This work investigates passive jet-noise mitigation using externally positioned air–water curtains that attenuate radiated sound without altering the underlying jet dynamics. Two classes of multiphase media are examined: a gaseous carrier phase containing dispersed liquid droplets, and a liquid carrier phase containing entrained air bubbles. For both systems, suspended and dispersed regimes are represented through a generalized perturbation formulation derived from the volume-averaged multiphase equations, incorporating finite volume fractions, interphase momentum coupling, and slip between phases. Analytical and numerical solutions demonstrate that acoustic attenuation is primarily governed by dispersed-phase diameter, volume fraction, and excitation frequency, with additional sensitivity to phase-interaction mechanisms. Comparison with available experimental measurements and CFD results confirms the accuracy of the predicted absorption trends. The findings establish that multiphase curtains can provide an effective passive pathway for broadband jet-noise reduction and offer a physics-based foundation for optimizing curtain composition, geometry, and operating conditions in future aeroacoustic applications.
","abstract_html":"<p>This work investigates passive jet-noise mitigation using externally positioned air–water curtains that attenuate radiated sound without altering the underlying jet dynamics. Two classes of multiphase media are examined: a gaseous carrier phase containing dispersed liquid droplets, and a liquid carrier phase containing entrained air bubbles. For both systems, suspended and dispersed regimes are represented through a generalized perturbation formulation derived from the volume-averaged multiphase equations, incorporating finite volume fractions, interphase momentum coupling, and slip between phases. Analytical and numerical solutions demonstrate that acoustic attenuation is primarily governed by dispersed-phase diameter, volume fraction, and excitation frequency, with additional sensitivity to phase-interaction mechanisms. Comparison with available experimental measurements and CFD results confirms the accuracy of the predicted absorption trends. The findings establish that multiphase curtains can provide an effective passive pathway for broadband jet-noise reduction and offer a physics-based foundation for optimizing curtain composition, geometry, and operating conditions in future aeroacoustic applications.</p>","abstract_has_math":false,"creators":["Uribe Cifuentes, Juan Felipe"],"institution":null,"degree_name":"Master of Science in Aerospace Engineering","degree_level":"Thesis - Open Access","degree_discipline":"Aerospace Engineering","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2025,"date_issued":"2025-10-01T07:00:00Z","date_published":"2025-10-01T07:00:00Z","updated_at":"2026-07-27T19:26:22Z","subjects":["Multiphase Flow; Suspended Acoustics; Jet Noise; Noise Reduction; Particulate Attenuation; Bubbly Attenuation","Aerodynamics and Fluid Mechanics"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://commons.erau.edu/edt/938","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Uribe Cifuentes, Juan Felipe"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"thesis:degree_discipline","label":"Discipline","values":["Aerospace Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis - Open Access"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science in Aerospace Engineering"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Multiphase Flow; Suspended Acoustics; Jet Noise; Noise Reduction; Particulate Attenuation; Bubbly Attenuation","Aerodynamics and Fluid Mechanics"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://commons.erau.edu/edt/938"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["This work investigates passive jet-noise mitigation using externally positioned air–water curtains that attenuate radiated sound without altering the underlying jet dynamics. Two classes of multiphase media are examined: a gaseous carrier phase containing dispersed liquid droplets, and a liquid carrier phase containing entrained air bubbles. For both systems, suspended and dispersed regimes are represented through a generalized perturbation formulation derived from the volume-averaged multiphase equations, incorporating finite volume fractions, interphase momentum coupling, and slip between phases. Analytical and numerical solutions demonstrate that acoustic attenuation is primarily governed by dispersed-phase diameter, volume fraction, and excitation frequency, with additional sensitivity to phase-interaction mechanisms. Comparison with available experimental measurements and CFD results confirms the accuracy of the predicted absorption trends. The findings establish that multiphase curtains can provide an effective passive pathway for broadband jet-noise reduction and offer a physics-based foundation for optimizing curtain composition, geometry, and operating conditions in future aeroacoustic applications.
"]},{"key":"dc:title","label":"Title","values":["Perturbation Solution of Air-Water Mixture for Jet Noise Reduction"]}]}],"canonical_facts":{"dc:creator":["Uribe Cifuentes, Juan Felipe"],"dc:description.abstract":["This work investigates passive jet-noise mitigation using externally positioned air–water curtains that attenuate radiated sound without altering the underlying jet dynamics. Two classes of multiphase media are examined: a gaseous carrier phase containing dispersed liquid droplets, and a liquid carrier phase containing entrained air bubbles. For both systems, suspended and dispersed regimes are represented through a generalized perturbation formulation derived from the volume-averaged multiphase equations, incorporating finite volume fractions, interphase momentum coupling, and slip between phases. Analytical and numerical solutions demonstrate that acoustic attenuation is primarily governed by dispersed-phase diameter, volume fraction, and excitation frequency, with additional sensitivity to phase-interaction mechanisms. Comparison with available experimental measurements and CFD results confirms the accuracy of the predicted absorption trends. The findings establish that multiphase curtains can provide an effective passive pathway for broadband jet-noise reduction and offer a physics-based foundation for optimizing curtain composition, geometry, and operating conditions in future aeroacoustic applications.
"],"dc:identifier":["https://commons.erau.edu/edt/938"],"dc:subject":["Multiphase Flow; Suspended Acoustics; Jet Noise; Noise Reduction; Particulate Attenuation; Bubbly Attenuation","Aerodynamics and Fluid Mechanics"],"dc:title":["Perturbation Solution of Air-Water Mixture for Jet Noise Reduction"],"thesis:degree_discipline":["Aerospace Engineering"],"thesis:degree_level":["Thesis - Open Access"],"thesis:degree_name":["Master of Science in Aerospace Engineering"]},"updated_at":"2026-07-27T19:26:22Z"}