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CFD를 이용한 머드 탱크 2축 교반기의 회전방향에 따른 교반성능 연구
임효남(Hyo-Nam Im),이희웅(Hee-Woong Lee),이인수(In-Su Lee),최재웅(Jae-Woong Choi) 한국해양공학회 2014 韓國海洋工學會誌 Vol.28 No.2
In drilling process of oil wells, the drilling fluid such as mud keeps the drill bit cool and clean during drilling, with suspending drill cuttings and lubricating a drill bit. In this paper, a commercial CFD package(ANSYS Fluent 15.0) was used to solve the hydrodynamic force and evaluate mud mixing time in the mud mixing tank on offshore drilling platforms. Prediction of power consumption in co-rotating and counter-rotating models has been compared with results of Nagata"s correlation equation. This research shows the hydrodynamic effect inside the two phase mud mixing tank according to rotating directions(co-rotating and counter-rotating). These results, we can conclude that the co-rotating direction of the two shafts with mixing blade in the mud mixing tank can be a preferable in power consumption and mixing time reduction.
플레어 팁 축소 모형을 이용한 Flaring 소음 연구
박성종(Seongjong Park),김종원(Jongwon Kim),김한울(Hanwool Kim),이재훈(Jaehoon Lee),임효남(Hyo-Nam Im),이희성(Heesung Lee),이동연(Dongyeon Lee) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
Flare system on offshore production facilities is a safety device for burning and discharging residual gas from oil or gas wells. When flaring occurs, gas is burnt off combining with air on the flare tips, which releases high noise to the surroundings. Therefore, flaring noise has to be strictly controlled to protect workers hearing and countermeasures against the noise are taken into account at the design stage. In general, the study of flaring noise effect on working environment has been dependent on noise calculation or the data provided by flare tip manufacturers. However, the reliability of the noise data is insufficient to take appropriate measures and it is difficult to verify the noise data due to the lack of experience and database. In this study, in order to assess the characteristics of flaring noise, a series of combustion experiments has been carried out using flare tip scale models. Flaring noise are measured at steady-state with intervals of 5.0 m from the center of flare tips with varying the shape, size and gap of the tip nozzle and gas flow rate. In addition, the measured flaring noise levels are compared to calculated results from the commercial software.