Patent GB-758345-A (GB)
Title: Improvements relating to combustion systems
Inventor: SPALDING DUDLEY BRIAN
IPC: F23R3/26
Filed: 1952-10-15
Abstract: <PICT:0758345/IV(a)/1> <PICT:0758345/IV(a)/2> Combustion equipment, for example a gasturbine engine or reheat equipment of a gasturbine jet-propulsion engine, applicable to the production of acetylene from methane and oxygen, comprises a duct through which flows combustion-supporting gas such as air (flows), the duct having in its length a portion of greater cross-sectional area and offset laterally with respect to a portion immediately upstream thereof, the enlarged portion forming a combustion region and being so shaped as to constitute a sudden and substantial enlargement in the duct.  A flame stabilizing baffle is disposed with at least its upstream end at the entrance to the sudden enlargement, the baffle together with the sudden enlargement causing recirculation of gas in the enlarged portion.  Means for introducing fuel into the air stream, also ignition means, are provided.  In Fig. 1, the duct is of cranked section, the portion 13 constituting the enlarged portion and a cascade of vanes 12 is disposed near the sudden enlargement the vanes operating in the stalled condition and causing the air stream to eddy.  Fuel is injected into the stream at 34 and straightening vanes 15 are disposed at the exit from the enlarged portion.  In Fig. 2 the duct is enlarged at 19 and a baffle plate 17 is disposed near the enlargement, the baffle plate forming a combustion duct 19 and a diffuser duct 18 through which a stream of dilution air flows.  Fuel is injected at 20 into the eddying or recirculating flow of air.ALSO:<PICT:0758345/III/1> <PICT:0758345/III/2> Combustion equipment, for example of a gas turbine engine or reheat equipment of a gas turbine jet propulsion engine, applicable to the production of nitric oxide, comprises a duct through which flows combustion-supporting gas such as air, as such or enriched with oxygen the duct having in its length a portion of greater cross-sectional area and offset laterally with respect to a portion immediately upstream thereof, the enlarged portion forming a combustion region and being so shaped as to constitute a sudden and substantial enlargement in the duct.  A flame stabilizing baffle is disposed with at least its upstream end at the entrance to the sudden enlargement, the baffle together with the sudden enlargement causing recirculation of gas in the enlarged portion.  Means for introducing fuel into the air stream, also ignition means, are provided.  In Fig. 1, the duct is of cranked section, the portion 13 constituting the enlarged portion and a cascade of vanes 12 is disposed near the sudden enlargement the vanes operating in the stalled condition and causing the air stream to eddy.  Fuel is injected into the stream at 34 and straightening vanes 15 are disposed at the exit from the enlarged portion.  In Fig. 2 the duct is enlarged at 19 and a baffle plate 17 is disposed near the enlargement, the baffle plate forming a combustion duct 19 and a diffuser duct 18 through which a stream of dilution air flows.  Fuel is injected at 20 into the eddying or recirculating flow of air.