The Influence of Wetting of Flow Passage Surfaces in Pumps-as-Turbines on Their Energetic Characteristics

Volkov, A. Iu.; Ryzhenkov, A. V.; Vikhlyantsev, A. A.; Druzhinin, Anatoly; Cherepanov, S P; Šoukal, Jiří; Sedlář, Milan; Komárek, Martin; Pochylý, František; Rudolf, Pavel; Fialová, Simona

doi:10.14445/22315381/ijett-v68i11p203

Cited by 2 publications

(1 citation statement)

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“…The analysis of literature (Grant et al, 2015;Ivanov, 2020;Volkov et al, 2020) also showed that LED beacons with different color temperatures of 1 W and 3 W power are used most often in fires, their technical parameters are given in Table 7. The results of the research to determine the efficiency of luminous flux penetration in a highdensity smoke environment with different combinations of LEDs showed that the most visible is a fire beacon with a combination of LEDs -2 pcs red 1 W and 2 pcs cold white 3 W (Grant et al, 2015).…”

Section: Worn On the Helmetmentioning

confidence: 99%

Lighting and orientation-lighting fire equipment: Trends and prospects

Hai¹

2023

Int. j. adv. appl. sci.

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The purpose of the article is to carry out an analysis of modern fire-fighting equipment and lighting accessories based on a review of scientific journals and technical passports of lighting equipment. A comparative analysis of fire-fighting helmets in the aspect of comparison of lighting accessories has been carried out in the article; factors that should be considered when choosing lighting equipment have been determined. A comparative analysis of qualitative and technical characteristics of fire-fighting lanterns and their positive and negative sides have been carried out based on these factors. The characteristics of auxiliary lighting equipment have been described. The materials of the study included works published during the last eleven years which made it possible to present the latest finding on the study subject and to draw the relevant for future studies conclusions. The results of the study allowed outlining the significance of the lighting and orientation of light fire equipment in eliminating fires and rescuing victims (both civilians and fire service personnel). The main functional and technical advantages and disadvantages of the widely used equipment are highlighted in the study.

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Section: Worn On the Helmetmentioning

confidence: 99%

Lighting and orientation-lighting fire equipment: Trends and prospects

Hai¹

2023

Int. j. adv. appl. sci.

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Application of a multi-tiered blade system for reversible hydromachines of PSPP

Liamasov

Волков

Denisov

et al. 2022

Nadežn. bezop. ènerg.

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The use of reversible hydraulic machines is often the most cost-effective option in most pumped storage configurations. At the same time, among reversible machines, radial-axial pump-turbines are most often used. This is due to the fact that such hydraulic turbines are capable of operating at high pressures, which are used in pumped storage power plants. The impellers of such reversible machines have a rigid-blade system, that is, they are not able to change their position, like the blades of axial and diagonal rotary-blade hydraulic turbines. What makes the problem in the design of pump-turbines is that, due to the different influence of hydraulic resistances, the optimum in pumping and turbine modes is different. This is taken into account in the design and determines both geometric and operational parameters. As a result, the maximum impeller diameter calculated for the pumping mode does not correspond to the optimal turbine geometry. At the same time, it is the turbine mode that should have the maximum efficiency, since the cost of peak electricity is higher than the cost of energy during the hours of dips in the daily load schedule corresponding to the pumping mode. In order to design the impeller-pump of the turbine optimally for the turbine mode, it is necessary for the same impeller to develop a greater pressure in the pumping mode of operation. To increase the pressure in the pumping mode, multi-tiered paddle grids can be used. This paper discusses the effect of additional tiers of hydrodynamic grids on the turbine regime and the prospects for their modernization in conjunction with other well-known technical solutions to increase the pressure and expand the operating area of HPP hydroelectric units.

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The Influence of Wetting of Flow Passage Surfaces in Pumps-as-Turbines on Their Energetic Characteristics

Cited by 2 publications

References 0 publications

Lighting and orientation-lighting fire equipment: Trends and prospects

Lighting and orientation-lighting fire equipment: Trends and prospects

Application of a multi-tiered blade system for reversible hydromachines of PSPP

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