Collaborative Research on Combustion Diagnostics and Modeling between Rolls-Royce Inc. and the United States Air Force Wright Laboratory
Abstract
Diagnostic techniques are employed to investigate flows typical of a gas turbine combustor with the aim of furthering the understanding of the complex physical and chemical processes involved and using this understanding in validating and developing combustion Computational Fluid Dynamic (CFD) codes. Detailed measurements of velocities and Reynolds stresses have been made with a Laser Doppler Velocimeter (LDV) in an axisymmetric combustor with a strongly swirling, isothermal, turbulent flow. Anomalies identified in the initial measurements were attributed to LDV signal noise problems caused by reflections off the internal combustor walls. Future LDV measurements will be taken along a vertical diameter within the combustor to minimize these noise problems. Comparisons of the isothermal measurements with CFD predictions are presented and discussed. Both a Reynolds Stress Transport Model (RSTM) and a k epsilon turbulence model have been employed. The RSTM out performs the k - epsilon model for this strongly swirling flow. Although the v' w' shear stress could not be measured with the current combustor configuration, the results from the modeling illustrate the important role played by the v' w' shear stress in defining the nature of the swirling flow. A new Rolls-Royce designed and manufactured water- cooled combustor, with enhanced optical access will permit the simultaneous measurement of all velocity components and all Reynolds stresses. Details of this new test section are presented.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1993
- Accession Number
- ADA270660
Entities
People
- A. Rose