2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Ntawm lub hom phiaj dav dav aerofoil qhov loj tshaj plaws ntawm Lift tshwm sim rau saum npoo (qhov twg nws nkhaus tshaj plaws). Feem ntau hais txog 80% ntawm nqa tau tshwm sim ntawm lub tis saum npoo. Nqa yog proportional rau square ntawm airspeed.
Yuav ua li cas tis ua tus nqa tshaj?
Airfoil Peb tsim qhov nqa feem ntau vim yog oval arc duab. Kev nqa yog tshwm sim los ntawm kev txav ceev ntawm huab cua nyob rau sab saum toj ntawm lub airfoil.
Qhov twg airfoil tsim ntau dua?
Kev nce huab cua nrawm yuav ua rau kom nce. Nce lub camber yuav ua rau kom lub nqa. A symmetric airfoil, lossis txawm tias lub phaj tiaj tus ntawm lub kaum sab xis ntawm kev tawm tsam, yuav tsim nqa. Nqa zoo li muaj zog heev ntawm airfoil camber.
Yuav ua li cas nqa tawm los ntawm aerofoil?
Airfoil generates nqa los ntawm exerting downward force on the air as it flows. Raws li Newton txoj cai lij choj thib peb, huab cua yuav tsum ua kom muaj kev sib npaug thiab sib npaug (nce) quab yuam ntawm lub airfoil, uas yog nqa. Lub airflow hloov kev taw qhia thaum nws hla lub airfoil thiab ua raws txoj kev uas yog nkhaus downward.
Dab tsi ua rau muaj feem cuam tshuam ntau tshaj plaws ntawm qhov nqa nqa los ntawm airfoil?
Yam khoom: Nyob rau sab saum toj ntawm daim duab, dav hlau tis geometry muaj qhov cuam tshuam loj ntawm qhov nqa tau tsim. Lub airfoil puab thiab tis loj yuav cuam tshuam rau ob leegtus nqi nqa. Qhov piv ntawm tis ncua mus rau thaj tsam tis kuj cuam tshuam rau tus nqi nqa los ntawm tis.
Pom zoo:
Lub nkoj loj tshaj plaws uas tuaj yeem nqa tau yog dab tsi?
lub nkoj loj tshaj plaws uas tuaj yeem thauj tau yooj yim yog a Hobie 33. Tab sis loj yog tsis meej; Hobie 33 yog lub nkoj nqaim nqaim uas tau sau tseg rau nws qhov kev ua tau zoo tab sis tsis yog nws qhov kev nplij siab liveaboard. Lwm cov nkoj loj thauj mus los yog Seaward 26RK Nor'Sea 27, Macgregor 26M, thiab Corsair F-28 Trimaran.
Qhov twg yog qhov chaw sab hnub tuaj tshaj plaws ntawm thaj av loj hauv tebchaws Africa?
Africa (mainland) Northernmost point - Ras ben Sakka (Ra's al Abyad) (Cape Blanc), Tunisia. Southernmost point - Cape Agulhas, South Africa. Westernmost point - Pointe des Almadies, Cap Vert Peninsula, Ngor, Dakar, Senegal (17° 33'22"
Puas aerofoil tsim nqa?
Cov duab ntawm tis, hu ua airfoil, yog qhov tseem ceeb ntawm no. … Qhov nkhaus thiab lub kaum sab xis ntawm lub tis nce cov huab cua uas ntws hauv qab tis, uas yog txav mus rau hauv qab thiab thawb lub dav hlau nce, tsim tsa. Qhov airfoil tsim nqa?
Qhov twg yog qhov txo qis hauv stratospheric ozone qhov loj tshaj?
Qhov kev txo qis tshaj plaws hauv ozone tau tshwm sim hauv qhov siab latitudes (mus rau tus ncej), thiab qhov tsawg tshaj plaws tau tshwm sim nyob rau hauv qis latitudes (tropics). Tsis tas li ntawd, kev ntsuas atmospheric qhia tias depletion ntawm ozone txheej tau nce tus nqi ntawm UV hluav taws xob mus txog lub ntiaj teb nto.
Qhov twg yog lub qhov dej loj tshaj plaws ntawm lub hli?
Sab Qab Teb Ncej–Aitken phiab (SPA Basin, /ˈeɪtkɪn/) yog ib qho kev cuam tshuam loj heev rau sab hnub poob ntawm lub hli. Ntawm kwv yees li 2, 500 km (1, 600 mi) hauv txoj kab uas hla thiab nruab nrab ntawm 6.2 thiab 8.2 km (3.9–5.1 mi) tob, nws yog ib qho loj tshaj plaws paub txog kev cuam tshuam craters hauv Hnub Ci System.
