不同辐射模型对太阳能烟囱数值模拟影响研究

以太阳能烟囱发电（SCPP）系统为研究对象,比较定热流密度、离散纵坐标（DO）辐射模型、表面对表面（S2S）辐射模型对SCPP温度、速度等性能模拟结果,将3种模型模拟结果与试验数据对比,选择更合适的辐射模型应用于SCPP数值模拟。结果表明,S2S辐射模型集热棚出口流体最大速度比定热流密度和DO辐射模型分别高0.13、0.36 m/s;S2S辐射模型沿烟囱入口流体最大湍流黏度比定热流密度和DO辐射模型分别高16.87%、8.44%;定热流密度、DO辐射模型、S2S辐射模型沿集热棚半径流体温度与试验结果的误差分别为3.09%、0.98%、10.14%。DO辐射模型更适合SCPP系统的数值模拟计算。

INFLUENCE OF DIFFERENT RADIATION MODELS ON NUMERICAL SIMULATION OF SOLAR CHIMNEY

The solar chimney power plant（SCPP）system is taken as the research object. The simulation results of SCPP temperature and velocity by constant heat flux, discrete ordinate （DO） radiation model and surface to surface （S2S） radiation model were compared. The simulation results of the three models were compared with the experimental data, and a more suitable radiation model was selected for SCPP numerical simulation.The results show that the maximum fluid velocity of S2S radiation model is 0.13 m/s and 0.36 m/s higher than that of constant heat flux and DO radiation model, respectively. The maximum turbulent viscosity of the S2S radiation model along the inlet of the chimney is 16.87% and 8.44% higher than that of the constant heat flux and DO radiation model, respectively. The errors of the fluid temperature along the radius of the heat collecting shed are 3.09%, 0.98% and 10.14%, respectively, for the constant heat flux, DO radiation model and S2S radiation model. DO radiation model is more suitable for SCPP numerical model.