NEED OF STUDYING LUNAR Dust

1. Manned mission

2. Establish permanent base

3. Mine lunar soil

4. Dust removing techniques

5. Control inside a capsule

Source: <www.U-LunaProject.org>

PROBLEMS WITH LUNAR DUST

1. Dangerous to human beings

2. Accumulation on engineering devices

3. Difficult to remove

4. Shape

5. Size

6. Wide existence

Source:<http://cientifica.eu>

Part ITracking of Irregular Shaped Particle

Part IIModeling and Simulation

of Lunar Dust Remover

PART I: TASKS

1. Literature review

2. Effect of shape on force coefficients

3. Tracking algorithm

4. Application of UDF

5. Particle tracking

6. Results

Various Shapes

STUDY OF SHAPE

Source:<www.sandgrains.com>

Moon dust from Apollo 11

ALGORITHM IMPLEMENTATION

In House ProgramConcept demonstration

Algorithm

User Defined Functions(UDF)FeasibleCost effective

MOTION STUDY

Translation(CD & CL)

Rotation(T & θ)

+

(Time Step)

From θ T

α=T/I

ω = ω0 + αt

θp = θ0 + ωt + ½ αt2

θf = tan-1(Vyrel/Vxrel)

θ = θp - θf

θ CD and FD

θ0 = θ and ω0= ω

Stepsor

Domain

TRANSLATION

STOP

STARTI, m, θ, CD, CL & T

CD & CL

Y

N

MODEL TO STUDY TRANSLATION

V

Elliptical barrier tilted at different angle

0.05 X 0.1 m2D flow path

FORCES ACTING ON THE BARRIER

FD = Drag force (N)

FD = CD 1/2 ρ V2 A

FL = Lift force (N)

FL = CL 1/2 ρ V2 A

CD = Drag coefficientCL = Lift coefficientρ = Density of fluidV = Flow velocityA = Characteristic frontal area of the body

Velocity vectors at elliptical barrier

VARIATION WITH ANGLE

Variation of Coefficient of Drag

Variation of Coefficient of Lift

VARIATION OF CD WITH ANGLE

From θ T

α=T/I

ω = ω0 + αt

θp = θ0 + ωt + ½ αt2

θf = tan-1(Vyrel/Vxrel)

θ = θp - θf

θ CD and FD

θ0 = θ and ω0= ω

Stepsor

Domain

ROTATION

STOP

STARTI, m, θ, CD, CL & T

Torque T

Y

N

STUDY OF TORQUE

Torque = Force × Displacement

Pressure Force Shear Force

VARYING TORQUE WITH ANGLE

UDF FOR ELLIPTICAL PARTICLE

Relative Angle

Relative Reynolds Number

Drag

Lift

STRAIGHT CHANNEL

Spherical Particle Track

Comparison of Spherical & Elliptical

Particle Track

ELBOW CHANNEL

Spherical Particle Track

Comparison of Spherical & Elliptical

Particle Track

From the study of forces

CD and CL decreases with Re

T increases with Re

Graph follows similar pattern

SHAPE is important factor

RESULTS AND DISCUSSION

Dust Remover

Air Filter

Enclosed Capsule Wall

Air Circulation Line

Outer Door

Inlet

Outlet

Inner Door

PART II : LUNAR DUST REMOVER

Blower

BOUNDARY CONDITIONS AND PARAMETERS

Boundary Conditions

1.Inlet : Velocity inlet

2.Outlet : Pressure Outlet

3.Sidewall : Wall

4.Object : Wall

Parameters

1.Velocity = 4 m/s

2.Swirl components :Radial = 0.3

Tangential = 0.3Axial = -1

3. Re = 250,000

0 Sec

18

RECTANGULAR MODEL

Pro-E modelVelocity Pathlines

Simple flow Particle Track

Swirl flow

CYLINDRICAL MODEL

Pro-E model

Particle Track

Simple flow

Velocity Pathlines

Swirl flow

0 Sec

11.8 1

0 m/s

MORE DUST REMOVER MODEL

Pear Shaped ModelDome Shaped Model

DOME SHAPED MODEL

Particle track

Swirl flow

Velocity pathlines and vectors

Simple flow

PEAR SHAPED MODEL

Particle track

Swirl flow

Velocity vectors

Swirl flow

Model Flow typeParticle Escaped

out of 100

In 30 Sec. In 60 Sec.

RectangularSimple 28 37

Swirl 30 54

CylindricalSimple 52 75Swirl 32 50

Dome ShapeSimple 85 89

Swirl 57 87

Pear ShapeSimple 47 49

Swirl 100 100

COMPARISON: PARTICLE ESCAPED

COMPARISON OF MODELS

Particles Removed

Out of 100

Models

From the study of Lunar dust remover Pear Shaped Model:

I.Particle Escaped = 100

II.Maximum Time = 21 Sec

III.Mass of Air Needed = 12.6 kg

IV.Better Design

RESULTS AND DISCUSSION

CONCLUSION

1. UDF for lift, drag and torque

2. Tracking of elliptical particle

3. Model: Pear shaped

4. Flow: Swirl

FUTURE WORK

1. UDF for 3D

2. Study for other Re

3. Body force: Electric Charges

THANK YOUTHANK YOU

QUESTIONS?QUESTIONS?