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从理论上研究了单相自然循环流动的不稳定性。通过将自然循环回路中流体的动量方程，能量方程无量纲化，导出影响自然循环流动的无量纲数。将流体温度和流量分解为稳态及扰动部分，代入动量、能量方程以得出扰动方程。求解扰动方程以找出稳定区及不稳定区的边界线和临界点。本文还研究了自然循环回路中冷、热源中心点间高度差的变化对稳定性的影响。
The instability of single-phase natural circulation is theoretically studied. By dimensionless the energy equation and energy equation of the fluid in the natural circulation loop, the dimensionless numbers that affect the natural circulation flow are deduced. The fluid temperature and flow decomposition into steady-state and perturbation part, into the momentum and energy equations to derive the perturbation equation. Solve the perturbation equation to find out the boundary line and the critical point of the stable area and the unstable area. In this paper, the influence of the variation of the height difference between the cold and heat source centers in the natural circulation loop on the stability is also studied.