In FIG. 4(a) gas nozzles 50 include found, which are arranged about stress area 32 of each vane 3. The six energy nozzles 50 of one vane 3 were positioned in an essentially straight or straight line, in essence parallel or synchronous to your top rated 38, from inside the upstream third of the vane 3, in other words. from inside the fuel entrances area 34.
In FIG. 4(b) the energy nozzles 50 were organized in the stress part 32 as defined above and, in addition, the suction area 31 receives nozzles 50. The energy nozzles 50 on the sucking area 31 are also organized in petrol entry region 34, so that one gas nose 50 from suction side 31 try opposing one nose 50 in the pressure side 32 of the same vane 3.
Gasoline treatment through fuel nozzles 50 on both side 31, 32 results in an increased mixing top quality, as gasoline injected from pressure part 32 is pushed from the movement toward the minimum radius Rmin, thus completing the interior a portion of the annulus, while fuel injected through the sucking part 31 is powered radially outwardly toward Rmax, therefore filling up the external an element of the annulus. The unmixedness of the fuel-air blend after premixing with swirler 43 are decreased by one factor of about 10 whenever modifying from one-side gas injections to two-side fuel shot.
FIG. 5 reveals the (non-dimensional) stress drop Dp* with as a function of the swirl number Sn from studies and CFD calculations. They obviously reveals that the stress drop Dp* lessens for modest swirl data sn.
The definition is such that unmixedness try zero (U=0) for fully molecularly premixed disease plus one (U=1) for molecularly segregated problems
FIG. 6 shows the reliance on the swirl amounts sn throughout the parameter I? for I±(Rmin)=20 qualifications and I±(Rmax)=50 grade. It is apparent that a I?-value of about 7 is likely to be picked to reach minimal swirl number of about 0.4 for vortex malfunction. In other words. with I?a‰?7 vortex malfunction was attained with sna‰?0.4.
s n = a?« R MIN R MAX a?? U a?? a?? W a?? a?? roentgen 2 a?? a?? a…† R roentgen maximum a?? a?« R minute R maximum a?? U 2 a?? a?? roentgen a?? a?? a…† roentgen with all the radius of swirler R, the axial element of the rate U and tangential the different parts of rate W at distance.
FIG. 7 reveals in (a) and (b), from a downstream end, samples of an annular combustors with burners 1 comprising swirlers 43 with swirl vanes 3 with a release stream angle I± according to creation. The burners 1 were delivered equally spread on group across the middle axis of a gas turbine and release the flammable blend of fuel and gas into an annular combustor. For the sample revealed in FIG. 7(a) each burner 1 includes one swirler 43. The vanes 3 were showed schematically. From inside the sample found in FIG. 7(b) exemplarily several five swirlers 43 are organized in a circular structure in each burner 1.
The burners of FIGS. 7(a) and (b) can also be used in combination with a plurality of can combustors rather than within one annular combustor.
States
a few swirl vanes with a streamline cross-section, each swirl vane creating a leading advantage, a trailing advantage, and a sucking part and a pressure part extending each around said respected and trailing borders, the swirl vanes getting arranged around a swirler axis, where stated leading border expand radially outwardly from stated axis, where circulation slot machines include created within sucking side of each swirl vane as well as the stress side of their circumferentially adjacent swirl vane, when at least one swirl vane keeps a discharge stream position (I±) between a tangent to the camber range at its trailing side as well as the swirler axis that will be monotonically increasing with growing radial range (roentgen) through the swirler axis, and where the trailing edge of each of the swirl vanes try rotated according to the innovative; and whereby a discharge circulation direction (I±) on stated radial distance (roentgen) is given by a purpose: brown [I±(R)]=KA·RI?+H, whereby I? was starting from 1 to 10, and K and H are constants preferred so that the release circulation perspective (I±(Rmin)) at a minimum radial length (Rmin) was from 0 levels to 20 levels in addition to discharge flow perspective (I±(Rmax)) at a max radial distance (Rmax) try from 30 degrees to 50 levels.