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Density wave oscillations (DWOs) of
Density wave oscillations (DWOs) of supercritical water in the parallel water wall channels of an ultra-supercritical circulating fluidized bed (CFB) boiler were investigated experimentally and numerically. The variation ranges are presented as follows: pressure from 23 MPa to 30 MPa, mass flow rate from 0.06 kg·s −1 to 0.22 kg·s −1 , inlet water temperature from 200 °C to 370 °C. Wall temperatures increase rapidly after DWOs occur. As the period decreases, the flow departs significantly from the quasi-steady conditions and the penetration of the variation of the flow toward the wall is significantly reduced. A general calculation model based on the time-domain method was established to analyze DWOs in parallel channels. Four pulsation patterns were found during calculation, that is, pulseless oscillation, damped oscillation, self-sustaining periodic oscillation with constant amplitude, and divergent oscillation. The mechanism of DWOs was investigated through experimentally and numerically results. Results show that mass flow rate of each channel displays a reverse-phase pulsation during the oscillations. DWOs are intertube oscillations with a short period and small amplitude. Increases in inlet pressure drop coefficient or decreases in outlet pressure drop coefficient are conducive to system stability
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在超临界循环流化床的平行水壁通道的超临界水密度波振荡（DWOs）（CFB）锅炉进行了实验和数值研究。的变化范围被表示为如下：压力从23兆帕至30兆帕，质量流率从0.06千克·秒-1至0.22千克·秒-1，进水温度从200℃至370℃。发生DWOs后壁面温度迅速增加。作为周期减小时，流显著从准稳态条件出发并朝向壁流动的变化的渗透显著降低。建立了基于时域的方法的一般计算模型来分析在平行通道DWOs。计算过程中，发现四种脉动模式，即，无脉振荡阻尼振荡，自持具有恒定幅度，并且发散振荡周期振荡。DWOs的机理是通过实验和数值结果的影响。结果表明在振荡反相脉动各信道的显示的是质量流率。DWOs是管间振荡以短周期和小振幅。在入口压降系数增加或出口的压降系数减小，有利于系统的稳定性
正在翻译中..
Density wave oscillations (DWOs) of supercritical water in the parallel water wall channels of an ultra-supercritical circulating fluidized bed (CFB) boiler were investigated experimentally and numerically. The variation ranges are presented as follows: pressure from 23 MPa to 30 MPa, mass flow rate from 0.06 kg·s −1 to 0.22 kg·s −1 , inlet water temperature from 200 °C to 370 °C. Wall temperatures increase rapidly after DWOs occur. As the period decreases, the flow departs significantly from the quasi-steady conditions and the penetration of the variation of the flow toward the wall is significantly reduced. A general calculation model based on the time-domain method was established to analyze DWOs in parallel channels. Four pulsation patterns were found during calculation, that is, pulseless oscillation, damped oscillation, self-sustaining periodic oscillation with constant amplitude, and divergent oscillation. The mechanism of DWOs was investigated through experimentally and numerically results. Results show that mass flow rate of each channel displays a reverse-phase pulsation during the oscillations. DWOs are intertube oscillations with a short period and small amplitude. Increases in inlet pressure drop coefficient or decreases in outlet pressure drop coefficient are conducive to system stability
正在翻译中..
对超超临界循环流化床（CFB）锅炉水冷壁通道内超临界水的密度波振荡进行了实验和数值研究。其变化范围为：压力23mpa～30mpa，质量流量0.06kg·s-1～0.22kg·s-1，进水温度200～370℃。DWOs发生后壁温迅速升高。随着周期的减小，流动明显偏离准稳态条件，流动对壁面的穿透力明显减小。建立了基于时域法的通用计算模型，分析了并行信道中的dwo。计算中发现了四种脉动模式，即无脉动振荡、阻尼振荡、自持恒幅周期振荡和发散振荡。通过实验和数值模拟研究了DWOs的形成机理。结果表明，在振荡过程中，各通道的质量流量均呈现反向脉动。dwo是短周期、小振幅的管间振荡。入口压降系数增大或出口压降系数减小有利于系统稳定
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