Thermoacoustic Phenomena in Small-Scale Systems

0853171 Matveev该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。紧凑型发电和制冷的一个有前途的候选者是集成了热源和电声Transformer的热声发动机。热声系统是环境友好的，高度可靠的，由于其简单的结构涉及最少数量的运动部件，并且可能是高效的。该项目的总体目标是了解振荡气体热力学和微型外壳中的传热的基本原理，为小规模能量转换开发有效的解决方案，并推进高性能能源系统的教育。智力优势：有证据表明，在热声装置中使用曲折多孔材料作为叠层或回热器可以提高小型热声系统的效率。为了理解振荡气体热力学和传热，并实现具有高性能的微型装置，需要进行基础研究，以解决小规模系统中的几个重要问题。这些问题包括热声在曲折多孔介质中的传输，系统元件中的声场和温度场的强非均匀性，粘性和热损失的减轻，以及与小热源和电声变压器的耦合。该研究涉及研究生和本科生，重点是：（1）小尺度热声现象的解析和数值分析，（2）小尺度系统特定条件下的宏观实验，以及（3）优化微型热声装置的小尺度测试。紧凑型热声能量转换装置的发展将使得能够实现各种小规模系统，例如MEMS、传感器网络、和无人驾驶车辆。热声系统也可用于废热回收和转换。在小尺度上对热声的进一步理解将有利于新兴的生物医学应用，如热声断层扫描和治疗。与研究相关的教育计划将提高能源领域的本科和研究生教育质量。这将通过将研究纳入课程和为暑期学校举办讲习班来实现。来自代表性不足群体的学生将被招聘为研究助理。研究成果和教育创新将通过出版物、互联网和暑期学校的短期课程传播。

0853171MatveevThis award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).A promising candidate for compact electricity generation and refrigeration is a thermoacoustic engine integrated with a heat source and an electroacoustic transformer. Thermoacoustic systems are environmentally friendly, highly reliable due to their simple structure involving a minimal number of moving parts, and potentially highly efficient. The general objectives of this project are to understand the fundamentals of oscillatory gas thermodynamics and heat transfer in miniature enclosures, to develop efficient solutions for small scale energy conversion, and to advance education in high performance energy systems. Intellectual Merit: There is evidence that use of tortuous porous materials as stacks or regenerators in thermoacoustic devices can raise the efficiency of small scale thermoacoustic systems. To understand the oscillatory gas thermodynamics and heat transfer, and implement miniature devices with high performance, fundamental research is required that addresses several problems important in small scale systems. These problems include thermoacoustic transport in tortuous porous media, strong non uniformity of acoustic and temperature fields in the system elements, mitigation of viscous and thermal losses, and coupling with small heat sources and electroacoustic transformers. The research involves graduate and undergraduate students and focuses on: (1) analytical and numerical analysis of small scale thermoacoustic phenomena, (2) macroscale experiments under conditions specific to small scale systems, and (3) small scale tests with optimized miniature thermoacoustic devices.Broader Impacts: The development of compact thermoacoustic energy conversion devices will enable implementation of a variety of small scale systems, such as MEMS, sensor networks, and unmanned vehicles. Thermoacoustic systems can also be used for waste heat recovery and conversion. Improved understanding of thermoacoustics at small scales will benefit emerging biomedical applications, such as thermoacoustic tomography and therapy. The educational plan related to the research will improve the quality of undergraduate and graduate education in the energy area. This will be done by integrating research into curricula and developing workshops for summer schools. Students from underrepresented groups will be recruited as research assistants. Research results and education innovations will be disseminated through publications, the internet, and in short courses during summer schools.