Download - THE PHYSICAL PROPERTIES OF THE BLAST WAVE PRODUCED BY A STOICHIOMETRIC PROPANE/OXYGEN EXPLOSION
![Page 1: THE PHYSICAL PROPERTIES OF THE BLAST WAVE PRODUCED BY A STOICHIOMETRIC PROPANE/OXYGEN EXPLOSION](https://reader036.vdocuments.us/reader036/viewer/2022062305/5681637f550346895dd4603d/html5/thumbnails/1.jpg)
THE PHYSICAL PROPERTIES OF THE BLAST WAVE PRODUCED BY A STOICHIOMETRIC
PROPANE/OXYGEN EXPLOSION
MABS22 Bourges, France 2012
by
Maura C. Dewey & John M. Dewey
Dewey McMillin & Associates LtdVictoria, BC Canada
![Page 2: THE PHYSICAL PROPERTIES OF THE BLAST WAVE PRODUCED BY A STOICHIOMETRIC PROPANE/OXYGEN EXPLOSION](https://reader036.vdocuments.us/reader036/viewer/2022062305/5681637f550346895dd4603d/html5/thumbnails/2.jpg)
Operation DISTANT PLAIN 1966
MABS22 Bourges, France 2012
![Page 3: THE PHYSICAL PROPERTIES OF THE BLAST WAVE PRODUCED BY A STOICHIOMETRIC PROPANE/OXYGEN EXPLOSION](https://reader036.vdocuments.us/reader036/viewer/2022062305/5681637f550346895dd4603d/html5/thumbnails/3.jpg)
Operation DISTANT PLAIN 1966
MABS22 Bourges, France 2012
![Page 4: THE PHYSICAL PROPERTIES OF THE BLAST WAVE PRODUCED BY A STOICHIOMETRIC PROPANE/OXYGEN EXPLOSION](https://reader036.vdocuments.us/reader036/viewer/2022062305/5681637f550346895dd4603d/html5/thumbnails/4.jpg)
Air Blast Time-of-Arrival Detectors (ABTOADS)
Recorder
An array of switches was closed by the primary shock,and the signals sent via a single cable to a recorder
MABS22 Bourges, France 2012
![Page 5: THE PHYSICAL PROPERTIES OF THE BLAST WAVE PRODUCED BY A STOICHIOMETRIC PROPANE/OXYGEN EXPLOSION](https://reader036.vdocuments.us/reader036/viewer/2022062305/5681637f550346895dd4603d/html5/thumbnails/5.jpg)
Primary Shock Radius-Time Trajectory Analysis
Dewey (2005), J. Phys. D: Appl. Phys., 38, 4245-4251
MABS22 Bourges, France 2012
Propane+oxygen
Propane only
![Page 6: THE PHYSICAL PROPERTIES OF THE BLAST WAVE PRODUCED BY A STOICHIOMETRIC PROPANE/OXYGEN EXPLOSION](https://reader036.vdocuments.us/reader036/viewer/2022062305/5681637f550346895dd4603d/html5/thumbnails/6.jpg)
MABS22 Bourges, France 2012
The Piston Path – Random Choice Method (PP-RCM)G. I. Taylor (1946)
![Page 7: THE PHYSICAL PROPERTIES OF THE BLAST WAVE PRODUCED BY A STOICHIOMETRIC PROPANE/OXYGEN EXPLOSION](https://reader036.vdocuments.us/reader036/viewer/2022062305/5681637f550346895dd4603d/html5/thumbnails/7.jpg)
MABS22 Bourges, France 2012
![Page 8: THE PHYSICAL PROPERTIES OF THE BLAST WAVE PRODUCED BY A STOICHIOMETRIC PROPANE/OXYGEN EXPLOSION](https://reader036.vdocuments.us/reader036/viewer/2022062305/5681637f550346895dd4603d/html5/thumbnails/8.jpg)
Smoke Tracer Trajectory Used as the Piston Path
MABS22 Bourges, France 2012
MISERS GOLD
2.445 KT ANFO
SURFACE BURST
![Page 9: THE PHYSICAL PROPERTIES OF THE BLAST WAVE PRODUCED BY A STOICHIOMETRIC PROPANE/OXYGEN EXPLOSION](https://reader036.vdocuments.us/reader036/viewer/2022062305/5681637f550346895dd4603d/html5/thumbnails/9.jpg)
Use of an Arbitrary Piston Path
MABS22 Bourges, France 2012
Radius
Tim
e
ObservedShock trajectory
CalculatedShock trajectory
ArbitraryPiston Path
![Page 10: THE PHYSICAL PROPERTIES OF THE BLAST WAVE PRODUCED BY A STOICHIOMETRIC PROPANE/OXYGEN EXPLOSION](https://reader036.vdocuments.us/reader036/viewer/2022062305/5681637f550346895dd4603d/html5/thumbnails/10.jpg)
Use of an Arbitrary Piston Path
MABS22 Bourges, France 2012
Radius
Tim
e
ObservedShock trajectory
CalculatedShock trajectory
ArbitraryPiston Path.
![Page 11: THE PHYSICAL PROPERTIES OF THE BLAST WAVE PRODUCED BY A STOICHIOMETRIC PROPANE/OXYGEN EXPLOSION](https://reader036.vdocuments.us/reader036/viewer/2022062305/5681637f550346895dd4603d/html5/thumbnails/11.jpg)
Use of an Arbitrary Piston Path
MABS22 Bourges, France 2012
Radius
Tim
e
ObservedShock trajectory
CalculatedShock trajectory
ArbitraryPiston Path.
![Page 12: THE PHYSICAL PROPERTIES OF THE BLAST WAVE PRODUCED BY A STOICHIOMETRIC PROPANE/OXYGEN EXPLOSION](https://reader036.vdocuments.us/reader036/viewer/2022062305/5681637f550346895dd4603d/html5/thumbnails/12.jpg)
Comparison of Observed and Calculated Shock Trajectories
MABS22 Bourges, France 2012
Radius (m/kg^1/3)
0 5 10 15 20 25
Time (m
s/kg^1/3)
0
10
20
30
40
50
60
Propane/oxygen ABTOAD dataPP-RCM calculation
Propane/Oxygen ABTOAD DataPP-RCM Calculation
![Page 13: THE PHYSICAL PROPERTIES OF THE BLAST WAVE PRODUCED BY A STOICHIOMETRIC PROPANE/OXYGEN EXPLOSION](https://reader036.vdocuments.us/reader036/viewer/2022062305/5681637f550346895dd4603d/html5/thumbnails/13.jpg)
The PP-RCM Calculated the Physical PropertiesThroughout the Flow Field
MABS22 Bourges, France 2010
Scaled Radius – 2 to 20 m/kg^1/3 at NTP
![Page 14: THE PHYSICAL PROPERTIES OF THE BLAST WAVE PRODUCED BY A STOICHIOMETRIC PROPANE/OXYGEN EXPLOSION](https://reader036.vdocuments.us/reader036/viewer/2022062305/5681637f550346895dd4603d/html5/thumbnails/14.jpg)
The PP-RCM Calculated the Physical PropertiesThroughout the Flow Field
MABS22 Bourges, France 2010
Scaled Radius – 2 to 20 m/kg^1/3 at NTP
Scaled Time – 2 to 50 ms/kg^1/3 at NTP
![Page 15: THE PHYSICAL PROPERTIES OF THE BLAST WAVE PRODUCED BY A STOICHIOMETRIC PROPANE/OXYGEN EXPLOSION](https://reader036.vdocuments.us/reader036/viewer/2022062305/5681637f550346895dd4603d/html5/thumbnails/15.jpg)
The PP-RCM Calculated the Physical PropertiesThroughout the Flow Field
MABS22 Bourges, France 2010
Scaled Radius – 2 to 20 m/kg^1/3 at NTP
Scaled Time – 2 to 50 ms/kg^1/3 at NTP
Stored PropertiesHydrostatic Overpressure – OP (atm)
![Page 16: THE PHYSICAL PROPERTIES OF THE BLAST WAVE PRODUCED BY A STOICHIOMETRIC PROPANE/OXYGEN EXPLOSION](https://reader036.vdocuments.us/reader036/viewer/2022062305/5681637f550346895dd4603d/html5/thumbnails/16.jpg)
The PP-RCM Calculated the Physical PropertiesThroughout the Flow Field
MABS22 Bourges, France 2010
Scaled Radius – 2 to 20 m/kg^1/3 at NTP
Scaled Time – 2 to 50 ms/kg^1/3 at NTP
Stored PropertiesHydrostatic Overpressure – OP (atm)
Density – ρ (atm)
![Page 17: THE PHYSICAL PROPERTIES OF THE BLAST WAVE PRODUCED BY A STOICHIOMETRIC PROPANE/OXYGEN EXPLOSION](https://reader036.vdocuments.us/reader036/viewer/2022062305/5681637f550346895dd4603d/html5/thumbnails/17.jpg)
The PP-RCM Calculated the Physical PropertiesThroughout the Flow Field
MABS22 Bourges, France 2010
Scaled Radius – 2 to 20 m/kg^1/3 at NTP
Scaled Time – 2 to 50 ms/kg^1/3 at NTP
Stored PropertiesHydrostatic Overpressure – OP (atm)
Density – ρ (atm)Particle Velocity – U/a0
![Page 18: THE PHYSICAL PROPERTIES OF THE BLAST WAVE PRODUCED BY A STOICHIOMETRIC PROPANE/OXYGEN EXPLOSION](https://reader036.vdocuments.us/reader036/viewer/2022062305/5681637f550346895dd4603d/html5/thumbnails/18.jpg)
The PP-RCM Calculated the Physical PropertiesThroughout the Flow Field
MABS22 Bourges, France 2010
Scaled Radius – 2 to 20 m/kg^1/3 at NTP
Scaled Time – 2 to 50 ms/kg^1/3 at NTP
Stored PropertiesHydrostatic Overpressure – OP (atm)
Density – ρ (atm)Particle Velocity – U/a0
Calculated Properties
Dynamic Pressure, Temperature and Sound Speed
![Page 19: THE PHYSICAL PROPERTIES OF THE BLAST WAVE PRODUCED BY A STOICHIOMETRIC PROPANE/OXYGEN EXPLOSION](https://reader036.vdocuments.us/reader036/viewer/2022062305/5681637f550346895dd4603d/html5/thumbnails/19.jpg)
Results
MABS22 Bourges, France 2012
Overpressure (atm)
Time (ms/kg^1/3
0.0 0.5 1.0 1.5 2.0 2.5 3.0
Overpressure (atm
)
-0.4
-0.2
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
PP-RCM data at 2.5 m/kg^1/3
![Page 20: THE PHYSICAL PROPERTIES OF THE BLAST WAVE PRODUCED BY A STOICHIOMETRIC PROPANE/OXYGEN EXPLOSION](https://reader036.vdocuments.us/reader036/viewer/2022062305/5681637f550346895dd4603d/html5/thumbnails/20.jpg)
Data Fitted to Modified Friedlander Equation
MABS22 Bourges, France 2012
𝑃=𝑃𝑆𝑒−∝𝑡 ¿
Time (ms)
0 1 2 3
Overpressure (atm
)
-0.5
0.0
0.5
1.0
1.5
2.0
PP-RCM data at 2.5 m/kg^1/3Modified Friedlander Fit
![Page 21: THE PHYSICAL PROPERTIES OF THE BLAST WAVE PRODUCED BY A STOICHIOMETRIC PROPANE/OXYGEN EXPLOSION](https://reader036.vdocuments.us/reader036/viewer/2022062305/5681637f550346895dd4603d/html5/thumbnails/21.jpg)
Overdensity-Time History at 10 m/kg^1/3
MABS22 Bourges, France 2012
Time (ms)
0 2 4 6
Overdensity (atm
) -0.02
0.00
0.02
0.04
0.06
0.08
0.10
0.12
PP-RCM DataModified Friedlander Fit
![Page 22: THE PHYSICAL PROPERTIES OF THE BLAST WAVE PRODUCED BY A STOICHIOMETRIC PROPANE/OXYGEN EXPLOSION](https://reader036.vdocuments.us/reader036/viewer/2022062305/5681637f550346895dd4603d/html5/thumbnails/22.jpg)
Particle Velocity Time History at 20 m/kg^1/3
MABS22 Bourges, France 2012
Time (ms)
0 2 4 6
Particle V
elocity (u/a0)
-0.01
0.00
0.01
0.02
0.03
0.04
0.05
PP-RCM dataModified Friedlander Fit
![Page 23: THE PHYSICAL PROPERTIES OF THE BLAST WAVE PRODUCED BY A STOICHIOMETRIC PROPANE/OXYGEN EXPLOSION](https://reader036.vdocuments.us/reader036/viewer/2022062305/5681637f550346895dd4603d/html5/thumbnails/23.jpg)
Integration of the Equation over the Positive DurationProvides Quantities such as Impulse
MABS22 Bourges, France 2012
Radius (m/kg^1/3)
1 10
Overpressure Im
pulse (atm.s)
0.1
1
Log-log Plot of Impulse versus Scaled Radius
![Page 24: THE PHYSICAL PROPERTIES OF THE BLAST WAVE PRODUCED BY A STOICHIOMETRIC PROPANE/OXYGEN EXPLOSION](https://reader036.vdocuments.us/reader036/viewer/2022062305/5681637f550346895dd4603d/html5/thumbnails/24.jpg)
Summary
MABS22 Bourges, France 2012
All of the physical properties of a stoichiometricPropane/oxygen explosion have been characterised
![Page 25: THE PHYSICAL PROPERTIES OF THE BLAST WAVE PRODUCED BY A STOICHIOMETRIC PROPANE/OXYGEN EXPLOSION](https://reader036.vdocuments.us/reader036/viewer/2022062305/5681637f550346895dd4603d/html5/thumbnails/25.jpg)
Summary
MABS22 Bourges, France 2012
All of the physical properties of a stoichiometricPropane/oxygen explosion have been characterised
It has been demonstrated that a hemispherical blast wave can be fully
characterised using a simple ABTOAD array