Numerical estimation of blowout, flashback, and flame position in MIT micro gas-turbine chamber

Ganji, Hamed B.; Ebrahimi, Reza

doi:10.1016/j.ces.2013.09.056

Cited by 19 publications

(4 citation statements)

References 20 publications

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“…Some extra terms such as the "Reynolds stresses tensors" are generated as a result of the Favre-averaging of the conservation equations. According to several studies [24][25][26][27][28], the realizable k − ε model [29] is presently utilized for modeling the viscous "Reynolds stresses" in a model combustor.…”

Section: Governing Equationsmentioning

confidence: 99%

Analysis of NO Formation and Entropy Generation in a Reactive Flow

Mohammadi

Abedinejad

2022

Aerospace

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A comprehensive investigation of turbulent combustion is accomplished to study the relationship between nitrogen oxide (NO) formation and entropy generation distribution in a non-premixed propane combustion. The radiation heat transfer and combustion are simulated, employing the discrete ordinates model and laminar flamelet model, respectively. A post processing model is employed to estimate the NO formation rate. The present results of NO species formation, mean temperature and velocity are compared with the existing experimental data, and good agreements are obtained. It is shown that the main region of total entropy generation rate and NO formation rate is at the same axial position. The entropy generation distribution may be defined as an index by which the combustion region and main region of NO formation are predicted. However, total entropy generation rate is more sensitive to high temperature (1500–1930 K) than that of NO formation rate. With an increase of 28.7% in temperature, the entropy generation and NO formation rates rise by 900% and 127%, respectively. The occurrence of chemical reactions plays the major role in the generation of entropy.

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Section: Governing Equationsmentioning

confidence: 99%

Analysis of NO Formation and Entropy Generation in a Reactive Flow

Mohammadi

Abedinejad

2022

Aerospace

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“…Some supplementary terms, similar to the Reynolds stresses tensors, are appeared by the Favre averaging of the governing equations. On the basis of the previously reported studies, − the realizable k – ε model is employed presently to model the Reynolds viscous stresses in a combustor. The realizable k – ε transport equations are defined, as follows: Here k and ε signify kinetic energy and dissipation rate, successively.…”

Section: Numerical Models and Equationsmentioning

confidence: 99%

Analysis of Relationship between Entropy Generation and Soot Formation in Turbulent Kerosene/Air Jet Diffusion Flames

2019

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A comprehensive study of turbulent combustion is carried out to analyze the relationship between entropy generation and soot formation in turbulent vaporized kerosene/air jet diffusion flames. Dealing with the laminar flamelet combustion model for predicting the temperature distribution, the Moss–Brookes–Hall model is applied for estimating the soot formation. The radiation heat transfer and turbulent flow are simulated employing the discrete ordinates model and the realizable k – ε turbulence model, respectively. There are credible agreements between the present results of mean temperature, soot volume fraction, and mean mixture fraction and the available experimental data. Results show that the chemical reaction process has the biggest role in the computation of entropy generation while the other processes including viscous dissipation, mass diffusion, and heat conduction can be neglected. The main region of soot formation can directly be predicted by the entropy generation with an acceptable deviation. Also, the surface growth has the major role in the soot formation among the various processes.

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“…Many power MEMS concepts are low Biot number systems, which serves to minimize thermal gradients within the solid structures [23]. However, many of the systems utilize thin solid films as tribological elements, for electrical isolation or for chemical etch protection [24].…”

Section: Fabricationmentioning

confidence: 99%

Review on Progress and Challenges of the Power Generation Systems at Micro-Scales

Chen

2015

ILCPA

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The miniaturization of electro-mechanical devices, and the resulting need for micro-power generation (milliwatts to watts) with low weight, long life devices, has led to the recent development of the field of micro-scale combustion and power generation. The primary objective of this new field is to leverage the high energy density of fuels, specifically liquid hydrocarbon fuels relative to batteries and all other energy storage devices other than nuclear fission, fusion or decay. Some brief scaling arguments are given in this work, and more detailed efforts are referred. A brief introduction to several of the fabrication techniques is presented in this work. Hydrogen-based and some preliminary specialty fuel micro-fuel cells have been successfully developed, and there is a need to develop reliable reformers (or direct conversion fuel cells) for liquid hydrocarbons so that the fuel cells become competitive with the batteries. In this work, the technological issues related to micro-scale combustion and the development of thermochemical devices for power generation will be discussed. Some of the systems currently being developed will be presented, ongoing critical study issues under investigation, and other potential areas of development discussed. Comments regarding the opportunities and limitations of each of the techniques are also presented where applicable.

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Numerical estimation of blowout, flashback, and flame position in MIT micro gas-turbine chamber

Cited by 19 publications

References 20 publications

Analysis of NO Formation and Entropy Generation in a Reactive Flow

Analysis of NO Formation and Entropy Generation in a Reactive Flow

Analysis of Relationship between Entropy Generation and Soot Formation in Turbulent Kerosene/Air Jet Diffusion Flames

Review on Progress and Challenges of the Power Generation Systems at Micro-Scales

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