A methodology to predict shock overpressure decay in a tunnel produced by a premixed methane/air explosion |
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| Institution: | 1. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China;2. Department of Civil Engineering, North China Institute of Science and Technology, Box 206, Yanjiao, Bei Jing Dong, Beijing 101601, China;1. Istituto di Ricerche sulla Combustione, CNR, Piazzale Tecchio 80, 80125 Napoli, IT, Italy;2. Dipartmento di Ingegneria Chimica, Mineraria e delle Tecnologie Ambientali, Alma Mater Studiorum, Università di Bologna, Via Terracini 28, 40131 Bologna, IT, Italy;3. Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli Federico II, Piazzale Tecchio 80, 80125 Napoli, IT, Italy;1. University of Tehran, Tehran, Iran;2. Amirkabir University of Technology, Tehran, Iran |
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| Abstract: | A methodology for estimating the blast wave overpressure decay in air produced by a gas explosion in a closed-ended tunnel is proposed based on numerical simulations. The influence of the tunnel wall roughness is taken into account in studying a methane/air mixture explosion and the subsequent propagation of the resulting shock wave in air. The pressure time-history is obtained at different axial locations in the tunnel outside the methane/air mixture. If the shock overpressure at two, or more locations, is known, the value at other locations can be determined according to a simple power law. The study demonstrates the accuracy of the proposed methodology to estimate the overpressure change with distance for shock waves in air produced by methane/air mixture explosions. The methodology is applied to experimental data in order to validate the approach. |
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| Keywords: | Methane-air Shock wave Overpressure Explosion |
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