Development of aviation fuel,
hydraulic and electrical systems.

CENTRIFUGAL PUMP UNITS WITH HYDRODYNAMIC TORQUE CONVERTE

Displacement pumps are generally used for fuel supply into the main combustion chamber of the aircraft engine.

Centrifugal pumps have substantial advantages over displacement pumps.

A disadvantage of centrifugal pumps is the difficulty to provide the required level of pressures in all flight modes and especially at low shaft speed.

Because of this, the use of centrifugal pumps, despite of their advantages, is quite limited as a high-pressure pump for the aircraft engine main fuel system.

Engine driven pumps for afterburner fuel supply represent one-stage high-speed centrifugal pumps. Fuel consumption through the afterburner fuel system can vary by more than 100 times. In addition, fuel flow from the pump must be shut-off when the engine is not using the afterburner.

As a result of large complex of R&D works performed by Kristall Design Bureau, the high-performance centrifugal pump units with adjustable hydrodynamic torque converter have been developed, which have original geometry of fuel-flow cavities, optimized energy, cavitation and mass characteristics.

These units have the torque converter pump wheel driven by the engine gearbox, while the turbine wheel is connected to the primary pump impeller.

Adjustable guide wheel within the torque converter allows for changing of the pump delivery rate. These pumps can serve as a single, unified fuel supply units for both main and afterburner engine fuel systems, featuring low fuel heating over the whole range of required flow rates.

Adoption of such pump units can significantly expand possibilities of engines for the new generation aircraft.

Designation Рт Qт Speed Differential pressure Mass, max Working fluid Dimensions
kgf/cm2 l/h rpm kgf/cm2 kg mm
NGP-1 4,5 38000 11200-16800   12,0 fuel 270х185х180
NGP-2 0,5-7,5 56000 16000-23100 25-110 12,0 fuel 284х196х166
NGP-117 4,5-7,0 500-60000 17000-28245 15-94 16,5 fuel 341х240х233