TED-AJ03-641 Thermal Dispersion of Discrete Jets upon Entrance to a Stirling Engine Regenerator under Oscillatory Flow Conditions

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概要

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• A physical model of a stacked-screen Stirling engine regenerator with a porosity of 90% was constructed to be representative of modern free-piston engines. In this model, discrete jets impinge on a regenerator matrix, which simulates the fluid mechanics and thermal characteristics of the flow coming either from cooler or heater tubes and entering the regenerator matrix in a real engine. Present focus is on the thermal dispersion of discrete jets within the regenerator matrix. Velocity measurements within the plenum between the regenerator and the cooler were taken as part of the qualification experiments. Fine-wire thermocouples were then employed to take unsteady temperature measurements, resolved in space and time, within the plenum and the regenerator matrix. Such measurements show thermal dispersion of the jets within the regenerator matrix and indicate the fraction of the matrix material that is participating fully in thermal exchange with the fluid. By comparing the jet growth within the regenerator to the growth of a free turbulent circular jet, the eddy viscosity of the jet is estimated. All cases are run under conditions characterized by a Valensi number of 14.3 and a maximum Reynolds number of 20700 (the length scale is the cooler tube diameter and the velocity scale is the cycle maximum bulk mean velocity in the cooler tubes).

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著者

• Simon Terrence

  Heat Transfer Laboratory Department Of Mechanical Engineering University Of Minnesota

• Niu Yi

  Heat Transfer Laboratory Department Of Mechanical Engineering University Of Minnesota

• Ibrahim Mounir

  Mechanical Engineering Department Cleveland State University

• Gedeon David

  Gedeon Associates

関連論文

• TED-AJ03-641 Thermal Dispersion of Discrete Jets upon Entrance to a Stirling Engine Regenerator under Oscillatory Flow Conditions

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