摘要
本论文针对高温气冷堆螺旋管式直流蒸汽发生器中可能存在的两相流不稳定性进行理论研究。将对流蒸发过程分为单相水区、两相区及过热蒸汽区。单相水及过热蒸汽区采用不可压缩假设,两相区采用均相流模型。针对三个区域的控制方程采用小扰动线性化、拉普拉斯变换等方法进行分析,分别推导出了相应的流量脉动与压降脉动的频域传递函数。再利用单相水区与两相区,两相区与过热蒸汽区的边界将三个区域的传递函数相联系,得到了直流蒸汽发生器螺旋管对流蒸发过程的流量脉动与压降脉动的传递函数。通过求解传递函数的内奎斯特曲线,采用内奎斯特判据即可判定螺旋管式直流蒸汽发生器的两相流稳定性及其稳定边界。然后利用前人的实验结果对本文提出的模型及方法进行了验证。采用上述模型及方法对高温气冷堆螺旋管式直流蒸汽发生器两相流稳定性进行了分析,给出了其稳定性边界。
Two-phase flow instabilities in the helical tube steam generator of high temperature gas-cooled reactor(HTGR) are studied theoretically.The convective evaporation process in helical tube is divided into preheating region,two-phase flow region and superheated region.Incompressible assumption is used for preheating region and superheated region,and homogeneous equilibrium model is used for two-phase flow region.The transfer functions in frequency domain are derived for three regions by using small perturbation linearization method and Laplace transform.These transfer functions in the three regions are connected using the boundaries among these regions,and the total transfer function between flow fluctuation and pressure drop fluctuation of convective evaporation process in the helical tube steam generator is obtained.By solving the Nyquist curve of the transfer function,the two phase flow instability of the HTGR helical tube once through steam generator can be determined using Nyquist theory.The model and method proposed in this paper is validated using previous experimental results.The two-phase flow stability of HTGR helical tube once through steam generator is analyzed using the new method,and its stability boundary is obtained.
作者
梁骞
李晓伟
阎慧杰
苏阳
吴莘馨
LIANG Qian;LI Xiao-Wei;YAN Hui-Jie;SU Yang;WU Xin-Xin(Institute of Nuclear and New Energy Technology, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Tsinghua University, Beijing 100084, China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2019年第10期2388-2394,共7页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51576103)
国家科技重大专项资助项目(No.ZX06901)
