CAREER: Measurements of Subgrid-Scale Scalar Mixing to Study Large-Eddy Simulation of Turbulent Combustion

职业:亚网格尺度标量混合测量以研究湍流燃烧的大涡模拟

基本信息

  • 批准号:
    0093532
  • 负责人:
  • 金额:
    --
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2001
  • 资助国家:
    美国
  • 起止时间:
    2001-04-01 至 2007-08-31
  • 项目状态:
    已结题

项目摘要

This is an investigation of the subgrid-scale (SGS) mixing of conserved scalars which play a critical role in large-eddy simulation (LES) of nonpremixed turbulent combustion. Mixing of conserved scalars is generally considered to be dominated by a large-to-small-scale cascade process based on Kolmogorovs hypothesis. Current mixing models give qualitatively incorrect results for flows where the cascade process should dominate. Also, it is now recognized that large-scale velocity and scalar fields have significant influence on small-scale scalar mixing. In this project, the effects of the large-scale structure and of the cascade process on the filtered density function (the SGS distribution) of a conserved scalar is studied. High-resolution measurements of velocity and of conserved scalars are made in high-Reynolds-number turbulent jets with isotropic grid turbulence. Hot-wire and cold-wire arrays, particle image velocimetry (PIV), and planar laser Rayleigh scattering are used for the measurements. Issues in modeling the filtered density function of a conserved scalar and the filtered joint density function of a conserved scalar and its gradient are investigated. Both conventional statistical analyses and those based on conditional sampling and averaging are performed to investigate the effects of turbulent advection, turbulent strain and rotation, and molecular mixing on the filtered density function and other variables.
本文研究了在非预混湍流燃烧大涡模拟中起关键作用的守恒标量的亚网格尺度(SGS)混合。 基于柯尔莫哥洛夫假设,守恒标量的混合通常被认为是由大到小的级联过程所主导。 目前的混合模型给出了定性的不正确的结果,级联过程应该占主导地位的流量。 此外,现在人们认识到,大尺度的速度和标量场有显着的影响,小尺度标量混合。 在这个项目中,大尺度结构和级联过程对保守标量的过滤密度函数(SGS分布)的影响进行了研究。 高分辨率的速度和守恒标量的测量在高雷诺数湍流射流与各向同性网格湍流。 热线和冷线阵列,粒子图像测速(PIV),和平面激光瑞利散射用于测量。 研究了守恒标量的滤波密度函数和守恒标量及其梯度的滤波联合密度函数的建模问题。 传统的统计分析和那些基于条件采样和平均进行调查的影响,湍流平流,湍流应变和旋转,和分子混合的过滤密度函数和其他变量。

项目成果

期刊论文数量(0)
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Chenning Tong其他文献

Scaling of high-Rayleigh-number convection based on internal convective boundary layer
  • DOI:
  • 发表时间:
    2024-03
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Chenning Tong
  • 通讯作者:
    Chenning Tong
Two-point coherence in the atmospheric surface layer
  • DOI:
    10.1007/bf00119061
  • 发表时间:
    1996-11-01
  • 期刊:
  • 影响因子:
    2.200
  • 作者:
    Chenning Tong;J. C. Wyngaard
  • 通讯作者:
    J. C. Wyngaard
Taylor’s hypothesis and two-point coherence measurements
  • DOI:
    10.1007/bf02430337
  • 发表时间:
    1996-12-01
  • 期刊:
  • 影响因子:
    2.200
  • 作者:
    Chenning Tong
  • 通讯作者:
    Chenning Tong
Investigation of subgrid-scale mixing of reactive scalar perturbations from flamelets in turbulent partially premixed flames
  • DOI:
    10.1016/j.combustflame.2015.07.048
  • 发表时间:
    2015-11-01
  • 期刊:
  • 影响因子:
  • 作者:
    Shuaishuai Liu;Chenning Tong
  • 通讯作者:
    Chenning Tong
The Effects of Probe-Induced Flow Distortion on Velocity Covariances: Field Observations
  • DOI:
    10.1023/a:1001868030313
  • 发表时间:
    1999-06-01
  • 期刊:
  • 影响因子:
    2.200
  • 作者:
    David O. Miller;Chenning Tong;John C. Wyngaard
  • 通讯作者:
    John C. Wyngaard

Chenning Tong的其他文献

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{{ truncateString('Chenning Tong', 18)}}的其他基金

EAGER: Experimental investigation of physical-space scalar structure and unresolved mixing to improve large-eddy simulation of turbulent combustion
EAGER:物理空间标量结构和未解决的混合的实验研究,以改进湍流燃烧的大涡模拟
  • 批准号:
    2208136
  • 财政年份:
    2022
  • 资助金额:
    --
  • 项目类别:
    Standard Grant
Collaborative Research: Theoretical and observational investigations of multi-point Monin-Obukhov similarity in the convective atmospheric surface layer
合作研究:对流大气表层多点莫宁-奥布霍夫相似性的理论和观测研究
  • 批准号:
    2054983
  • 财政年份:
    2021
  • 资助金额:
    --
  • 项目类别:
    Continuing Grant
Multi-Point Monin-Obukhov Similarity and Spectral Dynamics in the Convective Atmospheric Surface Layer
对流大气表层的多点Monin-Obukhov相似性和光谱动力学
  • 批准号:
    1561190
  • 财政年份:
    2016
  • 资助金额:
    --
  • 项目类别:
    Continuing Grant
Modeling of the Subgrid-scale Pressure-Strain-Rate Correlation in the Atmospheric Surface Layer
大气表层亚网格尺度压力-应变-速率相关性的建模
  • 批准号:
    1335995
  • 财政年份:
    2013
  • 资助金额:
    --
  • 项目类别:
    Continuing Grant
Experimental Investigation of Multiscalar Subgrid-Scale Mixing and Turbulence-Chemistry Interaction
多标量亚网格尺度混合和湍流-化学相互作用的实验研究
  • 批准号:
    1333489
  • 财政年份:
    2013
  • 资助金额:
    --
  • 项目类别:
    Standard Grant
Collaborative Research: Measurements and Modeling of Subgrid-scale Turbulence in the Atmospheric Surface Layer
合作研究:大气表层亚网格尺度湍流的测量和建模
  • 批准号:
    0638392
  • 财政年份:
    2007
  • 资助金额:
    --
  • 项目类别:
    Continuing Grant
Collaborative Research:Subgrid-Scale Mixing Models for Large Eddy Simulation of Turbulent Flames
合作研究:湍流火焰大涡模拟的亚网格尺度混合模型
  • 批准号:
    0651174
  • 财政年份:
    2007
  • 资助金额:
    --
  • 项目类别:
    Continuing Grant
Investigation of Subgrid-Scale Turbulence in the Atmospheric Surface Layer Using Field Measurement Data
使用现场测量数据研究大气表层亚网格尺度湍流
  • 批准号:
    0222421
  • 财政年份:
    2002
  • 资助金额:
    --
  • 项目类别:
    Continuing Grant

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