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Visualization study of the flow processes and phenomena in the external gear pump

Antoniak P., Stryczek J.

Archives of Civil and Mechanical Engineering

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2018

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Vol. 18, no. 4

1103--1115

EN

External gear pumps make some of the most frequently used hydraulic energy generators. In spite of the fact that those well known machines feature good operational parameters, the research and development work on the pumps is still going on. There is a number of various research methods applied. One of them, an experimental method, is a visualization study, on which this paper is focused. In this article, the visualization research method has been presented, which has been used for the study of the flow processes and phenomena in the external gear pump. Findings of the research enabled a detailed description of the flow process, namely of the transporting of the working fluid through the pump, in each of the typical zones of the pump. It turns out that a characteristic feature of the process is the occurrence of various cavitation phenomena. All characteristic cavitation forms, as well as the degrees of their intensity, observed during the research, have been catalogued and specifically described. The research also made it possible to identify the critical areas of the pump, which, consequently, allowed the development of specific design, construction and operational recommendations. A result of applying those recommendations was a considerable reduction of the intensity of the cavitation phenomena, evidence of which is the experimental study presented in this paper.

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Visualisation research of the flow processes in the outlet chamber–outlet bridge–inlet chamber zone of the gear pumps

Stryczek J., Antoniak P., Jakhno O., Kostyuk D., Kryuchkov A., Belov G., Rodionov L.

Archives of Civil and Mechanical Engineering

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2015

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Vol. 15, no. 1

95--108

EN

This paper is a presentation of the theoretical analysis and visual experimental investigation on flow processes in the inlet chamber, outlet bridge and inlet chamber of the gear pump, commonly known as the trapped volume. In order to achieve that, the size and location of the considered chambers and bridge were determined, and next, the theoretical analysis was carried out. In order to verify the theoretical consideration, an experimental gear pump with transparent (plexi) bodies was designed and built. The pump was tested on a dedicated test stand. The visualisation research conducted for different values of the operational parameters (inlet pressure, temperature, rotational speed) proved the previously carried out theoretical analysis to be correct and, simultaneously, showed that there are areas in the gear pump where the flow processes are seriously disturbed. In order to eliminate the disadvantageous phenomena and processes observed in the pump, a new type of relief grooves was added to the design of the considered area (the solution was developed originally by the authors of this paper), which was consequently theoretically and experimentally examined. The results of both types of the research proved definitely that the application of the relief grooves resulted in a considerable reduction of the negative phenomena and processes in the considered area of the gear pump.

3

Zastosowanie pakietu Alibre Design do projektowania stanowiska badawczego

Słodczyk D., Antoniak P., Leśniewski T.

Górnictwo Odkrywkowe

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2010

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R. 51, nr 4

193-195

PL

Obecnie projektowanie pojedynczych części, jak i całych mechanizmów, przeprowadza się najczęściej korzystając z systemów projektowania 3D. Są to z reguły pakiety drogie, raczej niedostępne dla mniejszych firm. Na rynku jest jednak, także mało znany w Polsce pakiet, który dzięki niskiej cenie, jest dostępny nie tylko dla małych firm ale nawet dla szerokiej rzeszy hobbystów. Tym pakietem jest Alibre Design, którego możliwości zostaną przedstawione na przykładzie projektowania prostego stanowiska badawczego.

EN

Presently, designing individual elements as well as complete mechanisms is mostly conducted by means of the 3D design systems. They are typically expensive packages, rather inaccessible for small firms. However rarely used in Poland, there is a package on the market, which, due to its low price, can be afforded not only by small businesses but even by numerous hobbysts. The name of the package is Alibre Design, possibilities of which will be presented on the example of designing a simple test stand.

4

Konstrukcja pieca do formowania kieszeni rurkowych z fiseliny

Leśniewski T., Antoniak P., Sipa J.

Górnictwo Odkrywkowe

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2010

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R. 51, nr 3

166-169

PL

W artykule przedstawiono projekt pieca będącego częścią automatycznej linii do wytwarzania kieszeni rurkowych z fliseliny, które stosowane są do wytwarzania akumulatorów kwasowo-ołowiowych. Projekt pieca powstał z wykorzystaniem programu SolidWorks, a zastosowane w nim rozwiązania (nie stosowane w dotychczasowej technologii wytwarzania kieszeni) pozwalaj ą na prawie całkowite wyeliminowanie prac ręcznych oraz zwiększenie wydajności i zysków.

EN

In the paper, the Authors present a project of electric furnace which is a part of the automatic line for manufacturing oj tu bular plate separators from polyester for the production of lead-acid accumulators. The project of the furnace arose with mage of the SolidWorks program and applied solutions (unapplied in up to now in technology ofproduction of tubular plates), Iow almost fully eliminate of manual works and increase efficiency and profits.

5

Struktura i odporność na zużycie stali 100Cr6

Leśniewski T., Kowalewski P., Antoniak P., Sipa J.

Tribologia

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2007

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nr 2

407-414

PL

Dokładna znajomość własności materiałów konieczna jest do wykonania elementów maszyn o najlepszych charakterystykach eksploatacyjnych. W referacie przedstawiono wyniki badań metalograficznych związanych z określeniem wpływu struktury materiału na charakterystyki tribologiczne stalowych węzłów ślizgowych. Próby powiązania tej własności z właściwościami tribologicznymi podjęto przez analogie istniejących związków pomiędzy twardością a własnościami mechanicznymi. Na podstawie analizy literatury stwierdzono, że wzrost twardości współpracujących powierzchni ślizgowych powoduje wzrost odporności na ich zużycie. Na podstawie badań ustalono, że ustawienie struktur według wzrastającej twardości, odpowiada zwiększającej się odporności na zużycie. Spośród struktur materiału, ułożonych według wzrostu odporności na zużycie, najlepszą okazała się struktura martenzytyczna o twardości 62 HRC. Z uwagi na zauważoną liniową zależność zużycie - twardość materiału można stwierdzić, iż charakterystyki tribologiczne materiału można prognozować z tym samym skutkiem na podstawie twardości, co i struktury. Takie podejście jest praktyczniejsze chociażby z uwagi na prostsze metody określenia twardości.

EN

Exact knowledge on the materials' characteristics is necessary to make machine elements of the best operational characteristics. In the paper the author present the results of metallographic research aimed at determination of the influence of the material's structure on the tribological characteristics of the steel sliding pairs. Attempts at determinig the relation between this property and the tribological characteristics have been made by analogies of the existing relations between the hardness and the mechanical characteristics. On the basis of analysis of the literature it has been concluded that the increase of the hardness of the collaborating sliding surfaces results in the increased wear resistance of the surfaces. The results of the research made it possible to state that the order of the structures according to the increasing hardness is parallel to the increased wear resistance. Out of the material structures ordered according to the increasing wear resistance, the martensitic structure 62HRC has proven to be the best. Considering the linear interrelation between the wear resistance and hardness of the material, it can be stated that the tribological characteristics of materials can be determined equally precisely by the hardness and by the structure of the materials. This approach is more practical for several reasons, an example of which might be simpler methods of determining the hardness of the materials.