A CFD parametric study on the performance of a low-temperature-differential γ-type Stirling engine
A CFD parametric study on the performance of a low-temperature-differential γ-type Stirling engine
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低温差γ型斯特林发动机性能CFD参数研究
DOI：
10.1016/j.enconman.2015.10.007
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发表时间：
2015
影响因子：
10.4
通讯作者：
J. L. Salazar
中科院分区：
文献类型：
--
作者：
W. L. Chen;Yu;J. L. Salazar
将内部CFD程序应用于低温差动(LTD)γ斯特林发动机，以了解几个几何参数和运行参数对发动机性能的影响。结果包括发动机循环内的压力、温度和传热率的变化，以及发动机的功率和效率随这些参数的变化。研究发现，动力活塞行程和半径对发动机性能的影响非常相似，功率和效率都随着这两个参数的增加而增加。实际上，这两个参数的影响可以归结为压缩比参数的影响。结果表明，置换器冲程对热输入影响较大，但对功率影响较小，从而导致效率随冲程增大而降低。正如预期的那样，功率和效率都随着热端和冷端之间的温差增加而增加。最后，发动机转速对功率有较强的正向影响，但对效率的影响较小。这项研究揭示了几个重要参数对发动机性能的影响，这些信息对LTD斯特林发动机的设计非常有用。
An in-house CFD code has been applied to a low-temperature-differential (LTD)γ-type Stirling engine to understand the effects posed by several geometrical and operational parameters on engine performance. The results include variations of pressure, temperature, and heat transfer rates within an engine cycle as well as variations of engine’s power and efficiency versus these parameters. It is found that power piston stroke and radius influence engine performance very similarly, and power and efficiency both increase as these two parameters increase. In fact, the effects of the two parameters can be assimilated into those by the parameter of compression ratio. The stroke of displacer is observed to affect strongly on heat input but weakly on power, thus causing the efficiency to decrease as it increases. As expected, both power and efficiency increase as temperature difference between the hot and cold ends increases. Lastly, engine speed is observed to pose strong positive effects on power but exert weak effects on efficiency. This study reveals the effects produced by several important parameters on engine performance, and such information is very useful for the design of new LTD Stirling engines.