Transcript Study of explosion propagation in elongated closed vessels

Postdoctoral Research Project PN-II-RU-PD-2012-3-0035
Contract No. 17/26.04.2013
Study of explosion propagation in
elongated closed vessels
Duration: 01.05.2013 – 31.10.2015
Director of Project:
Dr. Codina Movileanu
Mentor of Project:
Dr. Domnina Razus
Financing:
State budget
Name of the Programme Human Resources
PN II:
Subprogram:
Postdoctoral research project
Budget
Duration of contract:
Contracting Authority:
Contractor:
300000 lei
30 months
Executive Unit for Financing Higher
Education, Research, Development and
Innovation
“Ilie Murgulescu” Institute of Physical
Chemistry
Project Budget:
Budget chapter
(expenses)
2013
(lei)
2014
(lei)
2015
(lei)
Total
(lei)
63100
54386
27514
145000
Inventory
11543
10392
5374
27309
Mobility
23454.24
23900
0
47354.24
Overhead
28775.76
25525
26036
80336.76
Total
126873
114203
58924
300000
Salaries
Project Summary:
The main objective of this project is the experimental investigation of closed-vessel explosive
combustion of fuel-air mixtures, in deflagration regime, in elongated cylindrical vessels
(length/diameter > 3) in order to reveal the heat losses during flame propagation and to evaluate
their impact on the flammability parameters. In these vessels, both central and side ignitions will
be performed.
The study will be realized with ethylene-air mixtures at various initial concentrations and various
initial pressures, at ambient initial temperature. The objectives of the project are: (1) The
experimental determination of the maximum explosion pressures and explosion times for
ethylene-air mixtures at various p0 in elongated cylindrical vessels with various L/D ratios;
(2)The calculation of adiabatic explosion pressures for fuel-air mixtures within the flammability
range at ambient p0, using available computer packages; (3) The calculation of the maximum
rates of pressure rise for fuel-air mixtures with various equivalence ratios at various p0 in
elongated cylindrical vessels; (4) The experimental determination of the propagation velocity for
deflagrations of ethylene-air mixtures at various initial pressures in elongated cylindrical vessels.
The knowledge of characteristic parameters of these processes allows the assessment of explosion
risks for flammable mixtures in various conditions and the design of equipment and industrial
plants where flammable mixtures might be formed.
Project Objectives:
I. Project objectives 2013
1. Experimental measurement of flammability parameters for stoichiometric
ethylene-air mixtures in three asymmetrical closed vessels with central
ignition at ambient p0 and T0
2. Examination of maximum explosion pressures and of times to reach the
maximum pressure as a function of asymmetry ratio R=L/D
3. Calculation of the maximum rates of pressure rise and propagation velocities
from pressure-time history and examination of their variation as a function
of the asymmetry ratio
4. Experimental measurement of flammability parameters for stoichiometric
ethylene-air mixtures in 3 asymmetrical closed vessels with central ignition
at ambient T0 and various initial pressures
5. Computation of adiabatic flammability parameters
Estimated results for 2013:
•
Flammability parameters for stoichiometric ethylene-air mixtures in three
asymmetrical closed vessels with central ignition at ambient p0 and T0 ;
•
Flammability parameters for for stoichiometric ethylene-air mixtures in 3
asymmetrical closed vessels with central ignition at ambient T0 and various
initial pressures .
0.00
0.01
0.02
0.03
0.04
0.05
0.06
0.07
800
10
700
1
700
8
600
600
300
200
100
celula C4
celula C5
500
6
4
(dp/dt)max, bar/s
400
p / bar
500
-1
10
9
8
7
6
5
4
3
2
1
0
-1
-2
-3
-4
(dp/dt) / (bar s )
p / bar, UIP
Experimental results:
2
2
400
300
200
0
0.00
0.01
0.02
0.03
0.04
0.05
0.06
-100
0.07
t/s
100
0
0.00
0.01
0.02
0.03
0.04
0.05
0.06
t/s
Figura 1 – Variatia de presiune (Δp) si
semnalul sondei de ionizare (SI) inregistrate
la explozia unui amestec stagnant 6.54 vol.
% C2H4-aer in celula cilindrica avand
raportul L/D = 1.5, la p0 = 1 bar.
Figura 2- Curbe presiune-timp pentru
explozia initiata central a unui
amestec stoichiometric etena-aer, la
p0 = , T0 = 298 K in doua celule de
explozie: 1- celula cilindrica C1 (L/D
= 1.5); 2 - celula cilindrica C2 (L/D
=2.5 )
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
p0, bar
Figura 3 – Viteze maxime de crestere
a presiunii pentru explozia unui
amestec stoichiometric etena-aer in
doua celule cilindrice cu aprindere
centrala (C3 avand L/D = 8.1; C2
avand L/D = 2.5)
2.0
Project Objectives:
II. Project objectives 2014
1.
Experimental measurement of flammability parameters for ethylene-air
mixtures with various initial concentrations in 3 asymmetrical closed
vessels with central ignition, at ambient p0 and T0;
2.
Experimental measurement of flammability parameters for ethylene-air
mixtures with variable initial concentration in 3 asymmetrical closed
vessels with central ignition at ambient T0 and various p0;
3.
Management of the project and dissemination of results.
Estimated results:
 Flammability parameters for ethylene-air mixtures with various initial
concentrations in three asymetrical closed vessels with central ignition at ambient p0
and T0 (maximum explosion pressures and times to reach the maximum explosion
pressures, maximum rates of pressure rise, propagation velocities);
 Flammability parameters for stoichiometric ethylene-air mixtures in three
asymetrical closed vessels with central ignition at ambient T0 and various initial
pressures;
 Computed adiabatic flammability parameters (adiabatic explosion pressures and
adiabatic flame temperatures)
 Heat release profiles in stoichiometric ethylene-air flames at various initial
pressures.
Experimental results:
10
40
6 vol. %
5 vol. %
4 vol.%
300
(dp/dt)max, bar*s
8
30
max, s
pmax, bar
6 vol. %
5 vol. %
4 vol. %
-1
9
7
experimental
adiabatic
6
20
200
100
5
4
5
6
7
8
9
[C2H4], vol.%
Figura 1- Presiuni de explozie
masurate in celula cilindrica avand L/D
= 8.1 cu aprindere centrala
10
0.0
0.6
1.2
1.8
p0, bar
Figura 2 – Timpii de explozie
masurati in celula cilindrica avand
L/D = 8.1 cu aprindere centrala
0
0.0
0.5
1.0
1.5
p0, bar
Figura 3 – Viteze maxime de crestere
a presiunii pentru explozia unor
amestecuri etena-aer in celula
cilindrica avand L/D
= 8.1 cu
aprindere centrala
Dissemination of project results:
1. C. Movileanu, D. Razus and V. Gosa, Explosion of gaseous ethylene-air mixtures in closed
cylindrical vessels with asymmetrical ignition, International Conference of Physical
Chemistry - ROMPHYSCHEM 15th edition: September 11-13, 2013, Bucharest, Romania
(Poster);
2. Codina Movileanu , Venera Giurcan, Domnina Razus and Vasile Gosa, Flame propagation in
elongated cylindrical vessels with asymmetrical ignition, Eighth Mediterranean
Combustion Symposium, September 8-13, 2013 Çesme, İzmir, Turkey (Poster);
3. C. Movileanu, D. Razus, V. Giurcan and V. Gosa, Explosion parameters of gaseous ethyleneair mixtures in elongated cylindrical vessels, PRIOCHEM IX – 24-25 oct. 2013,
Bucharest, Romania (Oral communication);
4. C. Movileanu, D. Razus, V. Giurcan and V. Gosa, Experimental and numerical study of
ethylene flame propagation in enclosures, French Italian Joint Combustion Meeting:
April 23- 24, 2014, Pisa, Italy (Poster);
5. C. Movileanu, D. Razus, V. Giurcan and V. Gosa, Flame propagation of ethylene-air mixtures
in closed tubes, 9th International Colloquium on Pulsed and Continuous Detonations, 1824 mai 2014, Puskin, St. Petersburg, Rusia (Oral communication);
6. C. Movileanu, D. Razus, V. Giurcan and V. Gosa, Presssure evolution of ethylene-air
explosion in enclosures, XXI Fluid Mechanics Conference, 15-18 iunie 2014 in Cracovia,
Polonia (Poster).
7. C. Movileanu, D. Razus, V. Giurcan and V. Gosa, Study of Burning Velocity of Ethylene-Air
Flame in Closed Cylindrical Vessels, International Conference on Heat Transfer and Fluid
Flow, Prague, Czech Republic, August 11-12, 2014 (Poster).
Training of the Project Director:
1. “2013 Princeton Combustion Summer School”,
Princeton University, NJ, USA, June 2013.
2. “The Combustion Institute Summer School 2013”, Lund
University, Lund Sweden, Aug. 2013.
Published papers:
- C. Movileanu, D. Razus, V. Giurcan and V. Gosa, Pressure evolution
of ethylene-air explosions in enclosures, J. Physics, Conf. Series,
08/2014, 530(1): 012014.
- C. Movileanu, D. Razus, V. Giurcan and V. Gosa, Flame
propagation of ethylene-air mixtures in closed tubes, Proc. Symp.
on Pulsed and Continuous Detonations, St. Petersburg, June 2014,
pp. 68-72.
- C. Movileanu, D. Razus and V. Gosa, Explosion of gaseous
ethylene-air mixtures in closed cylindrical vessels with
asymmetrical ignition, submitted to Journal of Hazardous Materials,
november 2014.