THE EXPERIMENTAL STUDY OF DIFFUSER GEOMETRY FOR LOW PRESSURE
Result description
The performance of the last stage of the LP part of a steam turbine is strongly influenced by the effectivity of the downstream exhaust casing. The 90° turning of the flow in a relatively short axial distance is a major cause of losses and the design of low-loss diffuser still remains a challenge for mechanical engineers. In this paper, results of studies on a several steam turbine exhaust diffuser designs of SKODA have been reported. Several experimental measurements were carried out in the special sector model air test rig. This unique test rig allows visual observation of the flow by the Schlieren method and evaluating the loss coefficient of static pressure in the diffuser. The test rig allows achieving very high (supersonic) speeds. The range of observed velocities was from 30 to 360 m/s. The experimental data from these measurements are very useful to be able to predict the exhaust casing losses during the real operation of steam turbine in non-designed states. The behaviour of individual diffuser designs has been discussed.
Keywords
The result's identifiers
Result code in IS VaVaI
Result on the web
https://acc-ern.tul.cz/images/journal/sbornik/ACC_JOURNAL_2019_A.pdf#page=17
DOI - Digital Object Identifier
Alternative languages
Result language
angličtina
Original language name
THE EXPERIMENTAL STUDY OF DIFFUSER GEOMETRY FOR LOW PRESSURE
Original language description
The performance of the last stage of the LP part of a steam turbine is strongly influenced by the effectivity of the downstream exhaust casing. The 90° turning of the flow in a relatively short axial distance is a major cause of losses and the design of low-loss diffuser still remains a challenge for mechanical engineers. In this paper, results of studies on a several steam turbine exhaust diffuser designs of SKODA have been reported. Several experimental measurements were carried out in the special sector model air test rig. This unique test rig allows visual observation of the flow by the Schlieren method and evaluating the loss coefficient of static pressure in the diffuser. The test rig allows achieving very high (supersonic) speeds. The range of observed velocities was from 30 to 360 m/s. The experimental data from these measurements are very useful to be able to predict the exhaust casing losses during the real operation of steam turbine in non-designed states. The behaviour of individual diffuser designs has been discussed.
Czech name
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Czech description
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Classification
Type
Jost - Miscellaneous article in a specialist periodical
CEP classification
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OECD FORD branch
20302 - Applied mechanics
Result continuities
Project
TJ01000048: Decreasing of Exhaust Loss in Modern Design Steam Turbines
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2018
Confidentiality
C - Předmět řešení projektu podléhá obchodnímu tajemství (§ 504 Občanského zákoníku), ale název projektu, cíle projektu a u ukončeného nebo zastaveného projektu zhodnocení výsledku řešení projektu (údaje P03, P04, P15, P19, P29, PN8) dodané do CEP, jsou upraveny tak, aby byly zveřejnitelné.
Data specific for result type
Name of the periodical
ACC JOURNAL XXV 1/2019
ISSN
2571-0613
e-ISSN
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Volume of the periodical
XXV
Issue of the periodical within the volume
Volume 25, Issue 1
Country of publishing house
CZ - CZECH REPUBLIC
Number of pages
27
Pages from-to
17
UT code for WoS article
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EID of the result in the Scopus database
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Basic information
Result type
Jost - Miscellaneous article in a specialist periodical
OECD FORD
Applied mechanics
Year of implementation
2018