Longitudinal Aerodynamic and Stability Characteristics of High-Aspect-Ratio Unmanned Aerial Vehicles in Gust Response

• Main Authors: Junli Wang, Wensheng Zhang, Bolin Feng, Zhigui Ren, Qinghe Zhao
• Format: Article
• Language: English
• Published: Departamento de Ciência e Tecnologia Aeroespacial 2019-06-01
• Series: Journal of Aerospace Technology and Management
• Subjects: High-aspect-ratio UAVs; Gust response; Numerical simulation; Longitudinal stability characteristics
• Online Access: http://www.scielo.br/pdf/jatm/v11/2175-9146-jatm-11-e2719.pdf

The aim of this work is to propose an accurate and reliable numerical simulation method of gust response, so as to analyze longitudinal stability characteristics of high-aspect-ratio unmanned aerial vehicles (UAVs) under gust response. Based on the dual-time stepping method, the unsteady Navies-Stokes equation was solved. By introducing grid velocity to study the effects of gust, the numerical simulation of gust response was realized. Moreover, the numerical simulation method was verified to be accurate by using the theoretical value and reference value obtained in previous research. The calculation results of the high-aspect-ratio UAV under the 1-cos gust reveal that longitudinal aerodynamic forces of high-aspect-ratio UAVs changed. In the whole range of gust gradient length, the UAVs were always in the state of static stability. However, with the increase of gust velocity, the static stability margin decreased. The numerical simulation method of gusts established in this study preferably overcomes the possible numerical oscillations and divergence problems caused by excessive gust velocity. The analysis of longitudinal static stability and stability margin of high-aspect-ratio UAVs under the effects of gusts can ensure flight quality and safety of UAVs under the effects of gusts.