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Journal articles on the topic 'Combustion ratio'

Author: Grafiati

Published: 28 June 2021

Last updated: 29 July 2025

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1

Najib Aminu Ismail, Mazlan Abdul Wahid, Aminuddin Sa'at, Abubakar Shitu, and Mohammed Bashir Abdulrahman. "Effect of Recirculation Ratio on the Combustion Characteristics of an Asymmetric Swirling Flameless Combustor using Biogas." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 108, no. 1 (2023): 52–65. http://dx.doi.org/10.37934/arfmts.108.1.5265.

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This study investigates the influence of recirculation ratio on the combustion characteristics of an asymmetric swirling flameless combustor. The recirculation ratio, defined as the ratio of the total recirculation mass flow rate to the primary air mass flow rate, plays a crucial role in determining the performance and emission characteristics of combustion systems. The asymmetric swirling flameless combustor offers potential advantages in terms of enhanced fuel flexibility, reduced pollutant emissions, and improved combustion stability. Through varying the recirculation ratio, the combustion

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2

Cheng, Zhe, Wen Jun Wang, Wen Qing Shen, Ai Wu Fan, and Wei Liu. "Flame Stability of Methane/Air Mixture in a Heat-Recirculating-Type Mesoscale Channel with a Bluff-Body." Applied Mechanics and Materials 325-326 (June 2013): 12–15. http://dx.doi.org/10.4028/www.scientific.net/amm.325-326.12.

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To extend the stable combustion range of micro-combustor, a heat-recirculating-type planar micro-combustor fitted with a bluff-body was proposed in the present work. Numerical simulation on CH4/air premixed combustion in this combustor was performed and the stable combustion range was determined, which showed that the blow-off limit increases with the equivalence ratio and the lower flammability limit was extended. Effect of the equivalence ratio and inlet velocity on combustion efficiency and maximum temperature were investigated. The numerical results showed that combustion efficiencies were

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3

Cao, H. L., J. N. Zhao, K. Zhang, D. B. Wang, and X. L. Wei. "Diffusion Combustion Characteristics of H₂/Air in the Micro Porous Media Combustor." Advanced Materials Research 455-456 (January 2012): 413–18. http://dx.doi.org/10.4028/www.scientific.net/amr.455-456.413.

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In order to improve thermal to-electric energy conversion efficiency of the micro gas turbine power generation system, a novel micro porous media combustor is designed and experimental investigation on the H2/air diffusion combustion is performed to obtain its combustion characteristics. High efficiency diffusion combustion of H2/air can be stabilized in the very wide operating range, especially at higher excess air ratio. Exhaust gas temperature is markedly improved and meanwhile heat loss ratio is evidently decreased. Moreover, in the certain operating ranges, the greater the combustion ther

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4

Li, Shou-Zhe, Yu-Long Niu, Shu-Li Cao, Jiao Zhang, Jialiang Zhang, and Xuechen Li. "The effect of plasma discharge on methane diffusion combustion in air assisted by an atmospheric pressure microwave plasma torch." Journal of Physics D: Applied Physics 55, no. 23 (2022): 235203. http://dx.doi.org/10.1088/1361-6463/ac50cb.

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Abstract An atmospheric pressure air microwave plasma torch is employed to assist methane diffusion combustions using a combination of a combustor and burner. Experimentally, the effect of the air microwave plasma on combustion is investigated with respect to the flame morphology and the variation of gas components in the exhaust with the fuel equivalence ratio φ or the methane flow rate by comparing plasma-assisted combustion (PAC) and natural combustion (NC) without plasma application. The combustion degree of CH4 in PACs is found to be much enhanced in rich fuel combustion than in NC in bot

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5

Wakabayashi, T., S. Ito, S. Koga, et al. "Performance of a Dry Low-NOx Gas Turbine Combustor Designed With a New Fuel Supply Concept." Journal of Engineering for Gas Turbines and Power 124, no. 4 (2002): 771–75. http://dx.doi.org/10.1115/1.1473154.

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This paper describes the performance of a dry low-NOx gas turbine combustor designed with a new fuel supply concept. This concept uses automatic fuel distribution achieved by an interaction between the fuel jet and the airflow. At high loads, most of the fuel is supplied to the lean premixed combustion region for low-NOx, while at low loads, it is supplied to the pilot combustion region for stable combustion. A numerical simulation was carried out to estimate the equivalence ratio in the fuel supply unit. Next, through the pressurized combustion experiments on the combustor with this fuel supp

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6

Chun, Young Nam, and June An. "Development of Cavity Matrix Combustor for Biogas Application." ASEAN Journal of Chemical Engineering 22, no. 2 (2022): 306. http://dx.doi.org/10.22146/ajche.76154.

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The use of conventional fossil fuels has limitations in energy resources and environmental problems such as greenhouse gas, air pollution, etc. Biogas has sustainable and renewable characteristics that can be used as an alternative energy source to alleviate these problems. In this study, we proposed a novel cavity matrix combustor that directly enables the combustion of what is produced in small and medium-sized biogas facilities without separation or purification. We also identified combustion characteristics for changes in air ratio, gas feed rate, biogas ratio, and exhaust gas recirculatio

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7

Liao, Yunzhe, Chenghua Zhang, Yanrong Chen, and Yunfei Yan. "Combustion Performance of Methane/Air in a Micro Combustor Embedded Hollow Hemispherical Slotted Bluff Body." Energies 15, no. 11 (2022): 4033. http://dx.doi.org/10.3390/en15114033.

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With the rapid development of micro-energy power systems, the performance of micro-combustors as key components is in urgent need of further improvement. Aimed at enhancing combustion performance, a hollow hemispherical bluff body was used to analyze the methane combustion process. In this paper, we exploited the detailed reaction mechanism of methane/air with a laminar finite-rate model; the numerical analysis of methane combustion in the micro-combustor was carried out by Ansys Fluent software. The combustion, flow and thermal characteristics of the micro-combustor embedded with a hollow hem

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8

Wang, Taiyu, Zhenguo Wang, Zun Cai, et al. "Effects of combustor geometry on the combustion process of an RBCC combustor in high-speed ejector mode." Modern Physics Letters B 33, no. 27 (2019): 1950330. http://dx.doi.org/10.1142/s0217984919503305.

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The combustion characteristics of high-speed ejector mode in a 2-dimensional strut-based RBCC (rocket-based combined cycle) combustor had been investigated numerically in a Mach 2.5 supersonic flow. The numerical approach had been validated by comparing numerical results with available experimental data. Besides, three different hydrogen-air chemical reaction mechanisms had also been compared. The effect of the combustor geometry on the combustion process was then discussed by analyzing the heat release distribution and flow field. It was found that the wall configuration, closeout angle of th

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9

Du, Zhibin, Chao Chen, and Lei Wang. "Combustion characteristics of and bench test on “gasoline + alternative fuel”." Thermal Science, no. 00 (2020): 324. http://dx.doi.org/10.2298/tsci200704324d.

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In this study, an evaporative premixed constant-volume combustion system was designed for combustion of liquid fuels, compared with a traditional constant-volume firebomb. The effects of an alternative fuel of gasoline on the combustion characteristics of the laminar flame of gasoline were analyzed, and then a bench test was carried out. The results show that the addition of an alternative fuel of gasoline makes the maximum non-stretched flame propagation velocity of combusting gasoline increasingly close to that of combusting diluted mixed gas. The Markstein lengths of gasoline and ?gasoline

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10

Colantonio, R. O. "The Applicability of Jet-Shear-Layer Mixing and Effervescent Atomization for Low-NOx Combustors." Journal of Engineering for Gas Turbines and Power 120, no. 1 (1998): 17–23. http://dx.doi.org/10.1115/1.2818073.

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An investigation has been conducted to develop appropriate technologies for a low-NOx, liquid-fueled combustor. The combustor incorporates an effervescent atomizer used to inject fuel into a premixing duct. Only a fraction of the combustion air is used in the premixing process. This fuel-rich mixture is introduced into the remaining combustion air by a rapid jet-shear-layer mixing process involving radial fuel–air jets impinging on axial air jets in the primary combustion zone. Computational modeling was used as a tool to facilitate a parametric analysis appropriate to the design of an optimum

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11

Satworo, Adiwidodo, Nyoman Gede Wardana I, Yuliati Lilis, and Nur Sasongko Mega. "PERFORMANCE OF CYLINDRICAL AND PLANAR MESOSCALE COMBUSTOR WITH DOUBLE NARROW SLIT FLAME HOLDER FOR MICROPOWER GENERATOR." Eastern-European Journal of Enterprise Technologies 2, no. 8 (104) (2020): 35–43. https://doi.org/10.15587/1729-4061.2020.198570.

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This research compared the performance of a cylindrical mesoscale combustor against two planar mesoscale combustors, which include the shape of the flame front, temperature of the combustor axis and the combustor wall, and the resulting flammability limit. The combustor used has a circular, square and rectangular cross-section. All three combustors have the same cross-section area and combustion chamber volume. The flame holder used is a double narrow slit. The fuel used is liquefied petroleum gas with a pure oxygen oxidizer. The experiment results showed that the cylindrical combustor produce

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12

Guo, Bin, Mitsuhisa Ichiyanagi, Makoto Horie, et al. "Combustion Analysis of Ammonia/Oxygen Mixtures at Various Equivalence Ratio Conditions Using a Constant Volume Combustor with Sub-chamber." Automotive Experiences 4, no. 3 (2021): 161–70. https://doi.org/10.31603/ae.6132.

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The greenhouse effect issue is becoming more serious, and renewable energy is playing an increasingly important role. Among all alternative fuels, ammonia has been attracting attention as a carbon-free energy carrier for hydrogen, because of its large energy density per volume and easy storage and transportation. On the other hand, ammonia has a low combustion speed, which is an important issue for the use of ammonia as a vehicle fuel. To increase the mean flame speed of ammonia, the present study used the burned gas ejected from the sub-chamber for the compression of the mixture in the main c

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13

Chein, Reiyu, Yen-Cho Chen, Jui-Yu Chen, and J. N. Chung. "Premixed Methanol–Air Combustion Characteristics in a Mini-scale Catalytic Combustor." International Journal of Chemical Reactor Engineering 14, no. 1 (2016): 383–93. http://dx.doi.org/10.1515/ijcre-2014-0061.

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AbstractMethanol catalytic combustion in a mini-scale tubular quartz-made combustor is investigated in this study. An alumina sphere was employed as the support for the platinum catalyst. The experimental results showed that the combustion can be self-ignited at room temperature. Using the combustor wall temperature to characterize the combustor performance, it was found that the combustion temperature can reach a high value within a short time. The experimental results indicated that the combustor performance depends greatly on the fuel/air supply. A higher temperature can be obtained with a

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14

Jeong, Seung-Min, Hyung-Seok Han, Bu-Kyeng Sung, Wiedae Kim, and Jeong-Yeol Choi. "Reactive Flow Dynamics of Low-Frequency Instability in a Scramjet Combustor." Aerospace 10, no. 11 (2023): 932. http://dx.doi.org/10.3390/aerospace10110932.

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This study numerically investigated the combustion instability and characteristics of a laboratory-scale gaseous hydrogen-fueled scramjet combustor. For this purpose, a numerical simulation with an improved detached eddy simulation and a detailed hydrogen/oxygen reaction mechanism was performed. The numerical framework used high-resolution schemes with high-order accuracy to ensure high resolution and fidelity. A total of five fuel injection pressures were considered to characterize the combustion instability as a function of the equivalence ratio. A sampling time of up to 100 ms was considere

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15

Naeemi, Saeed, and Seyed Abdolmehdi Hashemi. "Numerical investigations on the liftoff velocity of H2-air premixed combustion in a micro-cylindrical combustor with gradually changed section area." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234, no. 17 (2020): 3497–508. http://dx.doi.org/10.1177/0954406220914925.

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Sustaining and stabilizing flames are crucial issues in micro-combustion. In some micro-electro-mechanical systems such as the micro-thermophotovoltaic system, the flame should be formed in the combustion chamber, not outside it (combustion without liftoff). So, study of the liftoff phenomenon is important and vital in these systems. The aim of this study is to evaluate effect of changing combustor section area on the critical liftoff velocity in a micro-cylindrical combustor. For this purpose, the critical liftoff velocities are numerically identified for four combustor configurations (conver

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16

Podlesniy, Dmitry, Eugene Polianczyk, Maxim Tsvetkov, Leonid Yanovsky, and Andrey Zaichenko. "The Combustion of Lean Ethanol–Air Mixtures in a Swiss-Roll Combustor." Processes 12, no. 12 (2024): 2690. http://dx.doi.org/10.3390/pr12122690.

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A novel meso-scale 3-channel 5-turn Swiss-roll type combustor was designed and tested. The non-catalytic combustion of lean ethanol–air mixtures was experimentally investigated in relation to the oxygen excess ratio (α), which varied from 1.5 to 7. Depending on the control parameters used, two distinct regimes of combustion were experimentally observed: one with a combustion zone within the central chamber and another with a combustion zone in the inflow channel. The combustion temperature was virtually independent of stoichiometry. For richer mixtures and lower flow rates, the combustion zone

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17

Cui, Jiashuo, Rongguo Yu, Huishe Wang, Yangen Wang, and Jingze Tong. "A Comparative Study of Methanol and Methane Combustion in a Gas Turbine Combustor." Energies 18, no. 7 (2025): 1765. https://doi.org/10.3390/en18071765.

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To investigate the combustion and emission characteristics of a 20 MW gas turbine combustor following fuel replacement, this study employs numerical simulations to systematically compare the combustion performance of methanol and methane. The focus is on the influence mechanism of the fuel distribution ratio on NOx emissions. As a preliminary numerical investigation, this study aims to provide theoretical guidance for subsequent experimental research, with the results serving to define measurement points in experimental design. It is found that the value of NOx emission from methanol combustio

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18

Zhou, Guoli, Tong Zhang, Chenfei Lou, et al. "The Combustion of Forest Humus Blended with Low-Rank Coal: Effects of Oxygen Ratio and Blending Ratio." Processes 11, no. 6 (2023): 1615. http://dx.doi.org/10.3390/pr11061615.

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In this study, the combustion characteristics of pine needles, pine needle humus, and the co-combustion of these two types of biomass with coal were compared. In addition, the optimization of the combustion performance of coal/humus was assisted through the following studies: (i) the combustion performance of coal/pine needle humus was studied under four different oxygen concentrations (N2, 10%O2/90%N2, 20%O2/80%N2, and 40%O2/60%N2); (ii) the synergistic effect between the humus and coal during combustion was also investigated by adjusting the blending ratio and oxygen content; (iii) the mecha

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19

Xi, Wenxiong, Hui Xu, Tianyang Dong, Zhiyong Lin, and Jian Liu. "Numerical Investigation of Combustion Mechanism with Multi-Position Injection in a Dual-Mode Combustor." Aerospace 10, no. 7 (2023): 656. http://dx.doi.org/10.3390/aerospace10070656.

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To improve the flame propagation, combustion stability, and uniformity of the temperature field, multi-position injection is applied in a dual-mode combustor by controlling heat release in different locations. Using the chemical reaction of the finite rate combustion model and the detailed reaction mechanism of hydrogen combustion as described by Jachimowski, the influence of different multi-position injection patterns in a dual-mode combustor is analyzed. The one-equation Large Eddy Simulation (LES) turbulence model was chosen to define the sublattice turbulent viscous terms in a three-dimens

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20

Kuang, Hui, Xianpu Zhong, Junhao Wei, Fei Xing, and Zhenyin Hai. "Research on Dynamic Temperature at Outlet of Centrally Staged Combustor Based on TDLAS Technology." Sensors 25, no. 7 (2025): 2256. https://doi.org/10.3390/s25072256.

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High-frequency oscillations occur in the centrally staged combustor during operation. To effectively suppress them, real-time monitoring of the combustor exit temperature is critical. However, traditional contact temperature measurement methods are inadequate for accurately capturing temperature variations in the turbulent flow field. Tunable Diode Laser Absorption Spectroscopy (TDLAS) with a high acquisition frequency is employed to measure the temperature of the centrally staged combustor, utilizing a non-contact sensing method. The influence of various combustion parameters on the uniformit

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21

Ozturk, Suat. "A Numerical Investigation on Emissions of Partially Premixed Shale Gas Combustion." International Journal of Heat and Technology 38, no. 3 (2020): 745–51. http://dx.doi.org/10.18280/ijht.380319.

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The adiabatic, turbulent, and partially premixed combustions of several shale gases and air in a co-axial type combustor are computationally examined under the effects of different equivalence ratios, inlet temperatures, flow rates, humidity ratios, pressure, oxid inlet temperatures and flow rates, and swirl velocities in this study. Shale gases are extracted from Barnette, New Albany, Fayetteville, and Haynesville areas of USA. ANSYS software is used for numerical calculations of combustion. Results show that the maximum NO emissions for Barnette, New Albany, Fayetteville, and Haynesville sha

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22

Xu, Shida, Feilong Song, Xin Chen, Hesong Zhang, Xingkui Yang, and Jianping Zhou. "Experimental Diagnosis on Combustion Characteristic of Shock Wave Focusing Initiation Engine." Entropy 24, no. 7 (2022): 1007. http://dx.doi.org/10.3390/e24071007.

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A shock wave focusing initiation engine was assembled and tested in an experimental program. The effective pyrolysis rate of the pre-combustor was evaluated over a range of supplementary fuel ratio in this paper. Results highlight two operational modes of the resonant cavity: (1) pulsating combustion mode, (2) stable combustion mode. The appearance of the two combustion modes is jointly affected by the flow and the structural characteristic value of the combustion chamber. This paper uses images, time-frequency analysis, and nonlinear time series analysis methods to identify and distinguish th

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23

Yuan, Yixiang, Qinghua Zeng, Jun Yao, Yongjun Zhang, Mengmeng Zhao, and Lu Zhao. "Improving Blowout Performance of the Conical Swirler Combustor by Employing Two Parts of Fuel at Low Operating Condition." Energies 14, no. 6 (2021): 1681. http://dx.doi.org/10.3390/en14061681.

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Aiming at the problem of the narrow combustion stability boundary, a conical swirler was designed and constructed based on the concept of fuel distribution. The blowout performance was studied at specified low operating conditions by a combination of experimental testing and numerical simulations. Research results indicate that the technique of the fuel distribution can enhance the combustion stability and widen the boundary of flameout within the range of testing conditions. The increase of the fuel distribution ratio improves the combustion stability but leads to an increase in NOx emission

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Sivasegaram, S., and J. H. Whitelaw. "Combustion Oscillations in Dump Combustors with a Constricted Exit." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 202, no. 3 (1988): 205–10. http://dx.doi.org/10.1243/pime_proc_1988_202_108_02.

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Combustion oscillations in axisymmetric dump combustors have been examined in terms of amplitude and frequency characteristics for two dump-plane area ratios and as a function of combustor length, exit constriction, diameter, flowrate, equivalence ratio and swirl. The flammability limits are similar to those previously determined in disc- and dump-stabilized flames without a constricted exit, but the stability limits are not. Rough combustion, characterized by radiated sound levels more than 12 dB above that in smooth combustion, was observed at equivalence ratios close to the flammability lim

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Kamarudin, Mohd Fathurrahman, Mohd Al-Hafiz Mohd Nawi, Azri Hariz Roslan, et al. "Effects of Heat Transfer on Combustion Characteristics in a Cylindrical Vortex Combustor." Journal of Advanced Research in Numerical Heat Transfer 27, no. 1 (2024): 120–31. https://doi.org/10.37934/arnht.27.1.120131.

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A vortex flows in micro/meso scale combustors for small-scale power generation play a crucial role in enhancing combustion efficiency and stability. They enhance mixing between fuel and air, promoting better combustion and help stabilize flames by maintaining consistent fuel-air ratios. The temperature are significantly impacts the reactant temperature due to heat conduction wall in Cylindrical Vortex Combustor (CVC). This phenomenon, known as preheating, occurs as the wall transfers heat to the reactants. ANSYS Fluent software is used for conducted a numerical investigation on a CVC. The comb

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Salih, Hussein M., and Adel H. Ayaal. "Enhancement of Methane-Air Combustion with Increasing Oxygen Ratio." International Journal of Heat and Technology 40, no. 1 (2022): 353–58. http://dx.doi.org/10.18280/ijht.400143.

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Increasing combustion efficiency and minimal emissions of pollutants are among the fundamental issues in combustion research. In this regard, the phenomenon of combustion and its influencing factors, such as the fuel / air ratio as one of the most important factors in flame formation, have attracted the attention of many researchers. In this study, the effect of increasing the oxygen ratio over its proportion in the stoichiometric reaction for methane – air combustion was studied. The equations for the conservation of mass, momentum, and energy for a methane-air mixture have been solved by usi

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27

Balogun, Fatimoh, Aneesh Vasudev, Alireza Kakoee, Katriina Sirviö, and Maciej Mikulski. "Simulation-Based Study of NH3/H2-Dual Fueled HCCI Engine Performance: Effects of Blending Ratio, Equivalence Ratio, and Compression Ratio Using Detailed Chemical Kinetic Modeling." Processes 13, no. 7 (2025): 2049. https://doi.org/10.3390/pr13072049.

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Challenges associated with the homogeneous charge combustion ignition (HCCI) concept include combustion phasing control and a narrow operating window. To address the HCCI engine developmental needs, chemical kinetic solvers have been recently included in the commercial engine simulation toolchains like GT-Suite v2024 upward. This study investigates the feasibility of ammonia (NH3) and hydrogen (H2) as dual fuels in homogenous charge compression ignition (HCCI) engines, leveraging chemical kinetics modeling via GT-Suite software v2024. A validated baseline model was adapted with NH3/H2 injector

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Kim, Min-Su, In-Hoi Koo, Keon-Hyeong Lee, et al. "Experimental Study on the Ignition Characteristics of Scramjet Combustor with Tandem Cavities Using Micro-Pulse Detonation Engine." Aerospace 10, no. 8 (2023): 706. http://dx.doi.org/10.3390/aerospace10080706.

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This experimental investigation focused on the ignition and combustion characteristics of a tandem cavity-based scramjet combustor with side-by-side identical cavities. This study utilized the Pusan National University-direct connect scramjet combustor (PNU-DCSC), which was capable of simulating flight conditions at Mach number 4.0–5.0 and altitudes of 20–25 km using the vitiated air heater (VAH). The combustion tests were conducted under off-design point conditions corresponding to low inlet enthalpy. It is a condition in which self-ignition does not occur, and a micro pulse detonation engine

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Husain, Arkan Khikhal, Mahmood Attallah Mashkoor, and Fuad Abdul Ameer Khalaf. "Numerical Investigation of Influence of Multi-Line Fuel Injection (Methane) on a Tubular Combustor Emissions of Micro Gas Turbine." Journal of University of Babylon for Engineering Sciences 26, no. 7 (2018): 271–85. http://dx.doi.org/10.29196/jubes.v26i7.1537.

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This work presents a technique for design optimization of a gas turbine tubular combustor. This technique is based on the use of computational fluid dynamics (CFD) with CFX solver to reduce emission gases by using multi-line of fuel injection in secondary zone. This research relates the mass fraction of the multi-line of fuel injection as well as the equivalence ratio of the tubular combustion chamber designed for methane fuel. By using k-ε as turbulent model and Probability Density Function (PDF) Flamelet as combustion model. The operating casing data of micro size gas turbine are used, the v

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Hasini, Hasril, Norshah Hafeez Shuaib, and Wan Ahmad Fahmi Wan Abdullah. "CFD Analysis of Temperature Distribution in Can-Type Combustor Firing Synthetic Gas." Applied Mechanics and Materials 393 (September 2013): 741–46. http://dx.doi.org/10.4028/www.scientific.net/amm.393.741.

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This paper presents CFD analysis of the effect of syngas combustion in a full scale gas turbine combustor with specific emphasis given to the flame and flue gas temperature distribution. A base case solution was first established using conventional natural gas combustion. Actual operating boundary conditions such as swirl, diffusion and fuel mass flow were imposed on the model. The simulation result is validated with the flame temperature of typical natural gas combustion. Result from flow and combustion calculation shows reasonable trend of the swirl mixing effect. The maximum flame temperatu

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Hosseini, Seyed, Evan Owens, John Krohn, and James Leylek. "Experimental Investigation into the Effects of Thermal Recuperation on the Combustion Characteristics of a Non-Premixed Meso-Scale Vortex Combustor." Energies 11, no. 12 (2018): 3390. http://dx.doi.org/10.3390/en11123390.

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In small-scale combustors, the ratio of area to the combustor volume increases and hence heat loss from the combustor’s wall is significantly enhanced and flame quenching occurs. To solve this problem, non-premixed vortex flow is employed to stabilize flames in a meso-scale combustion chamber to generate small-scale power or thrust for propulsion systems. In this experimental investigation, the effects of thermal recuperation on the characteristics of asymmetric non-premixed vortex combustion are studied. The exhaust gases temperature, emissions and the combustor wall temperature are measured

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Evita Leninda Fahriza Ayuni, Andinusa Rahmandhika, Daryono, et al. "The Effect of Insulation Thickness on Heat Transfer Characteristics and Flammability in Tube Mesoscale Combustors." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 116, no. 2 (2024): 157–71. http://dx.doi.org/10.37934/arfmts.116.2.157171.

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Micropower generator is a micro-scale energy source that has two main components, namely a micro/mesoscale combustor and thermophotovoltaics (TPV). The micro-scale combustor is one part that functions as a combustion chamber that produces heat in micropower plants. Heptane is used as fuel, while the combustor combustion chamber with a diameter of 3.5 mm is made from duraluminium-quart glass tube. Combustion stability in the combustion chamber is influenced by several factors, such as temperature, geometry, and combustion chamber design. In order to maintain flame stability, mesh is added to th

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Tao, Chengfei, Rongyue Sun, Yichen Wang, et al. "Dynamic Response Mechanism of Ethanol Atomization–Combustion Instability under a Contrary Equivalence Ratio Adjusting Trend." Aerospace 11, no. 2 (2024): 163. http://dx.doi.org/10.3390/aerospace11020163.

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This study experimentally explored the effects of equivalence ratio settings on ethanol fuel combustion oscillations with a laboratory-scale combustor. A contrary flame equivalence ratio adjusting trend was selected to investigate the dynamic characteristics of an ethanol atomization burner. Research findings denote that optimizing the equivalence ratio settings can prevent the occurrence of combustion instability in ethanol burners. In the combustion chamber, the sound pressure amplitude increased from 138 Pa to 171 Pa and eventually dropped to 38 Pa, as the equivalence ratio increased from 0

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Hery Soegiharto, Achmad Fauzan, Ali Mokhtar, Sudarman, and Satworo Adiwidodo. "Role of Flue Gas Inhibitor on Stabilizing Heptane Flame in Meso Scale Combustor." Journal of Energy, Mechanical, Material, and Manufacturing Engineering 6, no. 2 (2021): 111–18. https://doi.org/10.22219/jemmme.v6i2.19458.

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Mesoscale combustor is one of the components that serves to generate heat on a micro power generator. As one of the components of a micro power generator, meso scale combustor serves to supply heat through the combustion process. The stability of the flame in the combustion chamber meso scale combustor is influenced by the temperature of the combustion chamber. One way to maintain a high temperature in the combustion chamber is to insert a flue gas stainless steel mesh resistor.. This research aims to prove the role of flue gas mesh resistors in stabilizing the flame on the meso scale combusto

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Hwang, D., Y. Song, and K. Ahn. "Combustion instability characteristics in a dump combustor using different hydrocarbon fuels." Aeronautical Journal 123, no. 1263 (2019): 586–99. http://dx.doi.org/10.1017/aer.2019.19.

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ABSTRACTThe combustion instability characteristics in a model dump combustor with an exhaust nozzle were experimentally investigated. The first objective was to understand the effects of operating conditions and geometric conditions on combustion instability. The second objective was to examine more generalised parameters that affect the onset of combustion instability. Three different premixed gases consisting of air and hydrocarbon fuels (C2H4, C2H6, C3H8) were burnt in the dump combustor at various inlet velocity, equivalence ratio and combustion chamber length. Dynamic pressure transducer

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De Giorgi, M. G., G. Cinieri, G. Marseglia, Z. Ali Shah, and Ghazanfar Mehdi. "Combustion Efficiency of Carbon-neutral Fuel using Micro-Combustor Designed for Aerospace Applications." Journal of Physics: Conference Series 2716, no. 1 (2024): 012091. http://dx.doi.org/10.1088/1742-6596/2716/1/012091.

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Abstract Recent advancements in the field of micro combustor research are growing for achieving high-performance systems in micro power generation and microelectromechanical devices. To mitigate the hazardous emissions from carbon fuels, as an alternative, zero-carbon-free fuels ammonia, and hydrogen are being explored in micro combustion processes. The distinctive feature of a micro combustor lies in its significantly higher area to volume ratio in comparison with traditional combustion systems, leading to accelerated combustion reaction rates. However, the small size of micro combustors pose

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Jingbin, Hu, Qiu Chenxi, Ji Hong, et al. "Effects of Equivalence Ratio on Combustion Characteristics of Port Fuel Injection Gasoline Engine." Journal of Scientific and Engineering Research 8, no. 10 (2021): 60–66. https://doi.org/10.5281/zenodo.10618080.

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<strong>Abstract</strong> The effect of equivalence ratio on the combustion characteristics of PFI engine was investigated by numerical simulation method, and a simulation model of four-stroke PFI engine was built by CFD software AVL-FIRE, and the effect of different equivalent ratio on the combustion performance of PFI engine was studied. The results show that in the range of 0.8-1.2 equivalent ratio, the instantaneous heat release rate, the highest combustion pressure in the cylinder and the temperature in the cylinder all increase first and then decrease with the increase of equivalent rati

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Tian, Zhiqiang, Lin Wang, Lu Han, Songsong Zhang, Deli Zhang, and Yue Gao. "Combustion and emission characterization of natural gas doped ammonia burner." Thermal Science, no. 00 (2025): 118. https://doi.org/10.2298/tsci250325118t.

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Ammonia-doped natural gas combustion technology has attracted much attention because of its carbon reduction potential and fuel flexibility, but faces the dual challenges of unstable combustion due to uneven mixing in non-premixed combustion mode and the surge of NOx emission. In this study, a new cyclone doped combustor is designed through structural optimization, and the coupling mechanism of ammonia doping ratio on the flow, temperature and emission characteristics of the optimized combustor is systematically revealed. The optimized combustor synergized with the secondary air return improve

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Gejji, Rohan M., Cheng Huang, Christopher Fugger, Changjin Yoon, and William Anderson. "Parametric investigation of combustion instabilities in a single-element lean direct injection combustor." International Journal of Spray and Combustion Dynamics 11 (July 13, 2018): 175682771878585. http://dx.doi.org/10.1177/1756827718785851.

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Self-excited combustion dynamics in a liquid-fueled lean direct injection combustor at high pressure (1 MPa) are described. Studied variables include combustor and air plenum length, inlet air temperature, equivalence ratio, fuel nozzle location, and fuel composition. Measured pressure oscillations were dependent on combustor geometry and ranged from about 1% of mean chamber pressure at low equivalence ratio, up to 20% at high equivalence ratio. In the most unstable cases, strong pressure modes were measured throughout the frequency spectrum including a band around 1.2–1.5 kHz representing the

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Li, Xiang, Qingchun Lei, Xiaocun Zhao, et al. "Combustion Characteristics of a Supersonic Combustor with a Large Cavity Length-to-Depth Ratio." Aerospace 9, no. 4 (2022): 214. http://dx.doi.org/10.3390/aerospace9040214.

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The combustion characteristics of a hydrogen-fueled supersonic combustor featuring a large cavity length-to-depth ratio (i.e., 11) were examined by performing experimental trials while varying the fuel injector positions and equivalence ratios. During these trials, flame chemiluminescence images were acquired simultaneously from the side and bottom of the combustor under Mach 2.0 inflow conditions. The flame was observed to stabilize inside the cavity under all conditions. Proper orthogonal decomposition (POD) and dynamic mode decomposition (DMD) analyses of sequential flame chemiluminescence

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Li, Weixuan, Xiong Chen, Wenxiang Cai, and Omer Musa. "Numerical Investigation of the Effect of Sudden Expansion Ratio of Solid Fuel Ramjet Combustor with Swirling Turbulent Reacting Flow." Energies 12, no. 9 (2019): 1784. http://dx.doi.org/10.3390/en12091784.

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In this paper, the effect of sudden expansion ratio of solid fuel ramjet (SFRJ) combustor is numerically investigated with swirl flow. A computational fluid dynamics (CFD) code is written in FORTRAN to simulate the combustion and flow patterns in the combustion chamber. The connected-pipe facility is used to perform the experiment with swirl, and high-density Polyethylene (HDPE) is used as the solid fuel. The investigation is performed with different sudden expansion ratios, in which the port and inlet diameters are independently varied. The results indicated that the self-sustained combustion

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Li, Fan, Mingbo Sun, Zun Cai, et al. "Effects of Additional Cavity Floor Injection on the Ignition and Combustion Processes in a Mach 2 Supersonic Flow." Energies 13, no. 18 (2020): 4801. http://dx.doi.org/10.3390/en13184801.

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Effects of additional cavity floor injection on the ethylene ignition and combustion processes in a cavity-based scramjet combustor are investigated experimentally in a Mach 2.0 supersonic flow using flame luminosity and CH* (CH radical) spontaneous emission methods and static pressure measurements. Numerical calculation is performed to study the non-reacting flow-field structures prior to ignition. Two injection schemes, including the cavity upstream injection scheme and the combined injection scheme with an additional cavity floor injection, are compared to study the effects of the additiona

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Wu, X., K. Li, and D. Jiang. "Investigation of air-fuel ratio control using ionic current signal." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 221, no. 9 (2007): 1139–46. http://dx.doi.org/10.1243/09544070jauto359.

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The objective of this paper is to investigate the control of air-fuel ratio (AFR) using an ionic current signal. Experimental measurements have been carried out to study the characteristics of the ionic current signal near ignition poles in a constant-volume combustion bomb. The ionic signal is characterized by a front flame and post flame during combustion. The intensity of the ionic signal strongly depends on the AFR at the time of combustion. The maximum values in both the front flame and the post flame will occur at close to the stoichiometric value. Furthermore, minimum values of the dura

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Dubey, Abhishek, and Alessandro Sorce. "Exergy Analysis of Gas Turbine Open Cycle with Pressure Gain Combustion Based on Humphrey Cycle." Journal of Physics: Conference Series 2893, no. 1 (2024): 012036. https://doi.org/10.1088/1742-6596/2893/1/012036.

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Abstract This paper describes an exergy comparison of the pressure gain combustion (PGC) gas turbine (GT) with conventional GT. PGC has recently emerged as a promising approach to achieve major performance improvements in the current gas turbines operating on the Joule cycle, where the potential for major performance upgrades has nearly plateaued. However, the inherently unsteady and periodic nature of this combustion technology presents challenges in modelling the PGC process and understanding its impact on the cycle. In this work, PGC is represented by a steady-state model of constant volume

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Gao, Tianyun, Jianhan Liang, Mingbo Sun, and Zhan Zhong. "Dynamic combustion characteristics in a rectangular supersonic combustor with single-side expansion." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 231, no. 10 (2016): 1862–72. http://dx.doi.org/10.1177/0954410016662062.

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Dynamic combustion characteristics of a rectangular scramjet combustor with single-side expansion were studied experimentally and numerically. Experiments were implemented with an isolator entrance Mach number of 3.46, and an air stagnation temperature of 1430 K. Ethylene was utilized to fuel the combustor over an equivalence ratio range of 0.20 < φ < 0.63. Results indicated that the combustion modes varied from different equivalence ratios. For an intermediate φ = 0.375, an intermittent dynamic combustion occurred. During the dynamic process, the flame sometimes stabilized in the jet wa

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Hwang, Donghyun, and Kyubok Ahn. "Experimental Study on Dynamic Combustion Characteristics in Swirl-Stabilized Combustors." Energies 14, no. 6 (2021): 1609. http://dx.doi.org/10.3390/en14061609.

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An experimental study was performed to investigate the combustion instability characteristics of swirl-stabilized combustors. A premixed gas composed of ethylene and air was burned under various flow and geometric conditions. Experiments were conducted by changing the inlet mean velocity, equivalence ratio, swirler vane angle, and combustor length. Two dynamic pressure sensors, a hot-wire anemometer, and a photomultiplier tube were installed to detect the pressure oscillations, velocity perturbations, and heat release fluctuations in the inlet and combustion chambers, respectively. An ICCD cam

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Suzuki, Y., T. Satoh, M. Kawano, N. Akikawa, and Y. Matsuda. "Combustion Test Results of an Uncooled Combustor With Ceramic Matrix Composite Liner." Journal of Engineering for Gas Turbines and Power 125, no. 1 (2002): 28–33. http://dx.doi.org/10.1115/1.1501916.

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A reverse-flow annular combustor with its casing diameter of 400 mm was developed using an uncooled liner made of a three-dimensional woven ceramic matrix composite. The combustor was tested using the TRDI high-pressure combustor test facility at the combustor maximum inlet and exit temperature of 723 K and 1623 K, respectively. Although both the material and combustion characteristics were evaluated in the test, this report focused on the combustion performance. As the results of the test, the high combustion efficiency and high heat release ratio of 99.9% and 1032 W/m3/Pa were obtained at th

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Woo, Seongphil, Jungho Lee, Ingyu Lee, Seunghan Kim, Yeoungmin Han, and Youngbin Yoon. "Analyzing Combustion Efficiency According to Spray Characteristics of Gas-Centered Swirl-Coaxial Injector." Aerospace 10, no. 3 (2023): 274. http://dx.doi.org/10.3390/aerospace10030274.

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The momentum flux ratio (MFR) significantly affects the mixing characteristics and combustion efficiency of propellants in rocket engine injectors. The spray characteristics of three gas-centered swirl-coaxial injectors used in a full-scale combustion test were investigated according to the change in the momentum flux ratio. The difference in combustion efficiency was analyzed through the comparison with combustion test results using spray visualization and quantification. The spray cross-sectional shape and droplet distribution were measured using a structured laser illumination planar imagin

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Yang, Shuang Ping, Jie Dong, and Miao Wang. "Experiment on Combustion-Supporting Agent on PCI for Combustibility of Coal Powder." Materials Science Forum 658 (July 2010): 248–51. http://dx.doi.org/10.4028/www.scientific.net/msf.658.248.

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In order to improve the combustion effects of pulverized coal and replacement ratio of coals, the combustion- supporting mechanism, development and applications are analyzed and industry experiment are carried out based on the research of combustion- supporting agent without alkalis on coals combustion with TG- DTG- DSC ways. The results show that there is an optimum addition percent for coals combustion with combustion- supporting agent. The coal ratio and coke ratio are improved obviously with 1.7%combustion- supporting agent in LongGang.

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Raison, R. J., P. K. Khanna, and P. V. Woods. "Mechanisms of element transfer to the atmosphere during vegetation fires." Canadian Journal of Forest Research 15, no. 1 (1985): 132–40. http://dx.doi.org/10.1139/x85-022.

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Published data and newly presented evidence demonstrate that the proportion of N or P lost from plant material during combustion under a wide range of conditions increases linearly with percentage loss of fuel weight during combustion. For N the correlation is strong, and the slope (β) of the regression line approaches unity for combustions under field or simulated-field conditions, but reduces to 0.78 for materials combusted in a muffle furnace. Almost all of the losses of N are due to volatilization. The relationship for P is less well defined, and β is lower (0.56 for field studies; about 0

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