Two Delayed-Detached Eddy Simulation(DDES) models, and a Large-Eddy Simulation(LES) model are used to investigate the turbulent flows and mixed convection between a hot plate and a cold plate via the software FLUENT. ...Two Delayed-Detached Eddy Simulation(DDES) models, and a Large-Eddy Simulation(LES) model are used to investigate the turbulent flows and mixed convection between a hot plate and a cold plate via the software FLUENT. The two DDES models include Production-limited DDES(PL-DDES) and Improved DDES(IDDES) models.The Wall-Adapting Local Eddy-Viscosity(WALE) model is the used LES model. The numerical computations are performed at Reynolds number Reb= 4494 and different Richardson numbers Ri = 0.025, 0.048, 0.1. The comparing data is from the Direct Numerical Simulation(DNS) at Reb= 4494 and Ri = 0.048. The comparison reveals that the two DDES models have better performance in predicting time-averaged parameters than the WALE model in the aiding flow. The best predicted time-averaged results are obtained by the PL-DDES model in the opposing flow. Furthermore, the results of different Ri obtained by the PL-DDES model agree well with the DNS data.展开更多
按照基于配煤模型的配比原则,开发出应用于火电厂配煤控制的自动化系统。阐述了系统的构成、配煤数学模型、配比的确定。系统输煤程控的人机界面用InTouch组态软件编制,Matlab完成配比计算,动态数据交换DDE(Dynamic Data Exchange)实现...按照基于配煤模型的配比原则,开发出应用于火电厂配煤控制的自动化系统。阐述了系统的构成、配煤数学模型、配比的确定。系统输煤程控的人机界面用InTouch组态软件编制,Matlab完成配比计算,动态数据交换DDE(Dynamic Data Exchange)实现数据交换连接。最后,介绍了运用变频技术实现闭环调节可优化配煤的策略,该技术对提高火电厂的经济效益有实际价值。展开更多
基金Supported by the Program of International Science and Technology Cooperation of China(2016YFE0118100)Dongguan Innovative Research team Program(2014607119).
文摘Two Delayed-Detached Eddy Simulation(DDES) models, and a Large-Eddy Simulation(LES) model are used to investigate the turbulent flows and mixed convection between a hot plate and a cold plate via the software FLUENT. The two DDES models include Production-limited DDES(PL-DDES) and Improved DDES(IDDES) models.The Wall-Adapting Local Eddy-Viscosity(WALE) model is the used LES model. The numerical computations are performed at Reynolds number Reb= 4494 and different Richardson numbers Ri = 0.025, 0.048, 0.1. The comparing data is from the Direct Numerical Simulation(DNS) at Reb= 4494 and Ri = 0.048. The comparison reveals that the two DDES models have better performance in predicting time-averaged parameters than the WALE model in the aiding flow. The best predicted time-averaged results are obtained by the PL-DDES model in the opposing flow. Furthermore, the results of different Ri obtained by the PL-DDES model agree well with the DNS data.
文摘按照基于配煤模型的配比原则,开发出应用于火电厂配煤控制的自动化系统。阐述了系统的构成、配煤数学模型、配比的确定。系统输煤程控的人机界面用InTouch组态软件编制,Matlab完成配比计算,动态数据交换DDE(Dynamic Data Exchange)实现数据交换连接。最后,介绍了运用变频技术实现闭环调节可优化配煤的策略,该技术对提高火电厂的经济效益有实际价值。
