Combustion control using a lobed swirl injector and a plasma swirler

Li, Gang; Jiang, Xi; Zhu, Jihong; Yang, Jinhu; Liu, Cunxi; Mu, Yao; Xu, Gang

doi:10.1016/j.applthermaleng.2019.02.042

Cited by 17 publications

(12 citation statements)

References 27 publications

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“…Focus of the study was then made on investigating the dynamics of this lifted flame. Compared to the premixed flame investigated in our previous work, 1 the partially premixed lifted flame of this lobed swirl injector has no risk of flashback and exhibits a higher flame stability. Compared to a pure diffusion flame, the lifted flame increases the fuel/air mixing time and enhances the uniformity of the reactant mixture, which helps to reduce the flame peak temperature and restrain NO x emissions.…”

Section: Combustion Dynamics and Flame Behaviormentioning

confidence: 64%

“…However, very few studies have been carried out in terms of the application of lobed swirl injector in combustion control. Although our previous work 1 showed that the lobed swirl injector has a potential in combustion control of premixed flames in practical devices, which can also be assisted by plasma actuators, 18 the range of flame stabilization was limited. In addition, as an intrinsic characteristic of premixed combustion, the risk of flashback and auto-ignition remains.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of non-premixed and partially premixed methane lifted flames established on a lobed swirl injector

Jiang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part A:

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A lobed swirl injector was tested to examine its potential in combustion control for non-premixed and partially premixed flames. It was found in the experiment that the flame derived from the injector changed between attached and detached flames at different conditions, demonstrating a promising way to control combustion. When air is supplied through the external channel of the lobed swirl injector and fuel passes through the internal channel, a stable lifted flame that is partially premixed was established above the injector exit. With the increase of airflow rate, the flame lift-off height decreases gradually until it is reattached to the injector, forming a diffusion flame. When increasing the fuel flow rate, the lift-off height increases gradually until the flame is blown out. Flow fields of the partially premixed lifted flames were investigated using stereoscopic particle image velocimetry. Streamlines located in the near field of the injector exit do not expand but bend inward, which is quite different from the expansion motion at the exit of the traditional vane swirler. The trough structure on the lobed swirler leads to the outer air flowing inward. Although the crest structure should make the inside gas flow outward, the strong entrainment of the surrounding air would restrain the radial outward motion of the inner gas, thus causing a contracted motion. After the streamline develops to an axial position further away from the injector exit, the swirling jet begins to expand under effects of both the centrifugal force and the development of shear layer to form turbulence. This flow pattern affects both the flame stabilization position and the neighboring reaction zone structure significantly. The measurements also show that the lobed swirl injector is very capable of entraining the ambient air that is sucked into the mainstream from the downward direction.

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Section: Combustion Dynamics and Flame Behaviormentioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Experimental investigation of non-premixed and partially premixed methane lifted flames established on a lobed swirl injector

Jiang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…In Fig. 5, the minimum velocity on the axial velocity profile corresponds to the velocity normal to the flame front and provides a means to determine the turbulent flame speed 28 . For those four profiles, the local turbulent flame speed is about 0.65 m/s and the corresponding velocity fluctuation is about 0.33 m/s.…”

Section: Resultsmentioning

confidence: 99%

“…1. The same experimental setup as that in our previous studies 28,29 has been used. Air is supplied by a screw air compressor then stabilized in two tanks of 1.2 cubic meter.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Flame stability under lean burn conditions is becoming increasingly important because of the needs to mitigate combustion pollutant emissions. Previous experiments show that the plasma swirler is effective in controlling the non-swirling jet flow and flame 26,27 and the lift-off height of the flame 28,29 , but its mechanism is not very clear. Effects of active particles, heat release and aerodynamics are coupled together in the plasma combustion control.…”

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confidence: 99%

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Central recirculation zone induced by the DBD plasma actuation

Jiang

Lei

et al. 2020

Sci Rep

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Central recirculation zone (CRZ) is commonly formed in the near field of the injector exit by the vane swirler and used to stabilize the flame. In our experiment, a CRZ induced by the DBD plasma actuation was observed in the low swirl burner configuration for the first time, which clearly demonstrated that the mechanism of the combustion control by the plasma swirler is mainly through the aerodynamic effect. Three dielectric barrier discharge (DBD) actuators are placed in a circular array around the axis to generate ionic wind in the circumferential direction of the injector. Characteristics of the flow field have been measured using Laser Doppler Anemometry. It is found that a central recirculation zone with the shape of an ellipsoid is formed in the non-reacting flow field with the plasma actuation. The position of the upstream stagnation point was determined by the strength of the actuation. Although the CRZ disappears in the reacting flow field as the result of combustion heat release, the influence of the discharge on the flame lift-off height is noticeable. The results demonstrate that swirl enhancement by the plasma swirler is feasible, flexible and effective as a non-intrusive measure for flow control.

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Experimental Investigation of Flame Dynamics Based on High-Speed Images in Swirl Combustion Systems

Zhao

et al. 2022

J. Therm. Sci.

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Combustion control using a lobed swirl injector and a plasma swirler

Cited by 17 publications

References 27 publications

Experimental investigation of non-premixed and partially premixed methane lifted flames established on a lobed swirl injector

Experimental investigation of non-premixed and partially premixed methane lifted flames established on a lobed swirl injector

Central recirculation zone induced by the DBD plasma actuation

Experimental Investigation of Flame Dynamics Based on High-Speed Images in Swirl Combustion Systems

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