Effects of nozzle contraction angle on particle concentration characteristics and flow development in a confined jet reactor [喷嘴收缩角度对射流反应器内颗粒浓度分布及发展的影响]

作者：Ba Z.-R.; Zhao J.-T.^*; Nie W.; Hao Z.-H.; Yang Z.-T.; Fang Y.-T.

来源：Journal of Chemical Engineering of Chinese Universities, 2022, 36(6): 815-824.

DOI：10.3969/j.issn.1003-9015.2022.06.006

• gas-particle two-phase jet
• nozzle configuration
• particle concentration
• particle flux

In order to enhance particle dispersion and gas-particle mixing performances, the distribution and development characteristics of particle concentration were investigated within a jet reactor with different contraction angles. Effects of jet velocity and particle loading ratio on particle concentration distribution, mass flux, momentum and circulation were discussed. Due to the nozzle contraction effect, particles converged towards the jet axis and formed a local dense region. As the contraction angle increases, the local dense region moves towards upstream. The combing interactions of the recirculating entrainment and the wall effect resulted in a multi-staged distribution of particle concentration. The coalescence of particles in the jet axis and the accumulation of particles near the wall both decrease the uniformity distribution of particle concentration in the jet reactor. In the near field, particle mass and momentum fluxes mainly occur in the shear layer. The location of peak fluxes moves towards the wall with the shear layer development, and particle recirculation fluxes increase significantly near the wall.

• 单位
  中国科学院大学; 煤转化国家重点实验室