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自然循环条件下,矩形通道内的临界热流密度(CHF)发生受到很多因素影响,目前对其特征的把握尚不完善。将本研究中得到的实验结果与Katto的强迫循环和Zhang的自然循环两种CHF模型的计算值进行比较,分析两种模型在实验条件下的适用性以及入口流速、出口质量含汽率和压力对CHF的影响。研究表明:Katto模型的计算结果普遍高于实验值,而Zhang模型的计算结果与实验值符合较好。随着入口流速的增大,自然循环和强迫循环CHF均逐渐增大;随着出口质量含汽率的增大,两类循环的CHF均减小;随着压力的增大,两类循环的CHF都增大,而在较大压力条件下自然循环CHF的增长速率随系统压力的增大而减小。
Under natural circulation conditions, the occurrence of critical heat flux density (CHF) in rectangular channels is affected by many factors. At present, its characteristics are not well understood. The experimental results obtained in this study were compared with the calculated values of the forced circulation of Katto and the natural circulation of Zhang, and the applicability of the two models in experimental conditions as well as the inlet flow rate, outlet mass flow rate and pressure Impact on CHF. The results show that the calculated results of Katto model are generally higher than the experimental values, while the calculated results of Zhang model are in good agreement with the experimental ones. With the increase of inlet velocity, both natural circulation and forced circulation CHF increase gradually. With the increase of outlet steam content, the CHF of both circulation decreases. With the increase of pressure, two kinds of cyclic CHF increases, while the growth rate of natural circulation CHF decreases with the increase of system pressure at higher pressure.