热声热机系统的性能优化研究

发布时间：2018-01-23 00:15

本文关键词： 热声热机有限时间热力学新目标函数热力学循环优化　出处：《武汉工程大学》2014年硕士论文　论文类型：学位论文

【摘要】：热声热机是基于热声效应原理的一种全新的能源转换机械，由于其结构组成简单、使用寿命长、可靠性能高、能够利用低品质的能源实现废热的再利用以及工质采用的是对环境无污染，无损害的绿色环保气体，因此倍受学术界和工业界的关注。目前热声热机已成为国内、外一个研究热点。本文是在前人的研究基础之上，，将效率代替效率作为研究对象，运用有限时间热力学的方法，引入新的目标函数，对热声热机的输出声功率（或制冷率）和效率之间的关系进行优化研究，并且分析了各种外在、内在的影响因子对此优化关系的影响，以便对热声热机的理论和实际研究设计提供参考依据。本文主要的研究工作包括如下几部分： 1、分析与研究热声发动机的热力学性能。研究内容主要分为两部分，一是通过热声理论建立的热声热机微热力学循环，引入新的Z目标函数，运用有限时间热力学的方法，对内可逆即理想情况下和不可逆情况下热声发动机热声微热力循环的输出声功率和效率进行了优化分析研究；二是讨论了复指数传热规律下不可逆热声发动机的热力学循环，同样引入新的Z目标函数，运用有限时间热力学的方法对复指数传热规律下热声发动机的输出声功率和效率进行了优化分析研究。通过分析研究得出了热声发动机的输出声功率和效率均为同一中间变量的单值函数，并且存在一最优的中间变量，使得热声发动机的输出声功率和效率最优。 2、分析与研究了热声制冷机的热力学性能。研究内容同热声发动机，对复指数传热规律下的不可逆热声制冷机的循环模型中的制冷率和效率进行了优化分析研究。通过分析研究同样得出了复指数传热规律下的不可逆热声制冷机的制冷率和效率也均为同一中间变量的单值函数，并且存在一最优的中间变量，使得热声制冷机的制冷率和效率最优。 3、介绍了吴治教授及其团队设计和开发了一套人工智慧电脑辅助原动力厂设计软件（CyclePad）。利用该设计软件，通过图文并茂的形式，简单介绍了软件的各项功能与应用，并成功的模拟出了热声发动机微热力循环的理想循环Brayton-cycle。
[Abstract]:Thermoacoustic engine is a new energy conversion machine based on the principle of thermoacoustic effect, because of its simple structure, long service life and high reliability. Low quality energy can be used to achieve the reuse of waste heat and the use of working fluid is no pollution of the environment, no harm to the green gas. Therefore, it has attracted the attention of academia and industry. At present, thermoacoustic heat engine has become a research hotspot in China and abroad. In this paper, based on the previous studies, efficiency is taken as the object of study, and a new objective function is introduced by using the method of finite time thermodynamics. The relationship between the output acoustic power (or refrigeration rate) and the efficiency of thermoacoustic engine is optimized and the influence of various external and internal factors on the optimization relationship is analyzed. In order to provide a reference for the theoretical and practical research and design of thermoacoustic heat engine. The main research work of this paper includes the following parts: 1. The thermodynamics performance of thermoacoustic engine is analyzed and studied. The research is divided into two parts: one is the microthermodynamics cycle of thermoacoustic engine established by thermoacoustic theory, and the introduction of a new Z objective function. By using the finite time thermodynamics method, the output sound power and efficiency of thermoacoustic microthermal cycle of thermoacoustic engine under ideal and irreversible conditions are studied and optimized. Secondly, the thermodynamic cycle of irreversible thermoacoustic engine under the complex exponential heat transfer law is discussed, and a new Z objective function is also introduced. By using finite time thermodynamics, the output sound power and efficiency of thermoacoustic engine under the law of complex exponential heat transfer are optimized and studied. The results show that the output sound power and efficiency of thermoacoustic engine are as follows: 1. A single-valued function of the same intermediate variable. And there is an optimal intermediate variable, which makes the output sound power and efficiency of thermoacoustic engine optimal. 2Thermodynamic performance of thermoacoustic refrigerator is analyzed and studied. The refrigeration rate and efficiency in the cycle model of an irreversible thermoacoustic refrigerator under the complex exponential heat transfer law are studied and optimized. The irreversible thermoacoustic refrigerator under the complex exponential heat transfer law is also obtained through the analysis and study. The refrigeration rate and efficiency are also single-valued functions of the same intermediate variable. There is an optimal intermediate variable to optimize the refrigeration rate and efficiency of the thermoacoustic refrigerator. 3. Professor Wu Zhi and his team have designed and developed a set of artificial intelligence computer aided power plant design software, CyclePadn.Using this design software, through the form of picture and text. The functions and applications of the software are briefly introduced, and the ideal cycle Brayton-cycleof thermoacoustic engine microthermal cycle is successfully simulated.
【学位授予单位】：武汉工程大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB65

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