Abstract
Currently, the acoustic analysis of combustion systems generally consists of simplified impedance networks. For effective simulation, the impedance of these components must be known, for which there is a large gap in the current knowledge. This study examines the acoustic impedance for various different types of gas-turbine engine components, including acoustically nonlinear components such as swirlers and orifice plates. Experimental results are obtained using a specially designed impedance tube. Acoustic pressure and velocity measurements are made using a multiple microphone method. The impedance is then calculated using the reflection coefficient, and impedance subtraction used to isolate the test article. This method obtains accurate results within a relatively wide range of frequency values, 100–1500 Hz for this study. Amplitude sweeps conducted for each test article demonstrate the nonlinear aspects, if any, for each test article. These results are then compared to acoustic simulations conducted in COMSOL to assess the capabilities and shortcoming of COMSOL’s linear acoustic package to provide predictions of the acoustic impedance of these components. The results for this are intended to provide valuable data for modeling the acoustics of combustion systems, as well as demonstrate an effective method for obtaining impedance data for various acoustic components.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
