Temat: air-jet - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Diagnosis of damage to the ventilation system
Autorzy:: Voznyak, Orest
Spodyniuk, Nadiia
Sukholova, Iryna
Dovbush, Oleksandr
Kasynets, Mariana
Datsko, Oleksandra
Tematy:: air distribution
damages
swirled air jet
compact air jet
flat air jet
dystrybucja powietrza
uszkodzenie
strumień powietrza
system wentylacyjny; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Powiązania:: https://bibliotekanauki.pl/articles/1840873.pdf Link otwiera się w nowym oknie
Opis:: The article is devoted to solving of urgent problem to eliminate damages of two types in ventilation systems for air distribution efficiency increasing in the premises by swirled air flow, compact air jet, flat air stream and rectangular air jet. A mathematical model of air supply with swirled air flow, compact air jet, flat air jet and rectangular air stream in the room has been developed. It is shown that in order to achieve the maximum efficiency of air distribution it is necessary to ensure its supply by jets. Graphical and analytical dependences on the basis of the conducted experimental research are presented. Parameters of swirled air flow, compact air jet, flat air stream and rectangular air jet during the formation of a comfortable indoor climate are determined. The results of experimental studies of air supply to the room by the air distribution devices, which form a swirled air flow, compact air stream, flat air flow and rectangular air jet with adequate turbulence and long range of the supply air flow, are presented. It is established that with the increase of the angle of swirling plates inclination and ratio of the slit sides the air jets long range increases.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Diagnosis of damage to the ventilation system
Autorzy:: Voznyak, Orest
Spodyniuk, Nadiia
Sukholova, Iryna
Dovbush, Oleksandr
Kasynets, Mariana
Datsko, Oleksandra
Tematy:: air distribution
damages
swirled air jet
compact air jet
flat air jet
dystrybucja powietrza
uszkodzenie
strumień powietrza
system wentylacyjny; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Powiązania:: https://bibliotekanauki.pl/articles/1840850.pdf Link otwiera się w nowym oknie
Opis:: The article is devoted to solving of urgent problem to eliminate damages of two types in ventilation systems for air distribution efficiency increasing in the premises by swirled air flow, compact air jet, flat air stream and rectangular air jet. A mathematical model of air supply with swirled air flow, compact air jet, flat air jet and rectangular air stream in the room has been developed. It is shown that in order to achieve the maximum efficiency of air distribution it is necessary to ensure its supply by jets. Graphical and analytical dependences on the basis of the conducted experimental research are presented. Parameters of swirled air flow, compact air jet, flat air stream and rectangular air jet during the formation of a comfortable indoor climate are determined. The results of experimental studies of air supply to the room by the air distribution devices, which form a swirled air flow, compact air stream, flat air flow and rectangular air jet with adequate turbulence and long range of the supply air flow, are presented. It is established that with the increase of the angle of swirling plates inclination and ratio of the slit sides the air jets long range increases.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Diagnosis of three types damages to the ventilation system
Autorzy:: Voznyak, Orest
Spodyniuk, Nadiia
Sukholova, Iryna
Savchenko, Olena
Kasynets, Mariana
Datsko, Oleksandra
Tematy:: air distribution
air velocity
swirled air jet
compact air jet
flat air jet
dystrybucja powietrza
prędkość powietrza
system wentylacyjny
diagnostyka; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Powiązania:: https://bibliotekanauki.pl/articles/2096172.pdf Link otwiera się w nowym oknie
Opis:: The article is devoted to solving of urgent problem to eliminate damage in ventilation system. That is caused by non-adequate long range, stagnant unventilated areas in the room existance and high noise level in the premises at air distribution by swirled air flow, compact air jet, flat air stream and rectangular air jet. A noise level of air supply with swirled air flow, compact air jet, flat air jet and rectangular air stream in the room has been investigated. It is shown that in order to achieve the maximum noise level decreasing it is necessary to ensure its supply by jets, which less intensively attenuate before entering the premise working area. Results of the experimental research are presented as graphical and analytical dependences. The acoustic properties of the swirled air flow, compact air jet, flat air stream and rectangular air jet have been investigated and means of situation improving have been determined. The results of experimental research of air supply to the room are presented. It is established that with the increase of the angle of swirling plates inclination and ratio of the slit sides the air jets noise level decreases.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: A Device for Preventing Occupational Diseases of Lower Legs
Autorzy:: Kristjuhan, U.
Reedik, V.
Tahemaa, T.
Tematy:: air jet massage
ower leg
fatigue
nogi
zmęczenie
masaż; Pokaż więcej
Wydawca:: Centralny Instytut Ochrony Pracy
Powiązania:: https://bibliotekanauki.pl/articles/90820.pdf Link otwiera się w nowym oknie
Opis:: Physiological processes characteristic of the fatigue of legs mainly appear when the worker’s activity requires standing. If the processes are intensive and regular, various diseases of legs, such as varicose veins and musculoskeletal disorders of legs and feet, can develop. Therefore, methods of reducing the fatigue of legs are important in occupational health protection. Air jet massage technology was developed and an appropriate massage device was built by the authors. The massage head turning around the lower leg and moving up and down gradually covers the leg’s surface. To determine the efficiency of the massage, fatigue processes were studied. These studies showed that jet massage effectively reduces both the subjective and objective fatigue symptoms. The device is convenient for use in industry, services, and at home.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Influence of air cooling and air-jet vortex generator on flow structure in turbine passage
Autorzy:: Szwaba, R.
Flaszyński, P.
Szumski, J. A.
Doerffer, P.
Tematy:: shock wave
separation control
air-jet vortex generator
blade cooling; Pokaż więcej
Wydawca:: Politechnika Gdańska
Powiązania:: https://bibliotekanauki.pl/articles/1938634.pdf Link otwiera się w nowym oknie
Opis:: The paper concerns the experimental investigations and numerical simulations of a high loaded model of a turbine blade. An increase in the blade load leads to enlargement of a local supersonic zone terminated by a shock wave on the suction side. The Mach number upstream of the shock reaches up to 1.6. The interaction of the shock wave with a boundary layer at such a high Mach number leads to a strong separation. Streamwise vortices generated by air-jets were used for the interaction control. The work presents the experimental and numerical results of the application of an air-jets vortex generator on the suction side of cooled turbine blades. Very interesting results were obtained in the context of the air cooling and air-jet vortex generator influence on the flow structure in the turbine passage.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: The study of the continuously rotating detonation combustion chamber supplied with different types of fuel
Autorzy:: Łukasik, B.
Czyż, S.
Irzycki, A.
Rowiński, A.
Tematy:: rotating detonation
air/Jet-A detonation
detonation combustion chamber
internal combustion engine; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/246684.pdf Link otwiera się w nowym oknie
Opis:: The paper summarizes research that was conducted last year as part of the project of “Turbine engine with detonation combustion chamber”. In this project, throughout 2012 and early 2013, tests were carried out on a test stand connected to the compressed air system. Research, of the rotating detonation phenomena, was carried out for a number of detonation chambers with different interior channel geometry. In addition, for each geometry configuration, tests were carried out for different levels of choking of the chamber outlet and hence for different pressures conditions inside the detonation chamber. This article presents the results of tests carried out for gaseous (hydrogen), hybrid (hydrogen + kerosene) and liquid (Jet-A) fuels, using different types of fuel injectors and for different fuel injection configuration settings (inside the chamber, or in front of the chamber). During these tests, parameters such as pressure behind the detonation wave (using piezoelectric sensors), the static pressure in front of and inside the detonation chamber and temperature: before, inside and at the outlet of the chamber, were measured. Research was performed for the various mass flow rates of air and fuel injected into the chamber that means for the different air-fuel equivalence ratios (Lambda). The main achievement of this study was to obtain a stable and reproducible rotating detonation of air and heated kerosene (Jet-A) mixture, thus the results presented in this paper presents mainly these tests as the most interesting to the reader
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Młyny powietrzno-strumieniowe stosowane w przeróbce wybranych materiałów ziarnistych
Air-jet mills used in mineral processing of chosen granular materials
Autorzy:: Zbroński, D.
Tematy:: materiał ziarnisty
rozdrabnianie
młyny powietrzno-strumieniowe
comminution
granular material
air-jet mills; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:: https://bibliotekanauki.pl/articles/349478.pdf Link otwiera się w nowym oknie
Opis:: Zaspokojenie popytu przemysłowego na materiały drobnoziarniste stało się źródłem dynamicznego rozwoju technologii powietrzno-strumieniowych. W artykule zaprezentowano podział młynów powietrzno-strumieniowych i opis wybranych ich typów. Różnica między młynami wynika głównie ze sposobu prowadzenia procesu rozdrabniania, konstrukcji układu mieląco-klasyfikującego i zastosowanego producenta młyna. Przedstawione wyniki rozdrabniania wybranych materiałów ziarnistych w poszczególnych rodzajach młynów potwierdziły możliwość uzyskania produktu o wymaganym uziarnieniu na danym etapie procesu przeróbczego.
The satisfaction of industrial demand on the fine-grained materials caused the dynamic development of air-jet technologies. The division of air-jet mills and description of chosen their types are presented in the paper. The difference between mills mainly depends from method realization of comminution process, used milling-classify system and producer of mill. The experimental results of chosen granular materials comminution in the several types of mills confirmed the possibility obtainment of required particle size distribution of product on the definite stage of mineral processing.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Cold Zone Exploration Using Position of Maximum Nusselt Number for Inclined Air Jet Cooling
Autorzy:: Ingole, S. B.
Sundaram, K. K.
Tematy:: jet impingement
inclined jet
cold zone
air jet cooling
uderzenie strumienia
strumień nachylony
strefa zimna
chłodzenie strumieniem powietrza; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/139691.pdf Link otwiera się w nowym oknie
Opis:: Inclined jet air cooling can be effectively used for cooling of electronics or other such applications. The non-confined air jet is impinged and experimentally investigated on the hot target surface to be cooled, which is placed horizontally. Analysis and evaluations are made by introduction of a jet on the leading edge and investigated for downhill side cooling to identify cold spots. The jet Reynolds number in the range of 2000 ≤ Re ≤ 20 000 is examined with a circular jet for inclination (θ) of 15 less than θ less than 75 degree. Also, the consequence of a jet to target distance (H) is explored in the range 0.5 ≤ H/D ≤ 6.8. For 45 degree jet impingement, the maximum Nusselt number is widely spread. Location of maximum Nusselt number is studied, which indicates cold spots identification. At a higher angle ratio, the angle is the dominating parameter compared to the Reynolds Number. Whereas at a lower angle ratio, the inclined jet with a higher Reynolds number is giving the cooling point away from leading edge. It is observed that for a particular angle of incident location of maximum Nusselt Number, measured from leading edge of target, is ahead than that of stagnation point in stated conditions.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Influence of initial turbulence on characteristics of air jets
Wpływ turbulentności początkowej na charakterystyki strumieni powietrznych
Autorzy:: Voznyak, O.
Tematy:: turbulencja początkowa
strumień powietrza
przepływ powietrza
temperatura
dystrybutor powietrza
initial turbulence
air jet
air flow
temperature
air distribution device; Pokaż więcej
Wydawca:: Politechnika Częstochowska
Powiązania:: https://bibliotekanauki.pl/articles/2068033.pdf Link otwiera się w nowym oknie
Opis:: In this article the results of air distribution device with opposite non-coaxial air jets interaction and also air distribution device with swirl air jets investigations are presented. Research concerns the air flow velocity and temperature decreasing coefficients determination and also both noise level and aerodynamic resistance coefficient were considered.
W artykule przedstawiono wyniki badań urządzeń do nawiewu powietrza. Badania dotyczą współczynników zmniejszania prędkości oraz temperatury strumieni powietrza, a także hałasu oraz współczynników oporu aerodynamicznego.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Analysis of premise infrared heating and ventilation with an exhaust outlet and flat decking air flow
Autorzy:: Voznyak, Orest
Spodyniuk, Nadiia
Savchenko, Olena
Dovbush, Oleksandr
Kasynets, Mariana
Datsko, Oleksandra
Tematy:: infrared heater
air distribution
air velocity
flat air jet
flow rate
promiennik podczerwieni
dystrybucja powietrza
prędkość powietrza
natężenie przepływu; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Powiązania:: https://bibliotekanauki.pl/articles/2096185.pdf Link otwiera się w nowym oknie
Opis:: The article is devoted to solving of urgent problem to analyse energy saving effect from radiant heating and ventilation of premise with exhaust outlet and flat decking air jet. The aim of the work is analysis of energy efficiency of radiant heating systems using infrared heaters and ventilation of the premise due to the effect of a flat decking air jet on the surface of the heater; determination the amount of heat received both by flat decking air jet from the infrared heater when laying on its flat surface and amount of heat from the exhaust air entering the recuperator. Use of the infrared heaters in combination with an air distribution of the ventilation system with the flat decking air jets is effective, as it allows to achieve savings in heat load of the ventilation system in the range of 11%-19%. The amount of heat recovery of the exhaust air removed by the exhaust outlet is 30-40 W that equals 15%-20%. Saving the heat load of the ventilation system allows reducing the actual initial temperature of the tidal flat decking air jet and achieving a total saving of thermal energy of 24%-34%.
Dostawca treści:: Biblioteka Nauki

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