Originally Posted by SASless
A measure of the "work done to the air" is confirmed by the loss of power experienced when using bleed air. That energy has to be demonstrated somewhere.
I'm a rookie at this whole turbine engine thing (arguably at this whole flying helicopters thing in general!) and have a question that relates to this... My (limited) understanding is that the limiting effect of taking bleed air off the engine is to remove cooling air (hot as it is) from the system resulting in higher operating temperatures (t4 / tot). Is this the action that causes "power loss" becuase the engine will reach it's temperature limitation while still at a lower throttle setting, or is the power loss due to the loss of some air otherwise used for combustion, or some other factor I'm not considering.
I guess I'll play around with the heater tomorrow morning (if it's cool enough) that ought to help my grasp a little...