Heat transfer and pressure drop in pin-fin trapezoidal ducts
- Chung-Hua Univ., Hsinchu (Taiwan, Province of China). Dept. of Mechanical Engineering
Experiments are conducted to determine the log-mean averaged Nusselt number and overall pressure-drop coefficient in a pin-fin trapezoidal duct that models the cooling passages in modern gas turbine blades. The effects of pin arrangement (in-line and staggered), flow Reynolds number (6,000 {le} Re {le}40,000) and ratio of lateral-to-total flow rate (0 {le} {var_epsilon} {le} 1.0) are examined. The results of smooth trapezoidal ducts without pin arrays are also obtained for comparison. It is found that, for the single-outlet-flow duct, the log-mean averaged Nusselt number in the pin-fin trapezoidal duct with lateral outlet is insensitive to the pin arrangement, which is higher than that in straight-outlet-flow duct with the corresponding pin array. As for the trapezoidal ducts having both outlets, the log-mean averaged Nusselt number has a local minimum value at about {var_epsilon} = 0.3. After about {var_epsilon} {ge} 0.8, the log-mean averaged Nusselt number is nearly independent of the pin configuration. Moreover, the staggered pin array pays more pressure-drop penalty as compared with the in-line pin array in the straight-outlet-flow duct; however, in the lateral-outlet-flow duct, the in-line and staggered pin arrays yield almost the same overall pressure drop.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 351622
- Report Number(s):
- CONF-980615-; ISSN 0889-504X; TRN: IM9927%%147
- Journal Information:
- Journal of Turbomachinery, Vol. 121, Issue 2; Conference: American Society of Mechanical Engineers (ASME) turbo expo `98 - land, sea, air, Stockholm (Sweden), 2-5 Jun 1998; Other Information: PBD: Apr 1999
- Country of Publication:
- United States
- Language:
- English
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