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Pratt & Whitney J52
The Pratt & Whitney J52 (company designation JT8A) is an axial-flow turbojet engine originally designed for the United States Navy,〔Gunston 1989, p.122.〕 in the 9,000 lbf-class. It powered the A-6 Intruder and the AGM-28 Hound Dog cruise missile. The engine is still in use in 2011 in models of the A-4 Skyhawk and the EA-6B Prowler. The engine also provided the basis for the Pratt & Whitney JT8D, a popular civilian low-bypass turbofan engine.
==Design and development==
The J52 was developed in the mid-1950s for the US Navy as a scaled-down derivative of the J57/JT3A.〔Gunston 2006, p.154〕 It was initially intended to power the A4D-3 Skyhawk, an advanced avionics model that was canceled in 1957. After being canceled, the U.S. Air Force selected the J52 to power the AGM-28 Hound Dog cruise missile. The engine was designed with several unique features for this application, including a "conical centerbody mounted in the intake" and a "variable central plug ... in the nozzle".〔Quotations from ''Flight'', 1961〕 Then, in 1958, the US Navy selected the engine to power what became the A-6 Intruder.
The J52-P-6 model, designed for the YA2F-1 (YA-6A) Intruder, had a unique nozzle that could be angled downward at 23 degrees for STOL takeoffs; this was not used on production A-6s. Returning full circle, the J52 was selected to power the A4D-5, another model of the A-4 Skyhawk, remaining in all subsequent new-built models.〔Aero Engines 1961 (1961). ''Flight'', July 20, 1961. pp 93-94.〕
The twin-spool J52 employs a split 12-stage axial compressor consisting of a five-stage low pressure unit and a seven-stage high pressure unit. Behind the compressor is a nine-unit can-annular combustion chamber and a two-stage split turbine.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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