The influence of the last stage blades swirl to the efficiency of «stage-diffuser» unit of stationary GTU

THE PURPOSE. Determination of the optimal law of swirling of the blades of the last stage of a stationary GTU. Due to the specificity of its operating conditions - in a system with a diffuser - the traditional laws of swirling lead to a non-optimal flow in the diffuser and, consequently, reduce the...

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Main Authors: L O. Vokin, E Yu Semakina, V. A. Chernikov
Format: Article
Language:English
Published: Kazan State Power Engineering University 2021-10-01
Series:Известия высших учебных заведений: Проблемы энергетики
Subjects:
Online Access:https://www.energyret.ru/jour/article/view/1887
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author L O. Vokin
E Yu Semakina
V. A. Chernikov
author_facet L O. Vokin
E Yu Semakina
V. A. Chernikov
author_sort L O. Vokin
collection DOAJ
description THE PURPOSE. Determination of the optimal law of swirling of the blades of the last stage of a stationary GTU. Due to the specificity of its operating conditions - in a system with a diffuser - the traditional laws of swirling lead to a non-optimal flow in the diffuser and, consequently, reduce the efficiency of the entire unit and the power plant as a whole. In this paper, we used numerical and experimental methods for studying a three-dimensional flow. Two stages with different laws of swirling were investigated - with the traditional law of constancy of the angle of flow out of the guide vanes along the radius, and with reverse swirling. The same diffuser was used in both cases. METHODS. Experimental studies were carried out using pneumometric five-channel probes of an original design on an ET-4 aerodynamic stand in the Turbomachinery laboratory of SPbPU. Numerical studies were carried out in the CFX gas dynamic calculation package; the parameters in the corresponding sections, obtained during the physical experiment, were used as boundary conditions.RESULTS. Integral characteristics of the stage, the vector of flow velocities in various sections were obtained. The experiment was compared with the numerical calculation and showed satisfactory convergence of the results. CONCLUSION. The optimal swirling law for the last stage operating in a system with a diffuser is forced vortex flow.
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spelling doaj.art-30d5d665d5604e11ba9e05c57dc2ce092023-09-03T06:54:06ZengKazan State Power Engineering UniversityИзвестия высших учебных заведений: Проблемы энергетики1998-99032021-10-01234849510.30724/1998-9903-2021-23-4-84-95779The influence of the last stage blades swirl to the efficiency of «stage-diffuser» unit of stationary GTUL O. Vokin0E Yu Semakina1V. A. Chernikov2Peter the Great St. Petersburg Polytechnic UniversityPeter the Great St. Petersburg Polytechnic UniversityPeter the Great St. Petersburg Polytechnic UniversityTHE PURPOSE. Determination of the optimal law of swirling of the blades of the last stage of a stationary GTU. Due to the specificity of its operating conditions - in a system with a diffuser - the traditional laws of swirling lead to a non-optimal flow in the diffuser and, consequently, reduce the efficiency of the entire unit and the power plant as a whole. In this paper, we used numerical and experimental methods for studying a three-dimensional flow. Two stages with different laws of swirling were investigated - with the traditional law of constancy of the angle of flow out of the guide vanes along the radius, and with reverse swirling. The same diffuser was used in both cases. METHODS. Experimental studies were carried out using pneumometric five-channel probes of an original design on an ET-4 aerodynamic stand in the Turbomachinery laboratory of SPbPU. Numerical studies were carried out in the CFX gas dynamic calculation package; the parameters in the corresponding sections, obtained during the physical experiment, were used as boundary conditions.RESULTS. Integral characteristics of the stage, the vector of flow velocities in various sections were obtained. The experiment was compared with the numerical calculation and showed satisfactory convergence of the results. CONCLUSION. The optimal swirling law for the last stage operating in a system with a diffuser is forced vortex flow.https://www.energyret.ru/jour/article/view/1887swirl lawnumerical modelingphysical experimentaerodynamic probeturbinediffuserefficiency
spellingShingle L O. Vokin
E Yu Semakina
V. A. Chernikov
The influence of the last stage blades swirl to the efficiency of «stage-diffuser» unit of stationary GTU
Известия высших учебных заведений: Проблемы энергетики
swirl law
numerical modeling
physical experiment
aerodynamic probe
turbine
diffuser
efficiency
title The influence of the last stage blades swirl to the efficiency of «stage-diffuser» unit of stationary GTU
title_full The influence of the last stage blades swirl to the efficiency of «stage-diffuser» unit of stationary GTU
title_fullStr The influence of the last stage blades swirl to the efficiency of «stage-diffuser» unit of stationary GTU
title_full_unstemmed The influence of the last stage blades swirl to the efficiency of «stage-diffuser» unit of stationary GTU
title_short The influence of the last stage blades swirl to the efficiency of «stage-diffuser» unit of stationary GTU
title_sort influence of the last stage blades swirl to the efficiency of stage diffuser unit of stationary gtu
topic swirl law
numerical modeling
physical experiment
aerodynamic probe
turbine
diffuser
efficiency
url https://www.energyret.ru/jour/article/view/1887
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