Experimental and Numerical Investigation of the Mechanisms of Local Extinction Using Flame Kernel-Vortex Interactions

利用火焰核-涡旋相互作用对局部消光机制进行实验和数值研究

基本信息

  • 批准号:
    0237406
  • 负责人:
  • 金额:
    $ 33万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Continuing Grant
  • 财政年份:
    2003
  • 资助国家:
    美国
  • 起止时间:
    2003-04-01 至 2007-03-31
  • 项目状态:
    已结题

项目摘要

Project SummaryThe objective of this research is to investigate, both experimentally and computationally, the local extinction processes occurring in premixed flames using a novel flame kernel-vortex configuration. The kernel-vortex interaction provides a rich configuration to study at least two important mechanisms responsible for extinction: flame-flow field topologies (curvature and strain); and flame-flame interactions (or mutual flame annihilation processes). Conditions of positive and negative unsteady strain rate and curvature may be generated simultaneously within the same interaction, providing the ideal condition for comparing the flame's response to different types of flame stretch. Moreover, the relative size of the expanding kernel to the vortex results in an evolving contribution of the vortex to flame wrinkling and its advection during the kernel evolution. The two complementary (experimental and computational) approaches are coordinated to provide improved understanding of the role of flame and flow field topologies (mainly unsteady strain and curvature effects) and mutual flame annihilations on local flame extinction, and to identify experimental observables that measure the local burning intensity in premixed hydrocarbon flames. Three important elements represent the main thrusts of thework and its technical merit: (1) An experimental study of extinction processes during flame kernel-vortex interactions. The study relies on a broad range of experimental conditions that span different flame and vortex strengths. Simultaneous measurements of intermediate species, temperature, and velocity provide a more robust link between flame and flow-field topologies and the local flame response; (2) Numerical studies of the general structure as well as the structure of two important regions in the flame kernels that are subject to quenching by unsteady strain or mutual flame annihilation. The numerical studies are used to identify relevant experimental conditions and explore, using detailed chemistry, the chemical mechanisms involved during extinction. Initial conditions for the detailed chemistry simulations are provided by the selected experimental conditions; and (3) The combined approaches provide complementary information to identify conditions and mechanisms for local extinction. An equally important endeavor is to use the simulations to identify candidate experimental observables that may be used to quantify the burning intensity of hydrocarbon premixed flames for unsteady and extinction conditions.Broader impactThe kernel-vortex offers a realistic and advantageous configuration to develop models for flame extinction that will be of value to our understanding of turbulent flames in general and turbulent kernels specifically, such as those observed in spark-ignited internal combustion engines and other practical combustion devices. The methodology proposed can have a broad impact on similar problems in combustion science and related areas of research where neither computational nor experimental approaches alone can adequately explain observations. The paradigm of coordinated experimental-computational approaches provides unique opportunities for the education of graduate students in both approaches as the project requires.
项目摘要本研究的目的是通过实验和计算来研究使用新型火焰核涡配置的预混合火焰中发生的局部消光过程。 核-涡相互作用提供了丰富的配置来研究至少两种导致消光的重要机制:火焰流场拓扑(曲率和应变); 和火焰-火焰相互作用(或相互火焰湮灭过程)。 正负不稳定应变率和曲率的条件可以在同一相互作用中同时生成,为比较火焰响应与不同类型的火焰拉伸提供了理想的条件。 此外,膨胀内核与涡流的相对大小导致涡流在内核演化过程中对火焰起皱及其平流的贡献不断变化。 这两种互补的(实验和计算)方法相互协调,以更好地理解火焰和流场拓扑(主要是非稳态应变和曲率效应)和相互火焰湮灭对局部火焰熄灭的作用,并确定测量预混合烃火焰中局部燃烧强度的实验可观测值。 三个重要元素代表了该工作的主要目标及其技术优点:(1)火焰核-涡旋相互作用期间消光过程的实验研究。 该研究依赖于涵盖不同火焰和涡流强度的广泛实验条件。 中间物质、温度和速度的同时测量提供了火焰和流场拓扑以及局部火焰响应之间更强大的联系; (2)一般结构以及火焰核中受非稳态应变淬火或相互火焰湮灭作用的两个重要区域的结构的数值研究。 数值研究用于确定相关的实验条件,并使用详细的化学方法探索灭绝过程中涉及的化学机制。 详细化学模拟的初始条件由选定的实验条件提供; (3) 综合方法提供补充信息,以确定局部灭绝的条件和机制。 同样重要的努力是利用模拟来确定候选实验观测值,这些观测值可用于量化不稳定和熄灭条件下碳氢化合物预混合火焰的燃烧强度。更广泛的影响内核涡提供了一种现实且有利的配置来开发火焰熄灭模型,这对于我们理解一般的湍流火焰和具体的湍流内核非常有价值,例如在 火花点火式内燃机和其他实用的燃烧装置。 所提出的方法可以对燃烧科学和相关研究领域的类似问题产生广泛的影响,在这些领域中,仅计算方法和实验方法都无法充分解释观察结果。 协调实验计算方法的范式为研究生根据项目需要的两种方法的教育提供了独特的机会。

项目成果

期刊论文数量(0)
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会议论文数量(0)
专利数量(0)

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William Roberts其他文献

AN UNUSUAL CASE OF SERIAL LEFT VENTRICULAR OUTFLOW OBSTRUCTION: COINCIDENT HYPERTROPHIC OBSTRUCTIVE CARDIOMYOPATHY AND SUBAORTIC MEMBRANE MANAGED OPERATIVELY
  • DOI:
    10.1016/s0735-1097(19)33333-9
  • 发表时间:
    2019-03-12
  • 期刊:
  • 影响因子:
  • 作者:
    Andy Lee;Aaron Mercado-Reza;Clay Barbin;Zachary Rosol;Nishi Patel;Ari Cedars;William Roberts;Robert Hebeler;Amarinder Bindra
  • 通讯作者:
    Amarinder Bindra
Pediatric Laboratory Medicine
儿科检验医学
  • DOI:
    10.1309/c52d-by0u-vxxu-r360
  • 发表时间:
    2002
  • 期刊:
  • 影响因子:
    0
  • 作者:
    C. Coffin;M. Hamilton;T. Pysher;P. Bach;E. Ashwood;Jeanne Schweiger;D. Monahan;Deborah A Perry;B. Rogers;C. Brugnara;J. Rutledge;R. Weiss;O. Ash;Harry Hill;W. Meikle;William Roberts;S. Geaghan
  • 通讯作者:
    S. Geaghan
Effects of a Unique Hematology-Oncology Pediatric Palliative Care Program On Medical Decision-Making and Communication Between Healthcare Providers and Families (733)
  • DOI:
    10.1016/j.jpainsymman.2011.12.211
  • 发表时间:
    2012-02-01
  • 期刊:
  • 影响因子:
  • 作者:
    Deborah Schiff;Cassie Kline;JoAnne Auger;Jennifer Willert;William Roberts;Anke Reineke
  • 通讯作者:
    Anke Reineke
ROLE OF HEART TRANSPLANT FOR VT ELECTRICAL STORM IN AN ORTHOTROPIC LIVER TRANSPLANTED PATIENT
  • DOI:
    10.1016/s0735-1097(20)33175-2
  • 发表时间:
    2020-03-24
  • 期刊:
  • 影响因子:
  • 作者:
    Justin Arunthamakun;Amit Alam;Joshua James Rutland;Alan Donsky;William Roberts;Melody Sherwood;Timothy Gong;Praveen Rao;Shelley Hall
  • 通讯作者:
    Shelley Hall
FULMINANT RHEUMATOID HEART DISEASE
  • DOI:
    10.1016/s0735-1097(19)33461-8
  • 发表时间:
    2019-03-12
  • 期刊:
  • 影响因子:
  • 作者:
    Jessica Meyer;Clay Barbin;S. Shiva Patlolla;Joseph Guileyardo;William Roberts;Georges Feghali
  • 通讯作者:
    Georges Feghali

William Roberts的其他文献

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{{ truncateString('William Roberts', 18)}}的其他基金

EFRI HyBi: Algal Oils to 'Drop-in' Replacements for Petroleum-derived Transportation Fuels
EFRI HyBi:藻油可“直接”替代石油衍生运输燃料
  • 批准号:
    0937721
  • 财政年份:
    2009
  • 资助金额:
    $ 33万
  • 项目类别:
    Standard Grant
Equipment to Sustain Combustion Research at NC State
北卡罗来纳州立大学维持燃烧研究的设备
  • 批准号:
    0111426
  • 财政年份:
    2001
  • 资助金额:
    $ 33万
  • 项目类别:
    Standard Grant
CAREER: Influence of Unsteady Stretch on Premixed Flame Kernel Growth
事业:不稳定拉伸对预混火焰核生长的影响
  • 批准号:
    9702277
  • 财政年份:
    1997
  • 资助金额:
    $ 33万
  • 项目类别:
    Standard Grant
Thyroid Hormone Effects on the Peripheral Olfactory System
甲状腺激素对周围嗅觉系统的影响
  • 批准号:
    9410637
  • 财政年份:
    1995
  • 资助金额:
    $ 33万
  • 项目类别:
    Standard Grant
SGER: Effects of Thyroxine on Peripheral Imprinting
SGER:甲状腺素对外周印记的影响
  • 批准号:
    9320702
  • 财政年份:
    1994
  • 资助金额:
    $ 33万
  • 项目类别:
    Standard Grant
CONNECTION to the INTERNET
连接到互联网
  • 批准号:
    9318077
  • 财政年份:
    1993
  • 资助金额:
    $ 33万
  • 项目类别:
    Standard Grant
Mathematical Sciences Computing Research Environments
数学科学计算研究环境
  • 批准号:
    9106029
  • 财政年份:
    1991
  • 资助金额:
    $ 33万
  • 项目类别:
    Standard Grant
Theoretical Studies of the Structure and Dynamics of Cloudy Interstellar Medium Spiral Galaxies
云状星际介质螺旋星系结构与动力学的理论研究
  • 批准号:
    8712084
  • 财政年份:
    1988
  • 资助金额:
    $ 33万
  • 项目类别:
    Continuing Grant
Acquisition of Mathematical Sciences Research Equipment
数学科学研究设备购置
  • 批准号:
    8304459
  • 财政年份:
    1983
  • 资助金额:
    $ 33万
  • 项目类别:
    Standard Grant
Galaxies, the Interstellar Medium, the External Environment:Galactic Gas Dynamics and Evolutionary Simulations
星系、星际介质、外部环境:星系气体动力学和演化模拟
  • 批准号:
    8204256
  • 财政年份:
    1982
  • 资助金额:
    $ 33万
  • 项目类别:
    Continuing Grant

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地质碳储存耦合过程的彻底实验和数值研究
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