Turboshaft Engine Exhaust Noise Identification
TEENI deals with experimental identification of the contributions of each of the engine modules to exhaust Broadband Noise emission. This noise component is the second most dominant noise source of a Turboshaft engine, and installing acoustic liners on the exhaust can lead to significant benefit for reducing noise levels from helicopters.
Turboshaft exhaust noise is taken to be a mix of combustion and turbine noise, with very little jet noise. It is representative of what is generally called core noise on aircraft engines. Therefore, it should also help with the understanding of this difficult subject, as a result of its simpler geometry and absence of parasitic noise sources (such as jet and fan noise).
- WP1 : Innovative sensors development - to provide reference measurements of fluctuating quantities within the engine under harsh operating conditions.
- WP2 : Noise Sources Breakdown Techniques (NSBT) development - to determine the dominant emission location/s from external measurements. Several techniques will be evaluated, both internal and external measurements will be undertaken, and, various formalisms and approaches will be considered. Propagation through turbine/s and tools to help take into account individual engine noise sources will also be developed.