Optimization of geometrical parameters for Stirling engines based on theoretical analysis
Optimization of geometrical parameters for Stirling engines based on theoretical analysis
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DOI：
10.1016/j.apenergy.2011.11.046
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发表时间：
2012-04
期刊：
影响因子：
11.2
通讯作者：
Chin‐Hsiang Cheng;H. Yang
中科院分区：
文献类型：
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作者：
Chin‐Hsiang Cheng;H. Yang
从理论上分析了几何参数对斯特林发动机轴功的影响。在不同的工况下，得到了使发动机轴功最大的相位角和扫气容积比的最优组合。分析了机构效率、死容积比和温度比对发动机最大轴功的影响，以及相位角和扫气容积比的最佳组合。本文还对α、β和γ型三种斯特林发动机的性能进行了理论分析，并对这三种发动机的相对性能进行了比较。结果表明，对于本研究中所考虑的特殊情况，β型斯特林发动机产生的轴功最高，γ型发动机产生的轴功最低。一般来说，γ型发动机必须是非常有效的机构，以便提供足够的轴功。然而，在三种类型的发动机中，γ型发动机最有能力在低温差下工作。相反，α型发动机的无因次轴功随着温度比的增大而逐渐消失，特别不适合于低温差的应用场合。
This study is aimed at theoretical analysis of the effects of the geometrical parameters on the shaft work of the Stirling engines. The optimal combination of the phase angle and the swept volume ratio, that leads to maximization of the shaft work of the engine, is obtained under different specified conditions. Effects of the effectiveness of mechanism, the dead volume ratio, and the temperature ratio on the maximum shaft work of the engine as well as the optimal combination of the phase angle and the swept volume ration are evaluated. Theoretical analysis of the performance of three types of Stirling engines, α-, β-, and γ-type, has also been carried out, and a comparison in relative performance among these three types of engines is attempted. Results show that for the particular cases considered in this study, the β-type Stirling engine produces highest shaft work and the γ-type engine the lowest. In general, the γ-type engine must be very mechanism effective so as to deliver sufficient shaft work. However, among the three types of engines, the γ-type engine is most capable of operating with low temperature difference. On the contrary, the α-type engine is particularly not suitable for the applications with low temperature difference since its dimensionless shaft work is found to gradually vanish as the temperature ratio is increased.