Numerical analysis of influence of geometry and operating parameters on Ledinegg and dynamic instability on supercritical water natural circulation loop

2020 ◽  
Vol 369 ◽  
pp. 110830
Author(s):  
Santosh Kumar Rai ◽  
Pardeep Kumar ◽  
Vinay Panwar
Keyword(s):  
Numerical Analysis ◽  
Supercritical Water ◽  
Dynamic Instability ◽  
Natural Circulation ◽  
Circulation Loop ◽  
Operating Parameters ◽  
Natural Circulation Loop

Stability Analysis of a Supercritical Water Natural Circulation Loop

2012 ◽  
Author(s):  
ZhongChun Li ◽  
JiYang Yu ◽  
XiaoMing Song
Keyword(s):  
Supercritical Water ◽  
Natural Circulation ◽  
Basic Research ◽  
Circulation Loop ◽  
Two Phase ◽  
Water Reactor ◽  
Natural Circulation Loop ◽  
The Stability ◽  
Engineering Physics ◽  
Supercritical Water Reactor

As a part of “supercritical water reactor basic research”, the stability of the natural circulation research plays an important role on the feasibility of supercritical water reactor and experiment research. In this paper, the stability of a supercritical water natural circulation loop built by Department of Engineering Physics, Tsinghua University was studied by numerical method. It was confirmed that the static or Ledinegg instability doesn’t occur in HACA system, and there are no instabilities existing when the inlet enthalpy is larger than critical enthalpy. Instability was observed by numerical way, which is similar to DWOs and PDOs in two phase natural circulation loop. The system parameters’ influence on the instability of supercritical natural circulation loop was studied.

Numerical Simulations on Supercritical Water Flow Instability

2014 ◽  
Author(s):  
Jingjing Li ◽  
Tao Zhou ◽  
Mingqiang Song ◽  
Yanping Huang
Keyword(s):  
Numerical Simulations ◽  
Water Flow ◽  
Mass Flow ◽  
Supercritical Water ◽  
Flow Instability ◽  
Natural Circulation ◽  
Heating Power ◽  
Circulation Loop ◽  
Natural Circulation Loop ◽  
Parallel Channels

3-D simulation of supercritical water flow instability in parallel channels and a natural circulation loop are presented. Results are obtained for various heating powers. The results show that, in the natural circulation loop the steady state mass flow will firstly increase with the heating power and then decrease. And mass flow grows with the growing of the inlet temperature, decreases with the growing of system pressure. Under a large heat flux, the parallel channels will experience the flow instability of out phase mass flow oscillation. And the oscillation amplitude will grow with the growing of heating power. At last, the numerical simulations are validated by B.T. Swapnalee’s experience formula.

Supercritical Natural Circulation Loop

2017 ◽  
pp. 188-214
Author(s):  
Dipankar Narayan Basu ◽  
Milan Krishna Singha Sarkar
Keyword(s):  
Nuclear Reactors ◽  
Natural Circulation ◽  
Point Of View ◽  
Circulation Loop ◽  
Working Fluid ◽  
Operating Parameters ◽  
System Behavior ◽  
Natural Circulation Loop ◽  
Stability Point ◽  
Future Direction

Supercritical natural circulation loop is a compelling technology for cooling of modern nuclear reactors, which promises enhanced thermalhydraulic performance in a simple design. Being a new concept, related knowledge base is relatively thin and involves several conflicting theories and controversies. Present chapter summarizes the observation till date, starting from the very fundamentals. The phenomenon of natural circulation and suitability of supercritical medium as working fluid are discussed in details. Different methods of analyses, including analytical, simple 1-D numerical and multidimensional computational codes, as well as experimental, are elucidated. A comprehensive discussion is presented about the effect of various geometric and operating parameters on the system behavior, from both thermalhydraulic and stability point of view. Finally, a few recommendations are included about the operation of such loops and future direction of research.

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