Effect of vane angle on combustion characteristics of premixed H2/air in swirl micro-combustors with straight vane or twisted vane

Kim, Insong; Kim, Jongchol; Choe, Yongmin; Ryu, Kumsong; Cha, Jongchol; Ri, Jonghyok

doi:10.1016/j.applthermaleng.2023.120528

Cited by 11 publications

(4 citation statements)

References 76 publications

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“…In micro-and meso-scale combustion, there are many specific flame structures and configurations. One of them is the impinging diffusion flame, which is formed via the impingement of two streams in a microconfined space [24][25][26]. The flame thickness of this kind of structure is very small, which has been observed in a previous study [26], and can be approximately regarded as a two-dimensional slice shape.…”

Section: Introductionmentioning

confidence: 80%

“…One of them is the impinging diffusion flame, which is formed via the impingement of two streams in a microconfined space [24][25][26]. The flame thickness of this kind of structure is very small, which has been observed in a previous study [26], and can be approximately regarded as a two-dimensional slice shape. In the consideration of the unique characteristics of micro-and meso-scale combustion, it is necessary to develop a corresponding reconstruction model to measure the fields of temperature and soot concentration.…”

Section: Introductionmentioning

confidence: 80%

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Numerical and Experimental Reconstruction of Temperature Distribution and Soot Concentration Field for Thin-Slice Flames Using a Charge Coupled Device Camera

Chen,

et al. 2023

Fire

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This work proposed a novel model to simultaneously reconstruct temperature distribution and soot volume fraction field for two-dimensional thin-slice flames using the knowledge of monochromatic radiation intensities at two wavelengths using a CCD camera. The deduction process and numerical analysis of the model were described. Effects of wavelength combinations and measurement errors on reconstruction accuracy were considered in detail. Numerical results have proven the model’s accuracy and showed that the temperature and soot volume fraction fields can be reconstructed well even with noisy input data from flame radiation. In addition, a series of experiments were conducted on a mesoscale combustor to obtain the real thin-slice flames for further experimental reconstruction via the model. The experimental results indicated that the proposed model can successfully reconstruct the flame temperature distribution and soot volume fraction field and the main features of thin-slice flames also can be reasonably reproduced.

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Section: Introductionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 80%

Numerical and Experimental Reconstruction of Temperature Distribution and Soot Concentration Field for Thin-Slice Flames Using a Charge Coupled Device Camera

Chen,

et al. 2023

Fire

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“…Meanwhile, Wan et al 15 found that the introduction of a central rod expanded the blow-off limits. The central rod also stabilized the flame location and improved its stability as it is stressed by Wan et al 16,17 Kim et al 18 found that increasing the vane angle in swirl microcombustors, whether equipped with straight or twisted vanes, significantly enhances combustion stability, enlarges recirculation zones, improves wall temperature and heat transfer. Furthermore, the vane angle has a notable impact on combustion efficiency and pressure loss.…”

Section: Introductionmentioning

confidence: 88%

Numerical investigation of H2/Air fueled micro combustion characteristics with trapezoidal ribs for micro thermophotovoltaic applications: Effect of rib height

Lachraf,

Si Ameur

2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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In this numerical study, the impact of equidistant trapezoidal ribs on the characteristics of premixed H2-air micro-combustion was investigated, with a specific focus on the rib height. The study comprehensively examined flame structure, flame front position, flame speed, and combustion efficiency. A comparative analysis was performed between a backward-facing step micro combustor (MCSD) and micro combustors with varying rib heights: MCRD1 (0.5 mm), MCRD2 (0.6 mm), and MCRD3 (0.7 mm). The incorporation of trapezoidal ribs resulted in the creation of elongated and evenly distributed recirculation zones, significantly enhancing mixing and promoting flame stability, particularly at higher rib heights. The recirculation zones played a critical role in influencing the chemical reaction rate and the species distribution, leading to higher flame speed and greater combustion intensity. The findings highlight the outcomes of incorporating ribs in terms of combustion efficiency. The combustion efficiency values for MCRD1, MCRD2, and MCRD3 were recorded as 96.95%, 96.75%, and 96.61%, respectively, while the MCSD had a combustion efficiency of 97.14%. Hence, the recommended range of rib height is considered advantageous in ensuring an optimal balance between improved flame stabilization and maintaining a satisfactory level of combustion efficiency. The findings provide valuable insights for optimizing micro-thermophotovoltaic systems.

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“…Coupling a swirler to the chamber is one of the methods to increase the combustion stability, a swirler promotes the mixing of fuel and air by entraining high-temperature medium from the recirculation zone to the flame root, which facilitates combustion stability. [6][7][8] Kim et al 9 conducted numerical simulations to investigate the impact of straight and twisted blades with various blade angles, which influences the swirling, on the combustion performance in a hydrogen/air cyclonic combustion chamber. The results show that the temperature of the chamber outer wall surface fitted with straight blades increases by 47 K when the cyclone blade angle increases from 15°to 75°if the premixed gas inlet velocity is 40 m/s.…”

Section: Introductionmentioning

confidence: 99%

Analysis of vortex combustion flow in a chamber of guide ring coupling with swirl flow

Sun,

Zeng,

2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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To investigate the impact of different vortex structure on the combustion stability in a chamber, this paper evaluates the performance of a vortex combustion chamber coupled with a swirler and a guide ring. The simulated cases include different guide ring angles of 95°, 105°, 115°, 125° and 135°, in addition to a control case without coupling the guide ring. The distributions of velocity, vorticity, temperature, outlet temperature distribution factor ( OTDF), reaction rate, turbulent kinetic energy ( k), synergy angle ( β), and NO emission are numerically analyzed. Results show that the coupling of the swirler and guide ring changes the vortex structure and significantly influences the chamber performance. The increase of the guide ring angles ( α) enhances the interaction between the swirl flow and the direct jet, which intensifies heat and mass transfer, as well as turbulence. The application of the guide ring induces external entrainment of the jet, leading to the formation of a large central recirculation zone compared to that without a guide ring. With increasing the α from 95° to 135°, both average outlet velocity and tangential velocity ( Vt) at the coaxial line position decrease, while the flame length decreases by 286 mm. And the OTDF variation among all cases is less than 0.065. The β of the central section decreases from 76.18° to 70.17°. Furthermore, combustion chamber without the guide ring exhibits higher temperature and OTDF.

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Effect of vane angle on combustion characteristics of premixed H2/air in swirl micro-combustors with straight vane or twisted vane

Cited by 11 publications

References 76 publications

Numerical and Experimental Reconstruction of Temperature Distribution and Soot Concentration Field for Thin-Slice Flames Using a Charge Coupled Device Camera

Numerical and Experimental Reconstruction of Temperature Distribution and Soot Concentration Field for Thin-Slice Flames Using a Charge Coupled Device Camera

Numerical investigation of H2/Air fueled micro combustion characteristics with trapezoidal ribs for micro thermophotovoltaic applications: Effect of rib height

Analysis of vortex combustion flow in a chamber of guide ring coupling with swirl flow

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