Looking into the Working Section of Cell 3 West looking eastwards.
05|05|07 © Simon Cornwell 2007
Cell 3 West is the largest of the altitude test facilities and was designed to support the
development of large civil turbofan engines over their full flight envelope. Both connected and free jet
testing modes can be configured, and icing certification tests to CAA and FAA regulations can
be conducted by the installation of a spray rake that provides an icing cloud of controlled Liquid Water
Concentration (LWC) and droplet size. In addition to full engines, air frame components can be tested and
helicopter de-icing carried out.
The cylindrical test chamber has an internal diameter of 7.6m and a length of 15m of which
approximately 6m is avialble for engine installation, the remainder consisting of instrumented
inlet air ducting for air massflow measurement.
The air supplied to the chamber can be set between ambient temperature and -37°C by use of a
three stage cooler if required.
The eight Air House GEC compressors used in conjunction with
two additional compressors provide a maximum air massflow through the cell of 725 kg/s at ambient temperature
(545 kg/s when using the cooler).
The test engine is supported in a thrust frame that utilises two shear force load cells, (one on each side
of the test chamber), which are temperature controlled to ensure accurate engine thrust measurement. The
frame incorporates a bulkhead arrangement for automatic connection of many engine services and instrumentation
lines when the engine is lifted into position.
To enhance the cold performance of Cell 3 West, a new air supply is to be connected upstream
of the air cooler with the ability to inject 270 kg/s of dry air to mix with the atmospheric air drawn into
the air chamber.
Proposals are currently being considered for modifications to Cell 3 West to allow cost
effective operation as a sea level test bed. In this configuration the test engine would be mounted as for
a connected test, with air drawn through the intake cooler (although this need not be operational) and
exhausted locally without the requirement for the operation of the air processing plant.
Summary Of Data
|-37°C to Ambient
||1829 to 15543m
(6,000 to 51,000 ft)
© DERA 1995-2001
Taken from a DERA Brochure