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Old 17th Jul 2011, 19:57
  #84 (permalink)  
Turbine D
 
Join Date: Dec 2010
Location: Middle America
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Hi Bear,

In a purist sense, be it a fan-less jet engine or a turbo fan engine, the turbine or turbines drive the compressor or compressor/fan combination. The only time the compressor or compressor/fan combination "drives" is during the start operation. Here, the compressor or compressor/fan combination through an auxiliary energy source initiates rotation, driving the turbine/turbines while compressing the air delivered to the combustor. When the combustor delivered air pressure is sufficient, fuel flowing into the combustor is ignited. From that point onward, the turbine/turbines drive the compressor or compressor/fan combination.

Hope this clarifies this discussion.
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