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  • 1
    Online Resource
    Online Resource
    Numerical simulation of the aerodynamic performance of a novel micro-aerial vehicle mimicking a locust (2021)
    Berlin : Humboldt-Universität zu Berlin
    Details
    UID:
    b3kat_BV047178400
    Format: 1 Online-Ressource
    Language: English
    DOI: 10.18452/23459
    URN: urn:nbn:de:kobv:11-110-18452/24092-8
    URL: Volltext  (kostenfrei)
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    HU Berlin
  • 2
    Online Resource
    Online Resource
    Low speed aerodynamic characteristics of non-slender delta wing at low angles of attack (2022)
    Berlin : Humboldt-Universität zu Berlin
    Details
    UID:
    b3kat_BV047878248
    Format: 1 Online-Ressource
    Edition: [Zweitveröffentlichung]
    Language: English
    DOI: 10.18452/24501
    URN: urn:nbn:de:kobv:11-110-18452/25169-2
    URL: Volltext  (kostenfrei)
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    HU Berlin
  • 3
    Online Resource
    Online Resource
    Numerical simulation of the aerodynamic performance of a novel micro-aerial vehicle mimicking a locust (2021)
    Berlin : Humboldt-Universität zu Berlin
    Details
    UID:
    edochu_18452_24092
    Format: 1 Online-Ressource (11 Seiten)
    Content: This paper describes the design, micro-fabrication and testing of a novel Micro-Aerial Vehicle (MAV) that mimicking a real locust. Actual parameters of locust insect are used to create a micro-scale MAV that can replace the traditional types that mimicking dragonfly and birds. Based on the obtained results, the novel MAV crucial parameters are its weight and strength to take-off under normal locust performance parameters fashion. Computational Fluid Dynamics (CFD) simulations are carried out at angles of attack of 10°, 20° and 30° and flapping frequencies of 19 Hz, 24 Hz, 30 Hz, 35 Hz and 40 Hz to investigate the aerodynamic performance of this designed MAV and optimize its flapping frequency. The simulation results defined the frequency at which the MAV is capable of hovering and take-off. In addition, the simulation results showed that the MAV is able to utilize some lift enhancement mechanisms that are being actually used by insects. These results enhances the manufacturing process of future MAV’s, especially in the material selection and manufacturing method, and the transmission mechanism for flight.
    Content: Peer Reviewed
    Note: This article was supported by the German Research Foundation (DFG) and the Open Access Publication Fund of Humboldt-Universität zu Berlin.
    In: Amsterdam : Elsevier, 12,3, Seiten 2935-2945
    Language: English
    DOI: 10.18452/23459
    DOI: 10.1016/j.asej.2021.01.022
    URN: urn:nbn:de:kobv:11-110-18452/24092-8
    URL: Volltext  (kostenfrei)
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    HU Berlin
  • 4
    Online Resource
    Online Resource
    Low speed aerodynamic characteristics of non-slender delta wing at low angles of attack (2022)
    Berlin : Humboldt-Universität zu Berlin
    Details
    UID:
    edochu_18452_25169
    Format: 1 Online-Ressource (9 Seiten)
    Content: Low-speed wind tunnel experiments are conducted to study the aerodynamic performance of a half-span delta wing with 45° leading-edge sweep at subsonic flow regime. The experiments are carried out at a Reynolds number of 8.37 × 105, a free-stream Mach number of 0.1 and angles of attack up to 25°, in steps of 5°. The test model was designed with thirty-two pressure taps fixed on its surfaces (sixteen on each side). Multi-tube manometers were connected to these taps using long tubes to enable recording the pressure readings. Surface pressure distributions and aerodynamic characteristics were calculated at different span-wise locations along the non-dimensional chord-wise distance. Results exhibited that most lift on the studied wing is generated in the region close to the leading edge for all the studied incidence angles. Additional lift is created in the region close to the root chord rather than the tip chord, whereas drag forces increases from tip to root. This can be attributed to the formation of trailing edge vortexes due to the flow separation at the wing leading edge that produces more drag, hence suppressing lift. The study showed also that angle of attack increases the drag coefficient from tip to root, especially at high angle of attack, indicating unfavourable behaviour for manoeuvring. Moreover, the angle of attack increased the pitching moment coefficient up to 10° before it drops sharply until it reaches the tip of the wing model.
    Content: Peer Reviewed
    Note: This article was supported by the German Research Foundation (DFG) and the Open Access Publication Fund of Humboldt-Universität zu Berlin.
    In: Amsterdam u.a. : Elsevier, 61,12, Seiten 9427-9435
    Language: English
    DOI: 10.18452/24501
    DOI: 10.1016/j.aej.2022.03.003
    URN: urn:nbn:de:kobv:11-110-18452/25169-2
    URL: Volltext  (kostenfrei)
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    HU Berlin
  • 5
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    Online Resource
    Impact of Air Conditioning Systems on the Outdoor Thermal Environment during Summer in Berlin, Germany (2020)
    Berlin : Humboldt-Universität zu Berlin
    Details
    UID:
    edochu_18452_22317
    Format: 1 Online-Ressource (21 Seiten)
    Content: This study investigates the effect of anthropogenic heat emissions from air conditioning systems (AC) on air temperature and AC energy consumption in Berlin, Germany. We conduct simulations applying the model system CCLM/DCEP-BEM, a coupled system of the mesoscale climate model COSMO-CLM (CCLM) and the urban Double Canyon Effect Parameterization scheme with a building energy model (DCEP-BEM), for a summer period of 2018. The DCEP-BEM model is designed to explicitly compute the anthropogenic heat emissions from urban buildings and the heat flux transfer between buildings and the atmosphere. We investigate two locations where the AC outdoor units are installed: either on the wall of a building (VerAC) or on the rooftop of a building (HorAC). AC waste heat emissions considerably increase the near-surface air temperature. Compared to a reference scenario without AC systems, the VerAC scenario with a target indoor temperature of 22 °C results in a temperature increase of up to 0.6 K . The increase is more pronounced during the night and for urban areas. The effect of HorAC on air temperature is overall smaller than in VerAC. With the target indoor temperature of 22 °C , an urban site’s daily average AC energy consumption per floor area of a room is 9.1 W m2 , which is 35% more than that of a suburban site. This energy-saving results from the urban heat island effect and different building parameters between both sits. The maximum AC energy consumption occurs in the afternoon. When the target indoor temperature rises, the AC energy consumption decreases at a rate of about 16% per 2 K change in indoor temperature. The nighttime near-surface temperature in VerAC scenarios shows a declining trend ( 0.06 K per 2 K change) with increasing target indoor temperature. This feature is not obvious in HorAC scenarios which further confirms that HorAC has a smaller impact on near-surface air temperature.
    Content: Peer Reviewed
    In: Basel : MDPI, 17,13
    Language: English
    DOI: 10.18452/21601
    DOI: 10.3390/ijerph17134645
    URN: urn:nbn:de:kobv:11-110-18452/22317-4
    URL: Volltext  (kostenfrei)
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    HU Berlin
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