Wyniki wyszukiwania - BazTech

1

Vlianie pul'sacij potoka na poteri gaza v promyslennosti i gazoraspredelitel'nih setah

Tonkonogij U., Padisus A., Stankavicus A., Tonkonogovas A.

Prace Instytutu Nafty i Gazu

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2009

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nr 162

263-268

EN

Flow pulsation in the turbine gas meters cause dynamic error, amounting to tens of percent. So far, the problem has been studied only for pulsations by rarely encountered in practice, simple laws. To calculate the meters' response and dynamic error at pulsing by any arbitrary law the new method has been developed and implemented. It is based on the concept of meters' inertia time constant as the only characteristic of transitional processes of rotation. For the first time the information on the turbine meter behavior under sign alternating pulsation conditions, when the instantaneous flow periodically changes direction on the op-posed one has been obtained. The results has been analyzed and generalized. and compared with the experimental ones obtained with a specially delivered facility. Gas pulsations parameters and the dynamic error have been researched in one of the thermal power plants. The measures have been proposed to reduce pulsing and errors to the acceptable values to avoid vibrations.

2

K voprosy o energeticeskoj effektivnosti primenenia poverhnostnyh razradov dla snizenia aerodinamiceskogo soprotivlenia plohoobtekaermyh tel v dozvukovom potoke

Ivcenko A., Zuravlev O., Sahov V.

Prace Instytutu Nafty i Gazu

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2009

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nr 162

175-181

EN

It is known, that level of the power consumption at the transport vehicle movement is defined by aerodynamic quality of the streamlined surfaces, transverse size of the apparatus and its motion velocity in atmosphere. Herewith, because of phenomena in accordance with separation flow, the significant losses of energy appear at the gas currents around bluff-body element of constrictions. The Traditional methods of the prevention of flow separation zone are connected with problem of optimum profiling of aerodynamic vehicle surfaces. However this often brings to the growth of sizes and weight of the transportation system. One of the ways of aerodynamic features variation without body form change is based on the using of surface discharges plasma [1]. The surface discharges can change viscosity in the gas flow and create the directed stream in near-wall layers [2-3]. In the paper are presented studies experimental results of the processes of the surface discharge action on air stream near cylindrical bodies. The possibility of the aerodynamic drag coefficient reduction (on 20-40%) is shown. By Methods of the voltage-current features, is determined level of the discharge power consumption and it is executed collation its values with magnitude of the reduction of the aerodynamic drag, which exists under discharge plasma influence. The dependency of the energy advantage connected with action of the Non-Arching Surface discharge is considered, when parameters of the electrodes system change at the flow velocities -10...30 m/s.

3

Problemy minimalizacji mocy pobieranej przez układy logiki programowalnej

Dimitrova-Grekov T., Solov'ev V.

Zeszyty Naukowe Politechniki Białostockiej. Informatyka

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2002

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Z.1

21-29

PL

Przedstawiona praca prezentuje problematykę energii w schematach logiki programowalnej. Pokazane są najpopularniejsze aspekty nowoczesnych metod minimalizacji mocy pobieranej przez schematy sekwencyjne. Analiza różnych metod pokazuje w najszerszej perspektywie możliwości badań dotyczących zarządzania energią pobieraną, konsumowaną i traconą.

EN

The problems of the consumed in the sequential logic power also deferent methods of their solving are addressed. Also the low-power techniques, used in different levels of the technology are considered. The aim of the work is to systematize the most popular, known methods and to show the ways of development it at the branch of the programmable logic.