Modeling the equations of state using a flamelet approach in LRE-like conditions

Lapenna, Pasquale Eduardo; Indelicato, Giuseppe; Lamioni, Rachele; Creta, Francesco

doi:10.1016/j.actaastro.2018.07.025

Cited by 29 publications

(9 citation statements)

References 78 publications

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“…2. The flamelets are solved with the OpenSMOKE++ [49] library developed by the CRECK modeling group and modified in-house in order to deal with flows under rocket-relevant conditions [50]. The employed chemical mechanism is the GRI 3.0 [51] for an oxygen-methane mixture, which although developed for atmospheric pressures has already found application in previous studies of high pressure methane oxy-combustion in rocket-like configurations [52,44,53,54,50].…”

Section: Non-adiabatic Flamelet Modelmentioning

confidence: 99%

“…The flamelets are solved with the OpenSMOKE++ [49] library developed by the CRECK modeling group and modified in-house in order to deal with flows under rocket-relevant conditions [50]. The employed chemical mechanism is the GRI 3.0 [51] for an oxygen-methane mixture, which although developed for atmospheric pressures has already found application in previous studies of high pressure methane oxy-combustion in rocket-like configurations [52,44,53,54,50]. The chosen thermodynamic conditions (pressure p = 20 bar, oxidizer inlet temperature T Ox = 278 K, fuel inlet temperature T F = 269 K and Z st = 0.2) refer to the experimental configuration which will be simulated in the following sections.…”

Section: Non-adiabatic Flamelet Modelmentioning

confidence: 99%

“…is commonly modeled according to statistical independence assumptions, as the product of single-variate PDFs. In particular a β-PDF is generally assumed for the mixture fraction [55,56,50,57,58] and a log-normal or a Dirac delta for the scalar dissipation. In the present work a Dirac delta distribution is assumed for both the scalar dissipation and the enthalpy defect, similarly to [46].…”

Section: Non-adiabatic Flamelet Modelmentioning

confidence: 99%

See 2 more Smart Citations

An efficient modeling framework for wall heat flux prediction in rocket combustion chambers using non adiabatic flamelets and wall-functions

Indelicato

Lapenna

Remiddi

et al. 2021

International Journal of Heat and Mass Transfer

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Section: Non-adiabatic Flamelet Modelmentioning

confidence: 99%

Section: Non-adiabatic Flamelet Modelmentioning

confidence: 99%

Section: Non-adiabatic Flamelet Modelmentioning

confidence: 99%

See 1 more Smart Citation

An efficient modeling framework for wall heat flux prediction in rocket combustion chambers using non adiabatic flamelets and wall-functions

Indelicato

Lapenna

Remiddi

et al. 2021

International Journal of Heat and Mass Transfer

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“…the filtered mixture fraction Z(x, t), the subgrid scale (SGS) mixture fraction variance Z 2 (x, t), and scalar dissipation rate χ(x, t). These parameters allow to account for the effects of the fluid-dynamic strain rate on the flame structure as well as the local degree of mixing, thus providing a consistent averaging of each thermochemical properties taking into account SGS scalar fluctuations [30,31]. The filtered mixture fraction and its variance are evolved in time (t) and space (x i ) according to the modeled transport equations:…”

Section: Numerical Setupmentioning

confidence: 99%

Large Eddy Simulation on the Effects of Pressure on Syngas/Air Turbulent Nonpremixed Jet Flames

Ciottoli

Lee

Lapenna

et al. 2019

Combustion Science and Technology

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The influence of increasing pressure on nonpremixed syngas/air turbulent jet flames is numerically investigated using large eddy simulations in conjunction with a steady laminar flamelet approach. The applicability of the steady flamelet approach is assessed through an extensive parametric study of laminar counterflow flames and tangential stretching rate analysis on target flame structures at different pressures. Two set of large eddy simulations, exploring pressure values up to 10 atm, are carried out. The first one (series A) is characterized by a constant jet Reynolds number, while the second one (series B) is characterized by a constant jet inlet velocity. Both campaigns show narrower flame brushes and reduced radical concentrations with increasing pressure. While for series A the flame length is not sensitive to pressure, a longer flame brush is noticed for series B, being mainly caused by the increased mass flow rate. The sensitivity of the local flame behavior to pressure, such as the OH layer thickness and position, is compared to the available experimental results, showing similar trends with a satisfactory agreement.

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“…As a consequence, using a detailed mechanism can drastically increase the computational cost because a detailed mechanism usually contains tens of species and hundreds of intermediate reactions. The expensive computational cost caused by a detailed mechanism makes the choice of reaction mechanism a trade-off between computational capability and accuracy; also, it spurs the use of reduced mechanisms or an adaptable flamelet assumption approach [32][33][34] in complex situations to capture the flame characteristics. Several studies have been conducted to assess the predictive capabilities of the skeletal mechanisms and global mechanisms.…”

Section: Chemical Kineticsmentioning

confidence: 99%

Large Eddy Simulation of Premixed Stratified Swirling Flame Using the Finite Rate Chemistry Approach

Xiao

Lai

Song

2019

International Journal of Aerospace Engineering

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Large eddy simulations of a stratified swirling flow of a Cambridge swirl burner for both nonreacting and reacting cases are conducted using a finite rate chemistry approach represented by a partially stirred reactor model. The large eddy simulation predictions are compared with experimental measurements for velocity, temperature, and concentrations of major species. The agreement is found in overall trend of velocity prediction, but temperature and concentration of major species show slight discrepancies in the central region. Two reduced chemical mechanisms are examined in the present paper with the objective of assessing their capabilities in predicting swirling flame characteristics, and the distinct difference using two mechanisms is found in CO distribution profiles, which is considered the consequence of different kinetics of CO-CO2 equilibrium. Flow structures are qualitatively and quantitatively analyzed with numerical results. Large-scale vortex structures and precession motions are observed in both nonreacting and reacting cases. Frequency of vortex shedding is identified from the point data of instantaneous velocity in the discharging stream-induced shear layer. On this basis, the intensity and frequency of precession motion are shown to be enhanced in the presence of combustion. Large-scale wrinkling of the flame surface is resolved and characterized in the flame zone, and the effect of mixture stratification is then further discussed.

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Modeling the equations of state using a flamelet approach in LRE-like conditions

Cited by 29 publications

References 78 publications

An efficient modeling framework for wall heat flux prediction in rocket combustion chambers using non adiabatic flamelets and wall-functions

An efficient modeling framework for wall heat flux prediction in rocket combustion chambers using non adiabatic flamelets and wall-functions

Large Eddy Simulation on the Effects of Pressure on Syngas/Air Turbulent Nonpremixed Jet Flames

Large Eddy Simulation of Premixed Stratified Swirling Flame Using the Finite Rate Chemistry Approach

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