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公开(公告)号：US11953405B2
公开(公告)日：2024-04-09
申请号：US17606690
申请日：2020-07-02
申请人： ZHEJIANG UNIVERSITY
发明人： Yao Zheng , Zhixian Ye , Jianfeng Zou , Yang Zhang , Yiyang Jiang , Zenan Tian , Shaochang Mo
CPC分类号： G01M9/04 , F04D19/002 , F04D27/004
摘要： A tracer particle spreading device for a boundary layer flow visualization experiment based on a flat plate includes a tracer particle generator, a smoke storage box, and a wall-surface particle distribution box. Fume and oil are pressurized by a micro pump and flows into a heating pipe to be heated and vaporized, and then is ejected from a nozzle to form tracer particles. The tracer particles enter the smoke storage box via a smoke guiding tube. An axial flow fan is mounted on a wall surface of the smoke storage box. The tracer particles enter a cavity of the wall-surface particle distribution box via the smoke guiding tube, and the tracer particles are rectified by a rectifying plate and ejected from a spreading slit. An outlet of the spreading slit is at an angle of 15° with respect to an experiment flat plate.
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公开(公告)号：US11235668B1
公开(公告)日：2022-02-01
申请号：US17367913
申请日：2021-07-06
申请人： Zhejiang University
发明人： Yao Zheng , Junyin Chen , Changping Du , Guanghua Song , Rui Yang , Zhixian Ye , Zekun Zhang
摘要： The present disclosure provides an efficient control system and method for a brushless motor with a wide working range, which are applied to an aerospace vehicle energy system. The system of the present disclosure includes a power supplying module, a first DC-DC circuit, a battery pack, a second DC-DC circuit, an anti-reverse-connection circuit, an electronic speed control (ESC), a brushless direct current motor (BLDC), an airborne controller and a communication link. Electric energy from the power supplying module is configured to charge the battery pack via the first DC-DC circuit, and electric energy of the battery pack sequentially flows through the second DC-DC circuit and the anti-reverse-connection circuit to energize the ESC, wherein output voltage of the second DC-DC circuit and throttle signal input of the ESC are controlled in real time by the airborne controller according to a power demand of an aircraft.
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公开(公告)号：US11318847B2
公开(公告)日：2022-05-03
申请号：US17347226
申请日：2021-06-14
申请人： Zhejiang University
发明人： Yao Zheng , Junyin Chen , Changping Du , Guanghua Song , Rui Yang , Zhixian Ye , Zekun Zhang
摘要： The present disclosure discloses an energy management system suitable for a solar-powered unmanned aerial vehicle and a control method thereof, which are used for an aerospace vehicle energy system. The system comprises a photovoltaic module, an MPPT controller, a first DC-DC circuit, a battery pack, a first anti-reverse circuit, a second DC-DC circuit, a second anti-reverse circuit, an ESC, a BLDC, an on-board controller, a communication link and a voltage stabilizing module. During cruising, the battery pack directly supplies power to the ESC through the first anti-reverse circuit; when high-power power output is needed, the battery pack supplies power to the ESC through the second DC-DC circuit and the second anti-reverse circuit in sequence, wherein the output voltage of the second DC-DC circuit and the accelerator signal input of the ESC are controlled by the on-board controller.
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公开(公告)号：US20220032786A1
公开(公告)日：2022-02-03
申请号：US17367913
申请日：2021-07-06
申请人： Zhejiang University
发明人： Yao Zheng , Junyin Chen , Changping Du , Guanghua Song , Rui Yang , Zhixian Ye , Zekun Zhang
摘要： The present disclosure provides an efficient control system and method for a brushless motor with a wide working range, which are applied to an aerospace vehicle energy system. The system of the present disclosure includes a power supplying module, a first DC-DC circuit, a battery pack, a second DC-DC circuit, an anti-reverse-connection circuit, an electronic speed control (ESC), a brushless direct current motor (BLDC), an airborne controller and a communication link. Electric energy from the power supplying module is configured to charge the battery pack via the first DC-DC circuit, and electric energy of the battery pack sequentially flows through the second DC-DC circuit and the anti-reverse-connection circuit to energize the ESC, wherein output voltage of the second DC-DC circuit and throttle signal input of the ESC are controlled in real time by the airborne controller according to a power demand of an aircraft.
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公开(公告)号：US20220315806A1
公开(公告)日：2022-10-06
申请号：US17633174
申请日：2020-08-18
申请人： Zhejiang University
发明人： Yao Zheng , Zhixian Ye , Jianfeng Zou , Yang Zhang , Yiyang Jiang , Zenan Tian , Shaochang Mo
摘要： The disclosure provides a micro-groove drag reduction flexible film and a preparation method thereof. The micro-groove film has a triangular groove structure on the upper surface along the direction of an air flow, and an adhesive layer on the lower surface for quick adhesion to an aircraft surface. After the surface of the aircraft is covered with a micro-groove film, it could limit the spanwise movement of the bottom air at the boundary layer of the aircraft surface, improve the flow field characteristics of the aircraft near the wall, and effectively reduce the frictional resistance of the wall. The micro-groove flexible film is prepared by a roller hot pressing method. The triangular groove structure is processed on the surface of the mold roller of the double roller hot press. After pretreatment of the thermoplastic polyurethane (TPU) polymer film, a micro-groove structure is hot-pressed on the surface of the TPU film.
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公开(公告)号：US20220214245A1
公开(公告)日：2022-07-07
申请号：US17606690
申请日：2020-07-02
申请人： ZHEJIANG UNIVERSITY
发明人： Yao Zheng , Zhixian Ye , Jianfeng Zou , Yang Zhang , Yiyang Jiang , Zenan Tian , Shaochang Mo
摘要： A tracer particle spreading device for a boundary layer flow visualization experiment based on a flat plate includes a tracer particle generator, a smoke storage box, and a wall-surface particle distribution box. Fume and oil are pressurized by a micro pump and flows into a heating pipe to be heated and vaporized, and then is ejected from a nozzle to form tracer particles. The tracer particles enter the smoke storage box via a smoke guiding tube. An axial flow fan is mounted on a wall surface of the smoke storage box. The tracer particles enter a cavity of the wall-surface particle distribution box via the smoke guiding tube, and the tracer particles are rectified by a rectifying plate and ejected from a spreading slit. An outlet of the spreading slit is at an angle of 15° with respect to an experiment flat plate.
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