Abstract: A tailpipe for a gas turbine engine has a cylindrical portion and lobed portion. The lobed portion extends a length X and has a plurality of circumferentially disposed peaks and valleys. Over at least the first 30 percent of length X, the radius of the each valley is greater than the radius of each peak and is greater than 10% of the equivalent diameter DE. Also, the effective flow area at the end of the lobed portion is greater that the effective flow area at its beginning. The cylindrical portion includes a straight portion and a canted portion.

Abstract: A modular multi-channel particle separator is provided to block foreign objects from entering the inlet of a gas turbine engine and to remove particulate matter from the inlet air stream before it reaches the compressor section of the engine. Each module is designed for easy fabrication from sheet material which can be readily configured to remove both fine and coarse particles from the air stream with minimal pressure loss, system volume and weight. Each module also defines passages for removing particular matter that has been intercepted and for conducting heating air through the module to prevent icing. The modular construction of the separator simplifies initial assembly in the gas turbine engine, as well as later maintenance and replacement of one or more modules, should that prove necessary.