Reverb_SR71
24th Nov 2013, 19:09
bleedless anti ice vs Pneumatic Anti ice when compared to the load and power draw from the engine.
In a normal bleed based anti ice system there is an increase in fuel consumption as the system is turned on as some of the mass flow is used up ( energy is being tapped from the engine to power it) , this is shown in the cruise performance tables etc .
My question is does the 787s bleed system have any similar effects ? cause normal electrical loads run off the IDG dont have any such problems i think ? . or does it have a similar effect ? .
My understanding is there will be similar effects as the power put on the IDG will demand extra torque from the driving shaft and will cause similar increase in fuel flow and consumption.
Thanks
In a normal bleed based anti ice system there is an increase in fuel consumption as the system is turned on as some of the mass flow is used up ( energy is being tapped from the engine to power it) , this is shown in the cruise performance tables etc .
My question is does the 787s bleed system have any similar effects ? cause normal electrical loads run off the IDG dont have any such problems i think ? . or does it have a similar effect ? .
My understanding is there will be similar effects as the power put on the IDG will demand extra torque from the driving shaft and will cause similar increase in fuel flow and consumption.
Thanks