Passive Combustion Control for Turbine Engine Noise Reduction

The objective of this research proposal is to investigate the effect of porous inserts on reducing the combustion generated noise from turbine combustor.This investigation of this passive combustion control concept will be conducted in a liquid and or gas fired cylindrical( six inch dia) combustor used in reducing gaseous emissions under contract number N00014-02-C-335.The proposed research will be conducted for atmoshpheric and high pressure operating conditions, using metallic and or ceramic porous inserts with different geometry and aspect ratios. During the investigation we will measure the temperature profile,pressures and noise levels for different air to fuel ratios and pore structure of inserts and their locations in the combustor.Based upon our test results,we will determine the model parameters for developing a numerical model to help screen the important design parameters that would be needed in designing specific geometry of the porous inserts units. Using both experimental and numerical data, we will develop a test matrix needed to conduct further investigation in Phase II . We have got the letter of interest from Hamilton Sunstrand ,a manufacturer of auxiliary power units used in commercial and military aircrafts.