This study provides an overview of Building-Integrated Wind Turbines,focusing on cement silos as wind concentrators,along with determining the amount of power that could be connected without regard to wind direction.T...This study provides an overview of Building-Integrated Wind Turbines,focusing on cement silos as wind concentrators,along with determining the amount of power that could be connected without regard to wind direction.The motivation of this research is the intermittency issue of wind stream in an open environment and non-exploration of wind turbines between cement silos.Building-Augmented Wind Turbines provide 717 W of aerodynamic power at 16 m/s,whereas Standalone Wind Turbines produce 562 W.This is due to the wind speed acceleration between buildings,which causes a concentration effect.Meanwhile,using the simulation software ANSYS,the turbine geometry is developed utilising a Computational Fluid Dynamics evaluation.展开更多
Power augmented ram （PAR）engine is a popular equipment to reduce the requirement of power for takeoff and improve aerodynamic performance. To provide detailed insight into the aerodynamic characteristics of wing-in-...Power augmented ram （PAR）engine is a popular equipment to reduce the requirement of power for takeoff and improve aerodynamic performance. To provide detailed insight into the aerodynamic characteristics of wing-in-ground effect （WIG）craft with PAR engine, numerical simulations are carried out on WIG craft models in cruise. Simplified engine models are applied to the simulations. Two cruise modes for PAR engine are considered. The aerodynamic characteristics of the WIG craft and other features are studied. Comparisons with WIG craft model without PAR show that shutoff of PAR engine results in an increase in drag and less change in lift. Accordingly for the work of PAR engine, the air flow blown from the engine accelerates the flow around the upper surface and a high-speed attached flow near the trailing edge is recorded. With the schemed PAR flow, more suction force is realized and the flow features over the wing vary noticeably. It is also shown that the Coanda effect,provided with an attached flow, introduces an appropriate and practical flow mode for WIG craft with PAR engine in cruise. The results refresh our understanding on aerodynamic characteristics of WIG craft.展开更多
文摘This study provides an overview of Building-Integrated Wind Turbines,focusing on cement silos as wind concentrators,along with determining the amount of power that could be connected without regard to wind direction.The motivation of this research is the intermittency issue of wind stream in an open environment and non-exploration of wind turbines between cement silos.Building-Augmented Wind Turbines provide 717 W of aerodynamic power at 16 m/s,whereas Standalone Wind Turbines produce 562 W.This is due to the wind speed acceleration between buildings,which causes a concentration effect.Meanwhile,using the simulation software ANSYS,the turbine geometry is developed utilising a Computational Fluid Dynamics evaluation.
基金Program for Changjiang Scholars and Innovative Research Team in UniversityDoctoral Program Foundation of Institutions of Higher Education of China (20060247028)
文摘Power augmented ram （PAR）engine is a popular equipment to reduce the requirement of power for takeoff and improve aerodynamic performance. To provide detailed insight into the aerodynamic characteristics of wing-in-ground effect （WIG）craft with PAR engine, numerical simulations are carried out on WIG craft models in cruise. Simplified engine models are applied to the simulations. Two cruise modes for PAR engine are considered. The aerodynamic characteristics of the WIG craft and other features are studied. Comparisons with WIG craft model without PAR show that shutoff of PAR engine results in an increase in drag and less change in lift. Accordingly for the work of PAR engine, the air flow blown from the engine accelerates the flow around the upper surface and a high-speed attached flow near the trailing edge is recorded. With the schemed PAR flow, more suction force is realized and the flow features over the wing vary noticeably. It is also shown that the Coanda effect,provided with an attached flow, introduces an appropriate and practical flow mode for WIG craft with PAR engine in cruise. The results refresh our understanding on aerodynamic characteristics of WIG craft.
