Theoretical Studies On The Energy Absorption Characteristic Of Gas Explosion Combustion Suppression Of SiC/Al

With the increase of mining depth and intensity, gas emission is increasing. As a result, the hidden safe trouble and the control difficulty of gas disaster are also increasing. Currently, it’s difficult to achieve effective absorption and dissipation of impact energy using steel explosion-proof door because of its poor resistance to the explosion shock wave. So protection objects are damaged by the transmitting energy. The equipment is almost no flame retardant effect. So studies on gas block materials of new efficient and its characteristics of flame quenching and energy absorption are particularly urgent. Ceramic material of 3D connected netwok is molded by using low cost of ceramic powder, and its working temperature is high. It consumes incident impact energy by breaking, and also as reinforcing phase dissipates shock wave and absorbs impact energy. This paper is based on dimensional analysis of π theorem using acoustic wave simulating gas explosion wave, and studies on acoustic attenuation characteristics by modeling acoustic model and simulation. The main research contents are as follows:Ⅰ. Using JCA model based on Biot theory, this paper establishes rigid acoustic model of porous ceramic considering viscous, inertial and thermal dissipative effects of porous media. Results of this model are in good agreement with the experimental data. At the same time, acoustical absorption coefficient α1 increases with the increase of incident frequency, besides showing the characteristic of the periodic function. On the basis of rigid acoustic model of porous ceramic, this paper introduces explosion pressure according to similar π theorem, then obtaines a new mean formula of porous material absorbing explosion wave.Ⅱ. On the basis of rigid acoustic model, this paper introduces dynamic porosity and establishes elastic acoustic model of porous ceramic considering deformation. By sensitive analysis, sensitive orders of dynamic porosity of 2D and 3D triangle configuration and composite structure for each parameter are: pressure changes ΔP<temperature changes ΔT<initial porosity Φ0<triangle length(bar length) l<wall thickness t(bar radius r); sensitive orders of acoustical absorption coefficient of 2D and 3D triangle configuration and composite structure for each parameter are: pressure changes ΔP<temperature changes ΔT<initial porosity Φ0<triangle length(bar length) l<wall thickness t(bar radius r).Ⅲ. Detonation wave produced by explosion shock includes longitudinal wave and transverse wave, and giving priority to transverse wave(front of detonation wave). According to similar engineering, this paper deduces formulas of porous material absorbing explosion wave based on the study results of chapter 2 and 3, thus endowing it waveguide absorption properties of shear wave(not longitudinal wave).