직접접촉 응축 시 증기제트의 열수력 특성에 대한 실험적 연구 = Experimental Study on the Velocity of Steam jet in Direct Contact Condensation

다국어 초록 (Multilingual Abstract)

The SDVS (Safety Depressurization and Vent System) in the APR1400 is designed to cope with some DBEs (Design Bases Events) and beyond-DBEs related to overpressurization of the RCS (Reactor Coolant System). When the POSRV (Power Operated Safety Relief Valve) is actuated, steam from the pessurizer is discharged to the IRWST(In-containment Refueling Water Storage Tank) through I-spargers. The APR1400 When injected steam is condensed in the pool, it induces water motions and temperature variations in the pool, which effects on the steam jet condensation, vice versa. In the design of such system, thermal mixing analysis is used to predict the efficient pool mixing, dynamic load, and the IRWST design improvement, etc.

For the modelling of the CFD analysis, understanding of the turbulent jet induced by the steam jet condensation would be necessary to get some physical insights of related phenomena. A turbulent jet induced by steam jet condensation in a water pool was investigated experimentally. An experimental apparatus called GIRLS was used, which consists of a steam boiler, a single-hole steam sparger, and a water pool, etc. For the measurements, pitot tube and thermocouples were used for flow velocity and temperatures, respectively. Overall flow shapes of the turbulent jet by the steam jet condensation are similar to those of axially symmetric turbulent jet flows. The angular coefficients of turbulent rays are quantatively comparable between the traditional turbulent jet flows and the turbulent jet flows induced by the steam jet condensation in this work. Although the turbulent flows were induced by the steam jet condensation, general theory of turbulent jets was found to be applicable to the turbulent flows of this work.

목차 (Table of Contents)

• Ⅰ.서론 1
• 1.1 연구배경 1
• 1.2 증기제트에 관한 연구동향 및 개요 2
• 1.2.1 직접접촉 증기응축 영역도 2
• 1.2.2 증기제트 응축열전달 계수 8
• 1.2.3 증기제트 Plume 특성 12
• 1.3 연구의 목표 및 내용 15
• Ⅱ. 실험장치 및 실험방법 17
• 2.1 실험장치 17
• 2.1.1 증기발생기 계통 17
• 2.1.2 GIRLS 실험장치의 몸체 21
• 2.1.3 3D-Traverse System 24
• 2.1.4 Pitot Tube 26
• 2.1.5 자료 취득 장치 30
• 2.2 실험방법 및 실험조건 34
• Ⅲ. 실험결과 및 고찰 36
• 3.1 증기제트 형상 36
• 3.1.1 증기제트의 팽창비 41
• 3.1.2 증기제트 길이 42
• 3.2 평균 응축 열전달 계수 46
• 3.3 증기제트 난류유동 특성 49
• Ⅵ.결론 57
• Reference 59