화성 임무 적용을 위한 Nerva 파생 원자로 냉각수 채널 모델

Edward W Porta, University of Nevada, Las Vegas

Abstract

화성 미션 애플리케이션을 위한 NERVA 파생 원자로 냉각수 채널 모델은 1.3m NERVA 파생 원자로(NDR) 냉각수 채널의 전산유체역학(CFD) 연구 결과를 제시합니다. CFD 코드 FLOW-3D는 NDR 코어를 통과하는 기체 수소의 흐름을 모델링하는 데 사용되었습니다. 수소는 냉각제 채널을 통해 노심을 통과하여 원자로의 냉각제 및 로켓의 추진제 역할을 합니다. 수소는 고밀도/저온 상태로 채널에 들어가고 저밀도/고온 상태로 빠져나오므로 압축성 모델을 사용해야 합니다. 기술 문서의 설계 사양이 모델에 사용되었습니다. 채널 길이에 걸친 압력 강하가 이전에 추정한 것(0.9MPa)보다 높은 것으로 확인되었으며, 이는 더 강력한 냉각수 펌프가 필요하고 설계 사양을 재평가해야 함을 나타냅니다.

NERVA-Derived Reactor Coolant Channel Model for Mars Mission Applications presents the results of a computational fluid dynamics (CFD) study of a 1.3m NERVA-Derived Reactor (NDR) coolant channel; The CFD code FLOW-3D was used to model the flow of gaseous hydrogen through the core of a NDR. Hydrogen passes through the core by way of coolant channels, acting as the coolant for the reactor as well as the propellant for the rocket. Hydrogen enters the channel in a high density/low temperature state and exits in a low density/high temperature state necessitating the use of a compressible model. Design specifications from a technical paper were used for the model; It was determined that the pressure drop across the length of the channel was higher than previously estimated (0.9 MPa), indicating the possible need for more powerful coolant pumps and a re-evaluation of the design specifications.

Keywords

Application; Channel; Coolant; Derived; Mars; Mission; Model; Nerva; Reactor

Figure 1 Nuclear Rocket Schematic Diagram
Figure 1 Nuclear Rocket Schematic Diagram
Figure 2 Fuel Element - Tip View
Figure 2 Fuel Element – Tip View
Figure 3 Fuel Element - Tie-Tube Structure (Tie-tubes are black)
Figure 3 Fuel Element – Tie-Tube Structure (Tie-tubes are black)
Figure 5 Three-Dimensional Coolant Channel Model
Figure 5 Three-Dimensional Coolant Channel Model
Figure 6 Two-Dimensional Coolant Channel Model
Figure 6 Two-Dimensional Coolant Channel Model

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