Modeling of ONERA experiment with subsonic premixed turbulent flame in duct with backward step

Мұқаба

Дәйексөз келтіру

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Аннотация

The premixed subsonic turbulent combustion of methane-air mixture in channel with backward step is considered. (Magre P. et al., ONERA, 1975–1989). These experiments represent basic physical mechanisms, which are common for combustion processes in gas turbine units. The brief review of previous works on numerical modeling of these experiments is presented. The new results of numerical investigation of stable flame regime for this experimental setup are presented. The choice of turbulence model and its influence on flow structure are described. Various approaches for turbulent combustion description, based on PaSR (Partially Stirred Reactor) are compared with quasi-laminar approach. The recommendations are given for choice between global and multistage chemical kinetics in combination with different models for turbulence combustion interaction. The influence of variable turbulent Prandtl and Schmidt number model on this flow representation. The ideas for further research are formulated.

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Авторлар туралы

V. Vlasenko

Central Aerohydrodynamic Institute (TsAGI); Moscow Institute of Physics and Technology

Хат алмасуға жауапты Автор.
Email: vlasenko.vv@yandex.ru
Ресей, Zhukovsky; Dolgoprudny

R. Balabanov

Central Aerohydrodynamic Institute (TsAGI); Moscow Institute of Physics and Technology

Email: vlasenko.vv@yandex.ru
Ресей, Zhukovsky; Dolgoprudny

Wenchao Liu

Moscow Institute of Physics and Technology

Email: vlasenko.vv@yandex.ru
Ресей, Dolgoprudny

S. Molev

Central Aerohydrodynamic Institute (TsAGI)

Email: vlasenko.vv@yandex.ru
Ресей, Zhukovsky

V. Sabelnikov

Central Aerohydrodynamic Institute (TsAGI)

Email: vlasenko.vv@yandex.ru
Ресей, Zhukovsky

Әдебиет тізімі

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Әрекет
1. JATS XML
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2. Fig. 1. ONERA experimental setup scheme

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3. Fig. 2. Time-averaged temperature fields obtained by TsAGI in 2D URANS combustion simulations using the q–ω turbulence model in the quasi-laminar formulation (without TCI) and with other different TCI models. The isoline T = 1500 K is shown

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4. Fig. 3. Dependence of the combustion front slope on the velocity of the incoming fresh mixture

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5. Fig. 4. Geometry of the computational domain (a) and the computational grid in the vicinity of the step (b)

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6. Fig. 5. Flow parameter profiles at the inlet to the computational domain: a) longitudinal velocity; b) turbulence intensity; c) ratio

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7. Fig. 6. Temperature fields in simulations without TCI: a) SST model, Frolov4 kinetics; b) Baseline k–ω model, Frolov4 kinetics

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8. Fig. 7. Temperature profiles in three cross-sections in calculations based on the PaSR model a) calculations with different values of the constant Cτ; b) comparison with TsAGI calculations based on the q–ω turbulence model according to the EPaSR model

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9. Fig. 8. Heat release rate fields obtained in calculations with the PaSR model using different kinetic schemes: a) BFER2; b) Frolov4; c) Smooke25

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10. Fig. 9. Comparison of three mechanisms of chemical kinetics: a) dependence of the laminar flame velocity on the excess fuel coefficient and comparison with the experiment [96]; b) dependence of temperature on time during combustion in a reactor p = const; c) dependence of the rate of water vapor formation on temperature, corresponding to graph (a) at φ = 1.0; d) similar dependences corresponding to (b)

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11. Fig. 10. Temperature fields obtained in calculations with Smooke25 kinetics: a) Fluent, without TCI; b) zFlare, taking TCI into account using the EPaSR model

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12. Fig. 11. TsAGI grid for simulating the ONERA experiment

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13. Fig. 12. Examples of unsuccessful average temperature fields obtained in TsAGI calculations with the EPaSR–PrOm model at the stage of adjusting the model parameters: a) flame breakthrough at TW = min(800,T1), ; b) too narrow flame front at TW = min(800,T1)

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14. Fig. 13. Average temperature distribution obtained in zFlare, a) without TCI, k–ω Baseline; b) EPaSR, k–ω Baseline; c) two-channel EPaSR–PrOm, k–ω Baseline

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15. Fig. 14. Profiles of the average temperature T, average longitudinal velocity U and average transverse velocity V. Columns correspond to sections x = 0.1, 0.25, 0.34, 046 and 0.71 m from the channel step

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16. Fig. 15. Field of the volume fraction of fine structures for the ONERA experiment with subsonic combustion. a) EPaSR, k–ω Baseline; b) two-sided EPaSR–PrOm, k–ω Baseline

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17. Fig. 16. Fields of variable turbulent Prandtl and Schmidt numbers obtained by the EPaSR–PrOm model in the ONERA experiment with subsonic combustion

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