PORTABLE KAHN SERIES
DYNAMOMETERS
FOR TESTING
AEROSPACE
102
TURBINES
KAHN INDUSTRIES, INC.
KAHN SERIES 102 HYDRAULIC CONSTRUCTION
DYNAMOMETERS FOR LOAD Series 102 hydraulic dynamometers feature two sets of
TESTING AEROSPACE ENGINES power elements (rotors and stators) capable of fully bi-
directional operation. The power elements are made
from highly cavitation and corrosion resistant stainless
Designed primarily for steady-state and transient per- steel. This material is also used for the shaft and other
formance testing of medium speed turboshaft engines and rotating components.
small turboprop engines, the Kahn Series 102 product The rotor assembly is supported by grease-packed,
line includes five standard models capable of absorbing spring-loaded precision ball bearings. Through the use
up to 3000 hp (2240 kW) and operating at rotational of advanced, highly water-resistant high-speed greases,
speeds up to 11,000 rpm. Kahn has eliminated the environmental hazards associ-
Proven in engine test facilities around the world, ated with oil-mist lubrication. To assure smooth, vibra-
the Series 102 offer long service life coupled with mini- tion-free operation, the rotor assembly is dynamically
mum maintenance requirements. All units are fully balanced in accordance with high-speed turbine require-
compatible with advanced, fast-response FADEC (Full ments.
Authority Digital Electronic Control) engine control sys- Positive sealing between the water and bearing com-
tems and meet or exceed the test specifications of all partments is accomplished with a mechanical carbon face
current turboshaft and small turboprop engines, includ- seal. This feature permits operation of the dynamometer
ing the following: under all conditions including zero speed. Unlike with
labyrinth seals, there is no need to unload the dynamom-
Honeywell: AGT1500, LTS101, LTP101, T53, TPE331/T76 eter during shutdowns to prevent water from entering the
Pratt & Whitney: PT6A, PT6B, PT6T/T400, PW200 bearings.
Rolls-Royce: 250-B, 250-C/T63, Gem The dynamometer module is supported in the trunnion
Turbomeca: Arriel, Arrius, Artouste, Astazou mount by rugged, tapered roller type trunnion bearings.
Consortium: MTR390. This results in smooth, vibration-free operation under the
most severe operating conditions as well as excellent
DESIGN BENEFITS torque measurement accuracy.
Featuring a simple modular design concept, the
Built to meet the most demanding engine test require- Series 102 dynamometers consist of less than 30 com-
ments, the Kahn Series 102 dynamometers offer a num- ponents (excluding assembly hardware). Their simple de-
ber of important design benefits: sign requires only minimum maintenance and allows for
quick field overhaul.
• Easy to install and to operate.
• Flange mounted configuration permits alignment-free
installation directly to the engine or the flywheel.
• Stainless steel power elements are highly cavitation
and corrosion resistant providing superior service life.
• Positive sealing assures quick and safe emergency
shutdowns.
• Positive sealing permits operation at all attitude posi-
tions from horizontal to vertical.
• Perforated disc power elements absorb full power in
both directions of rotation.
• Inherently steep, open-loop torque speed characteris-
tic assures stable steady-state operation.
• Low moments of inertia and small internal water vol-
umes permit rapid transient response.
• Grease lubrication eliminates environmental hazards
associated with oil-mist lubrication.
• Simple modular design concept permits quick overhaul
by the user.
1 Perforated Disk Rotors 6 Trunnion Mount
2 Shaft 7 Shaft Bearings
3 Housing Cap 8 Trunnion Bearings
4 Endcap 9 Carbon Face Seal
5 Housing Ring 10 60-tooth Gear
POWER ABSORPTION MECHANISM
The power output from the engine is absorbed by water
vortices generated in the perforated disc rotors and
stators. The resulting drag applies a moment to the
dynamometer housing which is measured by a strain-
gage load cell mounted to the torque arm.
Absorbed power is controlled by modulating the
amount of water in the dynamometer with the inlet and
outlet control valves.
WATER REQUIREMENTS
A continuous flow of water through the dynamometer is
required to provide resistance to rotation and to remove
the heat generated by the power absorption process.
Based on a maximum water outlet temperature of
140˚F (60˚C), water flow requirements range from
4 gal/hr hp (20 l/hr kW) for once through water systems
to 6 gal/hr hp (30 l/hr kW) for recirculating water systems.
The following water flow rate and temperature data
apply for installations using recirculating systems with
evaporative cooling towers:
MODEL
Specific Water Flow Rate 6.0 gal/hr hp (30 l/hr kW) 102-130
Water Supply Pressure 50 psig (3.5 bar)
Water Inlet Temperature 90˚F (32˚C)
Water Outlet Temperature 140˚F (60˚C)
Filtration 40-mesh screen
(340 micron)
SPECIFICATIONS OPERATING RANGE
Max. Max. Max. Dry
Power Speed Torque Weight
Model hp rpm lb-ft lbs
102-100 1200 11000 900 285
102-130 1800 9000 1600 285
102-160 2400 7200 2400 375
102-200 3000 6000 3000 750
102-240 3000 4500 4000 880
Model 102-130 portable dynamometer
mounted via adapter and quill shaft
directly to T53 turboshaft engine.
MANUAL CONTROL SERIES 514 ENGINE TEST STANDS SERIES 505
• Two fast-acting electro-pneumatic valves for fast Manufactured from rectangular structural steel, the
dynamometer control with the ability to conduct engine test stands are designed to rigidly support both
transient testing. the dynamometer and the engine during the performance
• Testing applications include speed governed engines test. Stationary and/or mobile engine test stands are avail-
and gas turbines. able for a wide variety of diesel, turboprop and turboshaft
engines, including the latest generation of high speed
gas turbine engines. Each stand is fully analyzed to
AUTOMATIC CONTROL SERIES 545
ensure that it is rigid and that trouble-free operation is
• Latest generation design, with adaptive control. inherent in the design.
• Very fast control capability to meet the most • Static finite element computer analysis eliminates shaft
demanding steady-state and transient test require- misalignment due to deflections under engine loads.
ments for dynamometer control when testing aircraft • Dynamic finite element computer analysis ensures
engines and experimental gas turbines. freedom from harmful vibration, whether due to a forced
• Electro-hydraulic valves for fastest control, with full vibration or a resonant vibration.
stroke in less than 100 milliseconds, allows the dyna-
mometer control system to be faster than most engine
control systems.
• Manual mode and three closed loop automatic modes
for flexible control of all engine types:
– Automatic speed control
– Automatic torque control
– Automatic power law relationship between
speed and torque.
• Numerous features to suit the application and user:
– Bumpless transfer
– Storage/retrieval of multiple PID settings
– Built-in speed calibration
– Pushbutton selectable English and metric NOTE: The information included herein was correct at the time of publication and
units supersedes all previous data. It is our policy to continually improve our products to
insure even better performance. Consequently, current Kahn products may
– Demand signal display incorporate modifications not shown on these pages.
No. 6014. Printed in U.S.A.
885 Wells Road, Wethersfield, CT 06109
KAHN INDUSTRIES, INC. Phone (860) 529-8643 Fax (860) 529-1895 E-mail dynos@kahn.com
