Comparison of the disintegration abilities of modulated and continuous water jets

Říha, Zdeněk; Zeleňák, Michal; Kruml, Tomáš; Poloprudský, Jakub

doi:10.1016/j.wear.2021.203891

Cited by 16 publications

(7 citation statements)

References 15 publications

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“…26b). The results of this research are in line with previous studies on concrete processing [40, 41] conducted using PWJ, generated by hydrodynamic method [42,43,44].…”

Section: Experimental Testssupporting

confidence: 90%

Assessment of the effectiveness of high-pressure water jet machining generated using self-excited pulsating heads

Szada-Borzyszkowska,

Kacalak,

Banaszek

et al. 2024

Preprint

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The article provides a analysis of pulsating water jets, utilizing three distinct head models. It research the impact of tool geometry on water velocity and pressure scientifically. The emergence of vortices due to increased flow through additional holes is identified as the primary cause of the observed pulsations. Laboratory tests contributed measured impulses at various pressures, revealing a direct correlation between longer impulses (ranging from 15 mm to 60 mm) and increased erosion potential. Notably, at 35 MPa, longer impulses exhibited a minor decrease in force deviation by 0.068. Additionally, the research indicates that pressure variations affect impulse frequencies: 0.55 ms at 15 MPa and approximately 1 ms at higher pressures, highlighting the dynamic nature of water streams based on applied pressures. The study emphasizes the exploitable aspects of self-excited pulsating heads, meticulously examining their design, parameter variations, and their impact on impulse generation. Such comprehensive research serves as a fundamental for enhancing the efficiency of surface pulsating water jet.

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“…26b). The results of this research are in line with previous studies on concrete processing [40, 41] conducted using PWJ, generated by hydrodynamic method [42,43,44].…”

Section: Experimental Testssupporting

confidence: 90%

Assessment of the effectiveness of high-pressure water jet machining generated using self-excited pulsating heads

Szada-Borzyszkowska,

Kacalak,

Banaszek

et al. 2024

Preprint

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“…This is because squamous debris was found on the workpiece surface. Riha and Medraj [25,26] et al confirmed the existence of fatigue wear in AWJ.…”

Section: Surface Topography and Surface Roughnessmentioning

confidence: 93%

“…The austenite fraction in the surface of the specimens was reduced by 3.6%, 5.3%, and 8.7% for jet pressures of 50 MPa, 60 MPa, and 70 MPa, respectively. Under the repeated impact of the abrasive, some of the austenite in the surface layer of the specimen transformed into martensite and Feng [25] et al deformation-induced martensite phase transformation in the shot peening of 2205 DSS with the shot peening strength of 0.2 mmA. The martensite fraction and the depth of martensite phase transformation increased with increasing jet pressure.…”

Section: Microstructural Determination From Rietveld Refinementmentioning

confidence: 99%

Effect of abrasive water pressure on the surface layer characteristics of duplex stainless steel 2205

Liu

Wang

et al. 2023

Mater. Res. Express

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The martensitic stainless steel shot with a high number of cycles was applied to the abrasive water jet (AWJ) to study the effect of jet pressures on the surface layer characteristics of 2205 duplex stainless steel. The Almen strips (type A) quantitatively evaluate the AWJ intensity at jet pressures of 50 MPa, 60 MPa, and 70 MPa. The surface layer characteristics were comprehensively studied using scanning electron microscopy, laser scanning confocal microscopy, X-ray diffraction, electron backscatter diffraction techniques, and microhardness tester. It was found that with the increase of the jet pressure from 50 MPa to 60 MPa and 70 MPa, the AWJ intensity increased by 5.0% and 22% and the surface roughness for Ra increased by 16% and 37%. Residual compressive stresses existed in both phases to a depth of more than 200 μm. The austenite hardening rate is higher than that of ferrite, and the maximum residual compressive stress in austenite of the surface layer of the AWJ specimen occurred at the subsurface. The maximum residual compressive stress in ferrite occurred at the surface (50 MPa, 60 MPa) and subsurface (70 MPa). The hetero-deformation induced stresses formed during the plastic deformation of the heterostructured material made the austenitic residual compressive stresses in the surface layer slightly higher than those in ferrite. The surface grain refinement depth exceeded 150 μm, and the degree of austenite grain refinement was higher than that of ferrite. The fraction of deformation-induced martensite and the depth of phase transformation increased with the increase of jet pressure. These changes caused the surface hardening of the specimen, and the jet pressure had a significant effect on the depth of the hardened layer and the microhardness at depth greater than 50 μm.

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“…Ding et al [17] quantitatively measured the diffusion trajectory of the jet concentration field based on image analysis technology, Li et al [18] observed the change law of jet head penetration velocity into the water protective layer based on flash X-ray photography, Ye Yan et al [19] used high-speed photography and pulse coaxial holography to diagnose the dynamic image of micro jet head, Liu et al [20] used high-speed photography and postprocessing technology to study the spray characteristics of the nozzle plume at different stages, Lu et al [21] used high-speed photography to capture the evolution process of the drop hammer impact pulsed water jet in the flow field, and A. Matthujak et al [22] used aerial photography and shadow technology to visualize the impact-driven high-speed jet. Zdenek Riha et al [23] used photography technology to compare and analyze the structural characteristics of acoustic-wave-excited pulsed water jets and continuous water jets. Michal Zelenak et al [24] studied the influence of driving water pressure on the flow field structure using ultra-high-speed photography and particle image velocimetry methods [25], and analyzed the velocity fields of pulse jet and continuous jet [26].…”

Section: Introductionmentioning

confidence: 99%

Influence of Hydraulic Parameters on Multi-Stage Pulse Characteristics of Pressurized Pulsed Water Jet

Zhang,

2023

Processes

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The multi-stage pulse competition of pressurized pulsed water jet becomes the initial pulse at the head tip, and hydraulic parameters are the key parameters that affect the characteristics of multiple pulses. Based on the ultra-high-speed imaging system, a pressurized pulsed water jet flow field capture system was constructed, and the effects of initial pressure and driving pressure of the pressurized chamber on the characteristics of multi-stage pulses were studied. The experimental results show that as the initial pressure of the booster chamber increases, the jet changes from a discontinuous state to a continuous state, and the multi-level pulse simultaneously changes from dominant multi-pulse to implicit multi-pulse; as the driving pressure increases, the initial spacing between the first pulse and the second pulse increases, and the peak velocity of the initial pulse gradually increases. At the same time, the location of the peak velocity also shifts away from the nozzle as the driving pressure increases. In addition, the peak velocity of the initial pulse is relatively close to the theoretical velocity of the continuous jet under driving pressure conditions.

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Comparison of the disintegration abilities of modulated and continuous water jets

Cited by 16 publications

References 15 publications

Assessment of the effectiveness of high-pressure water jet machining generated using self-excited pulsating heads

Assessment of the effectiveness of high-pressure water jet machining generated using self-excited pulsating heads

Effect of abrasive water pressure on the surface layer characteristics of duplex stainless steel 2205

Influence of Hydraulic Parameters on Multi-Stage Pulse Characteristics of Pressurized Pulsed Water Jet

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