Flow field and combustion characteristics of integrated combustion mode using cavity with low flow resistance for gas turbine engines

Zhang, Rongchun; Bai, Ning; Fan, Weijun; Yan, Wenhui; Hao, Fei; Yin, C.M.

doi:10.1016/j.energy.2018.09.121

Cited by 25 publications

(3 citation statements)

References 16 publications

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“…Meanwhile, the turbulence intensity at the shear layer of the jets and recirculation zones can characterize the level of mixing between fresh premixed gas and burned gas [25]. At present, the effects of vortex and turbulence fluctuation on combustion performance, especially on pollutant emissions, are mainly concentrated in the field of trapped vortex combustion chambers [26][27][28]. Jin et al studied the trapped vortex combustion and found that the turbulent fluctuation is strongest near the inner and outer boundaries of large-scale vortices, leading to the strongest mixing in this area, which can effectively improve combustion efficiency and reduce emissions [29].…”

Section: Introductionmentioning

confidence: 99%

The Effects of Strong-Weak Swirling Interaction on Emissions in a Multi-Nozzle Combustor

Jin

Shi

et al. 2023

Preprint

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Strong-weak swirling interaction has been proved to be effective on combustion instability suppression. A linearly three-nozzle rectangular model combustor is designed to investigate the effects of strong-weak swirling interaction on emissions. Swirl number of swirlers on both sides are 0.72 and that of the middle swirlers are 0.72 and 1.02, respectively. Fuel flow rate remains constant and the equivalence ratio varies from 0.53 to 0.83 by decreasing the air flow rate. High-speed particle imaging velocimetry (HPIV) and RANS methods are applied to study the flow characteristics to reveal the reasons for reduction of pollutants. Results indicate that the "strong-weak" swirling interaction between central and outer swirlers strengthens the turbulence intensity of the swirling flow shear layers, which effectively improve mixing process between fresh premixed gas and burned high-temperature gas to promote combustion characteristics. CO emission varies from 20 to 40 ppm under different equivalence ratios in equal-strength swirl combustor. However, CO emission reduces to below 4 ppm with "strong-weak" swirling interaction. With the increase of swirl number of central swirler, NOx emission remains basically unchanged under the same equivalence ratio. The "strong-weak" swirling interaction also raises the vorticity of main recirculation zone, which strengthens the roll of high-temperature burned gas into the recirculation zone to stabilize flame combustion and widen the operating conditions. In this paper, the equal-strength swirling interaction is converted into a "strong-weak" swirling interaction by increasing the swirling number of central swirler, which helps achieve stable, high-efficiency, low-emission combustion.

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Section: Introductionmentioning

confidence: 99%

The Effects of Strong-Weak Swirling Interaction on Emissions in a Multi-Nozzle Combustor

Jin

Shi

et al. 2023

Preprint

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“…Therefore, investigations of the reacting flow field are necessary. Researchers have mainly used simulations or other experimental methods to investigate the influence of combustion on the flow field [21][22][23][24][25][26][27][28]. For instance, it showed that the reacting flow field could be predicted for perfectly premixed and partially premixed conditions using Large-Eddy Simulation (LES), and a good overall agreement was found between with the experimental and simulation data [21].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Flow Characteristics of a Reverse-Flow Combustor

et al. 2022

International Journal of Aerospace Engineering

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Reverse-flow combustor is widely used for small engines to overcome high speed shaft whirling problem and to provide a low frontal area. An experimental investigation was carried out to research the flow field characteristics of a reverse-flow combustor in this paper. Different aerodynamic conditions were studied using PIV to reveal the characteristics of both the nonreacting and reacting flow fields. The structure of the nonreacting flow field in the central section shows similarity as the total pressure loss coefficient increases. The penetrating depth, jet angle, recirculation zone position, and the flow streamlines are similar, while the velocity value of the flow field increases. The structure of the reacting flow field on the central section is different from that of nonreacting flow field, but the variation trend of the reacting flow field under different pressure loss coefficient is similar to that of the nonreacting flow field. By examining the nonreacting and reacting flow fields under the same total pressure loss conditions, marked differences were observed in the primary zone close to the swirler outlet. The relative motion between fuel injection, airflow, and combustion affects the flow field in this zone. The velocity with combustion is faster than that of the nonreacting flow because of the increased temperature and heat release.

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“…The cavity flameholder is based on the mechanism of the trapped vortex and is more appropriate for high-speed conditions [17]. However, since the operation mode of cavity flameholder is fundamentally different from that of conventional structures, it still needs further research and exploration if widely used [18,19].…”

Section: Introductionmentioning

confidence: 99%

Effects of Bypass Flow Distribution on Cold Flow Characteristics of Integrated Afterburner

et al. 2021

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Integrated design is a trend in the development of afterburners, and the distribution of cold flow is directly related to their flow field characteristics, combustion organization, and the cooling effect of components. Numerical simulations were performed to illustrate the effects of bypass flow distribution on the flow distribution, mixing characteristics, and cooling efficiency of the components by varying the cooling flow path structure parameters. Within the range of parameters in this study, it can be indicated that with the increase of heat shield inlet height and afterburner annulus height, the total pressure recovery coefficient along the path increased accordingly, and the increasing rate at the afterburner outlet is 1.12% and 1.19%, respectively. The average cooling efficiency of radial flameholder, circumferential flameholder, and fuel injector all decrease, but the rate of decrease varies slightly depending on the location of the components. The increase of heat shield inlet height would reduce thermal mixing efficiency by approximately 5.4% at the afterburner outlet, and the increase of afterburner annular height would increase about 2.9%.

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Flow field and combustion characteristics of integrated combustion mode using cavity with low flow resistance for gas turbine engines

Cited by 25 publications

References 16 publications

The Effects of Strong-Weak Swirling Interaction on Emissions in a Multi-Nozzle Combustor

The Effects of Strong-Weak Swirling Interaction on Emissions in a Multi-Nozzle Combustor

Experimental Investigation on Flow Characteristics of a Reverse-Flow Combustor

Effects of Bypass Flow Distribution on Cold Flow Characteristics of Integrated Afterburner

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