Divertless Supersonic Inlet (DSI)

choi

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(1) F-35
http://www.jsf.mil/f35/f35_technology.htm
(Technology: "Diverterless Inlet   The F-35's diverterless inlet lightens the overall weight of the aircraft. Traditional aircraft inlets were comprised of many moving parts and are much heavier than newer diverterless inlets. The diverterless inlet also eliminates all moving parts.")

(2) Divertless inlet
(a) Photo: frontal view of J-20.  
http://www.flightglobal.com/blogs/flight-international/2011/01/j-20---the-camera-doesnt-lie.html

(b) Timur Mohammad, JF-17 Divertless Supersonic Inlet / DSI. Aug 7, 2008.
http://picasaweb.google.com/lh/photo/oYZ0Cbyddro_ARRsHsGKmQ

(c) luca28, China's two-seat attack version of the J-10 fighter aircraft. Jan 19, 2009.
http://www.militaryphotos.net/forums/showthread.php?149844-China-s-two-seat-attack-version-of-the-J-10-fighter-aircraft
("The new version, which is variously referred to as J-10B or J-10C, features improvement such as Divertless Supersonic Intake (DSI) engine air intake")

My comment: There is only ONE intake, in the belly--not two in the sides.

(3) But what does a diverter plate look like?
(a) Quest for Performance: The Evolution of Modern Aircraft. Part II: THE JET AGE; Chapter 10: Technology of the Jet Airplane; Turbojet and Turbofan Systems.  
http://www.hq.nasa.gov/office/pao/History/SP-468/ch10-3.htm

Read paragraph 244 (paragraph number is at the beginning of each paragraph) AND see Figure 10-10(a) (McDonnell Douglas F-4 fighter) and (b) (F-111).

(b) Richard T. Whitcomb
http://en.wikipedia.org/wiki/Richard_T._Whitcomb
(the photo: F-106)

(c) Boeing F/A-18E/F Super Hornet
http://en.wikipedia.org/wiki/F-18_Super_Hornet

See the photo in section 2.1 Airframe changes, whose caption read, "Rectangular Super Hornet vs oval Hornet air intakes."

The angle of the Hornet photo clearly shows a diverter plate

Here is another photo of F/A-18 Hornet fighter: Photos 4 and 5 in
http://theasiandefence.blogspot.com/2009_03_01_archive.html

(4) But what is the function of a diverter plate?

What is Divertless Supersonic Intakes?  Answer.com, undated.
http://wiki.answers.com/Q/What_is_Divertless_Supersonic_Intakes

Quote:

"A: Divertless Supersonic Intakes (DSI) is an air intake that was designed for supersonic flight regime, so the plane doesn´t need to have any variable-geometry airintake, that´s why it is called DSI. In supersoniv flight regime, it is hard for an airplane to turn, especially kulbit. In order to gain airflow to the engine, most fighters uses variable-geometry air intakes, or moving air intakes that we could found in F-22, or Su-27, or MiG-29, or any other fighters. Fighter such like F-35 doesn´t need any moving parts because it uses DSI. DSI automatically gain airflow to the engine in supersonic flight regime. I hope it helps, have a nice day!

Note: Kulbit
http://en.wikipedia.org/wiki/Kulbit


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