600 MW超临界W火焰锅炉流动不稳定性数值分析
Numerical Analysis on the Flow Instability of a 600 MW Supercritical W Flame Boiler

建立了适用于超临界锅炉流动不稳定性分析的通用数值计算模型,编写了以Fortran语言为基础的流动不稳定性数值计算程序,对程序进行验证后,采用时域法对600 MW超临界W火焰锅炉的流动不稳定性进行了模拟。计算得到了W火焰锅炉的水动力特性曲线,并研究了系统参数对其动态流动不稳定性的影响。结果表明:该模型对模拟超临界水流动不稳定性具有一定的可靠性;在0.09～0.3 kg/s的流量参数范围内,压降？擦髁刻匦郧？线始终为单值关系,静态流动不稳定性不会发生;当进口压力由25 MPa增大到27 MPa或进口流量由0.091 kg/s增加到0.1 kg/s时,流量脉动的振幅逐渐减小,表明增加进口压力或进口流量锅炉的稳定性提高;当进口阻力系数由10减小到0.5或出口阻力系数由1增大到5时,流量脉动的振幅逐渐增大,表明减小进口阻力系数或增大出口阻力系数锅炉的稳定性降低。
A general numerical computational model suitable for the analysis of supercritical boiler instability was established, and the numerical computational program based on Fortran was developed. Then the flow instability of a 600 MW supercritical W flame boiler was simulated by the time？？domain method after the model and code were verified. The curve of pressure drop versus flow rate was obtained and the parametric effects on the dynamic instability of the W flame boiler were analyzed. The results showed that the model is reliable to simulate the supercritical water instability; the curve of pressure drop versus flow rate is always an one？？on？？one relationship at the flow rate range from 0.09 to 0.3 kg/s, which means the static flow instability does occur; when the inlet pressure increases from 25 to 27 MPa or the inlet flow rate increases from 0.091 to 0.1 kg/s, the amplitude of flow rate oscillation decreases, indicating that increasing inlet pressure or inlet flow rate will improve the boiler’s stability; when the inlet pressure drop coefficient decreases from 10 to 0.5 or the outlet pressure drop coefficient increases from 1 to 5, the amplitude of flow rate oscillation increases, indicating that decreasing the inlet pressure drop coefficient or increasing the outlet pressure drop coefficient will reduce the boiler’s stability