Face Ventilation System Analysis and Design with help of CFD simulations NIOSH Ventilation Meeting...
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Transcript of Face Ventilation System Analysis and Design with help of CFD simulations NIOSH Ventilation Meeting...
Face Ventilation System Analysis and Design with help of CFD simulations
NIOSH Ventilation Meeting
Todor Petrov, Graduate Student, Mining Department, University of Kentucky
NIOSH Grant 2000 - 2009
Outline• About myself• Objectives• Classes completed• Research performed• Results of the conducted research study
– Validation of SC/Tetra CFD code using PIV measurements of 1:15 scaled physical model
– Validation of SC/Tetra CFD code using airflow and methane measurements collected during experiments conducted in NIOSH Ventilation Gallery with equipment free face area
– Validation of SC/Tetra CFD code using airflow and methane measurements collected during benchmark experiments conducted in NIOSH Ventilation Gallery with a continuous miner equipped with a scrubber
– CFD simulations of face ventilation applying original geometry of JOY14CM15 continuous miner
• Future work
About myselfEDUCATION
• University of Kentucky– PHD Student
• University of Mining and Geology, Sofia, Bulgaria– MSc in Mining Engineering, specialization Underground Mining– Postgraduate: Computer Technologies, Information and Control
Systems
EXPERIENCE• University of Mining and Geology, Sofia, Bulgaria
– Assistant Professor in Mine Ventilation and Safety– R&D Engineer at UMG Research Institute
Classes completed
• Advanced Mine Ventilation (MNG 641)• Topics in Mining Engineering - Blasting (MNG 699)• Seminar in Mining Engineering (MNG 771)• Advanced Control System Analysis (ME 645)• Scale Modeling (ME 565)• Combustion Phenomena (ME 536)• Numerical Analysis (CS 537)• Preparing Future Faculty (GS 650)
Total credit hours: 21
Objectives
To provide the mining industry an effective CFD simulation package for analysis and design of face ventilation systems during deep cut mining.
Research Performed
• CFD code validation using data obtained from previously conducted experiments on small scale and full size physical models.
• CFD code optimization for best performance
• Preliminary CFD simulations of face ventilation scenarios for blowing and exhausting line-brattice.
Validation of SC/Tetra CFD code using PIV measurements of 1:15 scaled physical model
B. Simulated results
Experimental SetupEquipment free face area; Tide-rib distance 2 ft; Setback 35 ft; Height 7 ft; Flow rate 2700 cfm
3,6 m 4,3 m 4,9 m 6.1 m
(12 ft) (14 ft) (16 ft) (20 ft)
3,6 m 4,3 m 4,9 m 6.1 m
(12 ft) (14 ft) (16 ft) (20 ft)
A. PIV Data (Wala et. al. 2000-2004)
Results of SC/Tetra CFD simulations for free of equipment face area
(a) Curtain distance from the rib of 0.3 m (1 ft)
(b) Curtain distance from the rib of 0.6 m (2 ft)
(c) Curtain distance from the rib of 1.2 m (4 ft)
Results of the simulation study for flow rate• 1.3 m3/s (2700 cfm)
The results for • 1.7 m3/s (3500 cfm), • and 2.6 m3/s (5500 cfm) are similar
3,6 4,3 m 4,9 m 6.1 m
(12‘ (14') (16') (20’)
3,6 4,3 m 4,9 m 6.1 m
(12‘ (14') (16') (20’)
3,6 4,3 m 4,9 m 6.1 m
(12‘ (14') (16') (20’)
Line brattice distanced', (ft)
Entry width, w (ft)
12 13 14 15 16 20
1 A* A A* A A A
2 B* B B* C* A* A*
3 B B B B B B
4 B* B* B* B B B*
Stages of the flow behavior
A A A A
A AB B
B B B B
The asterisks mark the validated scenarios
Validation of Cradle SC/Tetra CFD code using airflow and methane measurements collected during experiments
conducted in NIOSH Research Gallery for equipment free face area
• Simulation results
Experimental setup
• 30 feet deep Box cut (35 ft setback distance)
• 6000 cfm air flow rate• 5.27 cfm methane flow rate
The results of this experimental studies were presented during 2005 SME Annual Meeting at Salt Lake City (Taylor et. al., 2005).
• Experimental results
X
Y
0 10 20 300
10
20
30
Ch4
0.60.50.40.30.20.10
Measured and simulated methane distribution
• Experimental data v/s simulation results for the mid-plane• Correlation coefficient = 0.72
0 5 10 15 20 25 30 35 400.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
3.5’
Measurement point number
CH4
Section in X-Z plane
X-Y Plan view above the miner
Section in X-Y middle plane
X-Y Plan view below the miner
The results of the experimental study were presented during 12th U.S./North American Mine ventilation Symposium (Wala et. al. 2008)
Simulated scenario:• Box cut• Box cut width 13 ft• Total entry width 16.5 ft• Tide rib distance 2 ft• Air flow 4000 cfm• Scrubber flow 4000 cfm• Methane flow 13.4 cfm
Validation of SC\Tetra CFD code using airflow and methane measurements collected during benchmark experiments conducted in NIOSH Research Gallery
with a continuous miner equipped with a scrubber
Measured and simulated methane distribution
• Correlation coefficient = 0.65
0 5 10 15 20 25 30 35 400.00
0.10
0.20
0.30
0.40
0.50
0.60
Measurement point number
CH4
Parallel position
Simulated methane concentration for different position of the miner
Miner turnedleft on 1.5 deg
Miner turnedRight on 1.5 deg
• Same scenario as previews for 3 different positions of the miner
Parallel position
Simulated methane Concentration
• 3D view with isosurface of methane concentration = 1%
Miner turnedleft on 1.5 deg Miner turned
Right on 1.5 deg
CFD simulation of face ventilation applying original geometry of JOY14CM15 continuous miner
Geometry provided by Joy Mining Machinery Inc
Blowing line brattice
Scrubber effect on methane concentration.
Simulated scenario:
• Blowing line brattice• Box cut• Box cut width 13 ft• Total entry width 16.5 ft• Tide rib distance 2 ft• Air flow 6000 cfm• Scrubber 4000 cfm• Methane flow 13.4 cfm
Blowing line bratticeMethane concentrations above the miner
(plane z=5.6 ft)
Scrubber off Scrubber 4000 cfm Scrubber 5000 cfm
Exhausting line bratticeMethane concentrations above the miner
(plane z=5.6 ft)
Scrubber off Scrubber 4000 cfm
Simulated scenario:
• Exhausting line brattice• Box cut• Box cut width 13 ft• Total entry width 16.5 ft• Tide rib distance 2 ft• Air flow 6000 cfm• Scrubber 4000 cfm• Methane flow 13.4 cfm
Future work
• Design and development of CFD models database for different face ventilation systems.
• Design and development of specialized software engine for automation of Face Ventilation Simulation process based on Microsoft VB interface supported by Cradle to handle SC/Tetra built-in functions as methods and variables.
• Testing and validation study of the developed design package
Concept for automation of Face Ventilation Simulation process Todor Petrov, University of Kentucky
FVSdatabase
SCT prime
Specify model
Specify conditions
CADfiles
CADfiles
Modelfile
Conditionsfile
Modelfiles
Modelfiles
Conditionfiles
Conditionfiles
SCT pre
SCT solver SCT preSCT post
START
Face Vent. Sym.