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Historical, analytical, and experimental investigation of internal combustion, liquid piston pumping engines.

机译：内燃机，液体活塞泵发动机的历史，分析和实验研究。

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摘要

The internal combustion liquid piston engine (ICLPE) is a very simple internal combustion engine which utilizes an oscillating column of water to replace many of the moving components in standard engine/pump arrangements. The engines are usually configured for pumping water, and have the potential to be one of the most efficient and reliable methods available for high volume, low head pumping. Large ICLPEs have been proposed for low-cost pumping in industrialized regions, and small ICLPEs are being considered for use in developing countries. An investigation was conducted in order to determine the major factors influencing the design of ICLPEs. The investigation included an in-depth historical review, analytical studies, and design and construction of an experimental engine. The historical review revealed that some four-stroke ICLPEs (four-stroke ICLPEs are commonly referred to as Humphrey Pumps) built early in the century had excellent efficiency and a service life of over fifty years, although the power density was low. Several two stroke configurations are proposed in order to increase the power density. A discussion of social and technical factors affecting the use of the ICLPE in developing countries is presented. A discussion of the thermodynamics of the ICLPE is presented, concluding that previous efficiency formulations may lead to significant errors, and that entrained water may have a significant effect on engine thermodynamics. The bond graph modeling technique was used to simulate the performance of a proposed two-stroke engine, and results of a parametric simulation study are presented. Results indicate that the model is a good qualitative predictor of the process but overpredicts peak pressures, output work, and efficiency. An experimental engine was built which operates on a new two-stroke cycle and incorporates a transparent combustion chamber with a 7.5 inch bore and 6 foot stroke. Design issues are discussed. Results from the experimental engine are presented and indicate that Rayleigh-Taylor surface instabilities can have a strong influence on engine performance as the power density is increased.
机译：内燃液体活塞式发动机（ICLPE）是一种非常简单的内燃发动机，它利用振荡水柱来代替标准发动机/泵装置中的许多运动部件。发动机通常配置用于泵送水，并且有可能成为可用于大容量，低扬程泵送的最有效，最可靠的方法之一。对于工业化地区的低成本泵送，已经提出了大型ICLPE，而正在考虑将小型ICLPE用于发展中国家。为了确定影响ICLPE设计的主要因素，进行了调查。该调查包括深入的历史回顾，分析研究以及实验发动机的设计和制造。历史回顾表明，尽管功率密度低，但在本世纪初建造的一些四冲程ICLPE（四冲程ICLPE通常被称为Humphrey Pumps）具有出色的效率和超过五十年的使用寿命。为了提高功率密度，提出了几种两种冲程配置。讨论了影响发展中国家使用ICLPE的社会和技术因素。本文讨论了ICLPE的热力学，认为以前的效率公式可能会导致重大错误，并且夹带的水可能会对发动机的热力学产生重大影响。结合图建模技术被用来模拟所提出的二冲程发动机的性能，并给出了参数模拟研究的结果。结果表明，该模型是过程的良好定性预测指标，但过高预测了峰值压力，输出功和效率。建造了一个实验性发动机，该发动机以新的二冲程循环运行，并合并了一个透明燃烧室，该燃烧室具有7.5英寸的缸径和6英尺的冲程。讨论了设计问题。给出了实验发动机的结果，表明随着功率密度的增加，瑞利-泰勒表面不稳定性可能会对发动机性能产生重大影响。

著录项

  • 作者

    Willson, Bryan Dennis.;

  • 作者单位

    The University of Texas at Austin.;

  • 授予单位 The University of Texas at Austin.;
  • 学科 Mechanical engineering.
  • 学位 Ph.D.
  • 年度 1988
  • 页码 277 p.
  • 总页数 277
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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