Comparative Study on the Combustion Performance in Localized Stratified and Rapidly Mixed Swirling Tubular Flame Burners

Ren, Shoujun; Jiang, Liqiao; Yang, Haolin; Zhao, Daiqing; Wang, Xiaohan

doi:10.1080/00102202.2019.1697692

Cited by 13 publications

(16 citation statements)

References 25 publications

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“…A detailed mechanism for methane 21 that contains the main species of CH 4 , O 2 , CH 3 , CH 2 , OH, CO, H 2 , CO 2 , and H 2 O is employed in this investigation. The calculation model has been verified in our previous works 16‐18 . The flow field, temperature distribution, and CH distribution are in good agreement with the experimental results.…”

Section: Experimental and Numerical Methodssupporting

confidence: 72%

“…The CFD results about the flow field have been verified in our previous works, 16‐18,25 showing high reliability. The calculated results of Da numbers are shown in Table 1.…”

Section: Discussionsupporting

confidence: 64%

“…The nonpremixed condition, such as LSVC, can provide a suitable equivalence ratio and greatly improve combustion stability, thereby making the blow‐out more difficult 15 . In the LSVC, the fuel and oxidant are injected in the same side tangential direction, which will form a nonuniform component distribution, thus yielding a large stability limit 16‐18 …”

Section: Introductionmentioning

confidence: 99%

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Stabilization performances and mechanisms of a diffusion‐like vortex‐tube combustor foroxygen‐enrichedcombustion

et al. 2020

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Summary The stabilization performance and mechanisms in a diffusion‐like vortex‐tube combustor is investigated for oxygen‐enriched combustion. The stability limit, flame configuration, and pressure fluctuation are investigated under various conditions. Results show that a diffusion‐like flame structure is established in the combustor and the nonpremixed peculiarity becomes more prominent with the increase of oxygen mole fraction. The steady combustion can be achieved in the range of global equivalence ratio 0.01 to 1.0 with a low‐pressure fluctuation amplitude always less than 1300 Pa, indicating a good combustion stability of this combustor. Additionally, the stabilization mechanism is discussed from the time matching and velocity matching. Based on the axial fuel entry method, the Damköhler number (Da) is always less than 1.0 as a whole, which is the principal reason for the tubular flame shape and the steady combustion procedure in this vortex‐tube combustor. The intensified combustion under oxygen‐enriched combustion can increase the flame speed, and subsequently reduce the mixing quality and make the yellow flame more visible. Besides, the temperature distribution and the flow field structure can explain the corrugation and deformation of the flame front under oxygen‐enriched conditions.

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Section: Experimental and Numerical Methodssupporting

confidence: 72%

“…The CFD results about the flow field have been verified in our previous works, 16‐18,25 showing high reliability. The calculated results of Da numbers are shown in Table 1.…”

Section: Discussionsupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

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Stabilization performances and mechanisms of a diffusion‐like vortex‐tube combustor foroxygen‐enrichedcombustion

et al. 2020

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“…In our previous works, the calculated results have been verified with the experiments from the flow field, temperature distribution, and species distribution. Good agreements were obtained and the adaptability of the calculation model was shown.…”

Section: Experimental and Numerical Methodssupporting

confidence: 58%

“…Meanwhile, the new flame structure in the LSVC plays a crucial role in the stabilization. Our previous work showed that the stability limit of global equivalence ratio can be decreased to 0.1 and the lower limit of flow velocity can be reduced to 3.0 m/s in the LSVC, which is significantly better than RMVC. However, the stabilization mechanism in the LSVC was not discussed systematically.…”

Section: Introductionmentioning

confidence: 96%

An exploration of stabilization mechanisms in a novel vortex‐tube combustor with localized stratified peculiarity

Ren

2020

Int J Energy Res

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Experimental and numerical (via ANSYS FLUENT) studies have been conducted on the combustion stability and stabilization mechanisms in a localized stratified vortex-tube combustor (LSVC) under lean conditions. The stability limit and flame configuration were obtained under different combustion conditions. Combined with the flow field distribution, the formation mechanisms of the local stratification of species and the resultant flame configuration were analyzed. Results show that the local stratification peculiarity is responsible for the dual flame appearance. On the basis of the local stratification of species, the local equivalence ratio is close to stoichiometry in the vicinity of the flame front, while it is above 1.0 in the interior, enabling the achievement of stable combustion at a global equivalence ratio as low as 0.12 in the LSVC. The flow field can help the transport of the reactive species and yields an intensified combustion and a large density gradient. The peak heat release rate (HRR) of 0.5 W/mm 3 in the LSVC is much higher than that of 0.1 W/mm 3 in the rapidly mixed vortex-tube combustor (RMVC) at the global equivalence ratio of 0.6 and the maximum tangential velocity of 26.44 m/s. The flame-vortex interaction theory provides a new perspective to interpret the rapid flame propagation in vortex-tube combustors. Based on the pressure jump theory, the flame speed was obtained via a specific formula closely related to the density gradient and the injection velocity. It turns out that the flame speed in the LSVC is remarkably higher than that in the RMVC at a certain same combustion condition. Moreover, the decrease of local flow velocity resulted from the strong swirl provides a favorable guarantee for the balance with the local flame speed. K E Y W O R D S localized stratification, stability limit, stabilization mechanism, vortex bursting, vortex-tube combustor

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Stabilization characteristics and mechanisms in a novel tubular flame burner with localized stratified property

Ren

Yang

Jiang

et al. 2020

Energy

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Comparative Study on the Combustion Performance in Localized Stratified and Rapidly Mixed Swirling Tubular Flame Burners

Cited by 13 publications

References 25 publications

Stabilization performances and mechanisms of a diffusion‐like vortex‐tube combustor foroxygen‐enrichedcombustion

Stabilization performances and mechanisms of a diffusion‐like vortex‐tube combustor foroxygen‐enrichedcombustion

An exploration of stabilization mechanisms in a novel vortex‐tube combustor with localized stratified peculiarity

Stabilization characteristics and mechanisms in a novel tubular flame burner with localized stratified property

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