| 词条 | Wright XRJ47 | |||||||||||||
| 释义 |
The Wright XRJ47 was an American ramjet engine developed in the 1950s to help propel the rocket-launched SM-64 Navaho supersonic intercontinental cruise missile. Although the design flight Mach Number was 2.75, a peak flight speed of Mach 3.0, at altitudes up to about 77000 ft, was envisaged. This very large ramjet had a number of design problems, including some difficulty in light-up. Development of the Navaho missile was cancelled along with the ramjet engine in 1957. DesignThe single cone supersonic intake supplied ram air to a long annular diffuser terminating at the aft-mounted cylindrical combustion chamber. The centreline of the intake system was gently curved, presumably to line up the intake face with the flow-field of the missile nose section. The combustion chamber flame-holder consisted of a centre-body pilot region, with three annular V-gutters interconnected by slanted radial V-gutters. Fuel jets were of a variable area design. A heat-shield, with multiple exit ports, provided cooling air for the jetpipe and the fixed area ratio convergent-divergent propelling nozzle. The exit diameter of the nozzle equalled that of the combustion chamber. Specifications (XRJ47-W-5){{jetspecs|ref=Aircraft Engine Characteristics Summary: Ram-jet XRJ47-W-5[1], Preliminary evaluation of flight-weight XRJ47-W-5 ram-jet engine at a Mach number of 2.75[2] |type= Ramjet |length= {{cvt|390|in}} combustion chamber plus ducting and diffuser |diameter= {{cvt|48|in}} (combustion chamber)
|weight={{cvt|1011|lb}} |compressor= Ramjet inlet/diffuser |combustion=approx {{cvt|1887|K|F C}}
|turbine= |fueltype= JP-5 (F-44 / AVCAT) |oilsystem= |power= |thrust= {{cvt|3792|lbf|kN}} |compression= |aircon={{cvt|59.8|lb/s|kg/s}} |turbinetemp= |fuelcon={{cvt|10548|lb/h|kg/h}} |specfuelcon={{cvt|2.782|lb/lbf/h|kg/kN/h}} |thrust/weight={{cvt|3.75|lbf/lb|kN/kg}} }} References1. ^{{cite book |title=Aircraft Engine Characteristics Summary: Ram-jet XRJ47-W-5 |year=1957 |publisher=www.avialogs.com |url=https://www.avialogs.com/index.php/en/engines/usa/wright/xrj47/xrj47-w-5-ramjet-aircraft-engine-characteristics-summary-1-april-1957.html}} 2. ^{{cite book |last1=Welna |first1=Henry J. |last2=Reilly |first2=Dwight H. |title=Preliminary evaluation of flight-weight XRJ47-W-5 ram-jet engine at a Mach number of 2.75 |url=https://digital.library.unt.edu/ark:/67531/metadc53082/m2/1/high_res_d/19660027126.pdf |year=1955 |publisher=Lewis Flight Propulsion Laboratory, Cleveland, Ohio}} Further reading
1 : Ramjet engines |
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