为了改变能源消费结构，保护生态环境，实现我国经济可持续发展，构建燃用清洁能源的分布式能源系统势在必行。本项目基于有限时间热力学、非平衡态热力学和强化传热理论，研究生物质斯特林循环分布式能源系统的基础理论和技术问题。首先，科学构建新的热力循环模型，合理表征斯特林机热力过程的不可逆性，将斯特林机热功转换过程与热量传递过程的分析耦合起来，在不同的优化准则下实现系统整体与加热器、冷却器、回热器等系统部件的协同优化。其次，基于核心流区扰流均温传热强化理论，提出交变工况下斯特林机加热器、冷却器、回热器的强化传热原则和方法，最大限度减少传递过程的不可逆损失，改善斯特林机性能，提高输出功率。最后，搭建基于生物质燃烧的斯特林机并进行系统实验研究，为在中国农村推广生物质斯特林机发电的新模式，解决秸秆田间焚烧的环境污染问题，提供可靠的实验依据。

To change the energy consumption structure, protect the ecological environment, and achieve the sustainable development of national economy, it is imperative to construct clean combustion-based distributed energy utilization systems. This project is dedicated to studying the fundamental theory and technical problems of high efficiency distributed Stirling engine system based on finite time thermodynamics, non-equilibrium thermodynamics and heat transfer enhancement theory. Firstly, in this project, a new cycle model will be constructed and the reasonable characterization of irreversible thermodynamic process of the Stirling engine will be further researched. Based on the combined analysis of the heat-work conversion process and energy transport process of the Stirling engine, collaborative optimization of the whole system and the system parts (such as heater, cooler and regenerator) will be investigated under different optimization criteria. In addition, based on the heat transfer enhancement theory of disturbed flow and equalized temperature in the core flow region, optimal design for heat transfer and flow characteristics of the heater, cooler and regenerator for the Stirling engines will be conducted to minimize the irreversible loss of transport process and improve the performance of the system, thereby to increase the power output. Furthermore, an experimental research on a biomass-based distributed Stirling engine system will be conducted systematically. It might serve as a solid experimental guidance for the alternative model of wide application of biomass-based Stirling engine in rural China to solve the environmental pollution problems originating from straw burning.