| Comparison of the Thermal Performance of Recuperators with Corrugated Fins for a 500W Class Micro Gas Turbine Generator |
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Kyu Hyung Do, Tae Hoon Kim, Yong-Shik Han, Byung-Il Choi, Myung Bae Kim |
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KIMM |
| 500W 급 마이크로 가스터빈을 위한 파형 휜을 가지는 리큐퍼레이터의 열성능 비교 |
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도규형, 김태훈, 한용식, 최병일, 김명배 |
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한국기계연구원 |
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| Abstract |
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In this study, thermal performance of recuperators with plain and offset strip fins is investigated to enhance the thermal efficiency of a micro gas turbine. Thermal cycle analysis is conducted to determine major design parameters of a single-pass counterflow recuperator. In order to evaluate the performance of the recuperator, the effectiveness and the pressure drop in the recuperators are chosen as the objective function and the design constraint, respectively. The optimized geometries for internal structure of the recuperators with plain and offset strip fins are obtained with varying the fin spacing and height. From the result, the recuperator with offset strip fins has better thermal performance when the fin spacing, s, is smaller than 1.45mm and the thermal performance of the recuperator with plain rectangular fins is higher than that with offset strip fins in the region of $s{geq}1.45mm$. In addition, it is found that the entrance region effect and the longitudinal wall heat conduction effect should be taken into account for accurately predicting the thermal performance of the recuperators with both plain and offset strip fins. |
| Key Words:
Micro Gas Turbine, Counterflow Recuperator, Corrugated Fin, Thermal Optimization |
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