Loading...

Aerodynamic Analysis and Design of a Propeller for Light Flying Objects

Sardari, Ali | 2015

535 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46996 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Farhanieh, Bijan
  7. Abstract:
  8. One of the major concerns in the use of light flying objects is propulsion for cruise and take off from land. Creating propulsion force is important in such way that no excessive weight is introduced, especially in case of UAVs. A common trend for propulsion in light flying objects is using propellers. Propellers are commonly driven by an external motive force and due to this force and their geometry, they convert energy from this motive force into the momentum of fluid in which they are immersed as a result a lift force is generated.In the present work, trend of propeller design with optimum performance is introduced with use of vortex theory, optimum energy loss condition or Betz condition and optimum performance condition. Optimum performance condition cause of create optimum lift coefficient distribution condition on the propeller blade. Airfoil performance characteristics for use in the design trend are extracted from airfoil design software. The effect of aerodynamic parameters of the airfoil, such as optimal lift coefficient and optimal angle of attack, on the performance of the propeller are studied by designing three propeller with three airfoil families by use of introduced design trend in the same operating condition. Results show that propeller act on the 88 to 89 percent performance in the designing point and the design of propulsion is considered. By aerodynamic simulating the fluid flow around the propeller the proposed design strategy is verified. It has been observed that the optimal angle of attack significantly affects the geometry of the propeller; on the other hand, the optimal lift coefficient, in addition to geometry, influences the performance of the propeller in secondary point and leading to changes in generated propulsion of propeller
  9. Keywords:
  10. Design ; Airfoil ; Optimum Propeller ; Vortex Theory ; Optimal Lift Coefficient

 Digital Object List

 Bookmark

No TOC