intake ramp

An intake ramp is a rectangular, plate-like device within the air intake of a jet engine, designed to generate a number of shock waves 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.Gunston and Gilchrist 1993, pp. 188-189. At supersonic flight speeds, the deflection of the air stream creates a number of oblique shock waves at each change of gradient along at the ramp. Air crossing each shock wave suddenly slows to a lower Mach number, thus increasing pressure.

Ideally, the first 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.

More advanced supersonic intakes feature a ramp with a number of discrete changes of gradient in order to generate multiple oblique shock waves. The first known aircraft to use this is the North American A-5 Vigilante with fully-variable wedge-type side air intakesGunston and Gilchrist 1993, p. 188. In the case of Concorde, the first (converging) intake ramp is followed by a diverging ramp. After the air passes the end of the first ramp it has become subsonic such that the diverging ramp further contributes towards the reduction in airstream velocity and consequently its increase in pressure. This intake design thus ensures excellent pressure recovery and contributes to Concorde's improved fuel efficiency whilst cruising supersonically at up to Mach 2.2 (beyond which airframe heating effects limit any further increase in speed).

Variable geometry intakes, such as those on Concorde, vary the ramp angle to focus the series of oblique shock waves onto the intake lip, control of which is accomplished by complex non-linear control laws using the ramp void pressure (the pressure of the air in the gap between the two ramps) as a control input.

The intake ramp for rectangular intakes has its equivalent in the inlet cone for circular intakes. Much lighter fixed-geometry alternatives are used on modern aircraft which are designed with greater emphasis on durability and survivability (stealth). These inlets preserve the performance of variable intake ramps by controlling shock position using the downstream pressure. They include the caret compression surface, used in the Boeing F/A-18E/F Super Hornet and Lockheed Martin F-22 Raptor inlets, and the diverterless supersonic inlet used on the Lockheed Martin F-35 Lightning II and Chengdu J-20.

Intake gallery

Image:Concorde Ramp.jpg, The ramps in two of the Concorde intakes are visible and clearly labelled as such.
Image:North American RA-5C Vigilante of RVAH-3 at Naval Air Station Sanford, Florida (USA), on 27 March 1968 (6430104).jpg, A-5 Vigilante with inlet ramps
Image:F-14_3_Yokota_Tokyo.jpg, F-14 with internal ramps forming upper surface of intake duct
Image:North American XB-70 above runway ECN-792.jpg, Vertical ramps on inboard surface of intake duct XB-70
Image:F-15E Strike Eagle is parked by a crew chief from Elmendorf Air Force Base.jpg, F-15 internal ramps form upper surface of intake duct behind the intake upper lips which are shown in different positions
Image:МиГ-25РБ, Историко-культурный комплекс «Линия Сталина» (4).jpg, MiG-25 ramp

See also

*Index of aviation articles
* Inlet cone
*NACA duct
* Splitter plate

References

External links

A-5 Vigilante intake ramp photos

{{Aircraft components

Aircraft propulsion components