Flow Characteristics of Curved Ducts

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F07%3APU71164" target="_blank" >RIV/00216305:26210/07:PU71164 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Flow Characteristics of Curved Ducts

Original language description

Curved channels are very often present in real hydraulic systems, e.g. curved diffusers of hydraulic turbines, S-shaped bulb turbines, fittings, etc. Curvature brings change of velocity profile, generation of vortices and production of hydraulic losses.Flow simulation using CFD techniques were performed to understand these phenomena. Cases ranging from single elbow to coupled elbows in shapes of U, S and right angle position were modeled for circular cross-section and Re = 30000 (based on pipe diameterand bulk velocity). Spatial development of the flow was studied and consequently it was deduced that minor losses are connected with the transformation of pressure energy into kinetic energy and vice versa. This transformation is a dissipative process and is reflected in the amount of the energy irreversibly lost. Least loss coefficient is connected with flow in U-shape elbows, biggest one with flow in S-shape elbows. Development of channel vortices was also investigated and different v

Czech name

Charakteristika proudění v zakřivených kanálech

Czech description

V inženýrské praxi se často vyskytuje proudění v zakřivených kanálech (sací trouby vodních turbín, hydraulické armatury, atd.). Zakřivení způsobuje změnu rychlostního profilu, vznik vírů a hydraulické ztráty. V článku je sledováno proudění v soustavě kolen (U, S, prostorové natočení s pravým úhlem) pro Reynoldsovo číslo 60000. Je dokumentována spojitost mezi transformací tlakové energie v kinetickou a zpět a tím vyvolanými hydraulickými ztrátami. Výsledky jsou porovnány s experimentem.

Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BK - Liquid mechanics

OECD FORD branch

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Project

<a href="/en/project/GP101%2F06%2FP190" target="_blank" >GP101/06/P190: Shape Optimization of the Diffuser with Inlet Circumferential Velocity Component</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2007

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Applied andComputational Mechanics

ISSN

1802-680X

e-ISSN

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Volume of the periodical

1

Issue of the periodical within the volume

1

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

10

Pages from-to

255-264

UT code for WoS article

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EID of the result in the Scopus database

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