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Optimization design study of low-reynolds-number high-lift airfoils for the high-efficiency propeller of low-dynamic vehicles in stratosphere

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science China(Technological sciences) 2010年第10期53卷 2792-2807页

作者： MA rong1, ZHONG BoWen2 & LIU PeiQing1 1 Key Laboratory of Fluid Mechanics, Ministry of Education, Institute of Fluid Mechanics, school of Aeronautical science and engineering, Beijing university of Aeronautics and Astronautics, Beijing 100191, China 2.dep.r.ment of aerospace science, school of engineering, cranfield university, mk43 0al, united kingdom 1. Key Laboratory of Fluid Mechanics Ministry of Education Institute of Fluid Mechanics School of Aeronautical Science and Engineering Beijing University of Aeronautics and Astronautics Beijing 100191 China2. Department of Aerospace Science School of Engineering Cranfield University MK43 0AL Cranfield UK

Aerodynamic performance of low-reynolds-number high-lift airfoil makes a great impact on designing a high-efficiency propeller for low-dynamic vehicles in stratosphere. At high altitude,low-reynolds-number airfoils are supposed to have high lift-drag ratio or high endurance factor at cruising attack angle along with good stall characteristics. To design such a high-performance low-reynolds-number high-lift airfoil,the paper established a hierarchical multi-objective optimization platform by combing direct search optimization algorithm EXTrEM and airfoil flow field solver XFOIL to automatically and quickly calculate aerodynamic performance function of airfoil by computer. It provides an effective solution to multi-point design problem of low-speed low-reynolds-number airfoil. It can be seen from the results of three typical optimization examples,the new airfoil E387_OPT2,FX63-137_OPT2 and S1223_OPT2 based on hot low-reynolds-number high-lift airfoils (Eppler 387 airfoil,Wortmann FX63-137 airfoil and S1223 airfoil) can meet the optimization design requirements and have very good aerodynamic characteristics in both design state and non-design state. Thus,the applicability and effectiveness of hierarchical multi-objective optimization platform are verified.

关键词： multi-objective optimization low reynolds number airfoil EXTrEM hierarchical multi-objective optimization

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The Soft X-ray Imager(SXI)on the SMILE Mission

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Earth and Planetary Physics 2024年第1期8卷 5-14页

作者： S.Sembay A.L.alme D.Agnolon T.Arnold A.Beardmore A.Belén Balado Margeli C.Bicknell C.Bouldin G.Branduardi-raymont T.Crawford J.P.Breuer T.Buggey G.Butcher r.Canchal J.A.Carter A.Cheney Y.Collado-Vega H.Connor T.Crawford N.Eaton C.Feldman C.Forsyth T.Frantzen G.Galgóczi J.Garcia G.Y.Genov C.Gordillo H-P.Gröbelbauer M.Guedel Y.Guo M.Hailey D.Hall r.Hampson J.Hasiba O.Hetherington A.Holland S-Y.Hsieh M.W.J.Hubbard H.Jeszenszky M.Jones T.Kennedy K.Koch-Mehrin S.Kögl S.Krucker K.D.Kuntz C.Lakin G.Laky O.Lylund A.Martindale J.Miguel Mas Hesse r.Nakamura K.Oksavik N.Østgaard H.Ottacher r.Ottensamer C.Pagani S.Parsons P.Patel J.Pearson G.Peikert F.S.Porter T.Pouliantis B.H.Qureshi W.raab G.randal A.M.read N.M.M.roque M.E.rostad C.runciman S.Sachdev A.Samsonov M.Soman D.Sibeck S.Smit J.Søndergaard r.Speight S.Stavland M.Steller Tianran Sun J.Thornhill W.Thomas K.Ullaland B.Walsh D.Walton C.Wang S.Yang school of Physics and Astronomy University of LeicesterLeicesterLE17RHUK Space Park Leicester University of LeicesterLeicesterLE17RHUK Mullard Space science Laboratory University College LondonDorkingRH56NTUK Centre for Electronic Imaging Open UniversityMilton KeynesMK76 AAUK Birkeland Centre for Space science Department of Physics and TechnologyUniv.of BergenN-5007 BergenNorway university of Vienna A-1010 ViennaAustria Space research Institute Austrian Academy of SciencesA-8042 GrazAustria National Institute of aerospace Technology MadridSpain ESTEC European Space Agency2201 AZ NoordwijkNetherlands State Key Laboratory of Space Weather National Space Science CentreBeijing 100190China university of Applied sciences and Arts Northwestern Switzerland CH-5210 WindischSwitzerland Koegl Space GmbH CH-8157 DielsdorfSwitzerland Space Acoustics GmbH CH-8157 DielsdorfSwitzerland Zurich university of Applied sciences 8400 WinterhurSwitzerland Genov Solutions N-5172 LoddefjordNorway STM engineering N-5165 LaksevagNorway John Hopkins university Applied Physics Laboratory MD 20723USA NASA/Goddard Space Flight Centre MD 20771USA Center for Space Physics Boston UniversityBostonMA 02215USA department of Theoretical Physics and Astrophysics Masaryk University60177 BrnoCzech Republic Institute of Physics E¨otvo¨s Lor´and University1053 BudapestHungary aerospace Information research Institute Chinese Academy of SciencesBeijing 100045China Centro de Astrobiologia(CAB) CSIC-INTAMadridSpain

The Soft X-ray Imager(SXI)is part of the scientific payload of the Solar wind Magnetosphere Ionosphere Link Explorer(SMILE)*** is a joint science mission between the European Space Agency(ESA)and the Chinese Academy of sciences(CAS)and is due for launch in *** is a compact X-ray telescope with a wide field-of-view(FOV)capable of encompassing large portions of Earth’s magnetosphere from the vantage point of the SMILE *** is sensitive to the soft X-rays produced by the Solar Wind Charge eXchange(SWCX)process produced when heavy ions of solar wind origin interact with neutral particles in Earth’s *** provides a mechanism for boundary detection within the magnetosphere,such as the position of Earth’s magnetopause,because the solar wind heavy ions have a very low density in regions of closed magnetic field *** sensitivity of the SXI is such that it can potentially track movements of the magnetopause on timescales of a few minutes and the orbit of SMILE will enable such movements to be tracked for segments lasting many *** is led by the university of Leicester in the united kingdom(UK)with collaborating organisations on hardware,software and science support within the UK,Europe,China and the united States.

关键词： Soft X-ray Imaging micropore optics large area CCD

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Surface defects incorporated diamond machining of silicon

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International Journal of Extreme Manufacturing 2020年第4期2卷 57-73页

作者： Neha Khatri Borad M Barkachary B Muneeswaran rajab al-Sayegh Xichun Luo Saurav Goel Optical Devices&System Division CSIR-CSIOSector 30Chandigarh160030India department of Mechanical engineering Jorhat Institute of Science&TechnologyJorhat Assam 785010India Fenner Conveyor Belting Pvt.Ltd. Dindigul Road NagriMaduraiVadipatti Taluk 625221India College of engineering Northern Border UniversityArar 91431Saudi Arabia Centre for Precision Manufacturing DMEMUniversity of StrathclydeGlasgow G11XQUnited Kingdom school of engineering London South Bank University103 Borough RoadLondon SE10AAUnited Kingdom EPSrC Centre for Doctoral Training in Ultra-Precision engineering University of Cambridge and Cranfield UniversityCranfieldUnited Kingdom school of aerospace Transport and ManufacturingCranfield UniversityBedfordshire MK430ALUnited Kingdom department of Mechanical engineering Shiv Nadar UniversityGautam Budh Nagar 201314India

This paper reports the performance enhancement benefits in diamond turning of the silicon wafer by incorporation of the surface defect machining(SDM)*** hybrid micromachining methods usually require additional hardware to leverage the added advantage of hybrid technologies such as laser heating,cryogenic cooling,electric pulse or ultrasonic elliptical *** SDM method tested in this paper does not require any such additional baggage and is easy to implement in a sequential micro-machining *** paper made use of raman spectroscopy data,average surface roughness data and imaging data of the cutting chips of silicon for drawing a comparison between conventional single-point diamond turning(SPDT)and SDM while incorporating surface defects in the(i)circumferential and(ii)radial *** 3D finite element analysis(FEA)was performed to analyse the cutting forces and the evolution of residual stress on the machined *** was found that the surface defects generated in the circumferential direction with an interspacing of 1 mm revealed the lowest average surface roughness(ra)of 3.2 nm as opposed to 8 nm ra obtained through conventional SPDT using the same cutting *** observation of the raman spectroscopy performed on the cutting chips showed remnants of phase transformation during the micromachining process in all *** was used to extract quantifiable information about the residual stress as well as the sub-surface integrity and it was discovered that the grooves made in the circumferential direction gave the best machining *** information being reported here is expected to provide an avalanche of opportunities in the SPDT area for low-cost machining solution for a range of other nominal hard,brittle materials such as SiC,ZnSe and GaAs as well as hard steels.

关键词： surface defect machining silicon finite element analysis surface roughness

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