SIPS 2018

DETAILLED PROGRAM OVERVIEW

New Designs of Rotors with Variable Geometry Parameters in Dynamics and Their Effective Use in Aviation and Wind Energy
Raul S. Turmanidze¹; Paata Kervalishvili¹; Giorgi Popxadze¹;
¹GEORGIAN TECHNICAL UNIVERSITY, Tbilisi, Georgia;
PAPER: 162/Manufacturing/Regular (Oral)
SCHEDULED: 14:00/Wed./Sao Conrado (50/2nd)

ABSTRACT:
Famous specialists of many leading scientific centers of the world unambiguously prove that, from the date of existence of airscrews, the problem of creating a design for screws with the possibility to change key geometrical parameters in dynamics is particularly acute. It stems from the fact that existing screws are not optimal for all operational phases of units with different functions. The solution to this problem is possible only by using screws of changeable geometry (SCG), which has the capability to simultaneously change the diameter of the screw and a corner of installation, and twist the blades in dynamics. As a result of production and tests for various designs of the screw's demonstration model with changeable geometrical parameters in dynamics, it was proven that, for example, for aircraft use the WHIG gives the chance of especially effective optimization of aircraft flight in vertical takeoff and landing (SVVP), ensuring the maximum diameter and the minimum twist in the hanging mode and vice versa, the minimum diameter and the maximum twist at horizontal flight. In particular, at a variation of diameter of trial model of a rotor, for example, from - 4,1 to - 5,6 m and twists of blades within 80-300 it is possible to increase aircraft loading capacity on average 1.6 times, or to increase flight speed 1.4 times, or respectively to reduce fuel consumption. For wind power installations, especially with big capacities, use of the WHIG will give the chance to expand the range of the maximum efficiency values of installation at changes of wind speed in a wide range from 3 to 20-22 m/s, and also provide installation operability at high wind speeds of 22-35 m/s), at which the existing installations would not be in a functional state. The solution of this problem became particularly salient because of the infamous accident in Fukushima, Japan. These events compelled leaders from major countries of the world to find as many opportunities as possible to replace a share of atomic energy with other types in the overall power balance. Unfortunately, methods that are more effective than wind power in terms of economic and ecological criteria, and potentially mastered volume of energy, do not exist. Preliminary aerodynamic and economic calculations carried out, by means of the design developed by us, proved that it is possible to increase the annual volume of each wind turbine's energy by a minimum of 100%. In the presented work, different options for the rotor designs developed by us, with the indication of their advantages to each case will be analyzed. Further, on the basis of the results from aerodynamic tests of working models that were carried out, recommendations for effective use of each option in these or those concrete branches of equipment, are given. Additionally, the method of accumulation for the received wind and solar energy, which is very effective at prime cost, is an pressing world problem for which there is development costing some hundreds of millions of US dollars annually, will be offered and analyzed. The proposal refers to those countries that have hydroelectric power plants with medium and large capacities— for instance where there are already high dams and reservoirs built . The core of our proposal is that it is possible to mount the greatest possible number of wind stations and solar panels around a reservoir. When there is an order for electric energy they will work for its production, and when orders are not present, they will work for water pumping back from the lower reservoir in its top part. It will give the opportunity to have all power sources working constantly for profit, day and night, day after day, and all the year round. A very effective method of location and operation of solar modules will also be elaborated and presented. The proposed method of accumulation of wind and solar energy gives an opportunity for effective operation of wind and solar stations, the repeated use of accumulated water and, most importantly, fundamentally changing the principle of projecting and constructing of hydroelectric power stations of medium and large capacities. In addition it is necessary to underline the increase of the safety of hydroelectric stations, the reduction in the flooding of the country's cultural values and decrease area of the mirror surface of the reservoir, which adversely affects the changing climatic conditions of this region.

References:
[1] R.Turmanidze, L.Dadone. "Variable Geometry Rotor". Monograph, Publishing House of University of Petrosani. 2003, Romania, 164 p.
[2] R.Turmanidze, L.Dadone, G.Sanadze. Increase of Flight and Technical Characteristics of Flying Vehicles By Means of Application of the Variable Geometry Rotor. Materials of the 5th Forum of the Russian Helicopter Society. Moscow, 2002. p. VI39-VI48. AGARD. 1998. A selection of test cases for the validation of large eddy simulations of turbulent flows. Agard Advisory Report 345. North Atlantic Treaty Organization.
[3] R.Turmanidze, L.Dadone, J.-J.Philippe, B.Demaret, Investigation, Development and Tests Results of the Variable Geometry Rotor. 33 rd. European Rotorcraft Forum. Kazan, 10-14 September 2007, Pages 11.
[4] R.Turmanidze, О.Rukhadze, R.Bidzinashvili, Е.Rukhadze, Designing Fundamentals of Investigation Equipment of Rotors with the Parameters of Variable Geometry. International Scientific Journal "Problems of Mechanics". 1 (42)/2011. Georgia, Tbilisi. 2011. 8 p.
[5] R.Turmanidze, О.Rukhadze, R.Bidzinashvili, Е.Rukhadze, Investigation of the Variable Geometry Rotor in Dynamics. International Scientific Journal "Problems of Mechanics". 2(43)/2011. Georgia, Tbilisi, 2011. 8 p.