Tommy Cookers wrote: ↑Wed Mar 04, 2020 3:10 pmthe turbine is significantly powered WGO by the exhaust pulse blowdownsaviour stivala wrote: ↑Tue Mar 03, 2020 5:53 pm....on the one hand it is suggested that fuel is burned in the exhaust ‘to jet power the turbine’ while on the other hand the waste-gate/s are opened to reduce back-pressure. Sounds like it have been forgotten that when waste-gate/s are opened the exhaust gasses are bypassing the turbine and so not powering the turbine.
(there's no 'backpressure'- mean exhaust pressure is 1 bar)
this is the 'free' power as used by 15000 airliner 'TurboCompound' engines before the jet airliner came along
couldn't some timed injection and/or skip-firing be used to increase pulse action ?
a stationary pulse-jet will produce thrust with intake pressure at 1 bar
“The turbine is significantly powered ‘WGO’ by pulse blowdown”. If by ‘WGO’ you mean (WASTE-GATES OPEN). When the formula 1 power unite is running with waste-gates open and so with the exhaust gasses bypassing the turbine (free load mode) and so not doing any work on the turbine. The reduction in exhaust back pressure will result in an additional power output gains by the engine.