No small amount of money was spent in developing Vortexis, the final tally exceeding $2 million in R & D towards developing this evolutionary new design and patent. Remarkably, Vortexis is the first patent of significance for a Vertical Axis Wind Turbine since 1931 when the Darrieus VAWT received its patent. And Vortexis is a giant leap forward. The key differentiation for Vortexis is the Patented Vortexis "Pre-Swirl" Augmented Vertical Axis Wind Turbine (PA-VAWT). This novel airfoil was designed and developed by engineers at Wind Power Systems, the precursor to Vortexis Energy Solutions, with consideration of comparable technologies used in space exploration. It's no coincidence that the company's R&D facilities are at Cape Canaveral. The result is an ultra-efficient, robust, earth-friendly, micro and "nano" wind turbine with a unique blade Force Multiplier technology. The ground-breaking PA-VAWT technology generates significantly more power in less wind when compared with conventional VAWTs.
The novel pre-swirled augmented vertical axis wind turbine (PA-VAWT) was designed with the concept of developing a high efficiency VAWT that keeps the advantages of VAWT’s compact size, lack of bias as to incoming wind direction, easy deployment and low radar cross section. The result is the Vortexis Turbine, with a superior power coefficient of 35%, which places it at the top of all VAWT’s currently on the market. In other words, 88% of what's theoretically possible, and making the PA-VAWT Vortexis sustained power output 20-40% greater than any and all VAWT competitors on the market - "period."
The PA-VAWT is composed of a concentric stator and rotor. The rotor is located in the inner region of the turbine and is driven to spin by the flow from the stator around the center of the turbine.There are two end plates on the top and bottom of the turbine to reduce energy loss due to tip vortices.The stator surrounds the rotor in the outer region of the turbine, turns and accelerates the free-stream flow before it strike the rotor. The rotated rotor is connected to the end plate at the bottom, which drives a shaft and a generator to output electric power. There is no shaft in the center of the rotor to reduce energy loss due to jet interaction with the shaft.
The design principle of the PA-VAWT is to produce high power output by generating high turning of
the flow, which is the same design principle as aircraft engine axial turbine based on Euler turbine equation.
The primary performance advantages of the PA-VAWT include:
1) The pre-swirl turns the flow to the rotor rotating direction and makes the relative flow incidence to rotor more uniform. As the result, it increases the area within a rotation cycle that a rotor blade can generate power output.
2) The pre-swirl of the stator will increase the rotor turning with the rotor blade chord more aligned with radial direction (small absolute value of stagger angle), which will reduce the blade metal blockage.
3) The pre-swirl process reduces the guide vanes area and accelerates the flow before striking the rotor. Even though
the stator blade will reduce the rotor capture area for free-stream, the benefit of velocity increase due to pre-swirl will surpass the area reduction since the power output is proportional to velocity cube and lineally proportional to capture area.
4) The high aerodynamic efficiency allows the turbine to have compact size with high power output, light weight, and
5) The stator blades work as a shield to reduce radar cross section of the turbine because the radar signature is mostly
generated by the rotating blades.