Design of Lean Premixed Multi-Swirl Combustor Dome Structure for Gas Turbine

doi:10.12096/j.2096-4528.pgt.21123

Abstract

Abstract:

Five kinds of multi-head burners with different structures were discussed according to potential flow theory in this paper. Three cases were selected for further numerical simulation from the consideration of cross fire, wall temperature and flow field. The influence of the rotation direction of the main stage and central class burner on the combustion characteristics was investigated by computational fluid method. The results show the rotation direction of the main swirlers are beneficial to the cross fire, but it will cause hot spots in the asymmetric flow field, which will affect the NO _x emission and the cooling of the liner. The tulip-shaped flame is longer when the pilot swirler is counter rotating with main swirlers. When all swirlers rotate in the same direction, there is only one tulip-shaped flame. If the rotations of two adjacent main swirlers are different, a stable pair of tulip-shaped flames and a pair of open flames are produced.

Key words: gas turbine, swirled premixed combustor, multi-head structure, potential flow theory, combustion characteristic, numerical simulation

CLC Number:

TK 472

Yang YANG, Desan GUO, Yaoqiang LI, Jinqi ZHANG. Design of Lean Premixed Multi-Swirl Combustor Dome Structure for Gas Turbine[J]. Power Generation Technology, 2023, 44(2): 183-192.

Figures/Tables 21

Fig. 1 Vortex and counter rotating vortex (dipole) burners

Fig. 2 Streamlines and velocity magnitude contours of vortx and counter rotating vortex structures

Fig. 3 Velocity distribution in x and y direction varies with the head spacing in two rotating directions

Fig. 4 Head nozzle arrangement structure (opposite direction of coming flow)

Fig. 5 Streamlines and velocity magnitude in different rotational configurations (viewing from downstream to upstream)

Tab. 1 Parameters and boundary condition of different fuel nozzle

工况	孔数	压力面喷孔		吸力面喷孔
工况	孔数	速度/(m/s)	流量/(g/s)	速度/(m/s)	流量/(g/s)
基准型	压力面、吸力面各2孔	71.23	0.83	73.07	0.83
改型1	压力面、吸力面各4孔	36.57	0.83	37.05	0.83
改型2	压力面4孔	73.13	1.66	0	0

Fig. 6 Structure of pilot burner and vane

Tab. 2 Structure of different multi-head Cases

算例	旋流排布(图5)	每叶片喷嘴数目	中心体端面	主旋旋向	值班级旋向
1	(a)	4	平面	4CW	1CW
2	(a)	8	平面	4CW	1CW
3	(a)	8	椭圆面	4CW	1CW
4	(b)	8	椭圆面	4CW	1CC
5	(f)	8	椭圆面	2CW2CC	1CW

Fig. 7 Detailed structure of different cases

Fig. 8 Process variables of case 1, 2, 3

Fig. 9 Reaction rate of case 1, 2, 3

Fig. 10 Axial velocity of case 1, 2, 3

Fig. 11 Wall adiabatic static temperature

Fig. 12 Static temperature 1 800 K iso-surface of case 2, 3

Fig. 13 Process variables of case 3, 4, 5

Fig. 14 Reaction rate of case 3, 4, 5

Fig. 15 Axial velocity of case 3, 4, 5

Fig. 16 Static temperature 1 800 K iso-surface of

Fig. 17 Iso-surface with static temperature of 1 800 K (red) and axial velocity of -5 m/s (gray)

Fig. 18 Variation of reaction rate with axial distance

Fig. 19 Variation of static pressure with axial distance

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