Influences on water-hammer wave shape: an experimental study

Traudt, Tobias; Bombardieri, Cristiano; Manfletti, Chiara

doi:10.1007/s12567-016-0115-7

Cited by 5 publications

(6 citation statements)

References 13 publications

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“…The experimental results [42] indicate some double peaks, which are not predicted by any of the friction models. This is believed to be caused by harmonics of the experimental setup.…”

Section: Single Phasementioning

confidence: 73%

“…The experimental study conducted by Traudt et al [42] consist of a 7.7 m stainless steel pipe (grade 1.4541) with a diameter of 19 mm and a wall thickness of 1.5 mm. Young's modulus is set to 200 GPa, the pipe roughness to ε = 2 × 10 −6 m, and Poisson's ratio to ν = 0.28.…”

Section: Methodsmentioning

confidence: 99%

“…This is believed to be caused by harmonics of the experimental setup. As such Traudt et al [42] report that the second harmonic frequency of the experimental setup of 132 Hz is interfering with the frequency of the water hammer which is 43 Hz. Since none of the models accurately describe the experimental data, a sensitivity analysis on the parameters, Young's modulus, Poisson's ratio and the temperature of the water were conducted to see, whether this could explain the difference.…”

Section: Single Phasementioning

confidence: 99%

“…From Table 2, it can be seen that the CB based models gives the best prediction of the experimental results. Comparison of the experimental data (experiment 1 [42]) with the simulated results for each friction model. Note that the steady and quasi-steady friction models gave similar results and all the Convolution Based models (CB) friction models also gave similar results.…”

Section: Single Phasementioning

confidence: 99%

“…Comparison of model and experimental results for experiment 1 conducted by[42]. The calculations were conducted on a laptop with an Intel…”

mentioning

confidence: 99%

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Implementation and Validation of a Free Open Source 1D Water Hammer Code

Jensen

Larsen

Lassen

et al. 2018

Fluids

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This paper presents a free code for calculating 1D hydraulic transients in liquid-filled piping. The transient of focus is the Water Hammer phenomenon which may arise due to e.g., sudden valve closure, pump start/stop etc. The method of solution of the system of partial differential equations given by the continuity and momentum balance is the Method of Characteristics (MOC). Various friction models ranging from steady-state and quasi steady-state to unsteady friction models including Convolution Based models (CB) as well as an Instantaneous Acceleration Based (IAB) model are implemented. Furthermore, two different models for modelling cavitation/column separation are implemented. Column separation may occur during low pressure pulses if the pressure decreases below the vapour pressure of the fluid. The code implementing the various models are compared to experiments from the literature. All experiments consist of an upstream reservoir, a straight pipe and a downstream valve.

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“…The experimental results [42] indicate some double peaks, which are not predicted by any of the friction models. This is believed to be caused by harmonics of the experimental setup.…”

Section: Single Phasementioning

confidence: 73%

Section: Methodsmentioning

confidence: 99%

Section: Single Phasementioning

confidence: 99%

Section: Single Phasementioning

confidence: 99%

“…Comparison of model and experimental results for experiment 1 conducted by[42]. The calculations were conducted on a laptop with an Intel…”

mentioning

confidence: 99%

See 3 more Smart Citations

Implementation and Validation of a Free Open Source 1D Water Hammer Code

Jensen

Larsen

Lassen

et al. 2018

Fluids

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Comparison of water and cryogenic fluid hammer experiments for rocket engine feed line systems

2023

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Fluid hammer occurs when a flow in a pipeline is rapidly stopped due to valve closure or shutting down a pump. The resulting pressure wave can reach very high amplitudes, depending on the fluid properties and the flow velocity. In spacecrafts and launchers, where the reduction of weight is always an important design goal, it is not possible to build the structure arbitrarily robust. Understanding the transient behaviour of the fluids is necessary to predict mechanical loads on the structure and align the design to them. Since a lot of launchers use reactive, cryogenic propellants, it is a common approach to use inert substitute fluids for on ground testing like water (H2O) or liquid nitrogen (LN2). LN2 comes with the advantage of being cryogenic like real propellants, but ground testing is consequently more complex than with H2O. For this purpose, several fluid hammer experiments with both fluids were performed and compared to each other to provide a foundation for deciding which substitute fluid would be useful. Graphical abstract

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