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Simulation of pressure imbalance phenomena in a double-acting α-cycle Stirling engine

机译：双作用α周期斯特林发动机中压力不平衡现象的模拟

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This article presents an exploratory process of finding root causes of an undesirable pressure imbalance in an industrial high temperature heat pump based on a reverse Stirling engine using a simulation model of the process. Different types of Stirling engine configurations can be used as heat engines converting heat to power or as heat pumps using power to raise the temperature of low temperature heat to a higher level. The studied heat pump has a double-acting alpha-configuration, with two double-acting pistons interacting with a working fluid on each piston face. Theoretically, this configuration creates two separate circuits, which can be treated in isolation of each other, but in practice, some working fluid will leak through the piston rings. A simulation model of the studied Stirling system using the software Simulink was developed to investigate to which degree such piston-ring leakages could affect system pressures. By modelling piston-ring leakage and experimenting with different combinations of model parameters, different types of effects on system pressures are seen in the simulations, offering explanations for pressure fluctuations observed in the real heat pump system. These pressure phenomena may well be present in other reciprocating systems, and identifying them is a first step in preventing them in order to increase system stability. An interesting observation was that the direction of the imbalance was not necessarily determined by the direction of the leak through the piston rings, but by the piston position at the onset of the leak. The simulation model is shown to be capable of reproducing complex patterns seen in the measurements of the real process by simple modifications and adaptation of model parameters.
机译：本文介绍了使用该工艺的仿真模型的基于反向斯特林发动机在工业高温热泵中寻找不良压力不平衡的根本原因的探索性过程。不同类型的斯特林发动机配置可以用作热风发动机将热量转换为电力或使用电力的热泵，以将低温热的温度提高到更高水平。研究的热泵具有双作用α配置，其中两个双作用活塞与每个活塞面上的工作流体相互作用。从理论上讲，这种配置产生两个单独的电路，这可以彼此隔离地处理，但在实践中，一些工作流体将通过活塞环泄漏。开发了使用软件Simulink的研究斯特林系统的仿真模型，以研究这种活塞环泄漏可能影响系统压力的程度。通过对活塞环泄漏和模型参数的不同组合进行建模，在模拟中可以看到不同类型的对系统压力的影响，为真正的热泵系统中观察到的压力波动提供了解释。这些压力现象可能存在于其他往复系统中，并且识别它们是防止它们以增加系统稳定性的第一步。有趣的观察是，不平衡的方向不一定通过活塞环的泄漏方向确定，而是通过活塞位置在泄漏的开始处。通过简单的修改和调整模型参数，模拟模型显示能够再现在实际过程测量中看到的复杂模式。

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