On active control of film-cooling flows
Document Type
Conference Proceeding
Publication Date
11-15-2006
Abstract
A technical assessment of the potential improvements resulting from the application of active control of film cooling is discussed in this paper. Two methods of film-cooling jet excitation are theoretically evaluated. Film-cooling control through pulsation of the coolant stream mass flow rate is further examined on the basis of existing experimental and preliminary computational results. A potentially optimal range of coolant pulsation parameters are identified through theoretical and mechanistic arguments based on understanding of basic physical phenomena occurring in pulsed film-cooling flow, i.e. that of a pulsed jet in cross-flow. Guidelines for the choice of potentially optimum frequency and duty cycle windows of the controlling flow pulsations are identified, as well as the related mean and peak-to-peak blowing ratios. Evidence from existing experimental data and computations are invoked to validate these guidelines. Because of the limited experimental/ computational data on this subject further work is necessary in order to fully verify the aforementioned flowpulsing parameter ranges. Copyright © 2006 by ASME.
Publication Source (Journal or Book title)
Proceedings of the ASME Turbo Expo
First Page
61
Last Page
69
Recommended Citation
Nikitopoulos, D., Oertling, J., Acharya, S., & Muldoon, F. (2006). On active control of film-cooling flows. Proceedings of the ASME Turbo Expo, 3 PART A, 61-69. https://doi.org/10.1115/GT2006-90051
