Heat Transfer: Volume 4 — Combustion and Energy Systems最新文献

CFD Modeling and Comparison With Data From the NIST Reference Spray Combustor CFD建模及与NIST参考喷雾燃烧器数据的比较

Heat Transfer: Volume 4 — Combustion and Energy Systems Pub Date : 2001-11-11 DOI: 10.1115/imece2001/htd-24236

D. Crocker, J. Widmann, C. Presser

{"title":"CFD Modeling and Comparison With Data From the NIST Reference Spray Combustor","authors":"D. Crocker, J. Widmann, C. Presser","doi":"10.1115/imece2001/htd-24236","DOIUrl":"https://doi.org/10.1115/imece2001/htd-24236","url":null,"abstract":"\u0000 Validation of computational fluid dynamics (CFD) predictions for spray combustion application has been a challenging task due to difficulties in both modeling and experimental measurements. However, validation is considered to be an essential exercise for the success of CFD tools in the development of future combustion systems. This paper describes a benchmark spray combustion database collected at National Institute of Standards and Technology (NIST) and validation of a commercial CFD code using these data. Swirl-stabilized combustion of methanol at lean operating conditions in the NIST reference spray combustor facility was selected to be the baseline case for which both measurements and predictions were made. A comparison is presented of CFD predictions with experimental data for droplet size and velocity, and spray volume flux. The agreement between the CFD calculations and the experimental data is generally good once certain adjustments were made to the measured data close to the injector tip. The adjustments were made based on extrapolation from more accurate downstream measurements. Specification of droplet initial conditions for computational modeling that accurately reflect the laboratory conditions remains a significant issue that needs further improvement.","PeriodicalId":426926,"journal":{"name":"Heat Transfer: Volume 4 — Combustion and Energy Systems","volume":"148 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115409846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

A Mixture Fraction Combustion Model for Large Scale Fire Modeling 大型火灾模拟的混合分数燃烧模型

Heat Transfer: Volume 4 — Combustion and Energy Systems Pub Date : 2001-11-11 DOI: 10.1115/imece2001/htd-24251

K. McGrattan, J. Floyd, S. Hostikka

引用次数: 2

Exact Closure Procedures of Hierarchical VAT Capillary Thermo-Convective Problem for Turbulent and Laminar Regimes 湍流和层流状态下分层VAT毛细热对流问题的精确闭合程序

Heat Transfer: Volume 4 — Combustion and Energy Systems Pub Date : 2001-11-11 DOI: 10.1115/imece2001/htd-24261

V. Travkin, K. Hu, I. Catton

{"title":"Exact Closure Procedures of Hierarchical VAT Capillary Thermo-Convective Problem for Turbulent and Laminar Regimes","authors":"V. Travkin, K. Hu, I. Catton","doi":"10.1115/imece2001/htd-24261","DOIUrl":"https://doi.org/10.1115/imece2001/htd-24261","url":null,"abstract":"\u0000 Volume Averaging Theory (VAT), an effective and rigorous approach for study of transport (laminar and turbulent) phenomena, is used to model flow and heat transfer in porous media. The modeling is based on a simple pore level network. The primary difficulties in applying VAT to straight capillary networks, the many unknown integral and differential terms that are needed for closure, are overcome. VAT based modeling of pore level transport in straight capillaries results in two sets of scale governing equations. One scale is the upper scale VAT equations which describe ensemble properties for flow and heat transfer in porous media. The other scale is the lower scale laminar and turbulent transport equations that represent flow and heat transport in each straight pore capillary. It is how the unknown VAT terms in the upper scale equations can be estimated using the relationships between upper scale properties and lower scale properties. Exact closures and mathematical procedures are developed for the turbulent regime, extending the previous laminar regime work. Numerical results for turbulent and laminar transport in straight capillary porous media are shown in this paper.","PeriodicalId":426926,"journal":{"name":"Heat Transfer: Volume 4 — Combustion and Energy Systems","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117215070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental Validation of Non-Fourier Thermal Response in Porous Media 多孔介质非傅立叶热响应的实验验证

Heat Transfer: Volume 4 — Combustion and Energy Systems Pub Date : 2001-11-11 DOI: 10.1115/imece2001/htd-24279

A. Nnanna, K. T. Harris, A. Haji-sheikh

{"title":"Experimental Validation of Non-Fourier Thermal Response in Porous Media","authors":"A. Nnanna, K. T. Harris, A. Haji-sheikh","doi":"10.1115/imece2001/htd-24279","DOIUrl":"https://doi.org/10.1115/imece2001/htd-24279","url":null,"abstract":"\u0000 An experimental validation of non-Fourier behavior in porous media due to short time thermal perturbation is presented. The governing energy equation is formulated based on the two-equation model and the non-Fourier model. This formulation leads to the emergence of four thermal parameters: lag-time in heat flux τq, lag-time τt in temperature due to interstitial heat transfer coefficient h, and lag-time in the transient response of the temperature gradient τx in the heat flux equation. These parameters account for the microstructural thermal interaction between the fluid and neighboring solid matrix as well as the delay time needed for both phases to approach thermal equilibrium. An experimental verification of the microscale model was performed under standard laboratory conditions. The values of the aforementioned thermal parameters were determined to compute the fluid and solid temperatures. Results predicted from three models (classical Fourier, non-Fourier, and experimental) were compared. It indicates an excellent agreement between the non-Fourier and the experimental model, and a significant deviation of Fourier prediction from the experimental results.","PeriodicalId":426926,"journal":{"name":"Heat Transfer: Volume 4 — Combustion and Energy Systems","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125668833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Perspective on Combustion-Driven Flows With Circulation 燃烧驱动循环流动的观点

Heat Transfer: Volume 4 — Combustion and Energy Systems Pub Date : 2001-11-11 DOI: 10.1115/imece2001/htd-24243

F. Battaglia, R. Rehm, H. Baum, Mohamed I. Hassan, Kozo Saito

引用次数: 0

A Comparison of Diffusion Flame Stability in One and Two Spatial Dimensions Near Cold, Inert Surfaces 低温惰性表面一维和二维扩散火焰稳定性的比较

Heat Transfer: Volume 4 — Combustion and Energy Systems Pub Date : 2001-11-11 DOI: 10.1115/imece2001/htd-24240

R. Vance, I. Wichman

{"title":"A Comparison of Diffusion Flame Stability in One and Two Spatial Dimensions Near Cold, Inert Surfaces","authors":"R. Vance, I. Wichman","doi":"10.1115/imece2001/htd-24240","DOIUrl":"https://doi.org/10.1115/imece2001/htd-24240","url":null,"abstract":"\u0000 A linear stability analysis is performed on two simplified models representing a one-dimensional flame between oxidizer and fuel reservoirs and a two-dimensional “edge-flame” between the same reservoirs but above a cold, inert wall. Comparison of the eigenvalue spectra for both models is performed to discern the validity of extending the results from the one-dimensional problem to the two-dimensional problem. Of primary interest is the influence on flame stability of thermal-diffusive imbalances, i.e. non-unity Lewis numbers. Flame oscillations are observed when Le > 1, and cellular flames are witnessed when Le < 1. It is found that when Le > 1 the characteristics of flame behavior are consistent between the two models. Furthermore, when Le < 1, the models are found to be in good agreement with respect to the magnitude of the critical wave numbers. Results from the coarse mesh analysis of the two-dimensional system are presented and compared to the one-dimensional eigenvalue spectra. Additionally, an examination of low reactant convection is undertaken. It is concluded that for low flow rates the behavior in one and two dimensions are similar qualitatively and quantitatively.","PeriodicalId":426926,"journal":{"name":"Heat Transfer: Volume 4 — Combustion and Energy Systems","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116001108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Heat Loss Analysis of Flamelets in Near-Limit Spread Over Solid Fuel Surfaces 火焰在固体燃料表面近极限扩散时的热损失分析

Heat Transfer: Volume 4 — Combustion and Energy Systems Pub Date : 2001-11-11 DOI: 10.1115/imece2001/htd-24252

R. Vance, I. Wichman

引用次数: 0

Effective Flux Temperature Formulation for Energy Conversion Using Microscale Thermal Radiation 微尺度热辐射能量转换的有效通量温度公式

Heat Transfer: Volume 4 — Combustion and Energy Systems Pub Date : 2001-11-11 DOI: 10.1115/imece2001/htd-24275

M. Whale

引用次数: 1

Radiation Heat Transfer to the Leeward Side of a Massive Object Suspended Over a Pool Fire 悬浮在水池火上的大质量物体背风面的辐射传热

Heat Transfer: Volume 4 — Combustion and Energy Systems Pub Date : 2001-11-11 DOI: 10.1115/imece2001/htd-24250

M. Kramer, M. Greiner, J. Koski

引用次数: 7

Steady-State Simulation of a Methane-Air Partially Premixed Turbulent Flame 甲烷-空气部分预混湍流火焰的稳态模拟

Heat Transfer: Volume 4 — Combustion and Energy Systems Pub Date : 2001-11-11 DOI: 10.1115/imece2001/htd-24233

G. Goldin, D. Choudhury

引用次数: 0