FORBRENNINGSAPPARAT

摘要

1536166 Gas turbine combustion chambers PHILLIPS PETROLEUM CO 13 April 1976 [14 April 1975(2)] 15074/76 Heading F1L [Also in Division F4] A combustor 10, for example for a gas turbine engine, comprises a flame tube 14 closed at its upstream end by a dome member 18 including an inlet 24 for fuel and an adjustable inlet for primary cumbustion air, which open into a combustion zone 27 surrounded by a set of tangential air inlets 28, there being in the flame tube a further combustion zone 31 downstream from the zone 27 and surrounded by a set of tangential air inlets 30. The two sets of tangential air inlets are preferably directed in opposite senses, and there may be a further set of air inlets 34 at the downstream end of the flame tube. The inlets 28 are formed as slots in a wall section 36 which abuts an adaptor 26 and which defines an inwardly tapering passage leading to an orifice 29 communicating with the combustion zone 31, while the inlets 30 are formed as slots in a further section 38 which abuts the section 36 and which defines an orifice 32 and an outwardly tapering passage leading to the downstream part of the flame tube 14. Alternatively, Fig. 11 (not shown) the passage within the section 38 may be cylindrical and have at its downstream end a radially extending wall (33) in which is the orifice 32. The air inlets communicate with an annular space 16 defined between the flame tube 14 and a casing 12; alternatively they may be supplied with air through separate conduits. The flame tube 14 may be cylindrical throughout its length, or, Figs. 11, 13, 14 (not shown), its downstream end may taper inwardly in one radial direction to give an elongate cross-section. The dome member 18 comprises either two plates (128, 142) perpendicular to the axis, with sets of axial apertures, Figs. 4-6 (not shown), or two coaxial sleeves (801, 100) with sets of radial or tangential apertures, Figs. 8-10 (not shown), the sets of apertures in each case being of equal size and spacing and movable into and out of register by rotation of one of the plates or sleeves. The primary air supply may be controlled in dependence on the fuel supply. Extensive comparative data are given for operation of combustors of the invention and for combustors without provision for variable introduction of primary combustion air.