Military版 - Jet engine compressor architecture differences |
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W***n
发帖数: 11530 | 1 Architectural Differences: Rolls Royce engines differ with its American
counterparts GE and P&W in engine compressor architecture. Rolls Royce
design consists of three spool compressor— HP (High Pressure), IP (
Intermediate Pressure) and LP (Low Pressure) compressor—whereas American
engines have twin-spool compressors—HP & LP. Three spool compressors also
mean three concentric turbine shafts all running at different speeds.
Compressors are basically split into two or three spools to prevent
compressor stall or surge during acceleration from idle to 100% power.
Without compressor anti-stall architecture; it may surge or stall when the
throttle is suddenly rammed forward to come out of a difficult situation in
the air. Both concepts—European and American— have merits of their own.
Rolls Royce claims that its three spool compressor design makes the engine
shorter in length and a relatively cooler engine, requiring less maintenance
. The design also eliminates or reduces the need for variable stater vanes—
anti-stall device used in two spool compressor engines. It also enables the
fan to spin at a relatively slow speed increasing its efficiency. P&W’s
geared fan engines have same purpose of achieving fan efficiency. |
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