Modelling of valve induced water hammer phenomena in a district heating system

Кaliatka, Аlgirdas; Vaišnoras, Mindaugas; Valinčius, Mindaugas

doi:10.1016/j.compfluid.2014.01.035

Cited by 21 publications

(14 citation statements)

References 5 publications

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“…Kobori et al [21] conducted experiments and theoretical discussion on the relationship between the gas content and wave velocity and analyzed the influences of gas content on wave velocity. Peassall et al [24] obtained the theoretical formula of the relationship between gas content and wave velocity and drew a chart.…”

Section: Wave Velocity Of the Water Hammermentioning

confidence: 99%

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A Simulation Calculation Method of a Water Hammer with Multpoint Collapsing

Yang

Wang

et al. 2020

Energies

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The traditional discrete vapor cavity model (DVCM) is widely used in water hammer simulation. Water column separation in pipelines is usually predicted with this model. Nevertheless, the main weaknesses of this model consist of numerical instability and nonconvergence. Regarding the weaknesses of the traditional model, this paper discusses an improved method. The new method uses a new water hammer velocity formula, a new cavity model, and a floating grid method. Through simulations to test the effects of the new model, an experimental platform can be established to realize a water hammer with multipoint collapsing. The numerical simulation was programmed in C++ and the test was carried out with an actual pipeline model built in the laboratory. After certain modelling and calibration, the parameters in the simulation calculation were consistent with the measured parameters in the test. The numerical simulation results were compared with the experimental results. For the hydraulic transient system with multipoint collapsing, the superposition effect of the wave crest of the pseudo-water hammer in the traditional calculation model was obvious. The pressure of the water hammer in the simulation calculation was significantly higher than the actual value and the convergence effect of the water hammer wave was not good. Compared with the results of the traditional model, the simulation results of the new model were closer to the measured values. Therefore, the new model has better numerical solution accuracy, stability, and convergence, which is worth further study and promotion.

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Section: Wave Velocity Of the Water Hammermentioning

confidence: 99%

“…Therefore, the influence of the gas content on the water hammer wave speed cannot be ignored; otherwise, the accuracy of the calculation results is greatly affected [17,20]. The main assumptions of the traditional discrete vapor cavity model (DVCM) are analyzed below to demonstrate its disadvantages [20][21][22]:…”

Section: Introductionmentioning

confidence: 99%

A Simulation Calculation Method of a Water Hammer with Multpoint Collapsing

Yang

Wang

et al. 2020

Energies

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“…Deviation from the safe operating area during pump operation may be the cause of occurrence of continuous self-oscillating of hydrodynamic nature. Particularly off-nominal flows occurring in some sections of pump wet end lead to hydraulic hammers [4,5,9,10].…”

Section: Ways Of Protection Of Pipeline Systems Against Hydraulic Hammermentioning

confidence: 99%

Ways of protection of pipeline systems against hydraulic hammer

Rogalev¹,

Kocherova²,

Komarov³

et al. 2015

ces

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A subject of the present article is the mechanism of hydraulic hammer emergence and main principles of functioning of devices that protect pipeline against its destructive effect. Special attention is paid to reviewing of ability of undissolved air containing in fluids to reduce the power of hydraulic hammer. According to the calculation results the volume concentration of undissolved air necessary for 1068 Andrey Rogalev et al. protection of pipelines against destruction from hydraulic hammer is not higher than 5%. In spite of the fact that this way of protection from hydraulic hammer is not versatile its successful usage for wastewater disposal pipeline is possible and optimal way of pipeline system aeration is represented by air inlet at the suction nozzle of the pump.

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“…Wan and Li [13] analysed the influence of the operational time differences between the pump and the valve on transient pressure, using the method of characteristics. Kaliatka et al [14] simulated a case of water hammer in a water-heating system with RELAP5 software, pointing out that the water hammer is due to the rapid closing of the check valve. Karadžić et al [15] observed the cavitation and the separation of water column induced by the switching process of the valve and studied their effects on water hammer.…”

mentioning

confidence: 99%