Tailored Surface Vibrations Promise Improved Jet Fuel Efficiency
New research introduces engineered microscopic vibrations from subsurface materials to control airflow turbulence and enhance fuel economy in aircraft.
Researchers at the University of Colorado Boulder are developing a novel approach to improve aerodynamic performance and fuel efficiency in passenger jets by manipulating microscopic vibrations within specialized subsurface materials. This innovation aims to counter the effects of wind and boundary-layer turbulence that challenge aircraft operation and efficiency, potentially leading to significant savings for airlines given the substantial fuel consumption of commercial flights.
The core of this research lies in the field of phononics, which focuses on controlling phonons – tiny vibrations within a material itself. Professor Mahmoud I. Hussein and his team have introduced the concept of phononic subsurfaces (PSubs), materials designed to passively influence vibrations on surfaces interacting with fluid flow. While previous PSubs were engineered for single-frequency operation, the latest advancements enable control across a range of frequencies, a phenomenon termed super-resonance.
This super-resonance capability overcomes a key limitation by allowing control over turbulence generated across multiple frequencies, mirroring real-world conditions. Furthermore, the concept of scatterless interference allows for the arrangement of multiple PSubs in a grid or lattice. This configuration enables the delay of turbulence across larger surface areas, such as aircraft wings or the bodies of hypersonic vehicles, providing effective downstream control.
These dual discoveries, super-resonance and scatterless interference, address the primary limitations that have historically hindered the practical application of PSubs for flow control. While the current research is primarily computational, functional physical prototypes of PSubs have been developed by various research groups, with ongoing efforts toward wind tunnel demonstrations. The ultimate goal is to enable airflow interaction through engineered subsurface materials, allowing external surfaces to remain smooth.
This development in phononics offers a paradigm shift in aerodynamic drag reduction, moving beyond traditional shape optimization and active actuators. By engineering subsurface materials to induce controlled vibrations, PSubs can passively manage airflow turbulence across broad frequency ranges and large surface areas. This has significant implications for improving fuel efficiency in aerospace, potentially extending to applications in marine vessels and turbomachinery where turbulence is a performance bottleneck.
Edited by the news editor with AI from the original report — please refer to the original source.