Revalorisation of the Szewalski’s concept of the law of varying the last-stage blade retraction in a gas-steam turbine

Tomasz Kowalczyk,Janusz Badur,Paweł Ziółkowski,Stanisław Głuch,M. Rerak,M. Majdak

doi:10.1051/e3sconf/202132300034

Abstract

The article presents the implementations of the free vortex law to the blade of the last stage of a gas-steam turbine. First, a thermodynamic analysis was carried out, determining the parameters at the inlet, then the number of stages of the high and low-pressure part of the turbine was constructed, together with the kinematics and velocity vectors for subsequent stages of the axial turbine. The last step of article was to take into account the law of variation of the peripheral component of the velocity of the medium working with the radius of the turbine in a discrete way and to make a 3D drawing of the resulting geometry. When creating the spatial model, the atlas of profiles of reaction turbine stages was used.

Highlights

The issue of shaping the turbine blades has appeared in literature since the beginning of the last century [1], there are new concepts appeared over the years [2,3]
The paper presents the results of thermodynamic analysis, which gives the basis for a full flow analysis in the stages of the reaction turbine
In the case of revalorization of Szewalski's concept, the law of free vortex winding should be extended to include a new method of determining the blade profile

Summary

Introduction

The issue of shaping the turbine blades has appeared in literature since the beginning of the last century [1], there are new concepts appeared over the years [2,3]. This paper is purely theoretical analyses of turbine with a steam-gas working fluid produced in a wet combustion chamber. The concept of this cycle was developed in the dissertation of P. The paper presents the results of thermodynamic analysis, which gives the basis for a full flow analysis in the stages of the reaction turbine. The aim of the work was to adapt the law of curling based on a free vortex to a gas-steam turbine. Szewalski's concept of the law of differential folding was mentioned

Thermodynamic parameters and kinematics of the gas-steam turbine

Model of a vane coiling on the height of the radius

Conclusion