TY - JOUR
T1 - A numerical study on applying slot-grooved displacer cylinder to a Γ-type medium-temperature-differential stirling engine
AU - Chen, Wen Lih
AU - Chen, Chao Kuang
AU - Fang, Mao Ju
AU - Yang, Yu Ching
N1 - Funding Information:
This work was supported by the Ministry of Science and Technology, Taiwan, Republic of China , under the grant number MOST 105-2221-E-006-257 . The authors are very grateful for the financial support.
Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2018/2/1
Y1 - 2018/2/1
N2 - In this study, the effects of heat transfer enhancement on engine performance by introducing slot grooves on walls of the displacer cylinder of a γ-type medium-temperature-differential Stirling engine have been investigated using computational fluid dynamics. Cases include smooth displacer-cylinder wall with heat source and heat sink extension on displacer cylinder circumferential wall and slot-grooved displacer-cylinder walls with grooves at different locations and numbers. The grooves are at displacer cylinder circumferential wall or at top and bottom walls. The slot grooves are classified into three types according to their locations. It is found that the circumferential wall is very important on engine's heat transfer behavior. Extending heat source and heat sink on this wall can improve indicated power but losing efficiency. Type-1 grooves enhance both positive and inadequate heat transfer, hence its effects on enhancing engine performance is mixed. In contrast, Type-3 grooves mainly enhance positive heat transfer thus yield improvement on indicated power and efficiency as the number of grooves increases. However, Type-2 grooves, which enhance heat transfer on regenerative wall, have been shown to yield the best performance. Compared with the engine without any heat-transfer-enhancement measure, a case with 96 Type-2 grooves improves indicated power up to 49%.
AB - In this study, the effects of heat transfer enhancement on engine performance by introducing slot grooves on walls of the displacer cylinder of a γ-type medium-temperature-differential Stirling engine have been investigated using computational fluid dynamics. Cases include smooth displacer-cylinder wall with heat source and heat sink extension on displacer cylinder circumferential wall and slot-grooved displacer-cylinder walls with grooves at different locations and numbers. The grooves are at displacer cylinder circumferential wall or at top and bottom walls. The slot grooves are classified into three types according to their locations. It is found that the circumferential wall is very important on engine's heat transfer behavior. Extending heat source and heat sink on this wall can improve indicated power but losing efficiency. Type-1 grooves enhance both positive and inadequate heat transfer, hence its effects on enhancing engine performance is mixed. In contrast, Type-3 grooves mainly enhance positive heat transfer thus yield improvement on indicated power and efficiency as the number of grooves increases. However, Type-2 grooves, which enhance heat transfer on regenerative wall, have been shown to yield the best performance. Compared with the engine without any heat-transfer-enhancement measure, a case with 96 Type-2 grooves improves indicated power up to 49%.
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U2 - 10.1016/j.energy.2017.12.010
DO - 10.1016/j.energy.2017.12.010
M3 - Article
AN - SCOPUS:85038871146
SN - 0360-5442
VL - 144
SP - 679
EP - 693
JO - Energy
JF - Energy
ER -