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

流体力学研究的目的是增加 内燃机输出功率和燃油经济性 通过检查发动机内部的精确流量， 进入的空气和燃料的混合物 更好的混合意味着 燃料燃烧更完全，这也意味着更安全 排放 发动机流动的流体力学的最新技术 特别是在获取重要信息方面受到限制 重分级流体湍流。 一种新技术已经被开发出来 在密歇根州立大学， 在发动机中形成交叉线的网格。 与 这项新技术广泛应用于发动机诊断和流体 机械将被执行。 使用中的速度梯度 区域的网格获得的新技术，应变 速率和涡量将被确定。 内部 发动机设计将受益于使用这些数量，因为它将 可以优化汽缸的燃烧气体的清除 并最小化与燃烧的装料的混合。 新技术 为空气的预燃烧混合提供了改进的可能性， 和燃料。

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.