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Improving the performance of ducted fans for VTOL applications:A review

Science China(Technological Sciences) 2022年第11期65卷 2521-2541页

作者： QIAN YuPing LUO YiWei HU XuanYang ZENG ZeZhi ZHANG YangJun State Key Laboratory of Automotive Safety and Energy School of Vehicle and MobilityTsinghua UniversityBeijing 10o084China

Ducted fans have been widely used in VTOL aircraft due to the high propulsion efficiency and *** efficiency and stability of ducted fans deteriorate in some flight conditions such as hovering in crosswinds or ground *** is necessary to optimize the ducted fan’s structures or apply flow control methods for better adaptions to the typical *** paper presents a detailed review on the ducted fan technology for VTOL applications,especially the methods for improving its efficiency and *** first simplified the classification categories based on boundary conditions instead of flight conditions,since the new classification method covers more situations and is easier to distinguish flow field *** flow characteristics,thrust properties and the optimal structures under different boundary conditions were summarized and ***,new configurations and flow control methods for increasing the efficiency and stability were *** newly proposed integration design between the ducted fan and the motor was emphasized for increasing the power density of the ducted *** review would be helpful to improve our understanding of the relationship between the structures,flow characteristics and thrust properties of ducted fans under different flight conditions,and inspires scientists to design high-efficiency and high-stability propulsion systems with ducted fans.

关键词： ducted fan VTOL figure ofmerit working stability aerodynamic stability

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A highly-efficient concentrated perovskite solar cell-thermoelectric generator tandem system

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Journal of Energy Chemistry 2021年第8期30卷 730-735,I0015页

作者： Yangying Zhou Yanan Chen Qi Zhang Yu Zhou Meiqian Tai Kunihito Koumoto Hong Lin State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua University100084 BeijingChina Nagoya Industrial Science Research Institute 464-0819 NagoyaJapan Center of Nanotechnology King Abdulaziz University21589 JeddahSaudi Arabia

Concentrated photovoltaic(CPV)has been identified as an effective method to further enhance the efficiency of photovoltaic *** studies on CPV mainly focused on III-V multi-junction ***,Ⅲ-ⅤCPV technology is mainly used in niche applications due to its high ***,we use metal-halide perovskite solar cell(PSC)to demonstrate a concentrated photovoltaic-thermoelectric tandem *** thermoelectric generator(TEG)is utilized to reduce the effect of heat generation under concentrated solar *** tandem system achieved a peak power conversion efficiency(PCE)of 25.0%at a solar concentration of 3 *** efficiency exceeded that of the single PSC by~4.7%.Our work proves that by controlling the heat flow in concentrated PSC-TEG tandem system,the redundant heat produced by upper PSC can be effectively *** tandem structure provides a promising approach to improve the efficiency and stability of PSC under low-concentrated solar irradiation.

关键词： Concentrated PV-TEG tandem system Perovskite solar cell Thermal behavior working stability

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A highly-efficient concentrated perovskite solar cell-thermoelectric generator tandem system

A highly-efficient concentrated perovskite solar cell-thermo...

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第八届新型太阳能材料科学与技术学术研讨会

作者： Yangying Zhou Hong Lin State Key Laboratory of New Ceramics & Fine Processing School of Materials Science and EngineeringTsinghua University

Concentrated photovoltaic(CPV) can exceed the S-Q limit and has been identified as an effective method to further enhance the efficiency of photovoltaic cells. Previous researches on CPV field were mainly focused on III-V multi-junction cells, however, it has not been widely used in civilian fields due to its high cost. Here, we use metal-halide perovskite solar cell(PSC) to demonstrate a concentrated photovoltaic-thermoelectric tandem device. The thermoelectric generator(TEG) is utilized to reduce the effect of heat generation under concentrated solar irradiance. Our tandem system achieved a peak power conversion efficiency(PCE) of 25.0% at the solar concentration of 3 suns, which was higher than the single PSC by ～ 4.7%. Our work proves that by controlling the heat flow in PSC-TEG tandem system, the redundant heat produced by upper PSC can be effectively reused. This tandem structure provides a promising approach to further improve the efficiency of PSCs under low-concentrating solar radiation.

关键词： concentrated PV-TEG tandem system perovskite solar cell thermal behavior working stability

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