FUEL SYSTEM ACOUSTIC FEATURE TO MITIGATE COMBUSTION DYNAMICS FOR MULTI-NOZZLE DRY LOW NOx COMBUSTION SYSTEM

摘要

PROBLEM TO BE SOLVED: To solve the problem, wherein in a dry low NOx combustor, combustion dynamics are concerned as an element which may inhibit the activity of a system, shorten the service lives of components and reduce relative durability and fluctuation of air fuel ratio causes fluctuation of heat release amount, leading to continuance of the combustion dynamics as a result, and to provide a system for mitigating the combustion dynamics.;SOLUTION: A dry low NOx fuel nozzle 10 includes: one or more downstream orifices 20 formed to define a first fluid flow passage 21 along which fluid is directed to flow; an upstream orifice 40, located upstream from the downstream orifices 20, formed to define a second fluid flow passage 41 along which the fluid is directed to flow; and connecting passages 50, disposed to fluidly couple the first and second fluid flow passages of the downstream and upstream orifices, respectively, to one another. At least one of a radial size and an axial location of the upstream orifice 40 is set to cooperatively detune an acoustic impedance of a fuel system.;COPYRIGHT: (C)2011,JPO&INPIT