Parametric Study for Hovering Performance of a Coaxial Rotor Unmanned Aerial Vehicle

This paper proposes a reliable aerodynamics analysis method designed for a coaxial rotor unmanned aerial vehicle. It is then used to investigate the effects of the selected design parameters on the hovering performance of the coaxial rotor. A coaxial rotor performance analysis code based on the source-doublet panel method is developed, and its accuracy is verified to be sufficient by comparing its results to various test data. Through a parametric study for the rotor design parameters, such as radius, twist, and taper, the effect of each parameter on the coaxial rotor design is investigated and a statistical analysis for the resulting data is conducted. The results show that the diameter has the biggest impact on the hovering performance of a coaxial rotor, whereas the taper has the biggest impact if the diameter is fixed. Based on these findings, a revised rotor platform is proposed, with 33 % improvement of the figure of merit over the baseline concept, which implies that the optimal design significantly improves the performance of the rotor under development.

[1]  Colin P. Coleman.  A Survey of Theoretical and Experimental Coaxial Rotor Aerodynamic Research , 1997 .

[2]  R. D. Harrington,et al.  Full-scale-tunnel Investigation of the Static-thrust Performance of a Coaxial Helicopter Rotor , 1951 .

[3]  M. Giles,et al.  ISES - A two-dimensional viscous aerodynamic design and analysis code , 1987 .

[4]  Robin Preator,et al.  Conceptual Design Studies of a Mono Tiltrotor , 2005 .

[5]  J. Gordon Leishman,et al.  Rotor Free-Wake Modeling using a Relaxation Technique Including Comparisons with Experimental Data , 1994 .

[6]  F. X. Caradonna,et al.  Experimental and Analytical Studies of a Model Helicopter Rotor in Hover , 1980 .

[7]  T. Nagashima,et al.  Optimum performance and wake geometry of co-axial rotor in hover , 1981 .

[8]  M. Selig.  Summary of low speed airfoil data , 1995 .

[9]  Daniel A. Wachspress,et al.  Impact of Rotor Design on Coaxial Rotor Performance, Wake Geometry and Noise , 2006 .

[10]  J. Anderson,et al.  Modern Compressible Flow: With Historical Perspective , 1982 .

[11]  Anton J. Landgrebe,et al.  An Analytical and Experimental Investigation of Helicopter Rotor Hover Performance and Wake Geometry Characteristics , 1971 .

[12]  Kevin W. Noonan,et al.  Rotor blade aerodynamic design , 1989 .

[13]  Richard C Dingeldein,et al.  Wind-tunnel Studies of the Performance of Multirotor Configurations , 1954 .

[14]  Aviv Rosen,et al.  Free Wake Model of Hovering Rotors Having Straight or Curved Blades , 1988 .

[15]  G. Vatistas,et al.  A simpler model for concentrated vortices , 1991 .

[16]  J G Leishman,et al.  Conceptual Design Studies of a Mono Tiltrotor (MTR) Architecture , 2004 .

[17]  Paolo Mantegazza,et al.  TOWARD A COMPUTATIONAL FRAMEWORK FOR ROTORCRAFT MULTI-PHYSICS ANALYSIS: ADDING COMPUTATIONAL AERODYNAMICS TO MULTIBODY ROTOR MODELS , 2004 .

[18]  J. Gordon Leishman,et al.  Measurements of Rotor Tip Vortices Using Three-Component Laser Doppler Velocimetry , 1996 .

[19]  John L Hess,et al.  CALCULATION OF NON-LIFTING POTENTIAL FLOW ABOUT ARBITRARY THREE-DIMENSIONAL BODIES , 1962 .

[20]  Sangook Jun,et al.  Robust Design Optimization of Unmanned Aerial Vehicle Coaxial Rotor Considering Operational Uncertainty , 2011 .

[21]  M. J. Andrew.  Co-axial rotor aerodynamics in hover , 1980 .