Fig.1

Schematic diagram of hydrogen micromix combustor

Fig.2

Flow principle of hydrogen micromix combustor

Fig.3

Geometric size of honeycomb micromix element with bluff body

Fig.4

Schematic diagram of symmetric and periodic surface

Fig.5

Numerical grid independence verification

Fig.6

Comparison of mass fraction of NO with Cranfield University at center surface

Fig.7

Iso-surfaces of Ω=0.52 with no H2 injection

Fig.8

3D streamtraces with no H2 injection

Fig.9

u/u0 distribution at cross sections and streamlines with no H2 injection

Fig.10

Comparison of axial velocity and streamlines between cold and hot conditions at Δz=0 mm cross section

Fig.11

Comparison of axial velocity and streamlines between cold and hot conditions at Δz=5 mm cross section

Fig.12

Injection depth at Δz=5 mm cross section and momentum flux ratio at different equivalence ratios

Fig.13

Comparison of axial velocity and streamlines at Δz=5 mm cross section

Fig.14

Comparison of axial velocity and streamlines between cold and hot conditions at center section

Fig.15

Comparison of 3D vortex between cold and hot conditions

Fig.16

Comparison of vorticity between non-jet， cold， and hot conditions

Fig.17

Comparison of axial velocity between non-jet， cold， and hot conditions

Fig.18

Comparison of axial velocity non-uniformity between non-jet， cold， and hot conditions

Fig.19

Comparison of axial vorticity between cold and hot conditions

Fig.20

Mass fraction of OH distribution for baseline at x=0 mm section

Fig.21

Temperature distribution for baseline at x=0 mm section

Fig.22

NO mass fraction distribution for baseline at x=0 mm section

Fig.23

Design optimization framework

Fig.24

Effect ofbluff body angle θ and height HBB on NO x emissions

Fig.25

Three-dimensional surfaces of influences of HBB and θ on NOx emission

Fig.26

Comparison of vorticity at cross sections for baseline and optimum case

Fig.27

Comparison of temperature at cross sections for baseline and optimum case

Fig.28

Comparison of temperature distribution at cross sections for baseline and optimum case

Fig.29

Comparison of NO x at cross sections for baseline and optimum case