Film Cooling by a Pulsating Wall Jet.
Abstract
This report summarizes the results of an experimental, numerical, and theoretical project that was initiated in 1994 with funding under AFOSR Contract Number F49620-94-1-0131. The objective of the work was to perform a fundamental exploration of the heat transfer and fluid mechanics in a wall jet with emphasis on applying passive techniques to control or manipulate the rates of heat transfer. After constructing the apparatus, developing the instrumentation, and developing the computer codes for the numerical simulation and the models for the theoretical investigations, we proceeded to study the effects of heating and cooling on the steady laminar wall jet. We examined the evolution of small-amplitude perturbations which were externally introduced into the flow. The amplitudes of the disturbances were significantly increased in the second stage of the investigation and their effect on the flow and temperature field was analyzed. The primary finding suggests that Reynolds analogy is not as universally applicable as we were lead to believe primarily when the mean velocity profile and the mean temperature profile are different or when the flow is periodic.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 18, 1997
- Accession Number
- ADA329651
Entities
People
- Alfonso Ortega
- Hermann Fasel
- Israel J. Wygnanski
Organizations
- University of Arizona