Research Initiation Award: Combustion in an Asymmetric Configuration

研究启动奖：不对称结构的燃烧

• 批准号: 9109778
• 负责人: Jean Hertzberg
• 金额: $ 8万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-06-01 至 1994-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9109778&HistoricalAwards=false
• 关键词: Research; Initiation; Award; Combustion; Asymmetric

The objective of this project is to understand the interaction of combustion and shear layer control techniques. The proposal is to study the fluid mechanics of combustion of a small aspect ratio rectangular channel sudden expansion. This configuration utilizes a combination of several control techniques. Active forcing will be used to drive the system's acoustic resonances and to organize the shear layer vortical structures for phase locked analysis. Passive forcing will be introduced via the configuration geometry; the elliptic vortex rings formed in the shear layer undergo self-induction, deforming the jet cross section and introducing transverse velocities not found in plane and axi-symmetric configurations. The approach is experimental, using laser doppler anemometry and flow visualization to examine the velocity field and premixed flame in a rectangular sudden expansion. The equivalence ratio will range from lean, where the stabilization of the flame in the shear layer downstream of the backward facing step is affected by the passive, active and three dimensional control techniques, to rich, where the flame/flow interaction is dominated by acoustic resonances. This will allow determination of the extent to which these control methods are effective in this configuration. The study will be initially limited to premixed combustion. The results can later be extended to address issues in nonpremixed combustion such as the optimization of fuel injection locations to take advantage of the flowfields produced by the control techniques. This research is expected to have a significant impact on combustion applications ranging from industrial pulse combustors and toxic waste incinerators to subsonic and supersonic combustion in ramjets. The understanding of the effects of shear layer control techniques on mixing and combustion can produce immediate results in increased combustion efficiency and control.

本项目的目的是了解 燃烧和剪切层控制技术。 的 建议是研究燃烧的流体力学， 小纵横比矩形通道突扩。 这 配置利用几种控制的组合， 技术. 主动强制将用于驱动系统的 声波共振和组织剪切层旋涡 用于锁相分析的结构。 被动强迫将是 通过配置几何引入;椭圆涡 在剪切层中形成的环经历自感应， 使射流横截面变形， 在平面和轴对称中未发现速度 配置. 该方法是实验性的，使用激光 多普勒风速仪和流动可视化检查 矩形突波流场与预混火焰 扩张. 当量比的范围将从贫，其中 下游剪切层中火焰的稳定 被动的，主动的 和三维控制技术，以丰富，其中 火焰/流动相互作用由声共振控制。 这将有助于确定在多大程度上， 控制方法在这种配置中是有效的。 的 研究最初将限于预混燃烧。 的 结果可以在以后扩展到解决非预混中的问题， 燃烧，如燃油喷射的优化 位置，以利用所产生的流场的 控制技术 这项研究预计将对 燃烧应用范围从工业脉冲 燃烧室和有毒废物焚化炉， 冲压式喷气发动机中的超音速燃烧。 的理解 剪切层控制技术对混合和 燃烧可以产生直接的结果， 燃烧效率和控制。