太阳法向直射辐射(direct normal irradiance,DNI)是太阳能光热发电系统(concentrating solar thermal power,CSP)的主要能量来源,准确地选取典型年光资源就显得尤为重要,典型年光资源形成及分析方式没有统一的规程规范。以我国西北地...太阳法向直射辐射(direct normal irradiance,DNI)是太阳能光热发电系统(concentrating solar thermal power,CSP)的主要能量来源,准确地选取典型年光资源就显得尤为重要,典型年光资源形成及分析方式没有统一的规程规范。以我国西北地区某地四种来源(气象站、NASA、Meteonorm、实测站)辐射数据为基础,采用气象统计学原理,提出一种适合光热电站太阳能资源评估方法,得出该地工程代表年DNI为1 885 kWh/m2。展开更多
This study has identify useful reduced mechanisms that can be used in computational fluid dynamics (CFD) simulation of the flow field, combustion and emissions of gas turbine engine combustors. Reduced mechanisms less...This study has identify useful reduced mechanisms that can be used in computational fluid dynamics (CFD) simulation of the flow field, combustion and emissions of gas turbine engine combustors. Reduced mechanisms lessen computational cost and possess the ability to accurately predict the overall flame structure, including gas temperature and species as CH4, CO and NOx. The S-STEP algorithm which based on computational singular perturbation method (CSP) is performed for reduced the detailed mechanism GRI-3.0. This algorithm required as input: the detailed mechanism, a numerical solution of the problem and the desired number of steps in the reduced mechanism. In this work, we present a 10-Step reduced mechanism obtained through S-STEP algorithm. The rate of each reaction in the reduced mechanism depends on all species, steady-state and non-steady state. The former are calculated from the solution of a system of steady-state algebraic relations with the point relaxation algorithm. Based on premixed code calculations, The numeric results which were obtained for 1 atm ≤ Pressure ≤ 30 atm and 1.4 ≤ ф ≤ 0.6 on the basis of the ten steps global mechanism, were compared with those computed on the basis of the detailed mechanism GRI-3.0. The 10-step reduced mechanism predicts with accuracy the similar results obtained by the full GRI-3.0 mechanism for both NOx and CH4 chemistry.展开更多
文摘太阳法向直射辐射(direct normal irradiance,DNI)是太阳能光热发电系统(concentrating solar thermal power,CSP)的主要能量来源,准确地选取典型年光资源就显得尤为重要,典型年光资源形成及分析方式没有统一的规程规范。以我国西北地区某地四种来源(气象站、NASA、Meteonorm、实测站)辐射数据为基础,采用气象统计学原理,提出一种适合光热电站太阳能资源评估方法,得出该地工程代表年DNI为1 885 kWh/m2。
文摘This study has identify useful reduced mechanisms that can be used in computational fluid dynamics (CFD) simulation of the flow field, combustion and emissions of gas turbine engine combustors. Reduced mechanisms lessen computational cost and possess the ability to accurately predict the overall flame structure, including gas temperature and species as CH4, CO and NOx. The S-STEP algorithm which based on computational singular perturbation method (CSP) is performed for reduced the detailed mechanism GRI-3.0. This algorithm required as input: the detailed mechanism, a numerical solution of the problem and the desired number of steps in the reduced mechanism. In this work, we present a 10-Step reduced mechanism obtained through S-STEP algorithm. The rate of each reaction in the reduced mechanism depends on all species, steady-state and non-steady state. The former are calculated from the solution of a system of steady-state algebraic relations with the point relaxation algorithm. Based on premixed code calculations, The numeric results which were obtained for 1 atm ≤ Pressure ≤ 30 atm and 1.4 ≤ ф ≤ 0.6 on the basis of the ten steps global mechanism, were compared with those computed on the basis of the detailed mechanism GRI-3.0. The 10-step reduced mechanism predicts with accuracy the similar results obtained by the full GRI-3.0 mechanism for both NOx and CH4 chemistry.
