斯特林发动机的绝热分析

用绝热分析法建立并模拟了斯特林循环的理想绝热模型,仿真结果显示,增大循环压力能提高斯特林发动机的做功能力,这为以后建立非理想绝热模型和节点分析模型奠定了基础.     

斯特林发动机传热特性的研究

过去对斯特林发动机进行传热分析和模拟计算时,均采用稳定流动状况下的准则公式,因而带来较大的误差。为此,本文对斯特林发动机的非稳定传热特性进行了理论分析和试验研究,并整理出在低雷诺数下的准则公式。     

太阳能斯特林发动机

1988年5月18日,萨格勒布大学热力学和力学研究所教授依伏·科林,在联邦德国太阳能学会慕尼黑分会组织的报告会上,作了关于太阳能斯特林发动机的演讲。200多名听众感到极大兴趣。现在综述如下,以飨读者。 1816年一家由詹姆斯·斯特林——工程师和罗伯特·斯特林——     

斯特林发动机动态特性的研究

建立了斯特林发动机动态系统的非线性数学模型,模型包括：发动机本体模型,温度控制模型,功率控制模型,负载模型等。     

碟式斯特林发动机的研究进展

太阳能的利用和斯特林发动机的研发符合目前解决全球能源危机问题的需要。对斯特林热机的发展过程和循环工作原理进行了总结,综述了国内外对于碟式斯特林发电技术的应用现状,归纳了碟式斯特林发电系统中太阳光跟踪控制系统、接收器聚热技术、斯特林发动机功率控制技术和斯特林发动机密封技术等关键技术的研究成果和应用现状,总结并展望了碟式斯特林发电技术的发展重心,为进一步的研究工作提供参考。     

太阳能斯特林发动机的性能模拟

太阳能盘式聚光器和斯特林发动机能够很好地结合成为一种新型的具有广阔应用前景的动力系统，其性能研究和开发利用受到世界许多国家的重视。该文以等温模型为基础，考虑各部件中的工质流动损失、导热损失及活塞的穿梭和泵气热损失等，对一个低压无转速调节装置的盘式聚光器—斯特林发动机在一典型晴天日照下的一天中热性能进行模拟。结果显示；早晨接收器的温度随太阳辐射的增加迅速上升，输出功率和系统效率也快速增加，而后接收器的温度基本处于恒定，因而膨胀腔的膨胀功不变，接受器接收太阳辐射的增加使斯特林发动机的转速上升。流动阻力及各种热损失占膨胀功的比例随转速的升高越来越大，在上午10～12点时，输出功率又略有下降，而下午又正相反。因此，一天中的系统效率曲线呈一马鞍形。此外，结果也显示，提高发动机的工质压力。系统效率也将升高。     

关于斯特林发动机和节能

本文首先介绍了斯特林发动机作为外燃机具有的燃料多样化，效率高，噪音和污染小等特点，接着叙述了它的发明，开发经国际上的应用现状，特别是日本月光计划的开发应用现状。     

斯特林发动机的等温模型分析

阐述了用等温分析法研究了热源温度、死区容积比、回热器有效性及热源温差和冷源温差等五个因子对斯特林发动机性能的影响.研究结果表明:发动机的性能随热源温度的增加而提高,热源温度越高,这种关系越弱;由于各种损失的存在,死区容积比有最佳值;回热器有效性是影响发动机性能的一个重要因子,提高回热器的有效性,是提高发动机性能的一个有...     

斯特林发动机润滑系统模拟分析

应用专业管路仿真软件对某斯特林发动机润滑系统进行了管路模拟分析。计算得到了满足曲轴箱润滑要求的油泵背压;并分别讨论了不同设计参数变化对管路系统的影响。分析表明:单位体积流量的变化,直接决定了背压大小,二者之间存在很好的线性关系;当滤清器过滤面的等效直径大于前端进口管路直径时,过滤面积的大小并不会对系统产生太大的影响;转轴转速的变化,对油泵背压的影响可忽略。     

Twin cylinder alpha stirling engine combined model and prototype redesign

This article shows the development of a twin cylinder alpha type Stirling engine model, as well as the redesign of a prototype, its manufacture and preliminary results. The mechanical model is coupled with a thermodynamic model which allows an analysis and comparison of the theoretical and experimental behavior of the machine and a better understanding of the whole process. On the other side, a prototype redesign is presented. Thermal circuit was improved in order to eliminate losses, reduce dead volumes and improve heat transfer to the working fluid. Modifications of the seal system and the pistons design are included as well. An equation for the sizing of the flywheel is developed and finally the results obtained in tests between the new and the previous design are compared.     

Study of a Stirling engine used for domestic micro‐cogeneration. Thermodynamic analysis and experiment

One of the aims of this work is the study of the geometry of a micro‐cogenerator using a Stirling engine with four double effect pistons. The complex geometry of the heat exchangers was determined by optical measurements. Results of three thermodynamic models: Direct Method from Finite Speed Thermodynamics (FST), isothermal model (Schmidt), and adiabatic model (Finkelstein) are confronted to experimental ones. Direct Method consists of the study and the evaluation of the irreversibilities of thermal machines by analyzing the cycle, step by step, and directly integrating the equation of the First Law for processes with finite speed combined with Second Law of Thermodynamics, for each process of the cycle. The expression of efficiency and power, depending on the speed of the processes and geometric and functional parameters, is then obtained in a straightforward manner. The isothermal and adiabatic models are based on the division of Stirling engine in 3, respectively 5 control volumes, for which the ideal gas law and the equations of mass and energy balance are applied. Analysis of the process of heat transfer and flow of the working gas, taking place in the Stirling engine, is carried out taking into account instantaneous representation of the working fluid volume in the engine. A system of differential equations is solved by iteration using Matlab/Simulink software. The theoretical results are compared to experimental ones. This comparison allows to point out a good accuracy of the Direct Method and the Adiabatic Model, for the thermal operating parameters of the system, noting the different assumptions of each analysis. Copyright © 2015 John Wiley & Sons, Ltd.     

Efficiency bound of a solar-driven stirling heat engine system

A solar-driven Stirling engine is modelled as a combined system which consists of a solar collector and a Stirling engine. The performance of the system is investigated, based on the linearized heat loss model of the solar collector and the irreverisible cycle model of the Stirling engine affected by finite-rate heat transfer and regenerative losses. The maximum efficiency of the system and the optimal operating temperature of the solar collector are determined. Moreover, it is pointed out that the investigation method in the present paper is valid for other heat loss models of the solar collector as well, and the results obtained are also valid for a solar-driven Ericsson engine system using an ideal gas as its engine work substance. © 1998 John Wiley & Sons, Ltd.     

不同优化准则下斯特林发动机的性能分析

应用有限时间热力学原理.建立了一个考虑热阻、热漏和回热损失等不可逆因素的斯特林发动机模型;推导了最大输出功率、最大效率和生态学优化准则下,斯特林发动机性能的表达式;比较了三种优化准则下,热漏系数和回热器有效性对斯特林发动机性能的影响.研究表明:对热漏损失和回热损失较大的斯特林发动机,宜选用生态学优化准则.为斯特林发动机...     

A miniature thermoacoustic stirling engine

A miniature thermoacoustic stirling engine was simulated and designed, having overall size of length 0.65 m and height of 0.22 m. The acoustic field generated in this miniature system has been described and analyzed. Some efforts had been paid to coupling and matching, and a miniature thermoacoustic engine and some extra experimental components have been constructed. Analysis and experimental results showed that to obtain better performance of the engine, the diameter of the resonance tube must be chosen appropriately according to the looped tube dimension and the input heating power. It provided an effective way to miniaturize the thermoacoustic stirling heat engine. The experimental results showed that the engine had low onset temperature and high pressure amplitude and ratio. With the filling helium gas of 2 MPa and heating power of 637 W, the maximal peak to peak pressure amplitude and pressure ratio reached 2.2 bar and 1.116, respectively, which was able to drive a refrigerator, a heat pump or a linear electrical generator. The operating frequency of the engine was steady at 282 Hz.     

Numerical prediction of the instantaneous regenerator and in-cylinder heat transfer of a stirling engine

The paper is concerned with the study of the effects of the in-cylinder and regenerator heat transfer characteristics of a single-acting opposed-piston Stirling engine, with heater and cooler both omitted, for which a simulation model has been developed. The engine thermodynamic cycle is divided into a number of time-steps, and a system of nonlinear ordinary differential equations, which describe the energy balances over the three basic control volumes (hot and cold cylinders and regenerator), is solved numerically. Empirical correlations are used to determine the instantaneous heat transfer coefficients in the regenerator (flow across a porous medium) and inside the cylinder space (gas confined in a cylindrical volume with a moving boundary). Numerical results from the model are presented.     

Nodal analysis of a Stirling engine with concentric piston and displacer

To reduce the external volume of Stirling engines and to increase the specific power per unit volume, a novel mechanical arrangement is used where the power cylinder is concentrically situated inside the displacer cylinder. The inner heat transfer surface requirement and the thermodynamic performance characteristics are predicted preparing a nodal analysis in FORTRAN, where the inner volume of the engine is divided into 103 cells. Variation of the temperature in cells is calculated using the first law of thermodynamics, given for unsteady open systems, after arranging the enthalpy inflow and outflow terms. Volumes of cells are calculated using kinematic relations devised for the driving mechanism.The analysis indicates that the heats received from and delivered to the regenerator are not equal to each other. Therefore, the ends of the regenerator should be coupled with a heater and a cooler. The maximum thermal efficiency appears at the minimum mass of working fluid as the minimum thermal efficiency appears at the maximum mass of working fluid. The work increases up to a certain value of working fluid and then decreases. The thermal efficiency increases until a certain value of regenerator area and then decreases as well. Fluid temperature in the hot volume and cooler differs from the wall temperature at significant rates.     

Thermodynamic analysis of a Stirling engine including dead volumes of hot space, cold space and regenerator

This paper provides a theoretical investigation on the thermodynamic analysis of a Stirling engine. An isothermal model is developed for an imperfect regeneration Stirling engine with dead volumes of hot space, cold space and regenerator that the regenerator effective temperature is an arithmetic mean of the heater and cooler temperature. Numerical simulation is performed and the effects of the regenerator effectiveness and dead volumes are studied. Results from this study indicate that the engine net work is affected by only the dead volumes while the heat input and engine efficiency are affected by both the regenerator effectiveness and dead volumes. The engine net work decreases with increasing dead volume. The heat input increases with increasing dead volume and decreasing regenerator effectiveness. The engine efficiency decreases with increasing dead volume and decreasing regenerator effectiveness.     

斯特林发动机在能源利用领域中的应用

斯特林发动机具有燃料多样性、效率高等特点,对于促进能源的综合利用、减少环境污染具有重要的意义。提出了斯特林发动机推广应用的领域,并通过与燃气锅炉在初投资和运行费用方面进行比较,分析了斯特林发动机未来的发展趋势。