Hydrodynamic transmission operating with two-phase flow

rgl,; Zan,; Velescu, C.; Milo, T.; Manea, A.; Stroi, C.

doi:10.2495/mpf070361

Cited by 3 publications

(3 citation statements)

References 2 publications

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“…Due to their low weight and acceptable mechanical properties, aluminum-based alloys are widely used in industrial applications, including the automotive, aircraft and pleasure craft industries [1,2]. This paper aims to extend the application to parts working in cavitation currents, with complex geometry, such as: propellers [3] for boats and boat engines, as well as rotors for pumps for domestic use [4][5][6][7]. This expansion is possible due to new technologies and mechanical processing equipment according to complex spatial contours, based on numerical control and computer control [8].…”

Section: Introductionmentioning

confidence: 99%

Cavitation behavior study of the aging heat treated aluminum alloy 7075

Luca

Bordeaşu

Ghiban

et al. 2023

J. Phys.: Conf. Ser.

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Aluminium-based alloy type 7075 is known for its good ductility, high mechanical strength, toughness and high fatigue strength, which is why it is mainly used in the construction of dynamically stressed parts in the structure of airplanes, vehicles and ships. Although it has these qualities, at present its behavior has not been studied at the hydrodynamic stresses that allow it to be used in parts that work in cavitation conditions, such as pump rotors and boat propeller blades. Therefore, the research in this paper highlights the behavior of laminated semi-finished structures and obtained by heat treatment of artificial aging at 180°C, with a maintenance time of one hour. Of the 7075 alloy at the demands generated by the vibrating cavity, created by the standard vibrating device with piezoceramic crystals (frequency of 20 kHz, amplitude of 50 µm and electrical power of 500 W). Analysis based on the curves MDE (t) and MDER (t), of the specific parameters of cavitation erosion MDEmax and MDERs as well as of the macro and microscopic images of the eroded structures of cavitation show that, compared to the delivered state (semi-finished), by the heat treatment applied the microstructure does not change cavitation

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Section: Introductionmentioning

confidence: 99%

Cavitation behavior study of the aging heat treated aluminum alloy 7075

Luca

Bordeaşu

Ghiban

et al. 2023

J. Phys.: Conf. Ser.

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“…Aluminum-based alloys, known as hard-aluminum, are widely used in the food, automotive, aviation and marine industries [1,2]. Although, these alloys are known for its usage in parts with low intensity mechanical stresses, the practice has shown, that they also have application in components exposed to hydrodynamically stresses, such as the ones created by cavitation [3][4][5][6][7]. Such components are: aircraft wings and hubs, pump rotors used in domestic wells and in the car engines cooling system, the aft part of the boats where the vortex of the cavitation occurs, such as engine's propellers of the ships and recreation boats.…”

Section: Introductionmentioning

confidence: 99%

Influence of aging heat treatment at 180 °C on cavitation erosion for aluminum alloy type 5083 in cold rolled state

Micu,

Bordeasu,

Dionisie

et al. 2023

J. Phys.: Conf. Ser.

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Aluminum-based alloys have wide applicability in the construction of aircraft, vehicles, and ships. Some of their components, during operation, such as the radiators and the rotors of the cooling pumps in the vehicles, and the propellers of fishing and pleasure boats are affected by the abrasive, chemical and cavitational corrosive action of the water. At certain hydrodynamic flow regimes, the most dangerous becomes the corrosion through cavitation. Operation in such regimes inevitably leads to damaging the structure, due to cyclic stresses of the micro-jets and shock waves generated by the implosion of cavitation bubbles. Although the chemical constitution and alloying with other chemical elements increase the mechanical properties, the service life is still limited when operating in high-intensity cavitation flows. Therefore, researchers are looking for solutions to improve this resistance through various treatments, such as bulk heat. Research heading the same direction, but, made on 5083 alloy, is presented in this paper. The results highlight the behavior of a modified structure compared to the semi-fabricated state (obtained by rolling), through three durations regimes (one hours, 12 hours and 24 hours) of aging heat treatment to 180 °C temperature, after hardening treatment at 450 °C. The cavitation tests were performed in the Laboratory of the Polytechnic University of Timisoara, on the standard vibrating device with piezoceramic crystals. The results were expressed by curves and parameters specific to the evaluation of cavitation resistance, and by macro and microscopic images, showing the unique aspects of the connection between the structure and the mechanical properties obtained through heat treatment regimes. Thus, comparison of the results, including with the delivery state (laminated product), shows that the highest resistance is provided by the treatment at 24 hours. At the same time, the erosion, of pitting and caverns type, and differs from one structure to another.

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“…As a result of extensive studies and researches [1][2][3][4][5], the bronzes have retained their place in industrial applications, especially when exploitation takes place in aggressive chemical environments, such as the propellers of sea and ocean vessels, where the utilization rate has reached about 82%. Alloying with chemical elements and technological processes, developed over time, have given bronzes properties that have led to the manufacture of other components such as [1,3,[8][9][10][11][12]: hydraulic machine rotors, valves, fittings, etc., operating in hydrodynamic, cavitation, which cause degradation by erosion, as a result of the stresses created under the impact with micro-jets and shock waves, generated by the implosion of cavitation bubbles. Obviously, the mechanical and cavitation characteristics of bronzes used in castings are inferior to stainless steels, but naval practice has shown that the application of appropriate technologies for volumetric and surface heat treatments, contributes to obtaining structures with superior physical and mechanical properties [4].…”

Section: Introductionmentioning

confidence: 99%

New Results Regarding the Cavitation Destruction Behavior of Heat-Treated CuSn12-C Bronze with Different Parameters

Salcianu

Ghera

Duma

et al. 2022

AMR

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The present paper analyzes the differences in behavior and resistance to erosion through vibrating cavitation, between the bronze structures CuSn-12C resulting from two volumetric thermal treatments of hardening and tempering. The analysis was performed on the basis of macro and microscopic images, as well as on the basis of the histogram in which the values of the reference parameters used in the laboratory custom and prescribed by the international norms ASTM G32-2016 are compared. This shows the dependence of the degree of erosion as a function of the temperature of tempering heat treatment, after hardening, as a result of microstructural changes and the hardness of the surface attacked by cavitation. The experimental research is performed on the standard vibrating device within the Cavitation Erosion Research Laboratory of the Politehnica University of Timișoara.

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Hydrodynamic transmission operating with two-phase flow

Cited by 3 publications

References 2 publications

Cavitation behavior study of the aging heat treated aluminum alloy 7075

Cavitation behavior study of the aging heat treated aluminum alloy 7075

Influence of aging heat treatment at 180 °C on cavitation erosion for aluminum alloy type 5083 in cold rolled state

New Results Regarding the Cavitation Destruction Behavior of Heat-Treated CuSn12-C Bronze with Different Parameters

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