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.
