| Summary: | 碩士 === 國防大學理工學院 === 軍事工程碩士班 === 97 === This study investigates the effects of a blast wall subjected to the blast wave on the attenuation of the pressure behind the wall by means of numerical simulation and by considering the fluid-structure interaction. Based on the maximum effective pressure of eardrums and lungs, four parameters, such as the amount of the explosive, the location of the explosive, the sizes of the wall and the measuring points behind the wall are also considered in the study. The analytical results are used to predict the safe quantity-distance, to evaluate the protective capacity of the wall, and to serve as the basis in the design of the balst wall.
The results show that a blast wall effectively reduce the blast pressure and that the effective distance is approximately the distance behind the wall equal to 1-2 times of the height of the wall. However, if the ratio of the height to the width of the wall is 1:2, the pressure behind the wall increases due to the travelling path of the diffractive wave. That results in the failure of the protection of the wall. The blast wall dramatically reduces the pressure behind the wall as it is close to the explosive without being damaged. By increasing the distance behind the wall, the pressure gradually tends to the one with the free field case. The sizes of the wall directly affect the effective distance behind the wall. As the measuring point is within the effective distance and is above the ground, a higher wall provides the more effective protection than the lower one. A wider wall also provides the more effective protection as the measuring point is within the effective distance.
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