"ප්‍රහාරක කෝණය" හි සංශෝධන අතර වෙනස්කම්

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{{delete|this should not be on the [[:si:|Simhala Wikipedia]], it's copied from the [[:en:|English Wikipedia]]}}
[[Image:Angle of attack.svg|thumb|right|300px|ඉහත රූපයේ දැක්වෙන්නේ ගුවන් යානා පියාපතක හරස්කඩකි. කළු පැහැති රේඛා වලින් දක්වා ඇත්තේ සුළඟේ දිශාවයි. α මගින් දක්වා ඇති කෝණය, ප්‍රහාරක කෝණයයි.]]
 
'''ප්‍රහාරක කෝණය''' (<math>\alpha</math>, [[ඇල්ෆා (අක්ෂරය)|ඇල්ෆා]] නම් වූ [[ග්‍රීක හෝඩිය|ග්‍රීක අක්ෂරය]])
යනු [[වායු ගතික විද්‍යාව|වායු ගතික විද්‍යාවේදී]] airfoil's [[chord (aircraft)|chord line]] සහ වායුව ගලායන දිශාව එසේත් නැතිනම් [[ගුවන් යානය|ගුවන් යානයෙහි]] වත්මන් ගමන් මාර්ගය අතර [[කෝණය]] හැඳින්වීම සඳහා භාවිතාවන යෙදුමයි. මෙය ගුවන් යානයේ තටුව '''යොමු වී ඇති දිශාව''' සහ එය '''ගමන් කරන දිශාව''' අතර කෝණය ලෙස සරලව දැක්විය හැක.වඩාත් සරලව ගතහොත් ප්‍රහාරක කෝණයයි යනු ගුවන් යානයේ පියාපත් සුළඟට පහර දෙන කෝණය ලෙසද සැලකිය හැක.
 
The amount of [[lift (force)|lift]] generated by a wing is directly related to the angle of attack, with greater angles generating more lift (and more [[drag (physics)|drag]]). This remains true up to the [[stall (flight)|stall]] point, where lift starts to decrease again because of airflow separation. Planes flying at high angles of attack can suddenly enter a stall if, for example, a strong wind gust changes the direction of the relative wind. Also, to maintain a given amount of lift, the angle of attack must be increased as speed through the air decreases. This is why stalling is an effect that occurs more frequently at low speeds. Nonetheless, a wing (or any other airfoil) can stall at any speed.
 
Using a variety of additional aerodynamic surfaces &mdash; known as high-lift devices &mdash; like [[leading edge extension]]s, [[fighter aircraft]] have increased the potential flyable alpha from about 20° to over 45°, and in some designs, 90° or more. That is, the plane remains flyable when the wing's chord is perpendicular to the direction of motion.
 
Some aircraft are equipped with a built-in flight computer that automatically prevents the plane from lifting its nose any further when the maximum angle of attack is reached, in spite of pilot input. This is called the ''angle of attack limiter'' or ''alpha limiter''. The pilot may disengage the alpha limiter at any time, thus allowing the plane to perform tighter turns (but with considerably higher risk of going into a [[stall (flight)|stall]]). A famous military example of this is [[Pugachev's Cobra]], a maneuver which has only been performed by the [[MiG-29]], the [[Su-27]]/[[Su-33]] and some prototype Western aircraft, although some consider the [[F-15]]/[[F-16]] to be capable if really pushed. Modern airliners which limit the angle of attack by means of computers include the [[Airbus]] 320, 330, 340 and 380 series.
 
==Sailing==
In [[sailing]], the '''angle of attack''' is the angle between a mid-sail and the direction of the wind. The physical principles involved are the same as for aircraft. See [[points of sail]]
 
==See also==
*[[Airfoil]]
*[[Angle of incidence]]
*[[Bernoulli's principle]]
*[[Camber (aerodynamics)|Camber]]
*[[Coefficient of lift]]
*[[Drag equation]]
*[[Lift (force)]]
*[[Zero lift axis]]
 
[[Category:වායු ගතිකවේදය]]
"https://si.wikipedia.org/wiki/ප්‍රහාරක_කෝණය" වෙතින් සම්ප්‍රවේශනය කෙරිණි