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Wave Rotor Topping Cycles
for Gas Turbine Engines
Engine Cycle Deck Simulation
Baseline and wave rotor-enhanced turboshaft and turbofan engine
performance level estimates may be obtained from a cycle deck in
which the wave rotor is represented as a burner with pressure gain.
The NEPP cycle deck uses scaleable compressor and turbine maps to
calculate on and off-design engine performance. To calculate the
enhanced engine performance, the wave rotor is mimicked by replacing
the pressure drop of the burner component of the baseline engine with
the calculated pressure gain of the wave rotor while keeping heat
addition the same. Pressure drops are added upstream and downstream
of the wave rotor to simulate the losses in the ducts between the
compressor and the wave rotor and between the wave rotor and the high
pressure turbine.
The wave rotor-enhanced engine is "redesigned,"
holding corrected airflow into the engine, heat addition (fuel flow),
cooling and bleed flows, and turbine inlet temperature identical to
those of the baseline engine at design (Mach 0.0, sea-level). In
addition, the net thrusts of the baseline and enhanced turboshaft
engines are the same, while the bypass ratios of the turbofan engines
are the same (except in the one case noted in the Table). Therefore,
the fan and compressor components of the baseline and enhanced
engines are identical. The corrected flow to the burner and the high
pressure and power turbines of the wave rotor-enhanced engine however
are reduced. In the present calculations, the turbine maps are
scaled to accommodate the lower corrected flow. In application, the
change in corrected flow means either a redesign of the high pressure
turbine and low pressure turbine or, if the wave rotor is added to an
existing machine, derivative turbines and compressors of that engine
can be mixed to match as closely as possible.
Contact: Scott Jones
email: Scott.M.Jones@grc.nasa.gov
Project Contact:
Daniel E. Paxson
Phone: (216) 433-8334
email: dpaxson@grc.nasa.gov
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