scholarly journals Investigation of the Operating Principle of Diffuser Augmented Hydrokinetic Turbines

2021 ◽  
Vol 774 (1) ◽  
pp. 012138
Author(s):  
Christa Stadler ◽  
Jonas Wack ◽  
Stefan Riedelbauch
Keyword(s):  
Operating Principle ◽  
Hydrokinetic Turbines

Simulating and Designing Small Hydrokinetic Turbines: a Review

2018 ◽  
Vol 12 (11) ◽  
pp. 876
Author(s):  
Ana M. Ramirez-Tovar ◽  
Yuri Ulianov López Castrillón ◽  
Santiago Laín
Keyword(s):  
Hydrokinetic Turbines

Research on a Novel Miniature Air Compressor Generating both Compressed Air and Vacuum

2014 ◽  
Vol 1027 ◽  
pp. 253-256
Author(s):  
Jian Hai Han ◽  
Jie Zhang ◽  
Dong Liao Fu ◽  
Zhi Gang Hu
Keyword(s):  
Vacuum Pump ◽  
Operating Principle ◽  
Experimental Results ◽  
System Structure ◽  
Compressed Air ◽  
The Novel ◽  
Pump Mode ◽  
Air Compressor

A new kind of miniature air compressor is proposed in this paper. This compressor can produce both compressed air and vacuum. The system structure, operating principle and experimental characteristics of the novel miniature air compressor are described in detail. The experimental results prove that the shift between air compressor mode and vacuum pump mode is possible and the design of system structure is appropriate.

scholarly journals Optimised calibration programmes for comparators for instrument transformers

2021 ◽  
Vol 88 (2) ◽  
pp. 122-131
Author(s):  
Christian Mester
Keyword(s):  
Experimental Study ◽  
Operating Principle ◽  
Device Under Test ◽  
Operating Range ◽  
Ratio Error ◽  
Phase Displacement ◽  
Instrument Transformers ◽  
Instrument Transformer ◽  
Method Of Measurement

Abstract Traditionally, instrument transformers are calibrated using bridges. By definition, bridges use the null method of measurement. The traditional calibration programme for instrument transformer bridges characterise namely this null measurement. Many new commercial comparators for instrument transformer use a very different method. They sample the secondary signals of reference and device under test (dut) transformer independently. Based on the samples, magnitude and phase of both signals are determined. Ratio error and phase displacement are calculated. Consequently, the significance of their calibration using the traditional calibration programme is limited. Moreover, the operating range of modern comparators is much larger than that of bridges. The additional versatility cannot be used without an adapted calibration programme. This article analyses the calibration programmes for both technologies. An experimental study confirms both the suitability of the new calibration programme and the need to chose the calibration programme depending on the technology of the device to be calibrated. The conclusion is very general and applies to all measurement problems where an operating principle is replaced by another – when changing the operating principle, it is important to check the calibration programme and adapt it if necessary.

scholarly journals Underwater Power Kites

2017 ◽  
Vol 139 (06) ◽  
pp. 38-43
Author(s):  
David J. Olinger
Keyword(s):  
Low Cost ◽  
Power Grid ◽  
Offshore Wind ◽  
Turbine Generator ◽  
Research Teams ◽  
Offshore Wind Turbines ◽  
Hydrokinetic Turbines ◽  
Available Technology ◽  
Economic Analyses ◽  
The Cost

This article discusses different features of underwater kites and its advantages in the turbine industry. The underwater kite moves fastest when it slaloms through the current in this way, much like a water skier. Electricity generated by the mounted turbine generator is transmitted along the tether to a moored, floating buoy, and then onto the power grid. This concept, now known as the Tethered Undersea Kite (TUSK), was first conceived by Magnus Landberg, a researcher in Sweden, in 2007. Underwater kites look to be feasible to build using commercial available technology. According to economic analyses conducted by other research teams, TUSK systems may be able to produce electricity at about half the current cost for fixed hydrokinetic turbines, and a bit below the cost of the power produced by offshore wind turbines. Those researchers attribute the lower costs to improved power-to-weight ratios derived from replacing the inner blades and support tower of a traditional turbine with a lightweight, low-cost tether.

Flow and Performance Characteristics of a Double-Blade Hydrofoil

2012 ◽  
Vol 433-440 ◽  
pp. 7218-7222 ◽  
Author(s):  
Tahir Yavuza ◽  
Birol Kilkis ◽  
Emre Koc ◽  
Ozgur Erol
Keyword(s):  
Wind Power ◽  
Fossil Fuels ◽  
Clean Energy ◽  
Performance Characteristics ◽  
Energy Resources ◽  
Environmental Crisis ◽  
Operational Effectiveness ◽  
Hydrokinetic Turbines ◽  
The World ◽  
And Performance

While our planet is rapidly approaching an environmental crisis under the dominant use of depleting fossil fuels, the need for exploiting all forms of new, small carbon foot-print, renewable, and clean energy resources are increasing in the same proportion. Therefore, the need for exploring all types of clean energy resources that the world has- some of which might have not attracted sufficient attention before- is essential in order to implement sufficient, efficient, and widely use all them. In this respect, operational effectiveness of the wind and hydrokinetic turbines depend on the performance of the airfoils chosen. Using double-blade airfoils in the wind and hydrokinetic turbines, minimum wind and hydrokinetic flow velocities to produce meaningful and practical mechanical power reduces to 3- 4 m /s for wind turbines and 1-1.5 m/s or less for hydrokinetic turbines. Consequently, double-blade hydrofoils may re-define the potentials of wind power and hydrokinetic power of the countries in positive manner.

scholarly journals Barcode based localization system in indoor environment

2014 ◽  
Vol 13 ◽  
pp. 31-36
Author(s):  
Ľubica Ilkovičová ◽  
Ján Erdélyi ◽  
Alojz Kopáčik
Keyword(s):  
Indoor Environment ◽  
Operating Principle ◽  
Quick Response ◽  
Qr Codes ◽  
Localization System ◽  
Accurate Localization ◽  
Intelligent Buildings

Nowadays, in the era of intelligent buildings, there is a need to create indoornavigation systems, what is steadily a challenge. QR (Quick Response) codesprovide accurate localization also in indoor environment, where other navigationtechniques (e.g. GPS) are not available. The paper deals with the issues of posi-tioning using QR codes, solved at the Department of Surveying, Faculty of CivilEngineering SUT in Bratislava. Operating principle of QR codes, description ofthe application for positioning in indoor environment based on OS Android forsmartphones are described.

scholarly journals TECHNICAL CHARACTERISTICS AND CONSTRUCTION FEATURES OF MEAT GRINDERS

2020 ◽  
Vol 8 (Spl-2-AABAS) ◽  
pp. S361-S367
Author(s):  
Yermek Abilmazhinov ◽  
◽  
Galiya Abdilova ◽  
Maksim Rebezov ◽  
Rustem Zalilov ◽  
...  
Keyword(s):  
Meat Products ◽  
Industrial Applications ◽  
Operating Principle ◽  
And Performance

Most of the technological operations for the production of meat products are mechanised and carried out using specially designed equipment, including meat grinders. This paper reviews meat grinders of different design and performance, used in both household and industrial applications. The technical characteristics, construction and operating principle of the meat grinder are described.

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