Temat: experimental bench - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Analysis of dynamic characteristics of an experimental bench of high-pressure water fracturing assisted cutting
Autorzy:: Liu, Zhiming
Zhang, Qiang
Sun, Yuliang
Liu, Junming
Powiązania:: https://bibliotekanauki.pl/articles/2200892.pdf
Data publikacji:: 2023
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: high-pressure water fracturing
experimental bench
dynamic characteristics
Opis:: Aiming at the problem that the cutting efficiency of a drum shearer is low when mining hard coal seams, an experimental bench of high-pressure water fracturing assisted cutting is designed. Compared with normal ones, the maximum equivalent stress of the improved experimental bench is reduced by 55.38%, and the maximum total deformation is reduced by 27.23%. According to the results of dynamic response analysis, it is concluded that the experimental bench of high-pressure water fracturing assisted cutting is stable and reliable under extreme working conditions, and meets design requirements for strength and stiffness.
Źródło:: Journal of Theoretical and Applied Mechanics; 2023, 61, 2; 317--330
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Experimental study of the solid fouling effect on the air-cooled apparatus characteristics
Autorzy:: Morozyuk, Larisa
Sokolovska-Yefymenko, Viktoriia
Moshkatiuk, Andrii
Hrudka, Bohdan
Powiązania:: https://bibliotekanauki.pl/articles/2014236.pdf
Data publikacji:: 2021
Wydawca:: Państwowa Wyższa Szkoła Zawodowa w Tarnowie
Tematy:: air condenser
fouling
experimental bench
heat exchange surface
chłodnica powietrza
zanieczyszczenie
stanowisko doświadczalne
powierzchnia wymiany ciepła
Opis:: External fouling on the heat exchange surface of air-cooled apparatus are formed during operation, which leads to a significant increase in energy consumption and deviations from the optimal operating mode of the entire system. This phenomenon is a problem for all energy conversion systems. This paper presents the experimental study results of a complex of a commercial cooled object with real fouling on the air condenser surface. To study the effect of fouling, an experimental bench was developed – a single-stage refrigerating machine that provides cold supply to a thermostatic chamber. Three types of fouling were used: sand, fluff and dust. Fouling were picked from the operating condensers and identical in the type of heat exchange surface to the experimental sample. With a change in the quantitative and qualitative composition of the fouling, the air condenser thermal and aerodynamic characteristics and the energy efficiency of the machine as a whole were determined. The experiment showed that at maximum fouling of the heat exchange surface with sand and fluff, air movement stops. This means that at a certain thickness of sand and fluff layer, an air impermeable dense structure is formed. Dust with the same form of filling the free space for the flow remains permeable to air. Experiments showed that the qualitative composition of the fouling is the main factor that determines the heat exchanger performance. It was found that from the experimental set of fouling, roadside dust has the greatest negative effect on the condenser characteristics and the machine as a whole. The aerodynamic properties of the heat exchanger depend to some extent on the qualitative composition of the fouling. As a conclusion, it was suggested that the process nature of air flow passing through the investigated fouling can be described as gas flows in porous media.
Źródło:: Science, Technology and Innovation; 2021, 12, 1; 1-9
2544-9125
Pojawia się w:: Science, Technology and Innovation
Dostawca treści:: Biblioteka Nauki

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