Ferramenta computacional para ensaios de rendimento de turbinas Kaplan / Computational tool regarding Kaplan turbine performance tests

The Kaplan turbine is an axial propeller-type turbine that can simultaneously control guide vanes and runner blades, thus allowing its application in a wide range of operations. Here, turbine tip clearance plays a crucial role in turbine design and operation as high tip clearance flow can lead to a change in the flow pattern, resulting in a loss of efficiency and finally the breakdown of hydro turbines. This research investigates tip clearance flow characteristics and undertakes a transient fast Fourier transform (FFT) analysis of a Kaplan turbine. In this study, the computational fluid dynamics method was used to investigate the Kaplan turbine performance with tip clearance gaps at different operating conditions. Numerical performance was verified with experimental results. In particular, a parametric study was carried out including the different geometrical parameters such as tip clearance between stationary and rotating chambers. In addition, an FFT analysis was performed by monitoring dynamic pressure fluctuation on the rotor. Here, increases in tip clearance were shown to occur with decreases in efficiency owing to unsteady flow. With this study’s focus on analyzing the flow of the tip clearance and its effect on turbine performance as well as hydraulic efficiency, it aims to improve the understanding on the flow field in a Kaplan turbine.

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Experimental results from the Bathμ-wave rotor turbine performance tests

Energy Conversion and Management ◽

10.1016/j.enconman.2019.03.079 ◽

2019 ◽

Vol 189 ◽

pp. 33-48

Author(s):

Stefan Tüchler ◽

Colin D. Copeland

Keyword(s):

Experimental Results ◽

Performance Tests ◽

Wave Rotor ◽

Turbine Performance

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Moisture Condensation Effect on Turbine Performance Tests

Volume 2: Turbo Expo 2004 ◽

10.1115/gt2004-53839 ◽

2004 ◽

Author(s):

I. Roumeliotis ◽

K. Mathioudakis

Keyword(s):

Turbine Engines ◽

Performance Tests ◽

Gas Turbine Engines ◽

Performance Parameters ◽

Atmospheric Air ◽

Turbine Performance ◽

Working Medium ◽

Component Test ◽

Moisture Condensation ◽

Condensation Effect

Water is always present in the atmospheric air in the form of vapour, affecting the operation of turbomachinery components in gas turbine engines. Due to water presence in the working medium, condensation may occur, which can influence the thermal performance of the component and alter the measurements taken for calculations. This can lead to erroneous evaluation of component performance parameters during development performance tests. Procedures to detect condensation and if possible to correct the measurements during engine or component test should be used to avoid such situations. A method allowing the prediction of condensation and the correction of the measurements for low speed expansion is presented. The method is implemented in turbine testing measurements where condensation occurs and the results show that condensation may be predicted and its effects corrected.

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Effects of Turbine Blade Tip Clearance on Turbocharger Performance: An Experimental Investigation

Design and Control of Diesel and Natural Gas Engines for Industrial and Rail Transportation Applications ◽

10.1115/icef2003-0703 ◽

2003 ◽

Cited By ~ 1

Author(s):

A. Keshavarz ◽

K. S. Chapman ◽

J. Shultz ◽

D. G. Kuiper

Keyword(s):

Tip Clearance ◽

Performance Tests ◽

Engine Operation ◽

Available Energy ◽

Turbine Performance ◽

Efficiency Condition ◽

Blade Tip ◽

Fuel Costs ◽

Identical Performance ◽

Blade Tip Clearance

Rising fuel costs and increasingly stringent emission standards push engineers to develop more efficient turbo-machinery. Reducing turbocharger turbine tip clearance is one method of improving turbine performance, thereby improving overall engine operation. By using tip seals or abradable seals, reduction of this clearance is possible. Metco 314 NS material was applied to an Elliot-H type turbocharger turbine shroud to reduce the cold clearance from 0.762 mm (0.030 inch) to 0.457mm (0.018 inch). Two separate yet virtually identical performance tests were conducted at speeds of 13,000 rpm, 15,000 rpm, and 17,000 rpm on the turbocharger. The first test established the efficiency condition of the turbocharger with the tip seal installed. The second was to quantify a decrease in efficiency, if present, after the tip seal was removed. Both tests were conducted as identically as possible. The average amount of available energy not utilized with the tip seal removed was 30.26 kW at 13,000 rpm, 51.42 kW at 15,000 rpm and 45.71 kW at 17,000 rpm.

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Design of Hydro Power by Using Turbines Kaplan on The Discharge Channel Paiton 1 and 2

E3S Web of Conferences ◽

10.1051/e3sconf/20184201008 ◽

2018 ◽

Vol 42 ◽

pp. 01008

Author(s):

Alvin K. Sosilo ◽

Harsono Hadi ◽

Totok Soehartanto

Keyword(s):

Discharge Channel ◽

Block Diagram ◽

Mechanical Energy ◽

Mechanical Power ◽

Hydro Power ◽

Kaplan Turbine ◽

Turbine Performance ◽

Power Turbine ◽

Simulation Results ◽

The Relationship

Condenser water from the discharge channel PJB Paiton discharged to the sea has the potential mechanical energy, because the flow rate of 7.6 m3 / s (if both discharge PJB Paiton function) and the discharge channel reaches a height of 4m. This paper will describe the design of hydro power (in the form of a block diagram) by using Kaplan turbine driven by utilizing the wastewater condenser. Kaplan turbine performance represented in the form of the relationship between the incoming water flow and the pitch angle (the angle between the propellers with a hub) to the torque generated. The simulation results indicate that the turbine torque is proportional to the mechanical power turbine. The greater the torque, the greater the mechanical power, and vice versa.

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Experimental Analysis of Cavitation Phenomena on Kaplan Turbine Blades Using Flow Visualization

Journal of Fluids Engineering ◽

10.1115/1.4041985 ◽

2019 ◽

Vol 141 (7) ◽

Author(s):

Andrej Podnar ◽

Matevž Dular ◽

Brane Širok ◽

Marko Hočevar

Keyword(s):

Turbine Blades ◽

Suction Side ◽

Cavitation Inception ◽

Runner Blade ◽

Kaplan Turbine ◽

Turbine Performance ◽

Blade Shape ◽

The Right ◽

Operating Points ◽

Acceptance Tests

In this study, a comparison of two different Kaplan turbine runners with differently shaped turbine blades was performed. The two turbines differed in the selection of the hydrofoil, the main hydrofoil parameters of which had been modified including, the position of maximum thickness and curvature and the inlet edge radius. Both turbines (unmodified and modified hydrofoils) were tested on a rig designed for low pressure model turbine acceptance tests. The effect of blade shape on cavitation inception, development, and intensity was demonstrated using computer aided visualization. Visualization was performed on the suction side of Kaplan runner blade where the shape of the blade determines cavitation inception and development. The modified Kaplan turbine reduced the cavitation phenomena, and as a result, both turbine performance and output increased for the selected operating points. This demonstrates that choosing the right turbine blade shape is key for optimal turbine performance.

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Measuring method with aerothermodynamic brake for shaft power gas turbine performance tests

10.2514/6.2000-2214 ◽

2000 ◽

Author(s):

D. Scheianu ◽

C. Carlanescu ◽

I. Manea ◽

S. Stefan ◽

A. Goleanu

Keyword(s):

Gas Turbine ◽

Measuring Method ◽

Performance Tests ◽

Turbine Performance ◽

Shaft Power

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Experimental Analyses of a Static to Static Flex Seal and a Honeycomb Seal

Volume 5A: Heat Transfer ◽

10.1115/gt2016-57397 ◽

2016 ◽

Author(s):

Thomas Zierer ◽

Cyrille Bricaud ◽

Marcos Escudero-Olano ◽

Joshua McNally ◽

Afzal Pasha Mohammed

Keyword(s):

Engine Performance ◽

Performance Tests ◽

Low Leakage ◽

Turbine Performance ◽

Honeycomb Seal ◽

Higher Temperature ◽

Honeycomb Seals ◽

Secondary Air ◽

Component Interface ◽

Wide Usage

Improvements in turbine performance are increasingly driven by the need to control leakage both in the main gas path as well as in the secondary air flow system. Seals for static to static interfaces have a wide usage in gas turbine for component interface locations and are becoming more important as engines reach higher temperature targets and compressor pressure ratios. Both flex and honeycomb seals have been used for many years during other OEM seal service upgrades. These seals are designed to be capable of sustaining low leakage operation whilst achieving long lifetimes. To determine the sealing capability of honeycomb and flex seals an advanced hydraulically actuated rig was designed and constructed. A series of leakage performance tests were carried out that accurately simulate engine conditions, including pressure and relative axial and radial movements. The results of these tests are compared against previously presented data on standard membrane seals. Compared to the membrane seal, the flex seal has approximately 60% lower equivalent clearance when tested with uneven (triangular) grooves. This reduction was due to the bending of the seal and subsequent closing of the seal gap under pressure. The flex and membrane seal performed similarly well under more nominal conditions. The honeycomb seal achieved a consistently low leakage under all pressure loadings. All three sealing types have their place in the required technology mix which is essential when aiming for maximized engine performance and lifetime.

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