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Thanks Chris, seems simple enough. But why are they called a "poke" burner? Cause you poke holes in a tube to make the burner? I kept reading it Pork burner the first several times I saw it and thought it was what Cletus uses to do his Barbecuing! Kim
Hi Chris, do you know the size of those jets? I will check butane vapour pressures tomorrow, and can make a reasonable estimate of the change in flow and heat input from the sizes if you have them. Even if not, the increase in flow with the necessary additional area should give much better capacity to maintain the steam pressure for you. Certainly the quickest fix from the current position.We have a house full of visitors for the next three days, so while I will check in and keep up with any posts, I will need to keep my input brief until they are gone.Thanks to all for looking in.MJM460
But even the gas turbines that power aircraft have primary then secondary air introduction, and sometimes even tertiary air, but that is entirely another subject.
The extra air inlets in an aircraft gas turbine has everything to do with cooling - as they create a boundary layer between the very hot combustion gasses and the metal of the engine. Getting the more than 1700 degree centigrade combustion gasses separated from the metal is vital for engine life The first two (or more) turbine wheels has hollow blades that are air cooled from the inside + holes for letting some of the cooling air out to form yet another boundary layer around the blades.A certain percentage of the incoming air is use for cooling the engine parts at different locations. The first is use to cool the last compressor stages, then maybe 40% is feed to the combustion chamber for power production. The next is use to cool the outside of the chamber and enters as secondary air as cooling (some might be used to burn too). Now some is used to cool the turbine housing and stator blades.There is more than one airflow in a modern engine :One going through the inner parts and out through the last rotating compressor blades and out through the first rotating turbine blades.Next layer goes through the power section and is burned.Third layer is used to cool stator + turbine blades and combustion chamber + turbine chamber.All modern Jet engines has a bypass fourth layer created from the big fan in the inlet - this is the main thrust and also cools the outside of the engine (not the part we see outside) - you will not see the fourth layer in a gas turbine for helicopters for instance.