This Proof of Concept (PoC) project introduces a new and innovative way to reduce aerodynamic drag on aircraft wings. In particular, it focuses on swept wings, which are the type most commonly used on today’s passenger jet airplanes. Swept wings are designed to perform efficiently at high, near-supersonic speeds, but they also face a major challenge: they create the so-called Crossflow Instabilities (CFI). These small disturbances in the airflow can grow and cause the smooth (laminar) airflow over the wing to turn turbulent. When this happens, the aircraft experiences more drag, meaning it needs more fuel to maintain speed. In fact, this transition from laminar to turbulent flow can account for nearly 40% of an aircraft’s total aerodynamic drag. Finding a way to keep the airflow smooth for longer could therefore have a transformative effect on fuel efficiency and sustainability in aviation.
The project is based on a breakthrough discovery made by the Principal Investigator (PI) and his research team. Their innovation, called the Delft Laminar Hump (or simply, “the Hump”), has shown great potential for delaying the onset of turbulence on swept wings. The Hump is a small, carefully shaped modification to the surface of the wing — a smooth, local protrusion that slightly alters the wing’s shape. While conventional aircraft wings are designed to be as smooth and uniform as possible, the Hump intentionally introduces a gentle change in geometry. This subtle shape adjustment influences how the air moves across the surface, reducing the strength of the Crossflow Instabilities that lead to turbulence. As a result, a larger portion of the wing can remain covered by laminar flow, which in turn reduces drag and improves overall aerodynamic efficiency. The concept is simple in appearance but scientifically sophisticated in effect, combining several aerodynamic mechanisms such as boundary layer modification and instability control.
Several technological challenges must still be addressed before the Hump can be fully applied in real-world aircraft. The purpose of this PoC project is to bridge that gap — The project has pursued several key objectives:
- Demonstration and testing: Validate the performance of the Hump in near-flight conditions and demonstrate that it can enable passive laminarization — maintaining smooth airflow without the need for active control systems.
- Environmental resilience: Study how real-world factors, such as debris, insect impacts, or surface contamination, may affect the performance of the Hump and find ways to mitigate these effects.
- Intellectual property and patenting: Strengthen the protection of the Hump’s intellectual property and extend it into an International patent application, ensuring the innovation is safeguarded for future development.
- Business development: Explore pathways for technology transfer, industrial partnerships, and licensing, to bring the Hump concept closer to market adoption.
- Roadmap for future development: Create a "Technology Development Roadmap" outlining the steps required to advance from proof-of-concept to a scalable technology suitable for integration in future aircraft designs.
Through these activities, the project aims to demonstrate that the Delft Laminar Hump could become a key enabler of greener, more energy-efficient aviation. By reducing aerodynamic drag and fuel consumption, this innovation supports Europe’s broader goals for sustainable air transport and climate-friendly technology development.
