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- Intake_ramp abstract "An intake ramp is a rectangular, plate-like device within the air intake of a jet engine, designed to generate a shock wave to aid the inlet compression process at supersonic speeds. The ramp sits at an acute angle to deflect the intake air from the longitudinal direction. At supersonic flight speeds, the deflection of the air stream creates an oblique shock wave at the forward end of the ramp. Air crossing the shock wave suddenly slows to a lower Mach number, thus increasing pressure.Ideally, the oblique shock wave should intercept the air intake lip, thus avoiding air spillage and pre-entry drag on the outer boundary of the deflected streamtube. For a fixed geometry intake at zero incidence, this condition can only be achieved at one particular flight Mach number, because the angle of the shock wave (to the longitudinal direction) becomes more acute with increasing aircraft speed.Some supersonic intakes feature two or more ramps, operating in series, to generate multiple oblique shock waves. Each downstream ramp is steeper in inclination than the previous ramp. These intakes are usually more efficient than single (oblique) shock wave inlets.For a fixed geometry it is feasible to use curved intakes without any shocks before the final normal shock.Modern fighter jets (like the F-22 Raptor) have engines so powerful that top speed is not limited by them,thus spillage at the intake is acceptable and a lightweight fixed geometry chosen. The nacelle has a round outer lip to defect spillage back into the longitudinal direction. The nacelle thus gets a very large cross section with more volume than needed for the engineand in the F-22 the nacelles are combined with the fuselage to create a large weapon bay, place for fuel, and a wide body, which generates some lift.Modern jets have a horizontal ramp thus spillage at least produces some lift.In case of the F-22 the inlet has two ramps placed in a diamond shape, thus for most Mach- and thrust-conditions spillage occurs only at the aft / lower corner of that diamond.In case of the F-22 the leading edges of the wing become supersonic at Mach 1.8 and certainly are as large a source of wave drag as the inlet.Variable geometry intakes, such as those on Concorde aircraft, vary the ramp angle to focus the oblique shock wave/s onto the intake lip.".
- Intake_ramp thumbnail F-15E_Strike_Eagle_is_parked_by_a_crew_chief_from_Elmendorf_Air_Force_Base.jpg?width=300.
- Intake_ramp wikiPageID "9858460".
- Intake_ramp wikiPageLength "3249".
- Intake_ramp wikiPageOutDegree "15".
- Intake_ramp wikiPageRevisionID "694015617".
- Intake_ramp wikiPageWikiLink Category:Aircraft_propulsion_components.
- Intake_ramp wikiPageWikiLink Components_of_jet_engines.
- Intake_ramp wikiPageWikiLink Concorde.
- Intake_ramp wikiPageWikiLink Grumman_F-14_Tomcat.
- Intake_ramp wikiPageWikiLink Inlet_cone.
- Intake_ramp wikiPageWikiLink Jet_engine.
- Intake_ramp wikiPageWikiLink Lockheed_Martin_F-22_Raptor.
- Intake_ramp wikiPageWikiLink Mach_number.
- Intake_ramp wikiPageWikiLink North_American_XB-70_Valkyrie.
- Intake_ramp wikiPageWikiLink Pressure.
- Intake_ramp wikiPageWikiLink Shock_wave.
- Intake_ramp wikiPageWikiLink Splitter_plate_(aeronautics).
- Intake_ramp wikiPageWikiLink Supersonic_speed.
- Intake_ramp wikiPageWikiLink File:F-15E_Strike_Eagle_is_parked_by_a_crew_chief_from_Elmendorf_Air_Force_Base.jpg.
- Intake_ramp wikiPageWikiLinkText "Intake ramp".
- Intake_ramp wikiPageWikiLinkText "fixed geometry intake".
- Intake_ramp wikiPageWikiLinkText "fixed-geometry".
- Intake_ramp wikiPageWikiLinkText "intake ramp".
- Intake_ramp wikiPageWikiLinkText "pitot intake".
- Intake_ramp wikiPageWikiLinkText "variable intake ramp".
- Intake_ramp wikiPageWikiLinkText "variable-geometry inlet duct".
- Intake_ramp wikiPageUsesTemplate Template:Aircraft_components.
- Intake_ramp wikiPageUsesTemplate Template:Or.
- Intake_ramp wikiPageUsesTemplate Template:Unreferenced.
- Intake_ramp subject Category:Aircraft_propulsion_components.
- Intake_ramp hypernym Device.
- Intake_ramp type Device.
- Intake_ramp type Component.
- Intake_ramp comment "An intake ramp is a rectangular, plate-like device within the air intake of a jet engine, designed to generate a shock wave to aid the inlet compression process at supersonic speeds. The ramp sits at an acute angle to deflect the intake air from the longitudinal direction. At supersonic flight speeds, the deflection of the air stream creates an oblique shock wave at the forward end of the ramp.".
- Intake_ramp label "Intake ramp".
- Intake_ramp sameAs Q14592527.
- Intake_ramp sameAs Lorong_masukan.
- Intake_ramp sameAs m.02pv1sz.
- Intake_ramp sameAs Q14592527.
- Intake_ramp wasDerivedFrom Intake_ramp?oldid=694015617.
- Intake_ramp depiction F-15E_Strike_Eagle_is_parked_by_a_crew_chief_from_Elmendorf_Air_Force_Base.jpg.
- Intake_ramp isPrimaryTopicOf Intake_ramp.