An analysis of peak overpressures in vented gaseous explosions

Effect of hydrogen concentration on vented explosion overpressures from lean hydrogen–air deflagrations

“…The experimental results presented here are a combination of existing test data from previous studies [11,12] with additional tests performed at different concentrations. The results of the tests are summarized in Table 1, along with values for the mixture properties used in the model for each concentration.…”

“…These individual pressure peaks, however, can each be evaluated using a principle similar to previous simplified analytical models [1e3]. The present model has been described in detail in previous work [11,12]; thus only the important expressions from the model and the general rationale behind them are outlined in the present paper. The maximum overpressure achieved during vented explosions occurs when the production of combustion products due to a flame propagating is equal to the rate of venting:…”

“…The model was then compared to the experimental results for stoichiometric propaneeair mixtures [11] and was further extended to different fuels, enclosure sizes and additional experimental results previously reported by other investigators [12].…”

CFD simulation of hydrogen deflagration in a vented room

“…Four characteristic overpressure peaks were identified: The first one took place because of the opening of the vent, the second one was caused by the external explosion of the fuel which has been pushed outside the room during the initial stages of the explosion, the third one by the reduction of the combustion rate when the flame touches the walls and the last one by the instabilities which enhance the combustion process because of flame-acoustic interaction. A recent analysis of the peak overpressures in vented explosion has been made by Chao et al in [3], where the effects of fuel, enclosure size, ignition location, vent size and obstacles were examined. Special attention to external explosion has been paid by several authors such as Harrison and Eyre (1987) [4], Jiang et al (2005) [5], Ferrara et al (2008) [6], and Proust and Leprette (2010) [7].…”

Effects on external pressures caused by vented explosion of methane‐air mixtures in single and connected vessels

“…Molkov et al presented a simulation method to reveal the nature of the complex simultaneous interactions between flow, turbulence, and combustion inside the enclosure and in the atmosphere. Chao et al found that the maximum pressure might be caused by pressure transients and controlled by the interplay of the maximum‐flame area, the burning velocity, and the external explosion pressure. A simple model was proposed to estimate the maximum pressure for each of the main pressure transients.…”