Temat: flow characteristics - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Resonant characteristics of ﬂow pulsation in pipes due to swept sine constraint
Autorzy:: Pałczyński, T.
Powiązania:: https://bibliotekanauki.pl/articles/175294.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: pulsating ﬂow in pipes
sweep sine excitation
amplitude frequency characteristics
Opis:: A fast and easy to use method for analysing the amplitude frequency characteristics of pulsating ﬂow in pipes with a sine sweep input function is presented. The key element is the sweeping excitation of the pulse generator frequency which generates fast whole-spectrum resonance (from 20 Hz to 160 Hz). A case study describes tests conducted into the applicability of the method for research into pulsating ﬂows. First, the test rig is brieﬂy described, along with the main assumptions of the research. Next, theamplitude frequency resonance dueto swept oscillations is estimated for increasing, decreasing and changeable input mass ﬂow rates. These characteristics are approximated based on a second-order transfer function. Following such assumptions, the damping coeﬃcients and resonance frequencies are estimated. The inﬂuence of the direction of the frequency sweep method (increasing or decreasing) on the resultant resonance frequency is also investigated.
Źródło:: Transactions of the Institute of Fluid-Flow Machinery; 2016, 133; 131-144
0079-3205
Pojawia się w:: Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Mathematical model and numerical computations of transient pipe flows with fluid-structure interaction
Autorzy:: Henclik, S.
Powiązania:: https://bibliotekanauki.pl/articles/175378.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: waterhammer
transient pipe flow
fluid-structure interaction (FSI)
numerical modeling
method of characteristics
Opis:: Transient flows in closed conduits are of interest from over a century, but the dynamic interaction between the fluid and the pipe is taken into consideration more thoroughly just from a few decades. A standard model of the phenomenon consists of fourteen first order partial differential equations (PDE), two for a one-dimensional (1D) liquid flow and twelve for 3D pipe motion. In many practical cases however, a simpler four equations (4E) model can be used, where 1D longitudinal pipe movement is assumed. A short description of waterhammer event with fluidstructure interaction taken into account is presented in the article. The 4E mathematical model is presented in detail with the assumptions and main algorithms of computer program that has been developed. Two phase flow is assumed not to take place, but the friction between the liquid and the pipe wall are taken into consideration. A method of characteristics (MOC) with time marching procedure is employed for finding the solutions, but instead of direct solving the resulting finite difference equations (FDE) the “wave method” is proposed. Some other important elements of the algorithm are presented and selected results of numerical computations as well.
Źródło:: Transactions of the Institute of Fluid-Flow Machinery; 2010, 122; 77-94
0079-3205
Pojawia się w:: Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:: Biblioteka Nauki

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