Study of heat transfer in oscillatory flow for a Stirling engine heating tube inserted with spiral spring
Study of heat transfer in oscillatory flow for a Stirling engine heating tube inserted with spiral spring
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插入螺旋弹簧的斯特林发动机加热管振荡流传热研究
DOI：
10.1016/j.applthermaleng.2018.07.071
复制
发表时间：
2018-10
影响因子：
6.4
通讯作者：
Liu Wei
中科院分区：
文献类型：
--
作者：
Xin Feng;Liu Zhichun;Wang Si;Liu Wei
斯特林发动机的加热器将外部热源的热量传递给工作气体。提高其传热性能，有利于节约外部热源，降低发动机的死气量。研究了斯特林发动机加热器内螺旋弹簧管内往复振荡流动的流动和换热特性。结果表明：在本研究的参数范围内，增强管的努塞尔数（Nu）、摩擦系数(f)和性能评价指标（PEC）随螺旋高度(h)的增大而增大，随螺旋节距(p)的增大而减小。优化后的强化管PEC = 1.22，出口温度较光滑管有明显提高。最大改善为入程115 K，返程94 K，平均改善为入程64 K，返程34 K。与光滑管相比，优化后强化管的额外压力消耗小于0.0013 MPa，与加热管总压力（1.5 MPa类似于2.5 MPa）相比可以忽略不计。因此，在斯特林发动机中插入螺旋弹簧加热管的好处是显而易见的。
The heater of Stirling engine transfers heat from external heat sources to working gas. Improving its heat transfer performance is favourable to save external heat sources and decrease dead volume of engine. In this study, the flow and heat transfer characteristics of reciprocating oscillatory flow in a tube inserted with spiral spring in a Stirling engine heater were investigated. The results indicate that the Nusselt number (Nu), friction factor (f) and performance evaluation criterion (PEC) increased with spiral height (h) and decreased with spiral pitch (p) for enhanced tube within the range of parameters in this study. For the optimal enhanced tube, the PEC was equal to 1.22 and the outlet temperature was significantly improved compared to smooth tube. The maximum improvement was 115 K in entry process and 94 K in return process, and the average improvement was 64 K in entry process and 34 K in return process. The extra pressure consumption in the optimal enhanced tube was less than 0.0013 MPa compared to smooth tube, which could be negligible contrasting to the overall pressure in heating tube (1.5 similar to 2.5 MPa). Thus, the benefits are apparent for heating tube inserted with spiral spring in Stirling engine.
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