【摘要】 对容积式超临界水热燃烧反应器内的燃料与氧化剂的混合与燃烧反应的物理化学过程进行模拟研究,揭示了反应参数、燃料特性及反应器喷嘴尺寸对反应器内温度场、浓度场和燃烧反应速率场的影响规律。研究结果表明,同轴喷射的非预混水热火焰发生化学反应的区域是狭窄的,并且反应器内的最高温度出现在以轴线上出现化学当量的轴向距离定义的火焰长度位置处。初始燃料浓度的增加会使反应器内的火焰温度升高、火焰长度延长;氧化系数的增大,不仅降低了火焰温度,并且可以缩短水热火焰长度;随着入射速度的增加,反应器内开始出现最高温度的位置远离反应器入口,火焰位置延迟。更多还原

【Abstract】 Simulation on the physical and chemical process of mixing and combustion between fuels and oxidants in a volumetric type supercritical hydrothermal combustion reactor is studied. The influences of reaction parameters,characters of fuels and nozzle size of reactor on the temperature,concentration and reaction rate fields in the reactor are discovered.It is found that during non premix hydrothermal flames the area with happening of chemical reaction is narrow,which happens only at the interface between the fuel and oxidant flows. The maximum temperature in reactor appears at the position of flame length. Both the flame temperature and flame length increases with the initial fuel concentrations.The increment of oxidation coefficient not only can decrease the flame temperature,but shortens the flame length.Finally,the distance between the flame and the reactor inlet will extend when the flow inlet velocity increases,and the flame position is delayed.更多还原