TY - JOUR
T1 - Effect of the swirl intensity on the non-reacting flowfields and fuel-air premixing characteristics for lean premixed combustors
AU - Sun, Fujun
AU - Suo, Jianqin
AU - Liu, Zhenxia
N1 - Publisher Copyright:
© 2022, The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature.
PY - 2022/1
Y1 - 2022/1
N2 - According to the tendency of incorporating fuel jet holes into swirler-vanes, as well as the advantages of wide operating boundary conditions and low NOx emissions of low swirl injectors for land-based gas turbines, an original lean premixed injector with convergent outlet was proposed in this paper. Based on the lean premixed injector, this paper presented laser diagnostic experiments and numerical simulations of flowfields and fuel/air premixing uniformities of S30 and S40. The results show that the axial size and the radial size of main recirculation zone (MRZ) of S30 are both smaller than those of S40, which can decrease residence time and is beneficial to NOx reduction for S30. Furthermore, the MRZ of S30 are far from the convergent outlet, which can produce detached flames and reduce the risk of flashback. The SMV at S40 and S30 convergent outlet are 0.0008 and 0.0002, respectively, both of which are lower than 0.001, which shows that both S30 and S40 obtain good fuel/air premixing uniformities. These results demonstrate that S30 (low swirl injectors) constitutes a promising technology for low emission gas turbine combustors.
AB - According to the tendency of incorporating fuel jet holes into swirler-vanes, as well as the advantages of wide operating boundary conditions and low NOx emissions of low swirl injectors for land-based gas turbines, an original lean premixed injector with convergent outlet was proposed in this paper. Based on the lean premixed injector, this paper presented laser diagnostic experiments and numerical simulations of flowfields and fuel/air premixing uniformities of S30 and S40. The results show that the axial size and the radial size of main recirculation zone (MRZ) of S30 are both smaller than those of S40, which can decrease residence time and is beneficial to NOx reduction for S30. Furthermore, the MRZ of S30 are far from the convergent outlet, which can produce detached flames and reduce the risk of flashback. The SMV at S40 and S30 convergent outlet are 0.0008 and 0.0002, respectively, both of which are lower than 0.001, which shows that both S30 and S40 obtain good fuel/air premixing uniformities. These results demonstrate that S30 (low swirl injectors) constitutes a promising technology for low emission gas turbine combustors.
KW - Fuel-air premixing
KW - Gas turbine combustor
KW - Lean premixed combustion
KW - Non-reacting flowfields
KW - Spatial mixture variance
UR - http://www.scopus.com/inward/record.url?scp=85122670351&partnerID=8YFLogxK
U2 - 10.1007/s12206-021-1241-5
DO - 10.1007/s12206-021-1241-5
M3 - 文章
AN - SCOPUS:85122670351
SN - 1738-494X
VL - 36
SP - 433
EP - 444
JO - Journal of Mechanical Science and Technology
JF - Journal of Mechanical Science and Technology
IS - 1
ER -