Experimental study on effect of large-scale explosion venting component on interior deglagration pressure

The effect of the large-scale explosion venting component on the interior deflagration pressure at different volume fractions of ethylene was studied by installing a vent panel on the end of the cavity whose size is 2 m×1.2 m×0.6 m. Two vent panels with different vent static-pressures were selected to be tested under the ethylene volume fraction ranging from 4% to 11% and three typical pressure-time curves were obtained. The result shows that the actual breakdown-pressure of the vent component was larger than that under a static load and there existed a maximum breakdown-pressure under the optimum concentration. The opening duration of the vent component had an important impact on the cavity interior pressure and it was as much as up to several tens of milliseconds at low-concentration. However, the opening duration was only a few milliseconds at stoichiometric concentration and the Lee JHS model still has good applicability for a rectangular cavity with a large-scale venting component. When the ethylene volume fraction is high, the large-scale venting component would cause the outside air to pour into the cavity and react with unburned gas as a result of having an overly large relief area, thereby leading to a secondary explosion, so increasing the relief area would bring damage to the structure under a high volume fraction.