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Relevant bibliographies by topics / Turbulent combustion

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Academic literature on the topic 'Turbulent combustion'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 July 2024

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Journal articles on the topic "Turbulent combustion"

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Alhumairi, Mohammed, and Özgür Ertunç. "Active-grid turbulence effect on the topology and the flame location of a lean premixed combustion." Thermal Science 22, no. 6 Part A (2018): 2425–38. http://dx.doi.org/10.2298/tsci170503100a.

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Lean premixed combustion under the influence of active-grid turbulence was computationally investigated, and the results were compared with experimental data. The experiments were carried out to generate a premixed flame at a thermal load of 9 kW from a single jet flow combustor. Turbulent combustion models, such as the coherent flame model and turbulent flame speed closure model were implemented for the simulations performed under different turbulent flow conditions, which were specified by the Reynolds number based on Taylor?s microscale, the dissipation rate of turbulence, and turbulent kinetic energy. This study shows that the applied turbulent combustion models differently predict the flame topology and location. However, similar to the experiments, simulations with both models revealed that the flame moves toward the inlet when turbulence becomes strong at the inlet, that is, when Re? at the inlet increases. The results indicated that the flame topology and location in the coherent flame model were more sensitive to turbulence than those in the turbulent flame speed closure model. The flame location behavior on the jet flow combustor significantly changed with the increase of Re?.

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MIYAUCHI, Toshio. "Turbulence and Turbulent Combustion." TRENDS IN THE SCIENCES 19, no. 4 (2014): 4_44–4_48. http://dx.doi.org/10.5363/tits.19.4_44.

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d’Adamo, Alessandro, Clara Iacovano, and Stefano Fontanesi. "A Data-Driven Methodology for the Simulation of Turbulent Flame Speed across Engine-Relevant Combustion Regimes." Energies 14, no. 14 (July 12, 2021): 4210. http://dx.doi.org/10.3390/en14144210.

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Turbulent combustion modelling in internal combustion engines (ICEs) is a challenging task. It is commonly synthetized by incorporating the interaction between chemical reactions and turbulent eddies into a unique term, namely turbulent flame speed sT. The task is very complex considering the variety of turbulent and chemical scales resulting from engine load/speed variations. In this scenario, advanced turbulent combustion models are asked to predict accurate burn rates under a wide range of turbulence–flame interaction regimes. The framework is further complicated by the difficulty in unambiguously evaluating in-cylinder turbulence and by the poor coherence of turbulent flame speed (sT) measurements in the literature. Finally, the simulated sT from combustion models is found to be rarely assessed in a rigorous manner. A methodology is presented to objectively measure the simulated sT by a generic combustion model over a range of engine-relevant combustion regimes, from Da = 0.5 to Da = 75 (i.e., from the thin reaction regime to wrinkled flamelets). A test case is proposed to assess steady-state burn rates under specified turbulence in a RANS modelling framework. The methodology is applied to a widely adopted combustion model (ECFM-3Z) and the comparison of the simulated sT with experimental datasets allows to identify modelling improvement areas. Dynamic functions are proposed based on turbulence intensity and Damköhler number. Finally, simulations using the improved flame speed are carried out and a satisfactory agreement of the simulation results with the experimental/theoretical correlations is found. This confirms the effectiveness and the general applicability of the methodology to any model. The use of grid/time resolution typical of ICE combustion simulations strengthens the relevance of the proposed dynamic functions. The presented analysis allows to improve the adherence of the simulated burn rate to that of literature turbulent flames, and it unfolds the innovative possibility to objectively test combustion models under any prescribed turbulence/flame interaction regime. The solid data-driven representation of turbulent combustion physics is expected to reduce the tuning effort in ICE combustion simulations, providing modelling robustness in a very critical area for virtual design of innovative combustion systems.

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Gorev, V. A. "Modes of Explosive Combustion during Emergency Explosions of the Gas Clouds in the Open Space." Occupational Safety in Industry, no. 8 (August 2022): 7–12. http://dx.doi.org/10.24000/0409-2961-2022-8-7-12.

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Emergency explosions of steam clouds in the open space occur in the deflagration combustion mode. Destructive force of the explosive waves is mainly determined by the rate of combustion in the steam cloud. Therefore, the issue of explosive combustion rate is the key one for predicting explosion parameters. To form the waves of destructive force, it is required that the combustion rate of the substance in the cloud increase by 30 or more times compared to laminar. The main and generally recognized mechanism of combustion intensification is turbulization of the process as a result of interaction of the gas flow field with various obstacles located in the area of the exploding cloud. In the work, the analysis focuses on the combustion processes in the obstacles with continuously changing blocking of space. Under such conditions, the combustion is not structured, it smoothly changes its characteristics, and not jerks at the locations of blocking barriers. That is, explosive combustion can be considered as a classic turbulent combustion of a homogeneous mixed mixture. The work gives preference to the analysis of works, in which the turbulent combustion rate is presented as allowing a change in the scale of turbulence. The results of these works are presented in the form of functions ff(U¢/Sl, l/d) of the ratio of the pulsation component of turbulence to the laminar combustion rate, and the ratio of the integral scale of turbulence to the thickness of the laminar flame. The work gives a comparison of the turbulent combustion velocity depending on the U¢/SL ratio for three values l/d = 100, 1000, 10 000. On the basis of the turbulent combustion modes diagram, the zones of applicability of various methods for determining the turbulent combustion rate are shown. The paper expresses preference for the Peters theory as the most universal and giving a realistic value of the turbulent combustion rate at l/d >> 1.

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Peters, Norbert. "Turbulent Combustion." Measurement Science and Technology 12, no. 11 (October 19, 2001): 2022. http://dx.doi.org/10.1088/0957-0233/12/11/708.

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Poinsot, Thierry. "Turbulent Combustion." European Journal of Mechanics - B/Fluids 20, no. 3 (May 2001): 427–28. http://dx.doi.org/10.1016/s0997-7546(01)01134-7.

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Peters, N., and Prof Luc Vervisch. "Turbulent combustion." Combustion and Flame 125, no. 3 (May 2001): 1222–23. http://dx.doi.org/10.1016/s0010-2180(01)00233-4.

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Peters,, N., and AM Kanury,. "Turbulent Combustion." Applied Mechanics Reviews 54, no. 4 (July 1, 2001): B73—B75. http://dx.doi.org/10.1115/1.1383686.

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Giacomazzi, Eugenio, and Donato Cecere. "A Combustion Regime-Based Model for Large Eddy Simulation." Energies 14, no. 16 (August 12, 2021): 4934. http://dx.doi.org/10.3390/en14164934.

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The aim of this work is to propose a unified (generalized) closure of the chemical source term in the context of Large Eddy Simulation able to cover all the regimes of turbulent premixed combustion. Turbulence/combustion scale interaction is firstly analyzed: a new perspective to look at commonly accepted combustion diagrams is provided based on the evidence that actual turbulent flames can experience locally several combustion regimes although global non-dimensional numbers would locate such flames in a single specific operating point of the standard combustion diagram. The deliverable is a LES subgrid scale model for turbulent premixed flames named Localized Turbulent Scales Model (LTSM). This is founded on the estimation of the local reacting volume fraction of a computational cell that is related to the local turbulent and laminar flame speeds and to the local flame thickness.

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Sjeric, Momir, Darko Kozarac, and Rudolf Tomic. "Development of a two zone turbulence model and its application to the cycle-simulation." Thermal Science 18, no. 1 (2014): 1–16. http://dx.doi.org/10.2298/tsci130103030s.

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The development of a two zone k-? turbulence model for the cycle-simulation software is presented. The in-cylinder turbulent flow field of internal combustion engines plays the most important role in the combustion process. Turbulence has a strong influence on the combustion process because the convective deformation of the flame front as well as the additional transfer of the momentum, heat and mass can occur. The development and use of numerical simulation models are prompted by the high experimental costs, lack of measurement equipment and increase in computer power. In the cycle-simulation codes, multi zone models are often used for rapid and robust evaluation of key engine parameters. The extension of the single zone turbulence model to the two zone model is presented and described. Turbulence analysis was focused only on the high pressure cycle according to the assumption of the homogeneous and isotropic turbulent flow field. Specific modifications of differential equation derivatives were made in both cases (single and two zone). Validation was performed on two engine geometries for different engine speeds and loads. Results of the cyclesimulation model for the turbulent kinetic energy and the combustion progress variable are compared with the results of 3D-CFD simulations. Very good agreement between the turbulent kinetic energy during the high pressure cycle and the combustion progress variable was obtained. The two zone k-? turbulence model showed a further progress in terms of prediction of the combustion process by using only the turbulent quantities of the unburned zone.

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Dissertations / Theses on the topic "Turbulent combustion"

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Ahmed, Umair. "Flame turbulence interaction in premixed turbulent combustion." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/flame-turbulence-interaction-in-premixed-turbulent-combustion(f23c7263-df3d-41fa-90ed-41735fcaa34a).html.

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Gete, Zenebe. "et-enhanced turbulent combustion." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/29969.

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A study of the squish-jet design concept in spark ignition engines, with central ignition, was conducted in a constant volume chamber. The effects of jet size, jet number and jet orientation in generating turbulence and jet enhanced turbulent combustion were investigated. Three sets of configurations with three port sizes were used in this study. The research was carried out in three stages: 1.Qualitative information was obtained from flow visualization experiments via schlieren photography at 1000 frames per second. The flow medium was air. A sequence of frames at specific time intervals were selected to study the results from the respective configurations and jet sizes. The swirling nature of the flow is vivid in the offset arrangement. 2.Pre-ignition pressure and combustion pressure traces were measured with a piezoelectric pressure transducer from which characterising parameters such as maximum pressure, ignition advance and mass burn rate were analysed. Mass fraction curves were calculated using the simple model of fractional pressure rise. A maximum pressure increase of 66% over the reference quiescent combustion case, and combustion duration reduction of 77% were obtained for the offset arrangement with 2 mm diameter port. Comparisons of the times required for 10%, 50% and 90% mass burned are identified and confirmed that it took the 2 mm jet the shortest time to burn 90% of the mixture in the chamber. 3.Two-component velocity measurements were made using an LDV system. Measurements were taken in the central vertical plane of the chamber at specified locations. The data collected were window ensemble- averaged for the mean and fluctuating velocities over a number of cycles. Data intermittency and low data rate precluded, however, cycle-by-cycle analysis. Mean tangential velocities were calculated for each case and the data were used to construct a movie of the tangential velocity as a function of time, suitable for quantitative flow visualization. The vortical nature of the flow was recorded, the distribution being neither solid body rotation nor free vortex, but some complex fluid motion. The jet scale and orientation influence the in generation of turbulence flow field in the chamber, affecting the rate of combustion and the ensuing maximum pressure rise. The offset jet arrangement gives the best results, whereas radially opposed jets have a reduced effect. Increasing the number of jets in opposed arrangement does not enhance turbulent flow. Turbulent flow in the spark region during the onset of ignition was found to be important.
Applied Science, Faculty of
Mechanical Engineering, Department of
Graduate

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Louch, Derek Stanley. "Vorticity and turbulent transport in premixed turbulent combustion." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.625005.

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Nathani, Arun. "A turbulent combustion noise model." Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/43102.

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A turbulent combustion noise model based on first principles is developed in this thesis. The model predicts (1) the pressure time series, (2) Sound Pressure Level (SPL) spectrum, (3) Over-All Sound Pressure Level (OASPL), (4) the thermoacoustic efficiency, (5) the peak frequency, and (6) the sound power of combustion generated noise. In addition, a correlation for sound power is developed based on fundamental burner and fuel variables known to affect the acoustic characteristics of turbulent combustion. The predicted pressure time series exhibits consistency with reality in that it has no steady component. It also confirms speculation in the literature that the predominant noise mechanism in open turbulent flames results from a "transition burning" phenomenon at the flame front. The predicted Sound Pressure Level spectrum, Over-All Sound Pressure Level, and the thermoacoustic efficiency are in excellent agreement with the results available in the literature. The shifts in the peak frequency with basic burner and fuel parameters are consistent with experimental observations from the literature. The disagreements between the predicted and the observed exponents of fuel and burner parameters for sound power are shown to be well within the standard deviation of the experimental observations. Certain areas for further analytical research on the combustion noise mechanism are identified.
Master of Science

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Schmidt, Wolfram. "Turbulent thermonuclear combustion in degenerate stars." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=970936532.

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Mastorakos, Epaminondas. "Turbulent combustion in opposed jet flows." Thesis, Imperial College London, 1994. http://hdl.handle.net/10044/1/11820.

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Kostiuk, Larry William. "Premixed turbulent combustion in counterflowing streams." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305530.

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YAMAMOTO, Kazuhiro, Satoshi INOUE, Hiroshi YAMASHITA, Daisuke SHIMOKURI, and Satoru ISHIZUKA. "Flow Field of Turbulent Premixed Combustion in a Cyclone-Jet Combustor." The Japan Society of Mechanical Engineers, 2007. http://hdl.handle.net/2237/9384.

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Hawkes, Evatt Robert. "Large eddy simulation of premixed turbulent combustion." Thesis, University of Cambridge, 2001. https://www.repository.cam.ac.uk/handle/1810/251761.

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Pater, Sjoerd Gerardus Maria. "Acoustics of turbulent non-premixed syngas combustion." Enschede : University of Twente [Host], 2007. http://doc.utwente.nl/58039.

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Books on the topic "Turbulent combustion"

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Echekki, Tarek, and Epaminondas Mastorakos, eds. Turbulent Combustion Modeling. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0412-1.

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Yoshida, Akira, ed. Smart Control of Turbulent Combustion. Tokyo: Springer Japan, 2001. http://dx.doi.org/10.1007/978-4-431-66985-2.

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A, Libby Paul, and Williams F. A. 1934-, eds. Turbulent reacting flows. London: Academic Press, 1994.

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Turbulent premixed flames. Cambridge: Cambridge University Press, 2011.

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Vaidyanathan, Sankaran, Stone Christopher, and NASA Glenn Research Center, eds. Subgrid combustion modeling for the next generation national combustion code. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2003.

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Vaidyanathan, Sankaran, Stone Christopher, and NASA Glenn Research Center, eds. Subgrid combustion modeling for the next generation national combustion code. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2003.

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7

C, Mongia H., So Ronald M. C, and Whitelaw James H, eds. Turbulent reactive flow calculations. New York: Gordon and Breach Science Publishers, 1988.

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8

Kuo, Kenneth K., and Ragini Acharya. Fundamentals of Turbulent and Multiphase Combustion. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118107683.

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Kuo, Kenneth K., and Ragini Acharya. Applications of Turbulent and Multiphase Combustion. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118127575.

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De, Santanu, Avinash Kumar Agarwal, Swetaprovo Chaudhuri, and Swarnendu Sen, eds. Modeling and Simulation of Turbulent Combustion. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-7410-3.

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Book chapters on the topic "Turbulent combustion"

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Warnatz, Jürgen, Ulrich Maas, and Robert W. Dibble. "Turbulent Reacting Flows." In Combustion, 163–86. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-98027-5_12.

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Warnatz, Jürgen, Ulrich Maas, and Robert W. Dibble. "Turbulent Nonpremixed Flames." In Combustion, 187–200. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-98027-5_13.

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Warnatz, Jürgen, Ulrich Maas, and Robert W. Dibble. "Turbulent Premixed Flames." In Combustion, 201–12. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-98027-5_14.

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Warnatz, Jürgen, Ulrich Maas, and Robert W. Dibble. "Turbulent Reacting Flows." In Combustion, 157–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-97668-1_12.

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Warnatz, Jürgen, Ulrich Maas, and Robert W. Dibble. "Turbulent Nonpremixed Flames." In Combustion, 179–92. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-97668-1_13.

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Warnatz, Jürgen, Ulrich Maas, and Robert W. Dibble. "Turbulent Premixed Flames." In Combustion, 193–204. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-97668-1_14.

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Warnatz, Jürgen, Ulrich Maas, and Robert W. Dibble. "Turbulent Reacting Flows." In Combustion, 163–86. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-662-04508-4_12.

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Warnatz, Jürgen, Ulrich Maas, and Robert W. Dibble. "Turbulent Nonpremixed Flames." In Combustion, 187–200. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-662-04508-4_13.

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Warnatz, Jürgen, Ulrich Maas, and Robert W. Dibble. "Turbulent Premixed Flames." In Combustion, 201–12. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-662-04508-4_14.

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Riley, James J. "Turbulent Combustion Modelling." In Transition, Turbulence and Combustion Modelling, 489–527. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4515-2_8.

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Conference papers on the topic "Turbulent combustion"

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Wang, Fang, Yong Huang, and Tian Deng. "Simulation of Turbulent Combustion Using Various Turbulent Combustion Models." In 2009 Asia-Pacific Power and Energy Engineering Conference. IEEE, 2009. http://dx.doi.org/10.1109/appeec.2009.4918759.

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Wang, F., Y. Huang, and T. Deng. "Gas Turbine Combustor Simulation With Various Turbulent Combustion Models." In ASME Turbo Expo 2009: Power for Land, Sea, and Air. ASMEDC, 2009. http://dx.doi.org/10.1115/gt2009-59198.

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Along with the development of computing technology, large-eddy simulation turns to be a useful tool for practical study. For fast estimation, the front line researchers still use the Reynolds-averaged Navier-Stokes (RANS) method nowadays. RANS still is the major tool for gas turbine chamber (GTC) designers, but there is not a universal method in RANS GTC spray combustion simulation at present especially for the two-phase turbulent combustion. Usually there are two main steps in two-phase combustion: the liquid fuel evaporation and the gas mixture combustion. Thus, three widely used turbulent combustion models: the Eddy-Break-Up and Arrhenius model (EBU), Laminar Flame-let Model (LFM) and Eddy-Dissipation-Concept (EDC) turbulent combustion models are firstly tested against a methane-air turbulent gas jet flame (Flame D) measured by Sandia Lab and next a two-phase turbulent swirl spray combustion in a complex GTC. The predictions of the LFM model are the best in jet flame simulation to show its ability in gas combustion prediction. The comparison between the simulation results and the experimental results showed that LFM model could properly consider the interaction between turbulence and chemistry in the gas combustion in most regions; EBU model overestimated the turbulent effect in most regions; though EDC model takes the chemistry effect into account, the turbulence seems be overestimated too. The simulated GTC performed well in experiments especially when the fuel-air mixture equivalence ratio (MER) in its main-reaction-zone (MRZ) is 0.7, so the three combustion models are all applied in this case, with the same 90° spray angel, same material properties and the same discrete ordinates (DO) radiation model. In LFM prediction, the high temperature regions are distributed around the margin of the circumfluence zone and the downstream regions after MRZ, which does not agree with the test observation. The LFM model deals well with the gas combustion, so the reason for this poor performance must be of kerosene evaporation. LFM model is a fast-chemistry model, but the kerosene reaction rate is not very fast and the evaporation makes the global reaction slower. Furthermore the mixture fraction is a conservation scalar in FLM model but it is changed by the kerosene evaporation especially in the MRZ where the kerosene was mainly vaporized. Generally, the EBU and EDC results are better: the high temperature regions are mostly in MRZ when MER is 0.7. The EDC model also has good predictions of different MERs in MRZ. When MER is 1.3, the unburned kerosene continue reaction after primary-air-holes; when MER is 0.3, there is nearly no kerosene there. Additionally, effects of the spray angle, material property are studied.

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Forliti, David J., Alison A. Behrens, Paul J. Strykowski, and Brian A. Tang. "Enhancing Combustion in a Dump Combustor Using Countercurrent Shear: Part 1 — Nonreacting Flow Control and Preliminary Combustion Results." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-81267.

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During the last decade, countercurrent shear has been established as an effective flow control technique for increasing turbulent mixing in a variety of flow configurations and operating regimes. Based on the robust mixing enhancement observed for jets and shear layers, the technique appears to have many potential benefits for enhancement and control for turbulent combustion flows. Countercurrent shear flow control has been applied to a planar asymmetric rearward-facing step dump combustor. A nonreacting flow study on the implementation of suction-based countercurrent shear at the dump plane provided insight into the flow control mechanisms. Control of turbulence velocity and length scales occurs through two mechanisms, the development of a countercurrent shear layer near the dump plane, and enhanced global recirculation caused by the removal of mass at the dump plane. Parametric studies on the geometry of the suction slot indicate that the enhancement of the global recirculation zone is the primary mechanism for increasing global turbulence levels within the combustor. Turbulence energy and length scales both increase in a manner such that the spatially-filtered strain rates as measured with particle image velocimetry remain nominally constant, a desirable characteristic for premixed turbulent combustion. Connections will be made to a recent study on fully-developed turbulent countercurrent shear layers showing additional attractive features of countercurrent shear including enhanced turbulent energy production, entrainment, and three dimensionality. Preliminary reacting flow results for the dump combustor operating while burning premixed/prevaporized JP-10 illustrate qualitative changes in the turbulent combustion process within the combustor. The companion paper will describe the quantitative effects of countercurrent shear on the global heat release rates within the combustor.

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Chen, Jacqueline. "Combustion---Terascale direct numerical simulations of turbulent combustion." In the 2006 ACM/IEEE conference. New York, New York, USA: ACM Press, 2006. http://dx.doi.org/10.1145/1188455.1188513.

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Candel, Sebastien, Denis Veynante, Francois Lacas, Eric Maistret, Nasser Darabiha, and Thierry Poinsot. "FLAMELET DESCRIPTION OF TURBULENT COMBUSTION." In International Heat Transfer Conference 9. Connecticut: Begellhouse, 1990. http://dx.doi.org/10.1615/ihtc9.1870.

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Williams, Forman. "Descriptions of Nonpremixed Turbulent Combustion." In 44th AIAA Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2006. http://dx.doi.org/10.2514/6.2006-1505.

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MONTAZEL, X., J. SAMANIEGO, F. LACAS, T. POINSOT, and S. CANDEL. "Turbulent combustion modelling in a side dump ramjet combustor." In 28th Joint Propulsion Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1992. http://dx.doi.org/10.2514/6.1992-3599.

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Yan, Beibei, Xuesong Bai, Guanyi Chen, and Changye Liu. "Numerical Simulation of Turbulent Biogas Combustion." In ASME 2007 Energy Sustainability Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/es2007-36164.

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Operating parameters are considered important for the biogas combustion process and the resulted flame features. The paper investigated the influence of typical parameters through numerical simulation, which include the dimension of combustor, fuel and air mass flow, and secondary air supply. The results from the simulations show that the biogas combustion behaves, to some extent, similarly to the methane combustion, yet significant differences exist between their flames. The combustion process is fairly sensitive to the geometrical and operational parameters. Biogas flame temperature is even lower compared to the methane flame temperature because biogas contains CO2 resulting in low heating value, therefore it is not straightforward to obtain stable combustion. Preheated secondary air or reduced its mass flow may have to be used in this case.

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Barhaghi, Darioush G., and Daniel Lörstad. "Investigation of Combustion in a Dump Combustor Using Different Combustion and Turbulence Models." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-44095.

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Modelling combustion in gas turbine combustors remains to be a challenge since several different physical phenomena interact in the process. One of the most important aspects of the combustion in a gas turbine combustor is the chemistry-turbulence interaction. In order to study the effect of the combustion and turbulence models, a dump combustor geometry is selected. Two combustion models namely, finite rate chemistry and flamelet based models, together with different turbulent models including LES 1eq k-model, RANS k-epsilon and k-omega models are implemented using both CFX and OpenFoam codes. The predicted temperature and velocity fields are compared to the existing experimental results. It is shown that different turbulence models behave very differently and there are large discrepancies between the experimental and predicted results. Some part of the discrepancies may be due to unknown heat losses through the combustor wall in the experiment.

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10

Kok, Jim B. W., and Bram de Jager. "Modeling of Combustion Noise in Turbulent, Premixed Flames." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90567.

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Abstract:

In regular operation all gas turbine combustors have a significant noise level induced by the turbulent high power flame. This noise is characteristic for the operation as it is the result of the interaction between turbulence and combustion. Pressure fluctuations may also be generated by thermoacoustic instabilities induced by amplification by the flame of the acoustic field in the combustor. This paper focuses on prediction of the former process of the noise generation in a premixed natural gas combustor. In order to predict noise generated by turbulent combustion, a model is proposed to calculate the power spectrum of combustion noise in a turbulent premixed natural gas flame on the basis of a steady state RaNS CFD analysis. The instantaneous propagation of acoustic pressure fluctuations is described by the Lighthill wave equation, with the combustion heat release acting as a monopole source term. For a semi infinite tube the solution can be written as a volume integral over the acoustic domain using a Green’s function. The source term is written as a function of a reaction progress variable for combustion. Finite chemical kinetics is taken into account by using the TFC model, and turbulence is described by the k-ε model. Subsequently the volume integral for the noise field is evaluated for the turbulent situation on basis of the calculated steady state combustion solution and presumed shape probability density function weighting. The k- ε model provides the parameters for the presumed spectrum shape. Experiments have been performed in a 100 kW preheated premixed natural gas combustor. Comparison of predicted sound spectra with experimental results shows that the model is capable of prediction of the Sound Pressure Level. The modeled spectrum agrees well with the trends observed in the measured spectra.

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Reports on the topic "Turbulent combustion"

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Libby, P. A. Premixed turbulent combustion. Office of Scientific and Technical Information (OSTI), January 1991. http://dx.doi.org/10.2172/6065676.

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Pope, Stephen B. PDF Modelling of Turbulent Combustion. Fort Belvoir, VA: Defense Technical Information Center, August 2005. http://dx.doi.org/10.21236/ada452252.

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Pope, Stephen B. Mapping Closures for Turbulent Combustion. Fort Belvoir, VA: Defense Technical Information Center, April 1994. http://dx.doi.org/10.21236/ada279995.

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Kennedy, Ian M. Experiments in Turbulent Spray Combustion. Fort Belvoir, VA: Defense Technical Information Center, August 1996. http://dx.doi.org/10.21236/ada315719.

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Pope, Stephen B. PDF Modelling of Turbulent Combustion. Fort Belvoir, VA: Defense Technical Information Center, July 2000. http://dx.doi.org/10.21236/ada379844.

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Pitsch, Heinz. Large Eddy Simulation of Turbulent Combustion. Fort Belvoir, VA: Defense Technical Information Center, October 2005. http://dx.doi.org/10.21236/ada448326.

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Pope, S. B. Reaction and diffusion in turbulent combustion. Office of Scientific and Technical Information (OSTI), October 1992. http://dx.doi.org/10.2172/6922826.

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Bowman, C. T., R. K. Hanson, M. G. Mungal, and W. C. Reynolds. Turbulent Reacting Flows and Supersonic Combustion. Fort Belvoir, VA: Defense Technical Information Center, March 1992. http://dx.doi.org/10.21236/ada251065.

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Pope, S. B. Reaction and diffusion in turbulent combustion. Office of Scientific and Technical Information (OSTI), October 1991. http://dx.doi.org/10.2172/5833755.

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Bowman, C. T., R. K. Hanson, M. G. Mungal, and W. C. Reynolds. Turbulent Reacting Flows and Supersonic Combustion. Fort Belvoir, VA: Defense Technical Information Center, March 1991. http://dx.doi.org/10.21236/ada236759.

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