Journal of the Korean Society for Aviation and Aeronautics (한국항공운항학회지)
- Volume 14 Issue 1
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- Pages.9-14
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- 2006
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- 1225-9705(pISSN)
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- 2466-1791(eISSN)
Measurement of Heat Transfer Coefficient in a Duct with Double Imingement Jets
이중 충돌 제트를 갖는 내부 유로의 열전달 계수 측정
Abstract
Averaged heat transfer coefficients in the trailing edge model of a turbine blade with double impingements were measured using transient liquid crystals technique and conventional copper plate-thermocouple technique. The detailed distributions of heat transfer coefficients by transient liquid crystals technique were also presented. Results showed that increased heat transfer coefficient due to the inpingements and the averaged heat transfer coefficients increased as Reynolds number increased. Results by transient liquid crystals technique showed that the heat transfer coefficient strongly depended on the main stream temperature used in heat transfer coefficient calculation. The averaged heat transfer coefficients measured by different methods showed similar trend as Reynolds number changed, but the value varied up to 40% depending on the measurement technique.
Keywords