An analysis on 45° sweep tail angle for blended wing body aircraft to the aerodynamics coefficients by wind tunnel experiment

AEROS Conference 2017

Latif, M.Z.A. Abd^1 ; Ahmad, M.A.^1 ; Nasir, R.E. Mohd^1 ; Wisnoe, W.^1 ; Saad, M.R.^2

Flight Technology and Test Center (FTTC), Faculty of Mechanical Engineering, UiTM Shah Alam, Selangor, Malaysia^1

Universiti Pertahanan Nasional Malaysia (UPNM), Faculty of Engineering, Kem Sungai Besi, Kuala Lumpur, Malaysia^2

关键词: Aerodynamic characteristics;    Blended wing body aircrafts;    Blockage correction;    Coefficient of drag;    High-speed wind tunnel;    Lift to drag ratio;    Streamline curvature;    Wind tunnel experiment;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/270/1/012001/pdf
DOI  :  10.1088/1757-899X/270/1/012001

来源: IOP

【 摘 要 】

This paper presents the analysis of a model from UiTM Blended Wing Body (BWB) UAV, Baseline V that has been tested at UPNM high speed wind tunnel. Baseline V has a unique design due to different NACA sections used for its fuselage, body, wing root, midwing, wingtip, tail root, tail tip and the tail is swept 45° backward. The purpose of this experiment is to study the aerodynamic characteristics when the tail sweeps 45° backward. The experiments are conducted several times using 71.5% scaled down model at about 49.58 m/s airspeed or 25 Hz. The tail angle deflection is fixed and set at zero angle. All the data obtained is analyzed and presented in terms of coefficient of lift, coefficient of drag and also lift-to-drag ratio, and is plotted against various angles of attack. The angles of attack used for this experiments are between -10° to +30°. The blockage correction such as solid blockage, wake blockage and streamline curvature blockage are calculated in order to obtain true performance of the aircraft. From the observation, Baseline V shows that the aircraft tends to stall at around +15°. The maximum L/D ratio achieved for Baseline V is 20.8, however it decreases slightly to 20.7 after blockage corrections.