Effects of blade angle on combustion characteristics in a micro combustor with a swirler of micro fan type

Kim, Won Hyun; Park, Tae Seon

doi:10.1007/s42791-019-0002-4

Cited by 6 publications

(3 citation statements)

References 11 publications

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“…Numerous methods have been proposed to achieve combined flame stabilization and heat recirculation in micro combustors, including the use of backward-facing step, central rod, porous media flows, wall cavities, bluff body, swirl, orthotropic wall, and catalyst [15,17,18,26,93,105,[110][111][112][113][114][115][116]. To evaluate the combustion performance, various studies have been conducted on these configurations at different velocities and equivalence ratios.…”

Section: Sadatakhavi Et Al Conducted Experimental and Numerical Inves...mentioning

confidence: 99%

A Review on Flame Stabilization Technologies for UAV Engine Micro-Meso Scale Combustors: Progress and Challenges

Velidi

Yoo

2023

Energies

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Unmanned aerial vehicles (UAV)s have unique requirements that demand engines with high power-to-weight ratios, fuel efficiency, and reliability. As such, combustion engines used in UAVs are specialized to meet these requirements. There are several types of combustion engines used in UAVs, including reciprocating engines, turbine engines, and Wankel engines. Recent advancements in engine design, such as the use of ceramic materials and microscale combustion, have the potential to enhance engine performance and durability. This article explores the potential use of combustion-based engines, particularly microjet engines, as an alternative to electrically powered unmanned aerial vehicle (UAV) systems. It provides a review of recent developments in UAV engines and micro combustors, as well as studies on flame stabilization techniques aimed at enhancing engine performance. Heat recirculation methods have been proposed to minimize heat loss to the combustor walls. It has been demonstrated that employing both bluff-body stabilization and heat recirculation methods in narrow channels can significantly improve combustion efficiency. The combination of flame stabilization and heat recirculation methods has been observed to significantly improve the performance of micro and mesoscale combustors. As a result, these technologies hold great promise for enhancing the performance of UAV engines.

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Section: Sadatakhavi Et Al Conducted Experimental and Numerical Inves...mentioning

confidence: 99%

A Review on Flame Stabilization Technologies for UAV Engine Micro-Meso Scale Combustors: Progress and Challenges

Velidi

Yoo

2023

Energies

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“…Moreover, thermal performance is improved by premixed mode at low hydrogen/air equivalence ratios. Kim et al [18] investigated the effects of blade angle in a swirler of micro fan type on combustion characteristics of a micro combustor numerically. They found out that the swirling flows can influence noticeably the wall heat fluxes and the maximum heat loss occurs at 15 vane angle swirler.…”

Section: Introductionmentioning

confidence: 99%

Effects of coaxial airflow swirl number on combustion and flame characteristics of methane/air and n-butane/air flames in a miniature-scale swirl burner

Sheykhbaglou¹,

Robati²

2022

Eng. Res. Express

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In this paper, the effects of coaxial airflow swirl number on blow-out limit, flame characteristics, and emission performance of non-premixed methane/air and n-butane/air flames in a miniature-scale swirl burner are investigated experimentally. Swirl numbers ranging from 0 to 0.72 have been chosen to be examined. It was observed that increasing the vane angle does not increase the blow-out limit monotonically and a swirler with 30° vane angle (0.50 swirl number) results in the greatest blow-out limit. Besides, it was found out that methane outperforms n-butane in the blow-out limit at the same fuel flow rates. The intermittency distribution approach was used to determine flame properties such as lift-off height, length, and width. It was found that the lift-off variation with coaxial airflow Reynolds number at the specified fuel flow rates yields an inverted V-shape for Sn ≥0.50. The tip of these plots indicates the airflow rate at which the swirl shows its influence, and after this point, the lift-off height begins to decrease. It was also observed that the airflow related to this point decreases with an increase in the swirl number at a certain fuel flow rate. Furthermore, the results revealed that at high airflow rates, the flame width rises as the swirl number increases. Also, raising the swirl number and airflow Reynolds number reduced the flame length. It was also observed that n-butane/air flames have longer and wider flames than methane/air flames. Additionally, adding swirl to the airflow rate typically reduces NOx and CO concentrations and n-butane/air flames exhibit lower levels of NOx and higher levels of CO than methane/air flames under the same operating conditions.

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“…Zhao et al 31 enhanced the thermal performance of the outer wall by designing an internal spiral fin in a cylindrical micro‐combustor. Kim and Park 32 introduce a swirler of micro‐fan type in a cylindrical combustor. Therefore, the swirling flow field is formed in the combustor to increase the residence time of fuel and strengthen the heat exchange so as to improve the thermal performance of the outer wall.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of combustion and radiation performances in a counterflow double‐channel combustor with pin fins for micro‐thermophotovoltaic system

Gao

Yan

Zhang

et al. 2021

Intl J of Energy Research

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Summary As one vital role component of micro‐thermophotovoltaic (MTPV) system, the combustion characteristics of the micro‐combustor directly affect the wall temperature distribution and the MTPV system efficiency. Combined with the advantages of counterflow and pin rib arrangement, a counterflow double‐channel micro‐combustor with pin fins (combustor C) was built to enhance the heat transfer and improve the wall temperature. The combustion performances and radiation performances of single‐channel micro‐combustor (combustor A), counterflow double‐channel micro‐combustor (combustor B), and combustor C were investigated and compared under different mass flow rates (4~12 × 10−5 kg/s) and equivalence ratios (0.6~1.4). Results show that the pin fin is of positive significance for the fixation of flame root to improve the combustion stability, combustion efficiency, and radiation energy when the total mass flow rate is high, especially. When the mass flow rate is low, the combustion efficiency of combustor C is the lowest due to the limitation of combustion space. However, with the increase of the mass flow rate, the combustion characteristics of combustor C are the best due to the flame front area is larger among the three combustors and the flame root position is closer to the inlet area. The radiation energy, radiation efficiency, and mean temperature of the upper wall of the combustor C are significantly higher than other combustors under the same conditions. When the total mass flow rate is 12 × 10−5 kg/s, the radiation energy of combustor C is 0.51 times and 0.36 times that of combustor A and B, respectively. When the equivalence ratio is 1.0, the mean upper wall temperature of combustor C is 175.87 and 128.904 K higher than of combustor A and B, respectively. The counterflow double‐channels combustors have better wall temperature uniformity than single‐channel combustor under a wide range of working conditions.

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Effects of blade angle on combustion characteristics in a micro combustor with a swirler of micro fan type

Cited by 6 publications

References 11 publications

A Review on Flame Stabilization Technologies for UAV Engine Micro-Meso Scale Combustors: Progress and Challenges

A Review on Flame Stabilization Technologies for UAV Engine Micro-Meso Scale Combustors: Progress and Challenges

Effects of coaxial airflow swirl number on combustion and flame characteristics of methane/air and n-butane/air flames in a miniature-scale swirl burner

Enhancement of combustion and radiation performances in a counterflow double‐channel combustor with pin fins for micro‐thermophotovoltaic system

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