Validation of the “stage – diffuser” system numerical study and its use for design modernization


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Abstract

The efficiency of a gas turbine largely depends on the aerodynamics and pressure recovery capacity of the diffuser. For reliable numerical simulation of the flow in the diffuser, the model must be validated on the basis of experimental data on the flow structure. An experimental and numerical study of the “stage – diffuser” system was carried out. The results of this investigation are as follows: the area of applicability of the numerical method for assessing the flow in the “stage – diffuser” system was determined; recommendations for preparing a numerical model and transferring boundary conditions from domain to domain were developed; the importance of profiling the last turbine stage to ensure unseparated flow entry into the diffuser is indicated; the influence of the hub length and the geometry of the struts on the losses in the diffuser and its pressure recovery capacity is determined. It is shown that increasing the hub length to certain limits improves the pressure recovery ratio of the diffuser. The smallest thickness of the struts gives the best results; the tangential and axial slope of the struts does not make a significant contribution in the nominal operating mode of the gas turbine.

About the authors

M. G. Cherkasova

JSC Power Machines

Author for correspondence.
Email: Cherkasova_MG@power-m.ru
ORCID iD: 0000-0001-7257-7149

Design Engineer, Turbine Calculation Sector, Turbine Department, Special Design Bureau for Gas Turbine Units

Russian Federation

E. Yu. Semakina

Peter the Great St. Petersburg Polytechnic University

Email: g.semakinalena@gmail.com
ORCID iD: 0000-0001-8591-4028

Candidate of Science (Engineering), Associate Professor, Department of Turbines, Hydraulic Units and Aircraft Engines

Russian Federation

V. A. Chernikov

Peter the Great St. Petersburg Polytechnic University

Email: viktor.chernikov@gmail.com
ORCID iD: 0000-0003-4289-1422

Doctor of Science (Engineering), Professor, Department of Turbines, Hydraulic Units and Aircraft Engines

Russian Federation

References

  1. Zander M.S., Semakina E.J., Chernikov V.A. Experimental and numerical research of 3d-flow structure in the block «turbine stage - axial diffuser. Nauchno-Tekhnicheskie Ve-domosti SPbGPU. 2013. No. 1 (166). P. 197-203. (In Russ.)
  2. Semakina E., Chernikov V., Kirichenko R., Cherkasova M. Results of the experi-mental and numerical investigations of the aerodynamic characteristics of the GTE-65 «stage-diffuser» system. Sb. dokladov LXVII nauchno-tekhnicheskoy sessii po problemam gazovykh turbin i parogazovykh ustanovok «Nauchno-Tekhnicheskie Problemy Parogazovykh Ustanovok v Elektroenergetike RF» (September, 15-16, 2020, Saint Petersburg). Saint Petersburg, 2020. P. 81-90. (In Russ.)

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