다층구조 Water Gel Barrier의 농도변화에 따른 폭발특성에 대한 실험적 연구

Experimental Studies of the Explosion Characteristics by Varying Concentrations of a Multi Layered Water Gel Barrier

Abstract

Experimental studies have been carried out to investigate characteristics of gas explosion using a multi layered water gel barrier in a vented explosion chamber. The chamber is consisted of 1600 mm in length, with a square cross-section of $100{\times}100mm^2$. The gel concentration of inner layer of MLWGB ranged from 10% to 90% with intervals of 10% by weight of gel. Displacement of the MLWGB was photographed with a measured using a high-speed video camera, and pressure development was measured using a data acquisition system. It was found that MLWGBs with 10 ~ 20% inner layer concentrations were ruptured during the explosions. As the concentrations of inner layer increased from 30% to 90%, the barriers were not ruptured. As the gel concentrations of the inner layer increased, the displacement increased toward the chamber exit and the pressure decreased for the ruptured barriers. It was found that the pressure attenuation obtained from the MLWGB was higher than that of the single water gel barrier. For the cases of non-ruptured barriers, the pressure inside the chamber less increased with increasing gel concentrations of the inner layer. It was also found that the displacement moved back into the chamber for non-ruptured MLWGBs, and it was sensitive to the gel concentrations.

Fig. 1. Schematic diagram.

Fig. 2. Left) Gel displacement images. Right) Pressure/gel displacement versus time for O₁₀₀I₂₀.

Fig. 3. Left) Gel displacement images. Right) Pressure/gel displacement versus time for O₁₀₀I₉₀.

Fig. 4. Gel displacements for cases of O₁₀₀I₁₀ and O₁₀₀I₂₀.

Fig. 5. Gel displacements for cases from O₁₀₀I₃₀ to O₁₀₀I₉₀.

Fig. 6. Comparison of Pressure time histories of both MLWGB and SLWGB : (a) O₁₀₀I₂₀ and (b) T₂₀C₂₀.

Fig. 7. Pressure-time histories for cases from O₁₀₀I₃₀ to O₁₀₀I₉₀.

Table 1. Thickness and concentrations of MLWGB and SLWGB used in the tests