Browse Publications Technical Papers 2007-01-2909
2007-11-28

Aerodynamic Study of Propeller-Engine Performance for Micro Air Vehicle Design 2007-01-2909

The present research is due to study the performance of engine and propeller to be used in the design of a Micro Air Vehicle (MAV), utilizing for it commercial parts like engines and propellers to reduce fabrication costs. An experimental metodology was used to measure the followings variables for the engines: Thrust (T), velocity (RPM), cylinder head temperature (CHT), wind incident velocity (V8), aerodynamic drag (D) and momentum (M). A subsonic wind tunnel was use to study: the motor-propeller thrust, the aerodynamic drag and the velocity profiles of each propeller. In order to know the adequate flight velocity for the MAV, the relation thrust against drag (T/D) was studied. The propeller-engine selection was in funtion of its trush and efficiency. The lifth variation of the airplane due to the downstream zone of the propeller was introduced to acurate the model design.

SCOPES

The goals presented in this research are the following:
  • Determine the best operation point of the combustion engine.
  • Measure the dynamic and static thrust for each propeller, also studying its behavior with the RPM and the incident velocity.
  • Obtain the velocities profile downstream of each propeller.
  • Measure the momentum and determine the propellers efficiency according to the RPM.

LIST OF SYMBOL

A
frontal area
b
distance of aplication force
β
incidence angle of blade
c
chord of propeller
CD
aerodynamic drag coefficient
CM
aerodynamic moment coefficient
CHT
cylinder head temperature
D
aerodynamic drag force
d
propeller diameter
f
mass for moment measurement
g
gravity
l
total length of the arm that supports f
L
length of lever
m
mass
M
engine momentum
MR
resistive momentum
P
pitch per revolution
r
propeller radius
?
density of air
RPM
propeller angular speed
T
thrust
Ts
static thrust
Td
dynamic thrust
V8
wind incident velocity
V
total velocity on tip of blade
VT
tangential velocity
Y
propeller radial direction
X
propeller axial direction

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