ROTOJET Technology - The New Jet Turbines of 21^st Century

One of the fastest emerging fields of clean, renewable energy also involves the water, but with fewer of the concerns. Hydrokinetic energy works by harvesting energy from the natural, recurrent movement of water, without significantly altering the water flow or landscape. As recognizable as wind-turbine lookalikes in the water, or as odd looking as jointed bouys on the water’s surface, hydrokinetic power generators come in many forms. We have developed (  www.tonchev.org  ) several highly efficient JET designs, described on these pages. Hydrokinetic power could be a major new step both toward a cleaner energy system, and a more energy independents of conventional fuels.

Technical history of the development of wind-turbine building has begun at the end of 19^th and the beginning of 20^th century. The scientific, technical and technological development of the propeller wind turbines follows the development of the airplane propellers. The principal difference between the fluid propeller motors and the fluid propeller turbines is in their function. The propeller motors have the task to create traction. Their rotation is what creates their traction and it is not an aim but a mean. And as far as there are losses of energy during the rotation then they are parasitic according to the main function – the traction. In each case the losses from rotation are unavoidable.

The mission of propeller turbines in the mass case is to rotate for turning the electro-generator. It means that the rotation is the aim and not the mean as it is at the propeller engines. During their rotation the turbines are subjected to the dynamic thrust of the flow which is unfavorable from energetic point of view. This axial thrust is in a sense analogical to the traction at the propeller motors. But for the turbines it is parasitic from energetic point of view and from mechanical-constructive standpoint it destroys them and is also undesired.

The working Principe of the JET fluid turbines is radically new. The JET propeller turbines rotate by analogical reason causing the rotation of the non-JET propeller turbines. The propellers of JET turbines rotate by reason of the difference of the flow pressure before and after their blades. But this difference around the outlines and especially at the periphery of their blades is almost zero, because the fluid with high pressure freely passes to the back blade side, where the pressure is lower which ultimately leads to losses of energy (tip blade loses). This is the first main disadvantage of the propeller turbines.

The second one is that the axial thrust of the fluid over turbine rotors is parasitic and does not contribute to their rotation but only loads them mechanically.

The ROTOJET designs solve the main two problems of the conventional propeller (lift and/or drag) turbine rotors by JET peripheral channels (or semi channel) of the blades. The JET channels have two functions:

• The fist one is to avoid the tip blade energy loses because of tip vortices,

• The second function is much more significant. The second function is acceleration of the fluid current in the JET channel (or semi channel) and its directing towards the back of the correspondent blade, and thus the flowing current to create JET stream. In the opposite direction of the JET flow appears JET force/torque which considerably supports the rotation.

Because of the JETchannels big part of the fluid pressure over the rotor is redirected into JET force and also due to the channels the inductive blade tip losses of energy are vastly decreased.

Owing to the mentioned above, the JET rotors (propeller or non-propeller) are about two and more times more efficient in comparison to the conventional rotors.  Such JET turbines are described in the  patent descriptions BG110 251/2008 and BG 110 340/2009

Based on new invented ROTOJET fluid kinetic energy converters are developing number of wind and hydrokinetic JET rotor designs. Each of them is full scalable. JET rotor/blades concept require new line of airfoil / hydrofoil  cross section, new plan form, new pitch and twist designs, new hub etc. In addition we have developed complete new ROTOJET power system "flow - blade - rotor - drive train - electric generator - power controller/inverter" . ROTOJET power system design is easy tailored to the specific flow conditions (velocity, turbulence etc.) to achieve much better system capacity factor. Thanks to the additional JET mode of blade rotations new designed turbines can increase the turbine efficiency many times (see videos at www.b2b.bg/new.html )

See a comparison in operation of JET turbine vs. conventional turbine at: http://www.youtube.com/watch?v=ghp-7MqUyhs

For some applications of ROTOJET power system is possible JET rotor upgrade / retrofit of the conventional rotors.

Several patented and patent pending  solutions of new invented JET rotors  you can see at www.tonchev.org/jetbladevideo.html 

By new invented JET wind turbines is quite possible to double turbine power output of both axial and cross flow turbines (with same rotor diameters) at low wind velocity. Also is possible to reduce turbine spacing in Wind Farms and to guarantee the same overall energy yield as by non JET wind machines. See a comparison in operation of JET turbine vs. conventional turbine at: http://www.youtube.com/watch?v=ghp-7MqUyhs  

New invented end less JET blades of a wind / hydro kinetic turbine propeller

New invented (patent pending) end less JET blades of wind / hydro kinetic propeller. Blade tips of propellers create significantly energy loses and noise / cavitation. Newly invented JET blades avoid tip energy loses and and noise / cavitation. That is why new endless blades are much more efficient in the comparison with all known blades. Patent pending - see more at http://www.tonchev.org