Pratt & Whitney Canada JT15D

JT15D
JT15D at Canada Aviation Museum
Type Turbofan
National origin Canada
Manufacturer Pratt & Whitney Canada
First run 1967
Major applications Cessna Citation I
Cessna Citation V
Hawker 400
SIAI Marchetti S.211
Number built >6,000

The Pratt & Whitney Canada JT15D is a small turbofan engine built by Pratt & Whitney Canada. It was introduced in 1971 at 2,200 lbf (9,800 N) thrust, and has since undergone a series of upgrades to just over 3,000 lbf (13 kN) thrust in the latest versions. It is the primary powerplant for a wide variety of smaller jet aircraft, notably business jets.

Design and development

The JT15D is rare among modern turbofans in that it uses a centrifugal compressor as its main high-pressure system.[1] This was a common feature of early jet engines, but was quickly replaced by axial compressors in most roles due to its large frontal size. In the turbofan role most of the jet thrust is generated by the cold air blown past the engine, and the internal "jet" portion is quite small. In this role the high single-stage compression of the centrifugal design has advantages, and the main reason most small turbofans don't use them is that they are often developments of previous turbojet designs.

In the JT15D the fan blows about 70% of the air into the bypass duct, producing most of the overall thrust. On JT15D-4 models and above there is a small "booster" axial stage just behind the fan which is running at the same speed as the fan and directing the remaining 30% of the airflow into the engine core. This air is further compressed by the centrifugal stage, and burned in a reverse-flow annular combustor. The hot gases flow through a "high-pressure" turbine that drives the centrifugal stage, and then two more turbines driving the fan and booster.

The engine was first run in August 1967 before being test flown on a Avro Canada CF-100 Canuck in an underslung external test pod.[2]

Variants

A JT15D at the Frontiers of Flight Museum

The first model, the JT15D-1, was introduced to power the Cessna Citation I, then known as the Fanjet 500. Deliveries started in 1972, and eventually on 1,417 -1s were delivered. The JT15D-4 was introduced the next year, improving thrust to 2,500 lbf (11,000 N). The -4 was the primary engine for the Cessna Citation II, and went on to find use on the Mitsubishi Diamond 1A, Aerospatiale Corvette and SIAI Marchetti S.211. Eventually 2,195 engines of the -4 series were delivered.

The next major model was the JT15D-5, certified in 1983. The first versions delivered 2,900 lbf (13,000 N) and were used on the Beechjet 400A and Cessna T-47A. Several minor versions were introduced, the -5A for the Cessna Citation V, while the -5B powered the Beechcraft T-1A Jayhawk, the -5C the DASA Ranger 2000 and S-211A.

A more major upgrade was the JT15D-5D, which was certified in 1993. It increased thrust again, this time to 3,045 lbf (13,540 N). The -5D is used on the Cessna UC-35A and Cessna Citation Ultra.

Applications

Specifications (JT15D-5D)

General characteristics

Components

Performance

Engine Takeoff
thrust (kN) 		Continuous
thrust (kN)		 Length (mm) Fan
Diameter(mm) 		Diameter.(mm) Dry
weight (kg) 		Bypass
ratio
JT15D-1 9,8 　9,3 1506 691 223,5 3,3
JT15D-4 11,12 　10,56 1600 686 253 2,6
JT15D-4C 11,12　　10,56 1600 686 261 2,6
JT15D-5 12,92　 1600 287 2
JT15D-5A 12,92　 1600 287 2
JT15D-5B 12,92　 1600 292 2
JT15D-5C 14,21　 1600 302 2
JT15D-5D 13,56　 1531 520 292,6 3,3
JT15D-5F 12,92　 1600 288 2

References

Notes

  1. ↑ Gunston 1989, p.131.
  2. ↑ "On Test at Longieuil". Flight International: 263. 13 February 1969.

Bibliography

  • Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
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