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Self-circulating flow in thermoacoustic heat engines for efficient heat transfer

热声热机中的自循环流可实现高效传热

基本信息

批准号：
532008-2018
负责人：
Rowe, AndrewMichael
金额：
$ 1.82万
依托单位：
University of Victoria
依托单位国家：
加拿大
项目类别：
Engage Grants Program
财政年份：
2018
资助国家：
加拿大
起止时间：
2018-01-01 至 2019-12-31
项目状态：
已结题

来源：
https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=663797
关键词：
Self circulating flow thermoacoustic heat

项目摘要

Thermoacoustic engines convert heat energy into high amplitude acoustic waves and subsequently into electric power. One of the advantages of this approach is that heat is converted to work with no moving parts which makes the engine reliable and maintenance free. Heat may be provided by combusting fuel such as natural gas or biomass, or by utilizing waste heat. The technology has significant potential for increasing energy system efficiency through waste-heat utilization for mobile, distributed, or remote combined heat and power generation.****For applications involving waste-heat utilization, efficient coupling of the thermal source to the engine is required. This can be difficult and costly using conventional heat exchangers. A simpler, and potentially efficient method to transport heat to the engine is using mean flow in a loop connecting the waste heat source to the thermoacoustic generator. The use of venturi structures to drive flow in a loop has been proven, but requires testing, characterization, and optimization for use in commercial applications. This project will experimentally and numerically analyze the impacts of venturi design and operating conditions of heat transfer effectiveness of a self-circulating flow loop. Preferred designs to create self-circulating flow will be identified.****

热声发动机将热能转化为高幅度声波，然后转化为电能。这种方法的优点之一是，热量在没有移动部件的情况下转换为工作，这使得发动机可靠且无需维护。热量可通过燃烧天然气或生物质等燃料或利用余热来提供。这项技术具有巨大的潜力，可以通过移动、分布式或远程联合发电的废热利用来提高能源系统的效率。*对于涉及废热利用的应用，需要将热源有效地耦合到发动机。使用传统的热交换器，这可能是困难和昂贵的。一种更简单、也是潜在有效的将热量输送到发动机的方法是使用环路中的平均流，将废热来源连接到热声发生器。使用文丘里结构来驱动回路中的流量已经得到证实，但需要进行测试、表征和优化才能用于商业应用。本项目将从实验和数值上分析文丘里管的设计和操作条件对自循环环路换热效果的影响。将确定创建自循环流动的首选设计。*