우수관로 내부 2상 유동 해석에 따른 한계소류력 관계식 제안 = Development of Correlations for Critical Tractive Force Estimation using Two-Phase Flow Analysis in Sewer Conduit

국문 초록 (Abstract)

우수관거의 치수능력을 유지하고 홍수시 침수를 방지하기 위해 관거 내부에서의 더 많은 흐름특성을 이해하는 것은 매우 중요하다. 관 내부의 유출량 거동에 영향을 미치는 요소에는 관거 내부로 함께 유입되는 토사 슬러리가 있으며 이송·침전 과정을 거쳐 퇴적층을 형성할 때 통수능 저하에 따른 문제를 야기시킨다. 토사 슬러리는 유체와 혼합된 상태로 관거로 유입된다. 관 내부에서의 난류 에너지와 에너지 소산으로 인해 분리현상을 일으키며 하상에 퇴적을 형성할 경우 관거 통수능 저하의 주요 문제점이 된다. 우수관거로 유입되는 토사 슬러리에 대한 거동 특성을 파악하고 이송·침전의 원인을 분석할 필요가 있다. 본 연구에서는 우수관거 내부로 유입되는 토사 슬러리를 고려하여 관거 내부의 유체와 토사 슬러리를 동시에 고려한 2상 유동 흐름의 분석조건을 난류흐름의 관점에서 도출하고자한다. 우수관거 내부 흐름에 대한 수치해석 모델링을 실시하였으며, Navier-Stokes 방정식과 k-ε 난류모델의 반영을 통해 실제 우수관거 내부에서의 유체와 토사 슬러리의 흐름에 대하여 분석하였다. 우수관 내부 토사 슬러리의 이송·침전 현상을 검토하였으며, 결과들을 바탕으로 한계소류력 산정을 통해 관 내부에서 발생하는 이송·침전에 대한 기준을 제안하였다.

다국어 초록 (Multilingual Abstract)

It’s important to understand a lot more flow properties in sewer conduit in order to maintain the flood control capacity, and to prevent flooding an urban inundation. There is soil slurry flowing inside the conduit together in the influencing elements on runoff behavior and causes a problem consequent on the decline in discharge capacity when it forms a sedimentary layer through the transport·deposition process. Soil slurry flows in conduit in a state mixed with a fluid. There arises a separation phenomenon due to the turbulent energy and energy dissipation inside the conduit, and in case sedimentation forms in a bed, it becomes a major problem of the decline in discharge capacity. Therefore, it is there is a need to grasp the behavior property of soil slurry, and to analyze the reason for its transport·deposition process. In this study, the soil slurry incoming the storm sewer conduit was considered, two-phase flow analytical conditions considering both the fluid and soil slurry in the conduit are to be derived from the perspective of the turbulent flow. This study conducted the numerical value analysis modeling of the internal flow and analyzed both the fluid and soil slurry inside an actual conduit through the reflection of Navier-Strokes equation and k-ε turbulence model. This study examined the transport·deposition phenomenon occurring inside the conduit, and proposed the standard of the transport·deposition occurring inside the conduit through the critical tractive force assessment on the basis of results.

목차 (Table of Contents)

• Abstract
• 요지
• 1. 서론
• 2. 계산방법 및 해석조건
• 3. 수치해석 결과
• 4. 토사 슬러리의 한계소류력(θc) 관계식 제안
• 5. 결론
• 감사의 글

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