Pavan Sansaadhan Mulyankan - Pavan urja upabhog ki oor pehla kadam (Wind Resource Assessment - A first step towards harnessing Wind energy)

This paper was presented at the National Hindi Conference on Science and Technology, NAL, Bangalore. The paper describes the essence of wind resource assessment and its importance in harnessing wind energy.A generalized methodology of carrying out the wind resource assessment is described. To give a practical touch to the paper, a wind resource assessment done at a smaller scale at Kodihalli Campus is elaborated. The findings are discussed and the essence so as to how these outcomes would be used for further wind turbine design are explained

Sessoion 2 : Wind Turbine Overview, Design and Testing Aspect (Power point Presentation)

A two day's AICTE sponsored Staff Development Programme on Wind Energy was organized at Sardar Vallabhbhai National Institute of Technology (SVNIT), Gujarat. Session 2 gave a brief overview of the conceptual design of Wind Turbine. Detailed design aspect is also presented. Once the design is completed, the different kinds of testing at lab level and in the test field are elaborated

Pavan Urja - Tamasoma Jyotirgamaya (Wind Energy - From Darkness towards Light)

An attempt has been made in this special report, to give a brief overview, in Hindi, of the important aspects of wind energy and wind turbines. The history of wind turbines has been described. The wind potential of India and other countries has been addressed and the different types of wind turbines, which could harness this valuable renewable energy resource, described. In particular, the general constructional details of a typical horizontal-axis wind turbine have been given. The aerodynamic theories related to the capture of wind energy by such wind turbines have been briefly explained. The key intention of publishing this special report in Hindi is to create keen awareness among the common Indian citizens, of the importance of wind energy and the key technologies needed in India to harness it. The NAL wind turbine development program has also been described

Session 1 : Wind Energy Overview & Wind Resource Assessment (Power point Presentation)

A two day's AICTE sponsored Staff Development Programme on Wind Energy was organized at Sardar Vallabhbhai National Institute of Technology (SVNIT), Gujarat. Session 1 gave a brief overview of Wind Energy and brought out the importance of wind energy as a promising Renewable source of energy. The first step in harnessing wind energy is Wind Resource Assessment. Understanding of wind and its characteristics was presented. A brief description of Wind Resource Assessment and a generalized methodology is also explained

Session 3 : Wind Turbines - Novel designs and retrofitting NAL's India Specific Wind Turbine Programmes (Power point Presentation)

A two day's AICTE sponsored Staff Development Programme on Wind Energy was organized at Sardar Vallabhbhai National Institute of Technology (SVNIT), Gujarat. Session 3 dealt with description of unconventional wind turbine designes and approaches. NAL's India specific wind turbine program was explained in the second half of the session. An indigenous effort put by NAL to harness wind energy in Indian geographical topology was explained

Pavan Urja : Tamasoma Jyotirgamaya Wind Energy : From Darkness towards Light

An attempt has been made in this article, to give a brief overview, in Hindi, of the important aspects of wind energy and wind turbines. The history of wind turbines has been described. The wind potential of India and other countries has been addressed and the different types of wind turbines, which could harness this valuable renewable energy resource, described. In particular, the general constructional details of a typical horizontal-axis wind turbine have been given. The key intention of publishing this special report in Hindi is to create keen awareness among the common Indian citizens, of the importance of wind energy and the key technologies needed in India to harness it. The NAL wind turbine development program has also been described

NAL's Contribution to Wind Energy Technology and its Application

A presentation given at the Three day CEP course on Wind Energy Technology organized by Energy System Engineering, Indian Institute of Technology, Bombay, under the Continuing Education and Quality Improvement Program, April 16 - 18, 2007. The presentation gives a birds eye view of NAL's activities related to Wind Turbine Technologies and its application since its establishment in 1959

NAL's Contribution to Wind Energy Technology and its Application

A presentation given at the Three day CEP course on Wind Energy Technology organized by Energy System Engineering, Indian Institute of Technology, Bombay, under the Continuing Education and Quality Improvement Program, April 16 - 18, 2007. The presentation gives a birds eye view of NAL's activities related to Wind Turbine Technologies and its application since its establishment in 1959

Aerodynamic design & analysis of the Innovative Tip Brake of the NMITLI 500 kW Horizontal-Axis Wind Turbine

The present report consolidates the aerodynamic sizing of an innovative tip brake. The innovativeness in the design lies in the fact that the tip brake, in the braking position, not only provides a braking surface to retard the rotor, but also spoiles the flow over the outboard portion of the wind turbine rotor lifting aerofoil blade. At the same time, in its non-braking position, when the flaps are inline with the main blade, it acts as leading edge flaps and trailing edge slats and thereby augments the power to consequently improve the performance of the rotor. The present report consolidates the aerodynamic design and analysis of the primary tip brake and spoiler flaps that has been worked out for the braking mode. The augmentation due to the presence of the flaps in the non braking mode has also been worked out. The loads during the braking (aerodynamic pressure / loads acting on the surface of the tip brake) have been quantified. The sizing was done for three configurations of the aerodynamic brake with different primary tip brake width (0.6 m, 1 m, 1.25 m and 1.5 m). Finally, after intra-divisional discussions, the final configuration with primary tip brake width of 1.5 m was chosen for further structural design

Recurrence studies of insect-sized flapping wings in inclined-stroke plane under gusty conditions

Global recurrence plots (GRPs) and windowed recurrence quantification analysis (WRQA) are two recurrence paradigms which find wide applications to detect the onset of instability in a dynamic system. The present work reports the attempt to employ these recurrence paradigms to assess the effect of frontal gust on the force patterns of an insect-sized flapping wing in the inclined-stroke plane. Horizontal and vertical forces generated by the flapping wing in the presence of gusts of the form uGuw=u∞uw+(uguw)sin(2πfgfwt) were numerically estimated in the 2D reference frame for Re = 150. Nine gusts with combinations of the ratio of gust frequency to wing’s flapping frequency, fg/fw = 0.1, 0.5 and 1 and ratio of gust velocity amplitude to root mean square averaged flapping velocity, ug/uw = 0.1, 0.5 and 1 were considered. Recurrence studies of the forces were carried out to find out the gusty condition, which would trigger an onset of unstable behaviour. Studies indicated a possible onset of instability in the force patterns for gust with fg/fw = 0.1 and ug/uw = 1. The onset of unstable behaviour was prominently captured by WRQA of the vertical force coefficient based on determinism (DET) and laminarity (LAM) serie