Theoretical and experimental investigations of transient flow in oil-hydraulic small-diameter pipe system

Urbanowicz, Kamil; Stosiak, Michał; Towarnicki, Krzysztof; Bergant, Anton

doi:10.1016/j.engfailanal.2021.105607

Cited by 20 publications

(4 citation statements)

References 48 publications

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“…The most interesting comparison seems to be the one presented in Fig. 3d, which shows the course of the water hammer for a very large value of water hammer number Wh = 0.145 [48]. It shows that the experimental response was accurately simulated by using the numerical model.…”

Section: Comparisons With Experimental Resultsmentioning

confidence: 91%

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Progress in Analytical Modeling of Water Hammer

Urbanowicz

Jing

Bergant

et al. 2023

Journal of Fluids Engineering

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Analytical formulas for laminar water hammer in horizontal pipes were extended and simplified into a compact mathematical form based on dimensionless parameters: dimensionless time, water hammer number, etc. Detailed treatment of turbulent water hammer analytical solutions is beyond the scope of this paper. In the Muto and Takahashi solution, novel Laplace and time domain formulas for flow velocity and wall shear stress were developed. A series of comparative studies of unified analytical solutions with numerical solutions and the results of measurements were carried out. The study shows that models that account for the frequency-dependent nature of hydraulic resistance agree very well with experimental results over a wide range of water hammer numbers Wh, particularly when Wh ≤ 0.1.

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Section: Comparisons With Experimental Resultsmentioning

confidence: 91%

“…The results of numerical and analytical simulations are compared with the results of measurements available in the literature [15,[46][47][48]. Detailed experimental data and relevant dimensionless numbers necessary to perform and replicate the calculations are summarized in Table 2.…”

Section: Comparisons With Experimental Resultsmentioning

confidence: 99%

Progress in Analytical Modeling of Water Hammer

Urbanowicz

Jing

Bergant

et al. 2023

Journal of Fluids Engineering

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“…The development of analytical considerations on the occurrence of water hammer in hydraulic pipes of small diameters (Urbanowicz et al, 2021b) forced the design of a new test stand. The constructed test stand made it possible to test relatively long and short hydraulic pipes, and its limitation was the actuation time of shut-off valves.…”

Section: Water Hammer Effect Test Standmentioning

confidence: 99%

Unsteady Fluid Flow in Pressurised Closed Pipes in Experimental Bench Examples

et al. 2023

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The paper indicates the frequent occurrence of transient states in hydraulic systems. Particular attention was paid to the phenomenon of water hammer – the causes and effects of this phenomenon. A complete analytical description of this phenomenon has not yet been developed. New theoretical models are still being developed and need to be verified experimentally. The paper focuses on presenting the development of experimental stands for the study of water hammer in hydraulic pipes. Subsequent modifications of the experimental stands for the speed of the shut-off valves and their tightness, as well as for the minimisation of the occurrence of the effects of the pulsation of the performance of the pump supplying the line under investigation, are presented. The stand presented as the final one also allows the testing of transients in hydraulic lines for various types of working fluid (oil, emulsion, distilled water).

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“…The aircraft hydraulics are used on aircraft of all sizes to operate most of their equipment such as landing gears, brakes, flaps, thrust reversers, and flight controls. Thus, the hydraulic system performs the function of moving and actuating the critical and the basic components, according to Leśniewski et al (2022) and Urbanowicz et al (2021). In the aircrafts, exist two main hydraulic system types: the basic hydraulic system and power hydraulic system, according to Aeroclass (2021) (Figure 1a).…”

Section: Introduction: Energy Losses and Operation Delay Connected Wi...mentioning

confidence: 99%

Aircraft Hydraulic Drive Energy Losses and Operation Delay Associated With the Pipeline and Fitting Connections

Karpenko

2024

Aviation

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Theoretical research on hydraulic processes occurring in aircraft hydraulic drives is presented in the studies. Installation of angular fitting connections in aircraft pipeline systems influences hydrodynamic processes and fluid flow characteristics analysed in the research. The provided analysis is based on a validated numerical model utilizing Navier–Stokes equations and the k-epsilon turbulence model. Fluid flow inside the aircraft hydraulic drive pipeline system was investigated with flow rates up to 100 l/min. A mesh independence study was conducted for numerical simulation of the fluid flow. The obtained results include fluid pressure drops, energy losses, and operational delays associated with fluid flow vortex formations at 45° and 90° angular fitting connections. Additionally, compared results from standard methods of calculation for angular fitting connections, including the equivalent length and equivalent length same shape methods.

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Theoretical and experimental investigations of transient flow in oil-hydraulic small-diameter pipe system

Cited by 20 publications

References 48 publications

Progress in Analytical Modeling of Water Hammer

Progress in Analytical Modeling of Water Hammer

Unsteady Fluid Flow in Pressurised Closed Pipes in Experimental Bench Examples

Aircraft Hydraulic Drive Energy Losses and Operation Delay Associated With the Pipeline and Fitting Connections

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