Aditi Rana

Bio: Aditi Rana is an academic researcher from Army Institute of Technology, Pune. The author has contributed to research in topics: Wind direction & Wind gradient. The author has an hindex of 4, co-authored 5 publications receiving 104 citations.

Empirical model of flicker due to vertical wind shear instigated by civilization in a seashore wind turbine using wind tunnel

Abstract: In this paper, specifics of impact of sea shore environment on vertical wind shear and congruently on flicker in wind turbine which is sited on that surface is reverberated. This is achieved in a laboratory wind tunnel with artificial surfaces created in a wind tunnel. The various surfaces imitated in the wind tunnel are sea sand of various sizes. Wind turbine is tested for these diverse types of surface roughness. Empirical model of flicker reflecting vertical wind shear at sea shore is established. Conjectures made while proposing the empirical model are reverberated. Boundary verges of the projected empirical model are echoed. Comparative graphs of flicker initiated due to vertical wind shear because of various sizes of sands on the seashore are portrayed. Values of flicker with projected empirical model and flicker from wind tunnel test are closer.

Computation of flicker due to vertical wind shear in a wind turbine sited on a hill using wind tunnel

Abstract: In the paper empirical model of flicker initiated in a wind turbine sited on a hill is established. Paper offers ins and outs of impact of various shapes of hills on vertical wind shear and consequently on the flicker produced in the wind turbine which is sited on that surface. In the model vertical wind shear, length of the turbine blade, tower height, slope of the hill are reverberated. The exquisiteness of the model is that, it is expedient to sundry types of hills on which the turbine is sited. Postulations, boundary curbs and limitations of the model are also depicted.

Modeling of flicker due to vertical wind shear initiated by vegetation in a riverside wind turbine using wind tunnel

Abstract: The paper reveals niceties of impact of river bank environment on vertical wind shear and subsequently on flicker in wind turbine which is sited on that surface. This is accomplished in a laboratory wind tunnel with artificial surfaces created in a wind tunnel. The various surfaces imitated in the wind tunnel are river sand, various sizes of pebbles of river bank, flowing water of river at high speed, flowing water of river at low speed etc. Wind turbine is tested for these sundry kinds of surface roughness. Here emphasis is given on establishment of empirical model of flicker initiated owing to vertical wind shear instigated because of sundry surface roughness of river bank topography. Values of flicker with projected empirical model and flicker from wind tunnel test are closer.

Modeling of flicker in wind turbine on a green building due to vertical wind shear

Abstract: Paper confers a newfangled empirical model to figure, flicker, instigated in the horizontal axis, upwind turbine, due to vertical wind shear, in continuous operation. Postulations, boundary curbs and limitations of the model are also depicted. In the proposed model, vertical wind shear, number of blades, blade length and tower height are echoed. The elegance of the model is that, it is expedient to range of heights of buildings on which the turbine is sited. Substantiation of model is carried out with comparative graphs revealed after fervent experimentation on a turbine in a tunnel with various heights of models of buildings.

Ultracapacitors: Why, How, and Where is the Technology

Abstract: The science and technology of ultracapacitors are reviewed for a number of electrode materials, including carbon, mixed metal oxides, and conducting polymers. More work has been done using microporous carbons than with the other materials and most of the commercially available devices use carbon electrodes and an organic electrolytes. The energy density of these devices is 3¯5 Wh/kg with a power density of 300¯500 W/kg for high efficiency (90¯95%) charge/discharges. Projections of future developments using carbon indicate that energy densities of 10 Wh/kg or higher are likely with power densities of 1¯2 kW/kg. A key problem in the fabrication of these advanced devices is the bonding of the thin electrodes to a current collector such the contact resistance is less than 0.1 cm2. Special attention is given in the paper to comparing the power density characteristics of ultracapacitors and batteries. The comparisons should be made at the same charge/discharge efficiency.

Computation of flicker due to vertical wind shear in a wind turbine sited on a hill using wind tunnel

Abstract: In the paper empirical model of flicker initiated in a wind turbine sited on a hill is established. Paper offers ins and outs of impact of various shapes of hills on vertical wind shear and consequently on the flicker produced in the wind turbine which is sited on that surface. In the model vertical wind shear, length of the turbine blade, tower height, slope of the hill are reverberated. The exquisiteness of the model is that, it is expedient to sundry types of hills on which the turbine is sited. Postulations, boundary curbs and limitations of the model are also depicted.

Modeling of flicker in wind turbine on a green building due to vertical wind shear

Abstract: Paper confers a newfangled empirical model to figure, flicker, instigated in the horizontal axis, upwind turbine, due to vertical wind shear, in continuous operation. Postulations, boundary curbs and limitations of the model are also depicted. In the proposed model, vertical wind shear, number of blades, blade length and tower height are echoed. The elegance of the model is that, it is expedient to range of heights of buildings on which the turbine is sited. Substantiation of model is carried out with comparative graphs revealed after fervent experimentation on a turbine in a tunnel with various heights of models of buildings.

Investigation of Horizontal and Vertical Wind Shear Effects Using a Wind Turbine Emulator

Abstract: This paper presents modeling and analysis of horizontal and vertical wind shear effects using a wind turbine emulator (WTE) with a comprehensive model. These periodic effects generate power fluctuations and mechanical stress on the wind turbine (WT) components during its operation. The frequency of these fluctuations associates with the rotation speed and the number of blades, whereas the amplitude increases in larger turbines. Although the vertical wind shear effect was modeled in literature using WTEs, the simplified aerodynamic and mechanical models were considered for WTs. In this paper, in addition to the vertical wind shear, the horizontal wind shear is modeled in simulation and experiment using a WTE, which may have more severe effects. The utilized WTE employs a comprehensive model for the WT, which considers aerodynamic, mechanical, and electrical aspects. The interaction of different aspects and mechanical dynamics is included in the WTE, which utilizes AeroDyn and FAST software tools to model the aerodynamic and the mechanical aspects of the WT. A coupled induction motor-induction generator set was employed to develop the WTE, which is used to model the wind shear effects for a fixed-speed WT.