WTS 3D Serrations

Reduce noise and increase yield (win-win situation)

WTS has developed a new 3D geometry for TES, which enables a significantly higher noise reduction of up to 3 dB(A) in comparison to the previously used 2D designs, compared to the manufacturer's serrations.

This means that the wind turbine is up to 6 dB(A) quieter than a wind turbine without serrations. This is particularly true in the most sensitive range for the human ear, 1000 - 3000 Hz.
This opens up new potentials for increasing yields through improved night operation, extended site utilization and repowering.

WTS - Wind-Tuning-Systems GmbH is specialized in the development and distribution of aerodynamic add-ons for wind turbines.
In cooperation with a worldwide operating serration producer of the wind industry, we can offer our products in "Made in Germany" quality in large quantities at an attractive price.
The patented method of fastening, which is carried out simultaneously on the top and bottom of the rotor blade with a V-shaped base element, enables a very durable fastening.
With experienced wind energy service providers for the attachment to the rotor blades of your turbine, we thus receive the guarantee for a WTS-Serrations with a very long service life.

With the innovative WTS 3D serration design, WTS achieves a noise reduction of up to 6 dB(A) and is thus up to twice as high as the serrations currently available on the market with a noise reduction of 2 - 2.7 dB(A).

This means that WTS is actively tackling the most pressing problem currently facing the expansion and operation of onshore wind turbines. Not least because of the recalculation/remeasurement of noise emissions from wind turbines in Schleswig-Holstein.

Increase in yield

The additional noise reduction has a direct effect on existing systems as an yield increase, as no night shutdowns or reduced night mode operation are possible (3 - 6 % yield increase). At noise-sensitive locations, the wind turbines can be operated at the optimum operating point without disturbing the noise immission limits.

The additional noise reduction of up to 3 dB(A) opens up new possibilities for the repowering of wind sites. This makes it possible to use up to 100% more wind turbines at the same location.

On new turbines, the WTS-Serrations technology enables the use of longer rotor blades due to the additional noise reduction.

Due to the high yield increase due to noise reduction, the payback period for the retrofit investment is 1 - 2 years.


Current status

The WTS-3D serration technology has already been confirmed using complex simulations and in the wind tunnel. With the professional validation simulations for noise emission, the validation was carried out with the support of the external partner Dassault Systems.

At pilot plants of a wind farm in Schleswig-Holstein and the accompanying certification we will shortly receive the certification of these WTS-3D-Serrations.

Partner wanted

WTS is still looking for further operators or operators who want to use WTS products as a first benefit and want to make individual plants available as pilot plants with a win-win situation. Ideally, these are citizen wind farms that have to operate, for example, at night shutdown or reduced night operation.

Simply register or send us your wind farm data by clicking on the link below and you can enter the data in our request form.

Thank you very much for your interest in our products, we will be happy to make you a concrete offer for your wind farm so that you can be one of the first to benefit from these advantages:

(Are you interested in providing one or more pilot plants ?
Then mark this in the inquiry form )

Die WTS-Produktfamilie

WTS-Serrations mit 3D-Design

Simulation zeigt ein Testprofil ohne Serrations mit dem wichtigsten Abstrahlungs-Bereich der Schallemissionen

Simulation zeigt ebenfalls den Bereich der Schallabstrahlung auf der Profil-Unterseite ( rote Farbe am höchsten)

Back-flow-flap retrofit

Back-flow-flaps are based on the bionic principle of how the covering feathers of birds’ wings flip upward during their landing approach. The breakdown of large vortices into smaller vortices leads to less resistance and more lift on the rotor blade. Particularly in the case of stall-controlled turbines, it is possible to boost energy by up to 1.5%, while at the same time reducing static and dynamic loads.

Back-flow-flaps can be attached to existing wind energy converters as a retrofit system. Due to the relatively large bonding surface of the base element and the material design, they remain affixed to the turbine for its entire service life. The passive flap elements move up and down on their own due to the aerodynamic forces exerted on the rotor blade. The material and design used allow the back-flow-flaps to function even when the rotor blade is bent.

Back-flow-flaps for new turbines

The yield of wind energy converters depends primarily on the area swept by the rotor blade. For the materials currently used in the design of rotor blades, the physical load limits have been reached with today’s turbine sizes. In the future, load-reducing measures such as the use of back-flow-flaps could enable the production of larger rotor blade diameters using current state-of-the-art materials. With smaller rotor blade diameters as well, e.g. with existing turbines, the load-reducing measures can optimise operating costs and service life. In the future, back-flow-flaps may also prove useful in reducing peak loads and vibration inductions on wind energy converters, such as in the event of cross-flow, in order to avoid unscheduled maintenance or to allow the wind energy converters to continue to be operated safely beyond the previously planned service life.