Velocity and Heat Transfer Studies of an Impinging Jet using MRV and IR Thermometry

Summary: Jet impingement cooling within turbine vanes channels and focuses air upon the interior surface of the vane to improve mechanical efficiency and increased energy output which could otherwise overheat the system. This study investigates the behavior and characteristics of the flow impinging upon a surface through a heat transfer experiment leveraging infrared (IR) thermometry and previously conducted experiments focusing on the velocity of the flow through Magnetic Resonance Velocimetry (MRV). The heat transfer experiment utilized comparable aspects of the MRV experiment, to include the Reynolds number of the flow and the distance of the jet from the surface, to develop radial Nusselt number distributions around a single, circular impinging jet. There exists an inverse relationship within a radius of two diameters from the stagnation point in which there may exist a shear layer mixing at lower velocities, contributing to higher heat transfer coefficients. There are many future recommendations for this study to include: CFD analysis to further validate our data, a confined environment for the heat transfer experiment to more closely mirror the MRV experiment, and improvements upon the connection between the bus bars and the shim to limit the voltage drop prior to the shim.

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