Heat transfer augmentation in a rectangular duct characterized by an impinging jet inlet : design of experiment


Energy is one of the most important engineering challenges of this time. Gas turbine engines a,re responsible for nearly twenty-percent of all electricity produced in the United States today. A small increase in the operating efficiency of these engines could lead to massive reduction in the emission of greenhouse gases into the atmosphere as well as the financial burden on the average homeowner paying the monthly energy bill. In order to improve the efficiency of the engine, the Turbine Inlet Temperature of the hot gas coming from the combustor is continually increased. This requires increasingly advanced active cooling methods to maintain component life in the hot stages of the turbo machine.

In this study, a complete experiment is developed for accurate testing of the complex heat transfer and aerodynamic characteristics present in the active cooling design applied to the transition duct of a land-based gas turbine. The transition duct is the component that channels the hot gases from the combustor to the first stage of the turbihe. It is in contact with the hottest mainstream gas flow in the entire machine. The unique cooling design applied to this component is a combination the three main cooling methods. It is characterized by an impinging jet inlet, which splits into two identical channels flowing in exactly opposite directions. The flow travels through these channels, cooling the hot surfaces of the duct through which they are formed. At the flow exit, it is expelled into the hot gas stream flowing from the can-annular combustor to the turbine stage. The channel exit provides a thin film of cool air coverage that protects the metal surface from the harsh temperatures of the hot gas.


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Thesis Completion



Kapat, Jayanta


Bachelor of Science (B.S.)


College of Engineering and Computer Science

Degree Program

Mechanical Engineering


Dissertations, Academic -- Engineering and Computer Science;Engineering and Computer Science -- Dissertations, Academic







Access Status

Open Access

Length of Campus-only Access


Document Type

Honors in the Major Thesis

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