Relevant bibliographies by topics / Combustion air preheating

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  1. Journal articles
  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'Combustion air preheating'

Author: Grafiati
Published: 4 June 2021
Last updated: 16 February 2022

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Journal articles on the topic "Combustion air preheating"

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Fan, Min Hui, Guan Qing Wang, Dan Luo, Ri Zan Li, Ning Ding, and Jiang Rong Xu. "Characteristic of Low Calorific Fuel Gas Combustion in Porous Burner by Preheating Air." Applied Mechanics and Materials 624 (August 2014): 361–65. http://dx.doi.org/10.4028/www.scientific.net/amm.624.361.

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The combustion characteristic of low calorific fuel gas was numerically investigated in porous burner by preheating air. Two-dimensional temperature profile, flame propagation precess, and CO reaction rate were analyzed detailly by preheating air, and compared with that of room air. The results showed that when the air is preheated, the combustion flame location locates to upstream, the maximum combustion temperature is higher than that of room air, and flame propagation velocity decreases.The CO oxidation reaction rate increases gradually with the radius distance increaing, but reaction region decreases. CO oxidation region guradually decreases and locates to the upstream with air preheating temperature increasing. Peaks of CO oxidation rate gradually change from two to one.
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Lalovic, Milisav, Zarko Radovic, and Nada Jaukovic. "Characteristics of heat flow in recuperative heat exchangers." Chemical Industry 59, no. 9-10 (2005): 270–74. http://dx.doi.org/10.2298/hemind0510270l.

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A simplified model of heat flow in cross-flow tube recuperative heat exchangers (recuperators) was presented in this paper. One of the purposes of this investigation was to analyze changes in the values of some parameters of heat transfer in recuperators during combustion air preheating. The logarithmic mean temperature (Atm) and overall heat transfer coefficient (U), are two basic parameters of heat flow, while the total heated area surface (A) is assumed to be constant. The results, presented as graphs and in the form of mathematical expressions, were obtained by analytical methods and using experimental data. The conditions of gaseous fuel combustions were defined by the heat value of gaseous fuel Qd = 9263.894 J.m-3, excess air ratio ?= 1.10, content of oxygen in combustion air ?(O2) = 26%Vol, the preheating temperature of combustion air (cold fluid outlet temperature) tco = 100-500?C, the inlet temperature of combustion products (hot fluid inlet temperature) thi = 600-1100?C.
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Mollica, Enrico, Eugenio Giacomazzi, and Marco di. "Numerical study of hydrogen mild combustion." Thermal Science 13, no. 3 (2009): 59–67. http://dx.doi.org/10.2298/tsci0903059m.

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In this article a combustor burning hydrogen and air in mild regime is numerically studied by means of computational fluid dynamic simulations. All the numerical results show a good agreement with experimental data. It is seen that the flow configuration is characterized by strong exhaust gas recirculation with high air preheating temperature. As a consequence, the reaction zone is found to be characteristically broad and the temperature and concentrations fields are sufficiently homogeneous and uniform, leading to a strong abatement of nitric oxide emissions. It is also observed that the reduction of thermal gradients is achieved mainly through the extension of combustion in the whole volume of the combustion chamber, so that a flame front no longer exists ('flameless oxidation'). The effect of preheating, further dilution provided by inner recirculation and of radiation model for the present hydrogen/air mild burner are analyzed.
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Filkoski, Risto, Ilija Petrovski, and Zlatko Gjurchinovski. "Energy optimisation of vertical shaft kiln operation in the process of dolomite calcination." Thermal Science 22, no. 5 (2018): 2123–35. http://dx.doi.org/10.2298/tsci180125278f.

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The essential part of the refractory materials production on a basis of sintered dolomite as raw material is the process of dolomite calcination. The technology process usually takes place in shaft or rotary kilns, where the dolomite stone, CaMg(CO3)2, is subjected to a high temperature heat treatment. The calcination of the dolomite is highly endothermic reaction, requiring significant amount of thermal energy to produce sintered dolomite (CaO, MgO), generating a large flow of hot gases at the furnace outlet. The objective of this work was to assess the possibilities of utilization of waste heat of exhaust gases from a shaft kiln in order to improve the overall energy efficiency of the technology process. Several different options were analyzed: (a) preheating of a raw material, (b) preheating of heavy fuel oil, (c) preheating of combustion air, (d) preheating of combustion air and raw material with flue gas, and (e) preheating of air for combustion and for drying of a raw material. Option (e) was selected as the most attractive and therefore it was analyzed in more details, showing significant annual energy savings and relatively short simple payback period on the investment.
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Castro, Zamir Sánchez, Hugo Reinel García Bernal, and Oscar Andrés Mendieta Menjura. "Efecto del precalentamiento del aire primario y la humedad del bagazo de caña de azúcar durante la combustión en lecho fijo." Corpoica Ciencia y Tecnología Agropecuaria 14, no. 1 (May 24, 2013): 5. http://dx.doi.org/10.21930/rcta.vol14_num1_art:263.

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<p>Los hornos utilizados para la elaboración de panela presentan pérdidas energéticas debido a una combus­tión incompleta del bagazo de caña de azúcar y al calor sensible en los gases de chimenea. Durante el proceso de producción de panela, el bagazo de caña de azúcar se utiliza como combustible, con fracciones másicas de humedad entre 30% y 50%, las cuales afectan el rendi­miento de la combustión de una biomasa en lecho fijo. Gracias a que el precalentamiento del aire disminuye el tiempo de secado, su implementación en muchos sistemas de combustión de biomasa ha incrementado la eficiencia del proceso. Por tanto, en la presente investigación se estudió la influencia del contenido de humedad y el pre­calentamiento del aire primario sobre la temperatura, la composición del gas y la tasa de combustión, mediante un diseño experimental factorial mixto 3x2. Los resul­tados demostraron que el aumento en la humedad del bagazo de caña reduce la tasa de combustión y la con­versión de carbono a CO2, y por tanto, el rendimiento del proceso. Cuando se precalentó el aire primario hasta una temperatura de 120 ºC, la tasa de combustión au­mentó, sin embargo sólo significó un incremento en el rendimiento de la combustión para una fracción másica de humedad de 30%.</p><p><strong>Effect of primary air preheating and moisture sugarcane bagasse during fixed bed combustion</strong></p><p>Furnaces used to making jaggery have energy losses due to incomplete combustion of sugarcane bagasse and sensible heat in the flue gases. During jaggery production process, sugarcane bagasse is used as fuel, with mass fractions of humidity between 30% and 50%, which affect the combustion efficiency of a biomass in a fixed bed. Because the air preheating decreases the drying time, its implementation in many biomass combustion systems increases process efficiency. Therefore, in this investigation we studied the influence of the moisture content and the preheating of the primary air on the combustion of bagasse in a fixed bed furnace, by analyzing the profiles of temperature and concentration of the combustion gas. Results showed that increasing in bagasse moisture reduces the rate of combustion and conversion of carbon to CO2, diminishing the yield of process. When the primary air is preheated to a temperature of 120 ºC, the combustion rate increased, however, only meant an increase in combustion efficiency to a mass fraction of 30% humidity.</p>
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Cui, Yun Jing, and Qi Zhao Lin. "Realization of Flameless Combustion of Liquid Fuel." Advanced Materials Research 512-515 (May 2012): 2088–92. http://dx.doi.org/10.4028/www.scientific.net/amr.512-515.2088.

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Being an advantageous combustion technology, flameless combustion is being widely investigated mainly with gaseous fuels for its high efficiency and low pollution. In this paper the realization of liquid flameless combustion in micro turbine environment is investigated. It is indicated that air preheating is not the essential condition to attain flameless mode and the air injection speed is more important to lower the whole reaction rate. Flameless combustion was described in terms of the realization mechanism, flow field, flame shape, temperature, and emissions. Finally the heat transfer model of the recirculated gas applicable to liquid fuel flameless combustion based on the combustor structure is presented.
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Cui, Zhen Min. "Study on Temperature Distribution of a Honeycomb Regenerator during Preheating Process." Applied Mechanics and Materials 170-173 (May 2012): 2699–702. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.2699.

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The HiTAC technology (High Temperature Air Combustion) is a reliable, industry proven combustion method. A three-dimensional numerical model is established which is for unsteady preheating process in honeycomb regenerator. The preheating period of honeycomb was simulated by means of computational fluid dynamics (CFD) software; the outlet temperature, temperature at lengthways of gas, and temperature at lengthways of honeycomb were obtained.
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Mohanasundaram, Kavin, and Nagarajan Govindan. "Effect of air preheating, exhaust gas recirculation and hydrogen enrichment on biodiesel/methane dual fuel engine." Thermal Science, no. 00 (2020): 146. http://dx.doi.org/10.2298/tsci191024146m.

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An experimental study was carried out to investigate the effect of intake air preheating, exhaust gas recirculation and hydrogen enrichment on performance, combustion and emission characteristics of Methane/waste cooking oil biodiesel fuelled compression ignition engine in dual fuel mode. Methyl ester derived from waste cooking oil was used as a pilot fuel which was directly injected into the combustion chamber at the end of the compression stroke. Methane/hydrogen-enriched methane was injected as the main fuel in the intake port during the suction stroke using a low pressure electronic port fuel injector which is controlled by an electronic control unit. The experiments were conducted at a constant speed and at the maximum load. Experimental results indicated that the increase in energy share of gaseous fuel extends the ignition delay. With air preheating the thermal efficiency increased to 49% and 55% of methane and hydrogen-enriched methane energy share respectively. Carbon monoxide and hydrocarbon emissions were higher in methane combustion with biodiesel when compared to the conventional diesel operation at full load and a reduction in carbon monoxide and hydrocarbon was observed with air preheating. Lower oxides of nitrogen were observed with gaseous fuel combustion and it further reduced with exhaust gas recirculation but oxides of nitrogen increased by preheating the intake air. Improvement in thermal efficiency with a reduction in hydrocarbon and carbon monoxide was observed with hydrogen-enriched methane.
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Newburn, E. Ryan, and Ajay K. Agrawal. "Liquid Fuel Combustion Using Heat Recirculation Through Annular Porous Media." Journal of Engineering for Gas Turbines and Power 129, no. 4 (January 21, 2007): 914–19. http://dx.doi.org/10.1115/1.2719259.

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A counter-flow annular heat recirculating burner was designed for lean prevaporized, premixed combustion. Prior to entering the combustor, the reactants are passed through a porous media-filled preheating annulus surrounding the combustor. Kerosene is dripped by gravity onto the porous media and vaporized by the heat conducted through the combustor wall. Experiments were conducted to evaluate heat transfer and combustion performance at various equivalence ratios, heat release rates, and inlet air temperatures. Results show low CO emissions over a range of equivalence ratios. NOx emissions were high at high heat release rates, indicating inadequate prevaporization and premixing of fuel with air. Heat recirculation and heat loss characteristics are presented at various operating conditions.
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Hubbard, M., D. K. Krehbiel, and S. R. Gollahalli. "A Laboratory-Scale Experimental Study of In-Situ Combustion Processes." Journal of Energy Resources Technology 116, no. 3 (September 1, 1994): 169–74. http://dx.doi.org/10.1115/1.2906439.

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A laboratory-scale experimental study of in-situ combustion for enhanced oil recovery is presented. The effects of oil saturation, preheating of the oil-sand bed, porosity of sand, and air-injection rate on both the time history of liquid yield and the total liquid yield have been determined. From the measured temperature profiles and charred length of oil-sand bed, the propagation rate of combustion front has been deduced. The volumetric concentrations of CO2 and O2 in the effluent gas have been measured. The rate of liquid yield is highest in the initial periods of insitu heating or combustion. Air-injection rate, although it has an indirect influence on the temperatures achieved in the bed, exerts only a weak effect on the liquid yield. The increase in porosity of sand increases the liquid yield rate. The relative effects of air injection rate, oil saturation, and the porosity of sand under combustion conditions are simulated well by preheating the bed.
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More sources

Dissertations / Theses on the topic "Combustion air preheating"

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Šimeček, Radek. "Vliv teploty spalovacího vzduchu na parametry spalovacího procesu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-403868.

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Tato diplomová práce se zabývá předehřevem spalovacího vzduchu a jeho vlivem na parametry spalovacího procesu. V teoretické části je zpracován přehled nejčastějších znečišťujících látek z průmyslového spalování. Je popsána aktuálně platná relevantní legislativa v Evropské unii a jsou porovnány její implementace do národní legislativy v České republice a v Německu. Dále je provedena klasifikace hořáků z hlediska různých kritérií a rešerše předchozí práce v oblasti předehřevu spalovacího vzduchu. Na zkušebně hořáků byla provedena experimentální studie dvou různých hořáků na zemní plyn při konstantním tepelném příkonu 750 kW se spalovacím vzduchem předehřátým až na 250 °C. Výsledky odhalily pozitivní vliv předehřevu na účinnost spalování. Množství emisí NOx a CO naopak rostlo s teplotou spalovacího vzduchu.
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Conference papers on the topic "Combustion air preheating"

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Mariños Rosado, Diego Jhovanny, Samir Boset Rojas Chávez, Jordan Amaro Gutierrez, João Carvalho, Miguel Huaraz Rodriguez, and Andrés Armando Mendiburu Zevallos. "REHEATING FURNACES IN THE STEEL INDUSTRY: UTILIZATION OF COMBUSTION GASES FOR LOAD PREHEATING AND COMBUSTION AIR PREHEATING USING COG, LDG AND BFG AS PROCESS GASES." In 18th Brazilian Congress of Thermal Sciences and Engineering. ABCM, 2020. http://dx.doi.org/10.26678/abcm.encit2020.cit20-0017.

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Ghasemi, Amirmahdi, Mohammad Moghiman, Seyed Mohammad Javadi, and Naseh Hosseini. "Effects of Droplet Size and Air Preheating on Soot Formation in Turbulent Combustion of Liquid Fuel." In ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2010. http://dx.doi.org/10.1115/esda2010-24663.

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The present study is concerned with the effect of fuel droplet size, air inlet preheating and air swirl number on complex soot process in a turbulent liquid-fuelled combustor. A hybrid Eulerian-Lagrangian method is employed to model the reactive flow-field inside the combustor. Equations governing the gas phase are solved by a control volume based semi-implicit iterative procedure while the time-dependent differential equations for each sizes of the fuel droplets are integrated by a semi-analytic method. The processes leading to soot consist of both formation and combustion. Soot formation is simulated using a two-step model while a finite rate combustion model with eddy dissipation concept is implemented for soot combustion. Also, mathematical models for turbulence, combustion, and radiation are used to take account the effects of these processes. Results reveal the significant influence of liquid fuel droplet size, air inlet temperatures and swirl numbers on soot emission from turbulent spray flames. The predictions show that reduction of spray droplet size and increases of air inlet temperature and swirl numbers considerably, increases soot emission from spray flames.
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Newburn, E. Ryan, and Ajay K. Agrawal. "Liquid Fuel Combustion Using Heat Re-Circulation Through Annular Porous Media." In ASME Turbo Expo 2005: Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-68588.

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A counter-flow annular heat recirculating burner was designed for lean pre-vaporized, premixed combustion. Prior to entering the combustor reactants are passed through a porous media-filled preheating annulus surrounding the combustor. Kerosene is dripped by gravity onto the porous media and vaporized by the heat conducted through the combustor wall. Experiments were conducted to evaluate heat transfer and combustion performance at various equivalence ratios, heat release rates, and inlet air temperatures. Results show low CO emissions over a range of equivalence ratios. NOx emissions were high at high heat release rates, indicating inadequate pre-vaporization and premixing of fuel with air. Heat recirculation and heat loss characteristics are presented at various operating conditions.
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Chen, Heng, Zhen Qi, Lihao Dai, Qiao Chen, Gang Xu, and Peiyuan Pan. "A Novel Combustion Air Preheating System in a Large-Scale Coal-Fired Power Unit." In ASME 2019 Power Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/power2019-1909.

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Abstract A novel hybrid system for combustion air heating, including flue gas cooling, air heating and heat regeneration has been proposed. In the reformative scheme, the air gains energy from four tubular heat exchangers and the flue gas releases heat in four tubular heat exchangers as well, instead of the rotary regenerative air preheater (APH) that is used in the conventional scheme. Consequently, the temperature differences between the fluids during heat transmission can be diminished, and the mixing of the hot-cold primary air and the severe leakages are avoided, which remarkably reduces the exergy destruction and enhances the thermal performance of the power unit. The new design was evaluated based on a 670 MW coal-fired supercritical power unit. The results show that the additional net power output of the power unit can reach 8.57 MW with a net efficiency promotion of 0.57 percentage points due to the novel configuration. And the energy saving mechanism of the proposed concept was revealed on grounds of the first and second laws of thermodynamics.
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Li, Yanxia, Zhongliang Liu, Yan Wang, and Jiaming Liu. "Numerical Study of Methane and Air Combustion Inside Heat-Recirculating Combustors." In ASME 2013 Power Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/power2013-98257.

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A numerical model on methane/air combustion inside a small Swiss-roll combustor was set up to investigate the flame position of small-scale combustion. The simulation results show that the combustion flame could be maintained in the central area of the combustor only when the speed and equivalence ratio are all within a narrow and specific range. For high inlet velocity, the combustion could be sustained stably even with a very lean fuel and the flame always stayed at the first corner of reactant channel because of the strong convection heat transfer and preheating. For low inlet velocity, small amounts of fuel could combust stably in the central area of the combustor, because heat was appropriately transferred from the gas to the inlet mixture. Whereas, for the low premixed gas flow, only in certain conditions (Φ = 0.8 ～ 1.2 when ν0 = 1.0m/s, Φ = 1.0 when ν0 = 0.5m/s) the small-scale combustion could be maintained.
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Wang, Difei, Vivek Sahai, and Dah Yu Cheng. "A Combustion Test Facility for Testing Low NOx Combustion Systems." In ASME Turbo Expo 2002: Power for Land, Sea, and Air. ASMEDC, 2002. http://dx.doi.org/10.1115/gt2002-30446.

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Cheng Power Systems has designed and built an atmospheric pressure combustion test facility for gas turbines, which has the capability of testing the full size combustion systems of large gas turbines at atmospheric pressure while maintaining the adiabatic flame temperature at pressurized conditions. The uniqueness of the test facility is the method of preheating the air to the compressor discharge temperature of a gas turbine at high-pressure ratios using the combustion exhaust gas and a compact air-to-air heat exchanger. The exhaust dampers and dilution airflows control the preheated-air temperature. The other characteristic of the test facility is the competence of testing NOx reduction combustion systems using steam or inert gas. The facility has the capability to perform steam injection experiments to examine the combustion stability with massive steam injection rates of up to 20% of air mass flow rate. The test process is fully automated with computer data acquisition and digital control. Combustion systems such as GE Frame 5P, 6B, 7EA, and Westinghouse 501D5A have been tested. With Cheng Power’s unique NOx reduction system (CLN™ - Cheng Low NOx System), less than 5 ppm NOx and very low level of CO were obtained for these combustion systems without hardware modification. The facility is also capable of testing Dry-Low-NOx (DLN) combustion systems. The test system is also assisted by a commercial computer program (Star-CD) to estimate the pressurization effect for extrapolating the test results. The pressure dependence can be simulated with the unique combustion geometry, type of fuel, and onset of turbine inlet temperature, respectively. The results depict the detail of the flame structure under various combustion chamber design characteristics. The model pressurization results correlate well with our experimental results as well as results in the literature.
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Koyama, Masamichi, Hiroshi Fujiwara, Laurent Zimmer, and Shigeru Tachibana. "Effects of Swirl Combination and Mixing Tube Geometry on Combustion Instabilities in a Premixed Combustor." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90891.

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In this paper, flow fields inside a premixed combustor have been investigated by CFD analysis and PIV measurement in a preheating, non-reacting condition. Four types of premixer are examined. The design of the premixer is determined by the combination of swirlers and mixing tubes. There are two variations of triple-concentric swirlers and three variations of mixing tubes. Comparisons are made among mean velocity distributions derived from CFD and PIV. PDF analysis is performed on the data from PIV to discuss the possibility of the occurrence of flashback. Combustion rig tests have been carried out also on similar condition to see combustion instabilities depending on the choice of premixers and operating conditions. Flame is directly observed from crystal windows placed on the side and downstream of the combustion chamber. A glass rod is installed on the wall of the mixing tube so as to see light emissions inside the tube, i.e. evidence of flashback. Pressure fluctuations at the combustor liner are measured in one position. The spectra of pressure fluctuations are computed to look at the possibility of combustion oscillations. Discussions are made on the relation between the global flame structure and pressure modes. Finally, proper premixer configurations to prevent combustion instabilities are proposed.
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Li, Guoqiang, Ephraim J. Gutmark, Nick Overman, Michael Cornwell, Dragan Stankovic, Laszlo Fuchs, and Vladimir Milosavljevic. "Experimental Study of a Flameless Gas Turbine Combustor." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-91051.

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This paper presents experimental data, performed at atmospheric conditions, on a novel flameless combustor with application to gas turbine engines. Flameless combustion is characterized by distributed flame and even temperature distribution achieved at conditions of high preheat air temperature and sufficiently large amounts of recirculating low oxygen concentration exhaust gases. Extremely low emissions of NOx, CO, and UHC are reported in this paper for flameless combustion in a multiple jets premixed gas turbine combustor. Measurements of the flame chemiluminescence, CO and NOx emissions, acoustic pressure, temperature field, and velocity field reveal the influence of various parameters including: preheat temperature, inlet air mass flow rate, combustor exhaust nozzle contraction ratio, and combustor chamber diameter on emissions and combustion dynamics. The data indicate that greater air mass flow rates, thus larger pressure drop, promotes the formation of flameless combustion and lower NOx emissions for the same flame temperature. This flameless combustor is basically a premixed combustion in which NOx emissions is an exponential function of the flame temperature regardless of different air preheating temperatures. High preheat temperature and flow rates also help in forming stable combustion which is another advantageous feature of flameless combustion. The effects of the combustor exhaust contraction and the combustion chamber diameter on emissions and combustion dynamics are discussed.
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Duwig, Christophe, Robert-Zoltan Szasz, and Laszlo Fuchs. "Modelling of Flameless Combustion Using Large Eddy Simulation." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90063.

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The challenge of achieving a clean and stable combustion in modern power plants or aero engines leads to develop new technologies and new combustors. Pioneer work on ‘flameless’ combustion has shown the great potential of such a technology for meeting modern requirements in term of safety and low emissions. The idea behind this technique is to ensure low emissions by operating at very low fuel/air equivalence ratio but with high preheating to stabilize the combustion. In addition, a careful design of the combustor should ensure that fresh gases are diluted by hot exhaust gases. The result is a distributed but efficient oxidation region. This paper presents a new efficient model for simulating ‘flameless’ oxidation. The model is based on Large Eddy Simulation (LES) ensuring an accurate description of the mixing. In addition, a ‘low-cost’ technique for coupling the LES code with some complex chemistry is presented. This approach was used for simulating a reacting jet close to the ‘flameless’ regime. The simulation showed the capability of the present LES tool for understanding the flow dynamics and improving the design of ‘flameless’ combustors.
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Kraus, Christian, Laurent Selle, Thierry Poinsot, Christoph M. Arndt, and Henning Bockhorn. "Influence of Heat Transfer and Material Temperature on Combustion Instabilities in a Swirl Burner." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-56368.

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The current work focuses on the Large Eddy Simulation of a combustion instability in a laboratory-scale swirl burner. Air and fuel are injected at ambient conditions. Heat conduction from the combustion chamber to the plenums results in a preheating of the air and fuel flows above ambient conditions. The paper compares two computations with different modeling strategies. In the first computation, the temperature of the injected reactantsis 300 K (equivalent to the experiment) and the combustor walls are treated as adiabatic. The frequency of the unstable mode (≈ 635 Hz) deviates significantly from the measured frequency (≈ 750 Hz). In the second computation, the preheating effect observed in the experiment and the heat losses at the combustion chamber walls are taken into account. The frequency (≈ 725 Hz) of the unstable mode agrees well with the experiment. These results illustrate the importance of accounting for heat transfer/ losses when applying LES for the prediction of combustion instabilities. Uncertainties caused by unsuitable modeling strategies when using CFD for the prediction of combustion instabilities can lead to an improper design of passive control methods (such as Helmholtz resonators), as these are often only effective in a limited frequency range.
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