Available bleed air mass flow rates

[wonderboysteve]

Hi, hopefully someone can help. I`m looking to find the available bleed flow rates at take-off and landing conditions for civil turbofans, together with the current bleed requirements of the aircraft they are fitted to.

The reason for the question is that I am conducting an evaluation of proposed flow control methodologies for future civil aircraft, and the ability to supply bleed air or electrical power is one of the important trade offs.

Thanks in advance!
Steve

[barit1]

Generally found in the engine model spec and installation manual. May be stated in either lbm/sec or as a % of core flow.