nikita grushetzky vitaliimatiunin stepanzakharov -...
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Magnus gliderNikita Grushetzky
Vitalii MatiuninStepan Zakharov
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The problem
Glue the bottoms of two light cups together to make a glider. Wind an elastic band around the centre and hold the free end that remains. While holding the glider, stretch the free end of the elastic band and then release the glider. Investigate its motion.
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FirstFirstobservationsobservations
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Glider 4
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Launcher
Rubber band
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Flight path of a glider (120 fps) 6
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Parts of the flight path
mg
FA
glidepath
pirouette
mg
FA
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Outline of the report
Air flow around the rotating cylinder
Aerodynamic characteristics of the glider
Computer simulation of gliderComputer simulation of glider’’s motions motion
Explanation of uniqueness of the loop
Typical flight paths
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Air Air flow aroundflow arounda rotating cylindera rotating cylinder
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Flow type behind the glider
4Re 10vr
Flow behind the glideris turbulent
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Aerodynamic force
v
1v
2v
DF
LF
F
Bernoulli's principle: 1 2 1 2v v p p
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Setup #1: wind tunnel
Drive sectionContraction cone
Test chamber
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Wind tunnel scheme
Rotating cylinderPlume of smoke
High speed camera
Prism
Laser
Cylindrical lens
Air turbineElectric motor
Honeycombs
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Cylinder rotates in the test chamber
Electric motor
Cylinder
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Flow without rotation (video) 15
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Flow with rotation (video) 16
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Induced tip vortices 17
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Induced tip vortices
Thouault N. et al. (2012) “Numerical analysis of a rotating cylinder with spanwise discs”.
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TypicalTypicalflight pathsflight paths
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Low initial velocity
Hillshape
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Increasing of the initial velocity
Cuspshape
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High initial velocity
Loopshape
mg
Fa
v
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What is “high” and “low” velocity?
2mg v S
mgvS
3 m/sv
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Zero initial velocity 24
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Zero initial velocity (240 fps) 25
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Reverse rotation
Arcshape
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Reverse rotation (120 fps) 27
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AerodynamicAerodynamiccharacteristicscharacteristics
“Investigate its motion…”
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Aerodynamic forces
Drag force
Lift force
Glider angular velocity
Glider velocity
Depend on
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Spinning ratio
0 10rv
v
r
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Aerodynamic coefficients
212
212
( )
( )D D
L L
F C v S
F C v S
Crosssection
Dynamicpressure
Dragcoefficient
Liftcoefficient
Dragforce
Liftforce
Spinningratio
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The main idea
Wind tunnel?
Glidepath!
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Constancy of the angular velocity 33
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Balance of forces on a glidepath
mgv
DF LFcossin
D
L
F mgF mg
F
212
212
( )
( )D D
L L
F C v S
F C v S
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Gliders
А B
35
20.02 m12 g; 23 g
Sm
20.01 m5.5 g; 10.5 g; 15.5 gS
m
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0
10
20
30
40
50
60
0 2 4 6 8 10
Spinning ratio
Dev
iatio
n an
gle
(°)
А1А2А3B1B2
Vertical deviation angle
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0
1
2
3
4
5
6
0 2 4 6 8 10Spinning ratio
Dra
g co
effic
ient
A1A2A3B1B2
Drag coefficient 37
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0
1
2
3
4
5
6
0 2 4 6 8 10Spinning ratio
Lift
coef
ficie
nt
A1A2A3B1B2
Lift coefficient 38
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Aerodynamic force
v0
4.5
1
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ComputerComputersimulationsimulation
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Test flight path 41
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IP simulation 42
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Comparison with experiment 43
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Is it possibleIs it possibleto produce moreto produce morethan one loopthan one loop??
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Only one loop!
LF
DF
Radiusr
2
L
mvrF
sStoppingdistance
2
D
mvsF
1 L DF F r s
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Velocity increased 3 times more… 46
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SummarySummary
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Main results 48
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References
• Swanson W.M. (1961) “The Magnus effect: A summary of investigations to date”. Trans. ASME D83, 461–470.
• Mittal S., Kumar B. (2003) “Flow past a rotating cylinder”. J. Fluid Mech. 476, 303–334.
• Thouault N. et al. (2012) “Numerical analysis of a rotating cylinder with spanwise discs”. AIAA, 50, 271–283.
• Seifert J. (2012) “A review of the Magnus effect in aeronautics”. Progr. Aero. Sci. 55, 17–45.
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