Presidential Young Investigators Award: Engine Heat Transfer and Combustion Studies

总统青年研究员奖：发动机传热和燃烧研究

• 批准号: 8858310
• 负责人: Dionissios Assanis
• 金额: $ 31.2万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-07-01 至 1993-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8858310&HistoricalAwards=false
• 关键词: Presidential; Young; Investigators; Award; Engine

A single-cylinder research engine will be instrumented for measurements of instantaneous wall surface temperatures, convective and radiative heat fluxes, combustion chamber pressure and other pertinent flow-field parameters, and exhaust emissions. The results will be used to develop a new generation of multi-dimensional process models which will be suitable for realistic simulation of Low-Heat Rejection (LHR) and conventional engines using available supercomputers. The basis for these models will be the Los Alamos Kiva-II program which can provide a detailed knowledge of in-cylinder fluid and combustion processes. Improved gas-to-wall heat transfer models will relate boundary layer phenomena to turbulence and combustion processes and in-cylinder radiation to soot dynamics. Multi-dimensional finite element descriptions of the combustion chamber components will also be incorporated into the code. Thus, cyclically-varying gas-to-wall heat transfer phenomena, transient heat conduction inside the components, unsteady boundary layer and deposit characteristics, and engine combustion and emissions phenomena will be studied. The proposed engine heat transfer and combustion studies will enhance our basic understanding of the unsteady thermal phenomena in conventional and LHR engine combustion chambers. This new knowledge will be used to optimize the performance and emissions trade-offs resulting from the introduction of ceramic materials, advanced component designs, and new fuels and lubricants in the engine combustion chamber. The experimental studies will also provide realistic boundary conditions which will be used in our analytical models to predict transient temperature distributions, thermal stress levels, and lubrication requirements of conventional and LHR combustion chamber components. This coordinated research effort which takes advantage of advanced instrumentation and ever-increasing computer capability can make a substantial contribution in our efforts to produce more fuel efficient engines with acceptable emissions characteristics.

一台单缸研究发动机将被安装在仪器上， 瞬时壁面温度测量，对流 以及辐射热通量、燃烧室压力和其他 相关的流场参数和废气排放。 结果 将用于开发新一代的多维过程 模型，这将是适合现实模拟低热量 抑制（LHR）和传统发动机使用可用的 超级计算机 这些模型的基础将是洛斯阿拉莫斯 Kiva-II程序，可提供详细的缸内知识 流体和燃烧过程。 改进的气体到壁的传热 模型将把边界层现象与湍流联系起来， 燃烧过程和缸内辐射到碳烟动力学。 燃烧的多维有限元描述 该守则亦会包括分庭的组成部分。 因此，在本发明中， 循环变化的气体-壁面传热现象，瞬态热 部件内部传导、非定常边界层和存款 特性，以及发动机燃烧和排放现象将是 研究了 拟议的发动机传热和燃烧研究将提高 我们对非稳态热现象的基本理解 传统和LHR发动机燃烧室。 这些新知识 将用于优化性能和排放权衡 由于陶瓷材料的引入，先进的 部件设计，以及发动机中的新燃料和润滑油 燃烧室 实验研究还将提供 实际边界条件，将用于我们的分析 预测瞬态温度分布、热应力 常规和LHR的水平和润滑要求 燃烧室组件 这种协调的研究努力， 利用先进的仪器和不断增加的 计算机能力可以在我们的努力中做出重大贡献 以生产更省油的发动机， 特色