【摘要】 为粒子系太阳能反应器的设计与制造提供理论指导,利用CFD方法对粒子系反应器内的流动与传热过程进行了数值模拟,建立了能够合适的描述反应器内气固两相流动与传热的数学模型。在特定的流动状态下给反应器壁面施加不同的热流得到不同的温度场特性,并对不同的流动状态和温度场进行了对比。研究结果表明:双流体模型和k-ε湍流模型能够很好的描述粒子系反应器内的流动情况;空气速度0.1 m/s、颗粒粒径0.09 mm时反应器内流动状态为环-核流动,且反应器中气固两相的环-核流动状态要优于悬浮状态;在相同热流条件下,环-核流动状态的出口温度比悬浮状态的出口温度高50 K,但是无论是哪种热流,反应器出口的空气温度随时间的增加趋于定值。更多还原

【Abstract】 In order to provide the theoretical guidance for the design and manufacture of the solar reactor,the CFD method is used to simulate the flow and heat transfer process in the particle reactor. The gas-solid two-phase flow model and heat transfer model in the reactor are established. Under different flow conditions,different heat flow is applied to the wall of the reactor and different temperature field characteristics are obtained. On this basis,the different flow states and temperature fields are compared. The results show that: The two-fluid model and the k-ε turbulence model are well suited to describe the flow in the particle reactor. When the air velocity is 0. 1 m/s and the particle size is about 0. 09 mm,the flow state in the reactor is ring-core flow; The ring-core flow state of the gas-solid two-phase in the reactor is superior to the suspended state; Under the same heat flow conditions,the outlet temperature of the ring-core flow state is 50 K higher than the outlet temperature of the suspended state,but no matter what kind of heat flow,the outlet temperature of the reactor tends to be constant with the increase of time.更多还原