IMPROVING THE EFFICIENCY OF RADIAL-AXIAL ROTORS OF TURBINE STAGES THROUGH THE USE OF COMPLEX LEAN OF TRAILING EDGES

Authors

R. A. Rusanov, The Szewalski Institute of Fluid-Flow Machinery Polish Academy of Sciences (14, Fiszera St., Gdańsk 80-231, Poland), e-mail: rrusanov@imp.gda.pl, ORCID: 0000-0003-2930-2574

A. V. Rusanov, A. Podgorny Institute of Mechanical Engineering Problems of NASU (2/10, Pozharsky St., Kharkiv, 61046, Ukraine), e-mail: rusanov@ipmach.kharkov.ua, ORCID: 0000-0002-9957-8974

P. Lampart, The Szewalski Institute of Fluid-Flow Machinery Polish Academy of Sciences (14, Fiszera St., Gdańsk 80-231, Poland), ORCID: 0000-0003-3786-7428

M. A. Chugay, A. Podgorny Institute of Mechanical Engineering Problems of NASU (2/10, Pozharsky St., Kharkiv, 61046, Ukraine), ORCID:  0000-0002-0696-4527

Abstract

The influence of the blade trailing edge shape on the flow pattern and integral flow characteristics of radial-axial turbine rotors is investigated. Also a modified analytical method of designing spatial blades of radial-axial rotors with compound lean leading and trailing edges is proposed. A radial-axial rotor designed for a turbo-expander unit of a complex gas treatment plant working in a gas condensate field is chosen as the object of investigations. Three types of rotors are considered having the same geometry of meridional contours, but different shapes of blade trailing edges. In the first type of rotor, the blades have radial trailing edges; in the second type of rotor, straight trailing edges with circumferential lean; and in the third type  of rotor, they are designed in the form of an arc leaned in the circumferential direction. It is shown that the application of compound lean trailing edges of low-loaded radial-axial rotor blades allows us to increase the flow efficiency by 3.1% compared with the rotor blades having radial trailing edges.

Keywords: radial-axial turbine, flow path, spatial modeling, spatial flow, numerical modeling, compound lean

References

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Received 20 November 2016

Published 30 December 2016