Menu Close

Case Study

Riblets in aeronautics The sky is the limit

Branche

Transport & Mobility

Customer

Aviation Industry

Service

Riblet Engineering

Task

Cost-benefit analysis of Riblets

Solution

Change of Riblet application area to reduce drag and improve lift.

benefit

Additional fuel and emissions savings

Project Details

1300 tons of carbon dioxide and 400 tons of jet fuel per long-range aircraft – that’s SWISS`s annual cut down on CO2 emissions and fuel and a promising start! However, taking advantage of Riblet films in aeronautics offers a huge potential as there is still air to the top. Within the last few years, the usage of Riblets on the fuselage has established itself as state-of-the-art. Carriers trust in Riblets to cut down costs for cargo flights. Swiss is the first passenger airline in the world to utilize the innovative Riblets technology on its long-haul flights to enhance the Boeing 777-300’s aerodynamics to further reduce the CO2 emissions and the fuel consumption. 
To summon up, this is the state of the art.

B777_300

Figure 1: B777-300

Case Study: Riblets in aeronautics – The sky is the limit

Abbildung 2: Simulation of ideal riblet sizes for a B777 model in top and side view

We at BST lean forward to the next venture beneath the skies and take a closer look on Riblet application costs and sustainability. Various factors affect the results: the application technology, area, material, and size of the aircraft as well as its impact on different aircrafts belonging to a certain airliner fleet. Our objective is to identify the most cost-effective and performance-efficient area of an aircraft to apply Riblets in terms of investment-benefit ratio. We aim to demonstrate that with a much smaller percentage of the total area of the airplane the same Riblet effect in terms of drag reduction could be generated, making Riblets even more attractive for the industry. The study w´was realized by designing a suitable Riblet geometry which was then used as a basis to run a numerical simulation. The analysis showed that applying Riblets on the main wing suction side rather than on the belly of the fuselage had the same impact.  Thus, limiting the Riblets on 5 percent of the total aircraft area instead of using Riblets on 20 percent of the area (located on the fuselage) improved aerodynamical efficiency in the same extend.

Outcome

We found out that applying the Riblets on a defined, small area of the wing has the same impact as coating the entire fuselage with Riblets when it comes to fuel savings. The study aimed at establishing a best practice on the use of Riblets in the airline industry that is as efficient as possible in terms of investment-benefit-ratio.

B777_DE

Figure 3: Different zone combinations to increase efficiency while minimizing areas of riblet application (E: lower fuselage section, F: upper fuselage section, A: main wing suction side with partial application, B: main wing suction side with application on total area)