Numerical Investigation of Hydrogen Combustion in a Chamber with Guide Ring and Double Jets

ABSTRACT

To investigate the turbulent flow in a combustor with double jets and guide ring, the simulated cases include different guide ring angles of 95°, 105°, 115°, 125° and 135°. The distributions of velocity, turbulent kinetic energy (k), temperature, flame stretch rate ($\mathit{\kappa }$), combustion efficiency($\mathit{\eta }$), synergy angle($\mathit{\beta }$), and NO emissions are analyzed. Results show that the guide ring influences the combustion performance, and the degree of impact increases with increasing the guide ring angle (α). The 95° guide ring has a relatively minor effect. However, when α ≥ 105°, increasing α promotes the mixing between the double jets and enhances k, temperature uniformity, synergy effects, $\mathit{\eta }$ and $\mathit{\kappa }$. During α from 95° to 135°, streamlines initially exhibit bending at the guide ring trailing edge, then inner recirculation zones (IRZ) appear. At the center section, average k/k₀ increases from 2.51 to 19.50, $\mathit{\beta }$ decreases from 77.59° to 71.97°, and $\mathit{\kappa }$ increases from 243.65 s⁻¹ to 555.47 s⁻¹. Compared to these without the guide ring, the values for the case with α = 135° are 8.82, 1.09 and 0.47 times, respectively.

KEYWORDS:

• Guide ring
• hydrogen
• emissions characteristics
• flow and flame interactions
• flame stretch rate

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was financially supported by Shanghai Science and Technology Project [21DZ1207203].