Session: 15-05: Double-Wall Internal Cooling

Submission Number: 178166

Detailed Internal Cooling Heat Transfer Measurements on Gas Turbine Blade Models Featuring Double Walled Cooling Concepts 

Jet impingement is one of the most powerful cooling techniques for gas turbine blade internal cooling passages, and as such is typically used to cool the leading edge of the blades in modern cooling designs. In more advanced cooling designs, the jet impingement features have been extended to coat the entire blade rather than just the leading edge in cooling concepts like the double walled cooling design. This design concept is taken another step further by combining the impingement features with pin-fin like structures placed in the impingement regions in Lamilloy© based designs. However, the inherent geometrical complexity of these advanced cooling concepts makes manufacturing experimental models for detailed heat transfer measurements very difficult. Recent advances in additive manufacturing technology allow for the creation of more complex test models of gas turbine blade internal cooling passages, enabling the experimental study of these advanced cooling design concepts that were not previously possible. This work reports detailed heat transfer measurements using a transient liquid crystal technique on gas turbine blade models featuring double walled cooling concepts. The models are additively manufactured from clear resin and polished to provide optical clarity for the liquid crystal technique. Results are reported across a range of coolant Reynolds numbers without rotational effects.

Presenting Author: Wesley Fisher North Carolina State University

Presenting Author Biography: PhD student at North Carolina State University studying the internal cooling heat transfer characteristics of more realistic gas turbine blade models with a focus on experimental results.

Authors:

Wesley Fisher North Carolina State University
Vaden Young North Carolina State University
Srinath Ekkad North Carolina State University