Implementation of non-intrusive jet exhaust species distribution measurements within a test facility

Wright, P., McCormick, D., Kliment, J., Ozanyan, K., Tsekenis, S-A., Fisher, E., McCann, H., Archilla, V., Gonzalez-Nunez, A., Johnson, M., Black, J., Lengden, M., Wilson, D., Johnstone, W., Feng, Yutong and Nilsson, J. (2016) Implementation of non-intrusive jet exhaust species distribution measurements within a test facility. IEEE Aerospace Conference, Big Sky, Yellowstone, United States. 05 - 12 Mar 2016. (doi:10.1109/AERO.2016.7500731).

Abstract

We report on the installation and commissioning of two systems for the measurement of cross-sectional distributions of pollutant species in jet exhaust, within the engine ground test facility at INTA, Madrid. These systems use optical tomography techniques to estimate the cross-sectional distributions of CO₂ and soot immediately behind the engine. The systems are designed to accommodate the largest civil aviation engines currently in service, without obstruction of the exhaust or bypass flows and with negligible effect upon the entrained flow behavior. We describe the physical construction and installation status of each system. In the case of the CO₂ system, we examine the challenges of achieving the structural rigidity necessary for adequate suppression of pointing error within 126 laser-based transmittance measurements, each utilizing a 7 m overall path length. We describe methods developed for efficient implementation of co-planarity and 4-degree-of-freedom alignment of individual paths within this beam array. We also present laboratory performance data for three alternative optical designs that differ in their approach to the management of pointing error and turbulence-induced beam wander and spread. The FLITES soot monitoring capability is based on laser induced incandescence (LII) and uses a short-pulse fiber laser and two CCD cameras, in an autoprojection arrangement. We describe the measurement geometry currently being implemented in the test cell and discuss optical design issues, including once again the effect of the plume itself.

This record has no associated files available for download.

Contributors

Author: Yutong Feng

Author: J. Nilsson

Download statistics