio configuration with control devices, and the control devices' ability and deficiency are analyzed. According to the results, the functions of control devices arecompartmentalized. The details of the design scheme on the aerodynamic control devices are as followings:(1) The composite control devices can provide satisfying efficiency in the range of deflexion when they are used as longitudinal control devices; it is an effective way to increase longitudinal static stability. The middle and outboard flap can be used as elevator, too.(2) The composite control devices adopt concept design of distributed trailing edge flaps with the combination of different deflexion, the conception is effectual for yawing control and avoids coupling rolling moment.(3) The conception set of distributed trailing edge flaps can provide rolling control solely, namely to be regarded as general aileron. It can also be used as unite yawing and rolling control.(4) The clamshell conception of folio drag control surfaces is satisfied for yawing control of high aspect ratio tailless configuration, but its append biggish coupling rolling moment must be eliminate by the other devices.(5) Clamshells become general aileron and can be used to rolling control when they deflect uniform.