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HYCOM Experiments On Flame Acceleration In Vented Tube

Experiment ID HYCOM experiments on flame acceleration in vented tube
Short Description Combustion experiments have been carried out in obstructed tube of 174 mm i.d. and 12.2 m long (DRIVER facility). Repeatable obstacles with blockage ratios 0.3 and 0.6 at distances equal to i.d. were installed.

Two typical hydrogen-air mixtures with concentrations of 10% H2 (for subsonic deflagration) and 13% H2 (for sonic deflagration) have been tested in a tube with different end venting. Ignition at various distances from the open tube. After some distance from the vent orifice flame behaviour becomes the same as for closed tube.

Figure 1: Obstructed detonation tube with end venting: α = 0-100% is a vent ratio; I are ignition positions.

Figure 2 X-t diagram of the flame propagation for different ignition positions and vent ratio α = 40%.

Figure 3 X-t diagram of the flame propagation from the open end (Xign = 0 m) and at various vent ratios α = 0-100%

What phenomena were studied Effects of the venting and ignition position from the open end on flame acceleration in obstructed tube
What phenomena / effects can be studied Effects of initial vent ratio on turbulent flame propagation in obstructed channel with end venting for subsonic and sonic regimes can be validated.

Insensitivity of flame propagation to the opening after some distance from the orifice can be validated.

Instrumentation Two types of pressure transducers (1) piezoresistive transducers D06 (natural frequency 1 kHz), and (2) piezoelectric transducers PCB-H113A (frequency 100 kHz).

Collimated germanium photodiodes (up to 23) for measurement of the time-of arrival of the flame front. Time resolution of 10 µs.

Test variables Vent ratios 0-100%

Ignition position 0 6.5 m Hydrogen concentration in air 10% and 13% Blockage ratio 0.3 and 0.6

Data description / Data completeness All pressure and photo-diode recordings in digital form
Data availability Publicly accessible
Source of data / Reference Technical Report: EU Project HYCOM, 2004; W. Breitung, S. Dorofeev, A. Kotchourko et al. Integral large scale experiments on hydrogen combustion for severe accident code validation-HYCOM. Nuclear Engineering and Design 235 (2005) 253270
Why were chosen Very well instrumented, complete description, by the moment no similar results elsewhere are available
Relevance to the project purposes Can address separate phenomena, which are of primary interest for the project purposes.
Experimental data
Results of simulations
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Page last modified on October 14, 2009, at 12:50 PM