淺水深爆炸水柱模型之驗證與評估

Modal Validations and Predictions of Water Plume Behavior of Underwater Explosion near Air-Water Surface

由於爆炸水柱之水動力現象複雜且研究困難，公開之文獻極為稀少，故本論文以淺水爆炸水柱為研究對象，首先探討有限單元軟體MSC. Dytran軟體進行水下爆炸產生之水柱輪廓之模擬分析能力，利用9.1kg之TNT炸藥置於不同爆炸水深進行爆炸水柱之數值模擬，並與Michael[4]之水柱半經驗公式進行比對驗證，其次，探討三種不同炸藥重量（10kg、20kg、30kg）之TNT炸藥於不同爆炸水深度之水柱輪廓之歷時變化情形。研究結果發現密實水柱發生之時間隨著爆炸水深增加，水柱密實度延續之時間變的較長，且有延後發生之現象；另當炸藥量增加至30kg時，於較淺水深處（爆炸水深為5m）爆炸所產生之水柱將無法形成密實之水柱結構等現象。本論文之研究結果希能提供未來水屏防護設計，船艦結構與裝備及水下建築設施抗爆炸分析與設計參考使用。 The most obvious and spectacular features of underwater explosions are the disturbances of the water surface above the charge. And the overall hydrodynamic phenomena involved in this process are extremely complicated. Much of the present knowledge and understanding of this field was acquired because of the demands and the few available discussions of the subject have become inadequate or obsolete. This paper evaluates and proceeds on simulation ability of shallow depth explosion plume behavior of MSC. Dytran finite element software. Also in this paper, numerical studies of explosion plume which includes contours of the plume (plume height, plume width and plume thickness) and duration decreasing for charges fired at different depth are investigated in details using MSC. Dytran finite element software and compared with Michael's [4] empirical methodology. The studies presented in this paper attempt to supply a reasonable comprehensive account, which will be used for workers in the field of underwater explosion and others who are interested in the water Barrier Defense.