Wyniki wyszukiwania - BazTech

1

Efficiency optimisation of blade shape in steam and ORC turbines

Lampart P., Witanowski Ł., Klonowicz P.

Mechanics and Mechanical Engineering

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2018

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Vol. 22, nr 2

553--564

EN

This paper is devoted to direct constrained optimisation of blading systems of large power and small power turbines so as to increase their internal efficiency. The optimisation is carried out using hybrid stochastic-deterministic methods such as a combination of a direct search method of Hooke-Jeeves and simulated annealing or a combination of a bat algorithm and simplex method of Nelder-Mead. Among free shape parameters are blade number and stagger angle, stacking blade line parameters and blade section (profile) parameters. One practical example of efficiency optimisation of turbine blading systems is modification of low load profiles PLK-R2 for high pressure (HP) stages of large power steam turbines. Another optimised geometry is that of an ORC radial-axial cogeneration turbine of 50 kWe. Up to 1% efficiency increase can easily be obtained from optimization of HP blade profiles, especially by making the rotor blade more aft-loaded and reducing the intensity of endwall flows. Almost 2% efficiency rise was obtained for the optimized 50 kWe ORC turbine due to flow improvement at the suction side of the blade.

2

Analysis of dynamical properties of a 700 kW turbine rotor designed to operate in an ORC installation

Breńkacz Ł., Żywica G., Bogulicz M.

Diagnostyka

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2016

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Vol. 17, No. 2

17--23

EN

The article presents the results of structural and dynamic analyses carried out for an axial-flow turbine with a capacity of 700 kW. The turbine is specifically designed for operation in an ORC (Organic Rankine Cycle) installation. The turbine rotor was supported by the following hydrodynamic bearings: two radial bearings and one bidirectional axial bearing. During numerical computation, both forces affecting the blade system and the rotor's torsional moments affecting the shaft were taken into account. Static, modal and forced vibration analysis of the turbine rotor was presented. The article also discusses the process of bearing selection and their geometry optimization to keep the rotor vibration level as low as possible. The computations of radial hydrodynamic bearings were carried out for various bearing clearance shapes. Madyn 2000 software and the in-house developed computer programs that are included in the MESWIR system were used during computer modeling.

PL

W artykule przedstawiono wyniki analizy wytrzymałościowej i dynamicznej turbiny osiowej o mocy 700 kW. Turbina zaprojektowana została do pracy w obiegu ORC (Organic Rankine Cycle). Wirnik turbiny łożyskowany był za pomocą dwóch poprzecznych łożysk hydrodynamicznych oraz dwukierunkowego hydrodynamicznego łożyska osiowego. W obliczeniach numerycznych uwzględniono siły działające na układ łopatkowy oraz momenty skrętne działające na wirnik. Przedstawione zostały analiza statyczna, analiza modalna oraz analiza drgań wymuszonych. Zaprezentowany został proces doboru łożysk i optymalizacja ich geometrii pod kątem minimalizacji drgań wirnika. Wykonane zostały obliczenia poprzecznych łożysk hydrodynamicznych dla różnych kształtów szczeliny smarnej. Podczas pracy użyty został program Madyn 2000 oraz programy ze środowiska MESWIR opracowane w IMP PAN w Gdańsku.

3

Designing and updating the flow part of axial and radial-axial turbines through the use of methods of mathematical modeling

Rusanov A.

Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

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2014

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nr 145

103--106

EN

The paper describes an algorithm for the designing of axial and radial-axial type turbines. The algorithm is based on using mathematical models of various levels of difficulty – from 1D to 3D. Geometry description of flow parts is performed using analytical methods of profiling using a limited number of parameter values. 3D turbulent flow model is realized in the program complex IPMFlow, developed based on the earlier codes FlowER and FlowER-U. The examples of developed or modernized turbines for different purposes power machinesare presented. They are an expansion turbine, ORC turbine, cogeneration medium-pressure turbine.

4

Mikrosiłownia hybrydowa – koncepcja, projekt i badania

Antczak Ł., Kryłłowicz W.

Instal

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2013

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nr 10

8--10

PL

W artykule przedstawiono możliwość wykorzystania niskotemperaturowych źródeł ciepła w postaci energii powstałej ze spalania biomasy oraz energii wód geotermalnych. W pracy zamieszczono opis projektu mikrosiłowni i wyniki badań prowadzone na stanowisku doświadczalnym.

EN

The paper presents a possibility of using low temperature heat sources in the form of chemical energy from biomass combustion and geothermal energy. A design of the micro power plant and test results are presented.