Criterion analysis and experimental study of combustion mechanisms in a bidirectional swirling flow and their relationship with pollutants emission

Abstract

Summary This paper reports on the theoretical and experimental studies of combustion in a bidirectional swirling flow to develop its criterion base. Based on considering known aero‐thermochemical similarity criteria, turbulent combustion numbers were calculated for the bidirectional vortex combustor for the first time. Theoretical assessment and experimental studies of the probability of the known combustion mechanisms' implementation in a limited bidirectional swirling flow, containing the secondary flows and separation phenomena, were performed. This gave us a possibility to provide the new correlation of combustion mechanisms with emission dependencies. A joint review of these data allowed us to establish that the greatest environmental efficiency is observed in the range of the air‐fuel equivalence ratio of 1.5 < λ < 1.9. At the same time, it was defined that stable combustion of liquid fuel in the bidirectional swirling flow is available up to the value λ = 22. Moreover, criterion equations for lean and rich limits of stable combustion were obtained.

Investigation of the parameters influence of the oxy-fuel burner and the test bench parameters on the deviation of the model similarity criterions from the full-scale values

“…The following are conventionally taken as the main criteria that determine the conditions for mixing components, their movement through the combustion chamber and flame propagation [21] where 𝑝 is the pressure, Pa; 𝑝 is the density, kg/m 3 ; 𝑣 is the velocity, m/s…”

Investigation of turbulent flow in vortex cold-wall combustion chamber under different spark ignition times

“…Majdalani and Williams 9 explored the evolution of the cyclonic flow field, and obtained the flow characteristic parameters. Guryanov et al 10 experimentally studied the combustion characteristics of liquid fuel, the results show that lower pollutant emission is achieved at equivalence ratios between 1.5-1.9. Evdokimov et al 11 investigated the effect of flame and flow on pollutant emission, the results show that vortex cold-wall combustion reduces pollutant emission, enhances flame stability.…”