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自然循环两相流不稳定性研究对于核反应堆及其它传热设备具有重要意义。文中论述了在低压低含汽量自然循环系统密度波不稳定性方面所作的理论研究。介绍了在发展两相流密度波不稳定性分析方法,包括漂移流模型及非线性研究方面所取得的进展。描述了在自然循环两相流系统稳定边界及其影响因素研究,两相流密度波振荡的非线性特性研究,以及动态过程不稳定性研究等方面取得的结果。此外文章从理论上探讨了利用非平衡态热力学广义超熵产生判据以建立两相流不稳定性的能量原理的可能性,同时初步研究了谱熵特性,以揭示两相流不稳定性的物理本质。最后,文章阐述了在利用两相流不稳定性研究结果改进低温核供热堆安全设计方面的应用情况。
Natural circulation Two-phase flow instability research for nuclear reactors and other heat transfer equipment is of great significance. In this paper, the theoretical research on the density wave instability of low-pressure and low-volume natural circulation system is discussed. The progress in the development of two-phase flow density wave instability analysis methods, including the drift flow model and nonlinear studies, is introduced. The results of the research on the stability boundary of natural circulation two-phase flow system and its influencing factors, the nonlinear characteristics of two-phase flow density wave oscillation and the research on the dynamic process instability are described. In addition, the paper theoretically explores the possibility of using the principle of generalized hyperi-entropy of non-equilibrium thermodynamics to establish the energy principle of the instability of two-phase flow. At the same time, the spectral entropy characteristics are studied preliminarily to reveal the instability of two- Physical essence. Finally, the article expounds the application of improving the safety design of low-temperature nuclear heating reactor by using the research results of two-phase flow instability.