Advance ratio (original) (raw)
In aeronautics and marine hydrodynamics, the advance ratio is the ratio of the freestream fluid speed to the propeller, rotor, or cyclorotor tip speed. When a propeller-driven vehicle is moving at high speed relative to the fluid, or the propeller is rotating slowly, the advance ratio of its propeller(s) is a high number; and when it is moving at low speed, or the propeller is rotating at high speed, the advance ratio is a low number. The advance ratio is a useful non-dimensional velocity in helicopter and propeller theory, since propellers and rotors will experience the same angle of attack on every blade airfoil section at the same advance ratio regardless of actual forward speed. It is the inverse of the tip speed ratio used for wind turbines.
| Property | Value |
|---|---|
| dbo:abstract | In aeronautics and marine hydrodynamics, the advance ratio is the ratio of the freestream fluid speed to the propeller, rotor, or cyclorotor tip speed. When a propeller-driven vehicle is moving at high speed relative to the fluid, or the propeller is rotating slowly, the advance ratio of its propeller(s) is a high number; and when it is moving at low speed, or the propeller is rotating at high speed, the advance ratio is a low number. The advance ratio is a useful non-dimensional velocity in helicopter and propeller theory, since propellers and rotors will experience the same angle of attack on every blade airfoil section at the same advance ratio regardless of actual forward speed. It is the inverse of the tip speed ratio used for wind turbines. (en) |
| dbo:thumbnail | wiki-commons:Special:FilePath/Aircraft_propeller_diameter.svg?width=300 |
| dbo:wikiPageExternalLink | http://www.allstar.fiu.edu/aero/BA-Background.htm https://web.mit.edu/16.unified/www/FALL/thermodynamics/notes/node86.html |
| dbo:wikiPageID | 26902602 (xsd:integer) |
| dbo:wikiPageLength | 6331 (xsd:nonNegativeInteger) |
| dbo:wikiPageRevisionID | 1039985669 (xsd:integer) |
| dbo:wikiPageWikiLink | dbr:Denominator dbr:Cyclorotor dbr:True_airspeed dbr:Torque dbr:Helicopter_rotor dbr:Airfoil dbr:Angle_of_attack dbr:Propeller dbc:Aerospace_engineering dbr:Aeronautics dbr:Thrust dbr:Axial_fan_design dbr:Slowed_rotor dbr:Retreating_blade_stall dbr:Aircraft_propeller dbr:Tip_speed_ratio dbr:File:Aircraft_propeller_diameter.svg |
| dbp:wikiPageUsesTemplate | dbt:Confusing dbt:Expand_section dbt:Reflist dbt:Short_description |
| dct:subject | dbc:Aerospace_engineering |
| gold:hypernym | dbr:Ratio |
| rdfs:comment | In aeronautics and marine hydrodynamics, the advance ratio is the ratio of the freestream fluid speed to the propeller, rotor, or cyclorotor tip speed. When a propeller-driven vehicle is moving at high speed relative to the fluid, or the propeller is rotating slowly, the advance ratio of its propeller(s) is a high number; and when it is moving at low speed, or the propeller is rotating at high speed, the advance ratio is a low number. The advance ratio is a useful non-dimensional velocity in helicopter and propeller theory, since propellers and rotors will experience the same angle of attack on every blade airfoil section at the same advance ratio regardless of actual forward speed. It is the inverse of the tip speed ratio used for wind turbines. (en) |
| rdfs:label | Advance ratio (en) |
| owl:sameAs | freebase:Advance ratio wikidata:Advance ratio https://global.dbpedia.org/id/4Lvw6 |
| prov:wasDerivedFrom | wikipedia-en:Advance_ratio?oldid=1039985669&ns=0 |
| foaf:depiction | wiki-commons:Special:FilePath/Aircraft_propeller_diameter.svg |
| foaf:isPrimaryTopicOf | wikipedia-en:Advance_ratio |
| is dbo:wikiPageRedirects of | dbr:Diameter_ratio |
| is dbo:wikiPageWikiLink of | dbr:Annular_lift_fan_aircraft dbr:Cyclorotor dbr:Angle_of_attack dbr:Propeller_(aeronautics) dbr:Slowed_rotor dbr:Diameter_ratio |
| is foaf:primaryTopic of | wikipedia-en:Advance_ratio |
