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The Flame Tracker @ SDSU
Flame Controller Layout
Thermocouple
Stepper Motor
Moving Apparatus
Flame Tracker: How It Works!
Stepper Motor
Lead Screw
Carriage
Guide Rail
Fuel
Tracking Thermocouple
Flame Test Stand
Teflon Nut
Pillow Block
Sample Holder
As the flame reaches the tracking thermocouple, the stepper motor moves the sample upward to maintain a constant thermocouple temperature. The flame becomes stationary with respect to the thermocouple, hence, the laboratory.
Stepper Motor & Controller Serial Port communication Created software driver
instead of expensive board
Labview Control Program.•Front panel with Velocity vs. Time graph
• Transformation equation parameters
Wiring Diagram
Software Driver
Labview makes special driver board for stepper motor Designed software driver using serial port vi’s.
Transform Control Diagram
Hardware
Pentium IV 1.4GHz
Breakout board with Analog Device 5B47 modules
The Initial Test, AFP, Air, 0.16 mm ThickVelocity vs. Time
-0.5
0
0.5
1
1.5
2
2.5
3
0 50 100 150 200
Time (s)
Ve
loci
ty (
mm
/s)
The velocity graph above shows a preliminary plot of the spread rate as measured by the flame tracker. It is the velocity at which the sample is moved to hold the flame stationary with respect to the laboratory coordinates.
A stationary flame.Thermocouple
Flame Tracker in Operation:Spreading Flame Converted to Stationary Flame
Thermocouple
Repeatability of the Spread Rate Measurement by the Flame Tracker
Comparison with Manual Measurement
Flame Controller Data
0
0.5
1
1.5
2
2.5
3
0 20 40 60 80 100
Time (s)
Temp = 25 CPressure = 754mm/Hg
Comparison with Manual Measurement
Flame Controller 4.4 Averaged every 5 seconds
0
0.5
1
1.5
2
2.5
3
0 20 40 60 80 100
Time(s)
Velo
city
(mm
/s) Stdev = 0.06
Stdev= 0.15
Stdev= 0.17
Average Velocity 1.8 mm/s
Comparison with Manual Measurement
Manual Data
0
0.5
1
1.5
2
2.5
3
0 20 40 60 80 100
Time(s)
Velo
city
(mm
/s) Stdev= 0.02
Stdev= 0.03
Stdev= 0.02
Average Velocity 1.8 mm/s
