Turbulence-Chemistry Interaction and Heat Transfer Modeling of H2/O2 Gaseous Injector Flows

Sozer, Emre; Hassan, Ezeldin A.; Seokjun, Yun,; Thakur, Siddharth; Wright, Jeffrey; Ihme, Matthias; Shyy, Wei

doi:10.2514/6.2010-1525

Cited by 16 publications

(6 citation statements)

References 40 publications

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“…As with compressibility, researchers have focused on developing modifications to existing incompressible flamelet models to account for wall heat losses using various approaches. [36][37][38] In this section, the effect of heat loss on the flame structure is illustrated for the HDCR combustor by analyzing the simulations computed using adiabatic walls and those computed allowing for one-dimensional heat transfer through the walls, thereby making solution differences precisely an effect of wall heat transfer.…”

Section: Wall Heat Lossesmentioning

confidence: 99%

A Priori Analysis of Flamelet-based Modeling for a Dual-Mode Scramjet Combustor

Quinlan

McDaniel²,

Drozda

et al. 2014

50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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An a priori investigation of the applicability of flamelet-based combustion models to dual-mode scramjet combustion was performed utilizing Reynolds-averaged simulations (RAS). For this purpose, the HIFiRE Direct Connect Rig (HDCR) flowpath, fueled with a JP-7 fuel surrogate and operating in dual-and scram-mode was considered. The chemistry of the JP-7 fuel surrogate was modeled using a 22 species, 18-step chemical reaction mechanism. Simulation results were compared to experimentally-obtained, time-averaged, wall pressure measurements to validate the RAS solutions. The analysis of the dual-mode operation of this flowpath showed regions of predominately non-premixed, high-Damköhler number, combustion. Regions of premixed combustion were also present but associated with only a small fraction of the total heat-release in the flow. This is in contrast to the scram-mode operation, where a comparable amount of heat is released from non-premixed and premixed combustion modes. Representative flamelet boundary conditions were estimated by analyzing probability density functions for temperature and pressure for pure fuel and oxidizer conditions. The results of the present study reveal the potential for a flamelet model to accurately model the combustion processes in the HDCR and likely other high-speed flowpaths of engineering interest.

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Section: Wall Heat Lossesmentioning

confidence: 99%

A Priori Analysis of Flamelet-based Modeling for a Dual-Mode Scramjet Combustor

Quinlan

McDaniel²,

Drozda

et al. 2014

50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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“…The results from the precomputed laminar flamelets and turbulent statistics are tabulated as a lookup table. The data of this lookup table provide all thermo-chemical quantities of the solution domain during the numerical solution [18] . Assuming a unit Lewis number , the transport equation for the total enthalpy is given by…”

Section: The Governing Equationsmentioning

confidence: 99%

The Formation of Pollutants CO/CO2 in a Steam-Injected Combustor

Darbandi¹,

Ghafourizadeh²,

Schneider³

2018

Proceedings of the 5th International Conference of Fluid Flow, Heat and Mass Transfer (FFHMT'18)

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In this paper, different scenarios for steam injection are examined in a combustor to recognize how the formation of CO and CO 2 pollutants will be affected by such circumstances. The scenarios are inspected via numerical simulations of a chosen combustor. First, the numerical procedures need to be verified. So, we simulate the reactive flow in the combustor under the conditions performed in the corresponding experiment. We validate the numerical solutions by comparing the predicted flame structure with the measured ones. The comparison proves that the current simulations predict the profiles of temperature and CO/CO 2 mass fractions sufficiently accurate. So, we take one more step forward and study different scenarios for the steam injection. To the best of our knowledge, there is no study in literature to investigate these scenarios. We simulate the steam-injected combustors and compare the achieved results with those of the original combustor without equipping it with a steam injector. We consider the steam injection in each of oxidizer and fuel stream separately and compare their contours of temperature, CO, and CO 2 mass fractions inside the combustor with each other. Our explorations indicate that the steam injection reduces the flame temperature as well as the concentrations and emissions of pollutants CO and CO 2 . These findings can be readily used by the designers seeking new qualitative approaches to control the pollutants emissions from industry burners.

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“…The turbulence-chemistry interaction is taken into account using the presumed-shape probability density functions PDFs. The results from precomputed laminar flamelets and turbulent statistics can be tabulated as a three-dimensional lookup table such that all thermo-chemical quantities over the solution domain can be obtained from this table [12].…”

Section: The Governing Equationsmentioning

confidence: 99%

Using Hydrogen Influences to Control the Greenhouse Gas Emissions from Methane-Hydrogen Turbulent Flame

Ghafourizadeh¹,

Darbandi²,

Schneider³

2016

International Conference of Fluid Flow, Heat and Mass Transfer

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In this paper, we study the effects of hydrogen enrichment and depletion on greenhouse gas emissions from a bluff-body stabilized turbulent flame fed with a mixture of methane and hydrogen as its fuel. To do this study, we use the chemical mechanism consisting of 70 species and 463 elementary reactions, adopt flamelet combustion model to surmount the closure problem of chemical source terms within the classical Reynolds-Stress-Model RSM turbulence approaches. We employ the two-equation standard κ-ε turbulence model with round jet corrections incorporated with suitable wall functions. The turbulence-chemistry interaction is taken into account using the presumed-shape probability density functions PDFs. The radiation effects of the most important radiating species are taken into account supposing an optically-thin flame. Using such detailed-chemistry approach, we first simulate a benchmark burner to evaluate the capability of our developed numerical simulation to predict the flame structure. Second, we compare the achieved distributions of temperature and species concentrations within the flame with the available measurement data. The achieved results indicate that our numerical simulation predicts the temperature and species concentration distributions very accurately and that the achieved results are in great agreement with the experimental data. Then, we investigate the effects of enriching fuel on the achieved results. We also compare the results with those of the benchmark case in terms of the greenhouse gas emissions right at the outlet of combustor. Our findings show that the greenhouse gas emissions can be reduced via using suitable hydrogen enrichment techniques. Alternatively, greenhouse gas emissions can increase with hydrogen fuel depletion.

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Turbulence-Chemistry Interaction and Heat Transfer Modeling of H2/O2 Gaseous Injector Flows

Cited by 16 publications

References 40 publications

A Priori Analysis of Flamelet-based Modeling for a Dual-Mode Scramjet Combustor

A Priori Analysis of Flamelet-based Modeling for a Dual-Mode Scramjet Combustor

The Formation of Pollutants CO/CO2 in a Steam-Injected Combustor

Using Hydrogen Influences to Control the Greenhouse Gas Emissions from Methane-Hydrogen Turbulent Flame

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