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First name, Middle name, Last name, Scientific degree, Scientific rank, Current position. Full and brief name of the organization, The organization address.Кozyreva T.S. – candidate of technical sciences, associate professor E-mail: kozyrevats@ Ermilova E.U. – post-graduate student E-mail: lizabeta_91@ Kazan State University of Architecture and Engineering The organization address: 420043, Russia, Kazan, Zelenaya st., 1 Маtz E.B. – candidate of technical sciences, associate professor E-mail: meb10@ Kazan National Research Technical University named after A.N. Tupolev The organization address: 420111, Russia, Kazan, К. Marks st., 10
Title of the articleManagement of non-stationary processes in hydraulic system triggering shut-off devices
Abstract.Modern hydraulic system is characterized by a rather high level of technical equipment, introduction of tools and systems of management and control over technological processes. Actuation of high-speed devices such systems leads to non-stationary processes and, consequently, to the increase of amplitude of fluctuations of the hydrodynamic parameters that affect the technological process. Therefore, many factors leading to this phenomenon should be taken into account at the design stage. Increase of the amplitude of oscillations caused by operation of the shutoff devices (SD) installed on pipelines, typical for hydrotransport systems for various purposes. The emergence of an emergency (for example, depressurization) requires quick flow shutoff on the site or the entire pipeline. The response time of the SD directly connected with the loss of product due to leakage and therefore should be minimal. Decreasing the time will increase the amplitude of pressure fluctuation in the pipeline and to the danger of destruction. For calculation of nonstationary processes triggering shutoff devices applies a method of characteristics with a regular rectangular grid. The calculation model allows to determine the amplitude of fluctuations of the hydrodynamic characteristics at various laws of changing controlling rating curve taking into account the viscosity and the availability of liquid undissolved gases. The relationship defining approximately maximal fluctuation amplitude of pressure from the volumetric gas content in the liquid phase are dimensionless criterial form, which allows us to generalize the results obtained in many combination of parameters of hydraulic and shutoff device.
Keywords.Shut-off device, fluctuation amplitude of pressure, controlling rating curve, liquid-gas mixture.
For citations:Кozyreva T.S., Ermilova E.U., Маtz E.B. Management of non-stationary processes in hydraulic system triggering shut-off devices // Izvestiya KGASU. 2014. №1(27) P.188-194.

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