Based on the homogeneous flow model ,the mathematic model of optimization of inside rifled tube under non‐uniform heating condition which included horizontal flow ,inclined upward flow , vertical upward flow and vertical downward flow was established .The two‐phase flow instability was simulated by the time‐domain approach . With the same parameters as the Siemens ,the variation of inlet flow rate with time was obtained .It is shown that the results have a good agreement with those of the Siemens . Therefore ,the mathematic model and numerical method were reliable to simulate the two‐phase flow instability . The parametric effects on the two‐phase flow instability under non‐uniform heating condition were analyzed and compared with the effects under uniform heating condition . The results show that they are similar to those under uniform heating condition ,which indicates that increasing inlet pressure or inlet flow rate will improve the system stability ,and decreasing the inlet pressure drop coefficient or increasing the outlet pressure drop coefficient will reduce the system stability .%针对蒸发管非均匀加热工况，采用包含水平、倾斜上升、垂直上升和垂直下降流动的优化内螺纹管，建立了基于均相流模型的蒸发管数学模型，采用时域法模拟了蒸发管内两相流动不稳定性。计算了不稳定发生时，进口流量在各时间点的数值，并与 Siemens 公司的计算结果进行了对比，结果符合良好，表明本文采用的数学模型和数值方法在模拟两相流动不稳定性上具有一定的可靠性。分析了系统参数对两相流动不稳定性的影响，并与均匀加热工况进行了比较。结果表明：非均匀加热工况系统参数影响规律与均匀加热工况具有相似性，增加进口压力或进口流量系统的稳定性提高；减小进口阻力系数或增大出口阻力系数系统的稳定性降低。
展开▼
