Enigneering Creativity Award: Fluid Mechaical Optimization of Two-Stroke Engines

工程创意奖：二冲程发动机流体机械优化

• 批准号: 8811647
• 负责人: Robert Falco
• 金额: $ 8.94万
• 依托单位: Michigan State University
• 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: 1988-09-01 至 1992-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8811647&HistoricalAwards=false
• 关键词: Enigneering; Creativity; Award; Fluid; Mechaical

The objective of this research in fluid mechanics is to increase the output and fuel economy of an internal combustion (IC) engine by examining the exact flow inside an engine thereby enhancing the mixture of the incoming air and fuel. Better mixing means more complete burning of the fuel which also implies safer emissions. Current techniques involving the fluid mechanics of engine flows are limited particularly in capturing important information regrading fluid turbulence. A new technique has been developed at Michigan State University involving a laser beam which is divided to form a grid of intersecting lines in the engine. With this new technique a wide variety of engine diagnostics and fluid mechanics will be performed. Using the velocity gradient in the region of the grid obtained by the new techniques, the strain rates and vorticity quantities will be determined. Internal engine design would benefit using these quantities since it would be possible to optimize scavenging of the cylinder of burnt gases and minimize mixing with the burnt charge. The new technique offers improved possibilities for pre-combustion mixing of air and fuel.

这项研究在流体力学方面的目的是通过检查发动机内部的精确流动，从而增强传入的空气和燃料的混合物，从而增加内燃机（IC）发动机的产量和燃油经济性。 更好的混合意味着对燃料进行更完整的燃烧，这也意味着更安全的排放。 当前涉及发动机流动力学的技术尤其是在捕获重要的信息重新加速流体湍流时受到限制。 密歇根州立大学已经开发了一种新技术，该技术涉及激光束，该激光梁被分开以形成发动机中相交线的网格。 有了这项新技术，将执行各种发动机诊断和流体机械师。 使用新技术获得的网格区域中的速度梯度，将确定应变速率和涡度数量。 内部发动机设计将使用这些数量受益，因为可以优化对燃烧气体的气缸进行清除，并最大程度地减少用燃烧电荷的混合。 新技术为空气和燃料的预燃烧混合提供了改进的可能性。