Investigation Into the Hydrodynamic Processes of Fitting Connections for Determining Pressure Losses of Transport Hydraulic Drive

Karpenko, Mykola; Bogdevičius, Marijonas

doi:10.3846/transport.2020.12335

Cited by 25 publications

(11 citation statements)

References 18 publications

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“…Therefore, improving the efficiency of the axial flow pump and other flow passage components of the system has strong practical significance for energy conservation and emission reduction [3]. The improvement of the axial flow pump performance, however, must depend on the perfection and enrichment of the axial flow pump design theory.…”

Section: Introductionmentioning

confidence: 99%

Study on Inlet Flow Field Structure and End-Wall Effect of Axial Flow Pump Impeller under Design Condition

et al. 2022

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The existing experimental technology cannot accurately and quantitatively measure the flow field structure and the wall boundary layer displacement effect in the axial flow pump. Based on SST k-ω turbulence model, a three-dimensional unsteady numerical simulation of the whole flow field of an axial flow pump was presented at the designed operating point to overcome the weakness of traditional measurement methods in measuring the flow field of the axial flow pump. The flow field structure of the axial flow pump inlet was studied quantitatively and the result was compared with the theoretical design value. It was found that there is an obvious impeller rotation effect and end-wall effect in the flow field of the axial flow pump inlet. The distribution law of the impeller inlet flow field and the crowding coefficient caused by the wall boundary layer were obtained. The pump inlet measurement point in the experiment and calculation domain inlet in the simulation should be kept at a distance of more than 0.5 Ds away from the impeller inlet to eliminate the influence of the impeller rotation effect. Through contrastive analysis, it was found that there is an obvious difference between the calculated value and the design value of the flow field structure due to the end-wall effect. The crowding coefficient should be taken into account when designing an axial flow pump. This study has certain reference significance for further understanding the flow field structure at the inlet of the axial flow pump impeller and improving the design theory of the axial flow pump.

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Section: Introductionmentioning

confidence: 99%

Study on Inlet Flow Field Structure and End-Wall Effect of Axial Flow Pump Impeller under Design Condition

et al. 2022

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“…In current research, for comparing analysis and investigation a root cause analysis of the failure of hydraulic flexible high-pressure hoses, replaced by compact version during a maintenance a two layers braided high-pressure hose under investigation. The two layers braided highpressure hose with inner diameters 1/2" is one of the most frequently used type of high-pressure hose in the hydraulic drives, according to Karpenko and Bogdevičius (2020). The standard two metal braid reinforced hydraulic hose (2SN) is accepted for investigation according to iTeh standards (2015a).…”

Section: Research Objectsmentioning

confidence: 99%

Landing Gear Failures Connected With High-Pressure Hoses and Analysis of Trends in Aircraft Technical Problems

Karpenko

2022

Aviation

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Reliability and maintenance analysis in aviation industry focused on a main objective of the accident and incident investigations what are help to better understand the causes of accidents. In the article suggested the underlying concept by scorecard of situations what lead to aviation accidents. In the present research, the aviation accident connected with a landing gear and a problem of failure to follow maintenance instructions during a maintenance on aircraft landing gear hydraulic drive was under an investigation, on an example of root cause analysis of the failure of hydraulic flexible highpressure hoses. The approach presented in this research of experimental measurements, based on fluid pressure measuring, high-pressure hoses vibration measuring and frequency’s analysis. By spectrum analyses was found that high-pressure hoses are most susceptible to deformation at frequencies to the response of the fluid within, as well as at hoses material resonance frequencies. The compact version of hoses is more deformational on the resonance points than a standard version of hose. In final according to analyses, was established that disrespect of the frequency conditions was leaded to causes irreversible degradation changes of the hose inner structure and occurrence of material defects inside layers contact what lead in final step to hose failure.

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“…For the marine engineering industry, the pipeline system plays the role of connecting various key equipment, which is directly related to the functional integrity of the delivered products. However, in the actual use of equipment, abnormal vibrations often occur due to the interaction between the internal fuid of the pipeline and the external wall [4][5][6]. Especially for high-value-added passenger ships represented by luxury passenger ships, due to the complexity of their system functions, the layout density of pipelines is much higher than that of conventional marine products, the load situation is more complex, and abnormal vibrations are more likely to occur.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Fluid-Structure Coupling Vibration Characteristics of Pipeline Transporting Bubbly Fluid Medium: With Application to Luxury Passenger Ship Life Area Pipeline

Chen

Zhou

Zhang

2023

Shock and Vibration

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When pipelines are transporting bubbly fluid medium, due to the coalescence and breakage behaviours of the bubbles, the pressure distribution at the wall is not uniform and the structure response is more complex. The bubbly beverage pipeline in the life area of the luxury passenger ship is a typical scene of the pipeline transporting bubbly fluid medium. In this paper, the two-way fluid-structure coupling analysis is carried out on such a scene with the aid of ANSYS software and the PBM model is introduced to characterize the dynamic properties of bubbles. At the same time, the accuracy of this calculation method is verified by the scaling experiment. On this basis, the response of the pipeline under the excitation of bubbly fluid is calculated for different inlet velocities and gas volume fractions, and the effectiveness of common vibration damping measures is evaluated. The result shows that the addition of bubbles to the fluid medium has a significant effect on the distribution of the flow field in the pipeline during transport, and the vibration acceleration values of the pipe wall also increase significantly. This method enables accurate simulation of the vibration characteristics of bubbly fluid medium pipelines.

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Investigation Into the Hydrodynamic Processes of Fitting Connections for Determining Pressure Losses of Transport Hydraulic Drive

Cited by 25 publications

References 18 publications

Study on Inlet Flow Field Structure and End-Wall Effect of Axial Flow Pump Impeller under Design Condition

Study on Inlet Flow Field Structure and End-Wall Effect of Axial Flow Pump Impeller under Design Condition

Landing Gear Failures Connected With High-Pressure Hoses and Analysis of Trends in Aircraft Technical Problems

Analysis of Fluid-Structure Coupling Vibration Characteristics of Pipeline Transporting Bubbly Fluid Medium: With Application to Luxury Passenger Ship Life Area Pipeline

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