This paper presents a design for a novel, palm sized, high-aspect-ratio engine. To simplify fabrication and keep the device unobtrusive, a design incorporating a two-cycle engine having a flat, rectangular piston with spring return was selected. An experimental engine based on this concept producing a significant amount of useful work was developed. Although results were encouraging, this geometry raised many issues to be investigated and resolved, including the effects of piston sealing, scavenging, heat losses, and combustion efficiency. Due to the complex interplay between these effects, experimental investigation was time consuming and simple models were found to be inadequate. Therefore, a more complex theoretical model accounting for these effects was developed and used to evaluate the sensitivity of engine performance to each of these parameters. The predictions of this model were used to develop recommendations for improving the experimentally developed engine.

本文提出了一种新颖的手掌大小，高纵横比发动机的设计。为了简化制造并保持设备不引人注目，选择了一种设计，该设计结合了具有平整矩形活塞和弹簧复位功能的两冲程发动机。开发了基于此概念的实验引擎，可产生大量有用的工作。尽管结果令人鼓舞，但这种几何形状提出了许多需要研究和解决的问题，包括活塞密封，扫气，热量损失和燃烧效率的影响。由于这些效应之间复杂的相互作用，实验研究非常耗时，并且发现简单的模型是不够的。因此，开发了一个解释这些影响的更复杂的理论模型，并将其用于评估发动机性能对每个参数的敏感性。该模型的预测被用来为改进实验开发的发动机提供建议。