This masters thesis defense presentation summarizes the student's research on modeling lunar dust removal. Part I discusses developing a tracking algorithm to study the effect of irregular particle shape on migration. Variables like drag and lift coefficients were calculated for different shapes. Part II examines designing and simulating different dust remover models, finding that a pear shape with swirl flow performed best by removing all particles within 21 seconds using 12.6 kg of air. The student concludes the pear shaped design with swirl flow is the most effective lunar dust removal system studied.
A REVIEW STUDY ON GAS-SOLID CYCLONE SEPARATOR USING LAPPLE MODEL | J4RV4I1001
Defense prashant
1. MASTERS THESIS DEFENSE
REMOVAL OF LUNAR DUST INSIDE CONFINED SPACE AND
EFFECT OF SHAPE IRREGULARITY ON PARTICLE
MIGRATION
Presented By
Prashant M. Ghadge
Advisor : Dr. Xianchang Li
Department of Mechanical Engineering
(Lamar University, Beaumont, Texas)
2. Part I
Tracking of Irregular Shaped
Particle
Part II
Modeling and Simulation
of Lunar Dust Remover
3. 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
6. TRANSLATION
START
I, m, θ, CD, CL & T
From θ T
α=T/I CD & C L
ω = ω0 + αt
θp = θ0 + ωt + ½ αt2
θf = tan-1(Vyrel/Vxrel)
Y
θ = θp - θ f
Steps θ CD and FD
or θ0 = θ and ω0= ω
Domain
N
STOP
7. MODEL TO STUDY TRANSLATION
Elliptical Barrier
V
Y
X
0.05 X 0.1 m
2D flow path
Elliptical barrier tilted
at different angle
8. FORCES ACTING ON THE BARRIER
FD = Drag force (N)
FD = CD 1/2 ρ V2 A
Lift FL = Lift force (N)
Drag FL = CL 1/2 ρ V2 A
Gravity CD = Drag coefficient
CL = Lift coefficient
ρ = Density of fluid
V = Flow velocity
A = Characteristic frontal
Velocity vectors at elliptical barrier area of the body
11. ROTATION
START
I, m, θ, CD, CL & T
From θ T
α=T/I Torque T
ω = ω0 + αt
θp = θ0 + ωt + ½ αt2
θf = tan-1(Vyrel/Vxrel)
Y
θ = θp - θ f
Steps θ CD and FD
or θ0 = θ and ω0= ω
Domain
N
STOP
16. ELBOW CHANNEL
5m
133
5m
Y
X
0 Sec
Comparison of
Spherical
Spherical & Elliptical
Particle Track
Particle Track
17. RESULTS AND DISCUSSION
From the study of forces
CD and CL decreases with Re
T increases with Re
Graph follows similar pattern
SHAPE is important factor
18. PART II : LUNAR DUST REMOVER
Inlet
Inner Door
Blower
Air
Filter Dust
Remover Enclosed
Capsule
Outer Door Wall
Outlet
27. RESULTS AND DISCUSSION
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
28. CONCLUSION
1. UDF for lift, drag and torque
2. Tracking of elliptical particle
3. Model: Pear shaped
4. Flow: Swirl