CAJ | 학술논문

富水性斜坡易产生滑坡进而形成泥石流，斜坡排水是防止地质灾害的重要手段。虹吸排水具有实时性和免动力等优势，但因斜坡排水涉及高扬程，在虹吸管内的低压环境中流动液体会发生强烈的空化现象，从而产生气液两相流。在间歇性虹吸排水过程中，如果不及时将析离的气泡带走，气泡会积聚在虹吸管顶点附近，最终破坏虹吸过程。通过对管内两相流型分析，发现只有形成完整的弹状流，才能将气泡带走，保证虹吸的长期有效。采用流体数值计算软件 FLUENT 的 VOF 模型，分别对管径为4、5、6、8 mm的虹吸管内气液两相流型进行模拟。结果表明：管径小于5 mm 的条件下，表面张力起主要作用，形成完整弹状流；管径大于6 mm 的条件下，形成附壁弹状流。该结论通过物理模型试验也得到证明。
부수성사파역산생활파진이형성니석류，사파배수시방지지질재해적중요수단。홍흡배수구유실시성화면동력등우세，단인사파배수섭급고양정，재홍흡관내적저압배경중류동액체회발생강렬적공화현상，종이산생기액량상류。재간헐성홍흡배수과정중，여과불급시장석리적기포대주，기포회적취재홍흡관정점부근，최종파배홍흡과정。통과대관내량상류형분석，발현지유형성완정적탄상류，재능장기포대주，보증홍흡적장기유효。채용류체수치계산연건 FLUENT 적 VOF 모형，분별대관경위4、5、6、8 mm적홍흡관내기액량상류형진행모의。결과표명：관경소우5 mm 적조건하，표면장력기주요작용，형성완정탄상류；관경대우6 mm 적조건하，형성부벽탄상류。해결론통과물리모형시험야득도증명。
Water-rich slopes are prone to landslides and even debris flows.Slope drainage is widely used in slope engineering as an important means of geological disasters prevention.It is known that siphon drainage has the merits of real-time and power-free however,high water level in slope drainage will generate low-pressure environment,and flow liquid shows intensive cavitations phenomenon under such circumstance,which finally leads to gas-liquid two phase flow patterns.If the bubble is not removed promptly,it will accumulate at the top of the pipe in the intermittent siphon drainage process of low flow rate,and ultimately undermine the entire siphon process.In this research,VOF model in a fluid numerical software “FLUENT”is used to analyze two-phase flow patterns,it is found that only complete slug flow could carry the bubbles off and ensure long-term stable operation of the siphon drainage.We also simulate the air and flow patterns in siphon pipes of 4,5,6 and 8 mm in diameters.Simulation results show that the surface tension plays a major role for the pipes with diameters of less than 5 mm,which can form complete slug flow.On the other hand,mural slug flow shows for those diameters are larger than 6 mm.This numerical simulation results are also been proved by physical model tests.