Lower surface of the aerofoil profile

14:02 Sep 22, 2008
English language (monolingual) [PRO]
Tech/Engineering - Energy / Power Generation / How can I find this definition?
English term or phrase: Lower surface of the aerofoil profile
Wind turbine.I need scientific definition for a glossary and a context
Iolanda Lanzafame
Italy
Local time: 14:03


SUMMARY OF ALL EXPLANATIONS PROVIDED
5 +1underside
Gary D
4aerofoil profile
Robin Levey
4The aerofoil (airfoil) profile is the cross section of the blade or wing...
Jack Doughty


Discussion entries: 4





  

Answers


38 mins   confidence: Answerer confidence 4/5Answerer confidence 4/5
lower surface of the aerofoil profile
The aerofoil (airfoil) profile is the cross section of the blade or wing...


Explanation:
Aerofoil is UK English, airfoil is more common in US English.
Surely you don't need a definition of "lower surface"?
The aerofoil profile is normally set at a certain "angle of attack" to the airflow, so that the pressure of the airflow is exerted on the lower surface of the aerofoil process, creating the main force which drives the rotor or propeller. The component of this force perpendicular to the airflow is called lift. More lift is created as the air flows over the convex shape of the upper surface of the aerofoil, since because of this shape, the air flow becomes faster but its pressure is reduced.
Jack Doughty, aircraft engine fitter in RAF, 1950-52.

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Note added at 39 mins (2008-09-22 14:41:36 GMT)
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Line 4, "aerofoil profile", not "aerofoil process".

Jack Doughty
United Kingdom
Local time: 13:03
Works in field
Native speaker of: English
PRO pts in category: 18

Peer comments on this answer (and responses from the answerer)
neutral  Robin Levey: It is not clear if you are referring to the forces in a wing, a propellor or a generator rotor.//So why write: '... creating the main force which drives the rotor or propeller.'?
22 mins
  -> I was thinking of an aircraft wing. How do the dynamics differ?
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1 hr   confidence: Answerer confidence 4/5Answerer confidence 4/5
lower surface of the aerofoil profile
aerofoil profile


Explanation:
aerofoil profile: A complex curve representing the cross-section of a panel (aircraft wing, propellor, wind-turbine rotor, etc.) and which serves to translate the energy of air moving across the profile into a force perpendicular to the direction of air flow (case of an aircraft wing or propellor); or to translate the energy of air impinging in a direction perpendicular to the surface of profile into a lateral force (which is converted to a rotational force in the case of a wind turbine rotor).

The profile is characterized by having a convex curve on one side and a concave curve on the other. These are conventionally the 'upper' and 'lower' surfaces of the profile, respectively, as determined from the configuration of an aircraft wing; these designations are applied in the same way in a vertical structure such as a propellor or wind-generator rotor, in which the 'upper' surface is to windward and the 'lower' surface is to leeward.

Robin Levey
Chile
Local time: 09:03
Specializes in field
Native speaker of: Native in EnglishEnglish
PRO pts in category: 4
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17 hrs   confidence: Answerer confidence 5/5 peer agreement (net): +1
lower surface of the aerofoil profile
underside


Explanation:
Underside and the topside, never walk on the topside of a wing.
the underside curvature of a wing is just called he underside.

http://www.foxnews.com/story/0,2933,77473,00.html

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Note added at 17 hrs (2008-09-23 07:18:42 GMT)
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On a propeller it is the front and the back, except on a Helicopter it goes back to topside and underside

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Note added at 17 hrs (2008-09-23 07:21:43 GMT)
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http://www.thunder-and-lightnings.co.uk/vulcan/wings.html

funny also they also call a butterfly wings underside and topside.

Gary D
Local time: 22:03
Native speaker of: Native in EnglishEnglish
PRO pts in category: 4

Peer comments on this answer (and responses from the answerer)
agree  Bashiqa: Not advisable towalk on either the underside or tposide of a butterfly
3 hrs
  -> that cracked me up, thank you for the laugh
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