Method to improve precision of rotating inertia and friction measurements in turbomachinery applications

Povey, Thomas; Paniagua, Guillermo

doi:10.1016/j.ymssp.2012.01.025

Cited by 10 publications

(7 citation statements)

References 17 publications

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“…At low rotational speeds, a reasonable hypothesis for friction loss is considering it as a linear function of angular velocity [1]. This improvement in the acceleration-deceleration test was carried out by Povey and Paniagua [7], who observed an improvement in the acceleration-deceleration test considering this hypothesis. a linear function to describe friction loss.…”

Section: Introductionmentioning

confidence: 91%

“…Uncertainty in the rotational moment of inertia measurement is directly correlated to its efficiency uncertainty. According to Povey and Paniagua [7], one percent of uncertainty in inertia determination causes one percent of uncertainty in system efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…Genta and Delprete [9] and Schedlinski and Link [10] review the static and dynamic experimental methods in their papers. The dynamic methods are split into oscillatory methods based on pendular movements [11,12] and acceleration methods based on energy conservation [5,7].…”

Section: Introductionmentioning

confidence: 99%

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GUM-S1 to Evaluate Rotational Inertia Uncertainty Obtained by Acceleration–Deceleration Tests

Santana,

Reis,

Morais

et al. 2024

Iran J Sci Technol Trans Civ Eng

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This work has the goal of experimentally determining the rotational moment of inertia of a wind turbine rotor blade and quantifying the uncertainty of this inertia measurement. Rotational inertia is an important parameter for modelling wind turbine power capacity due to its great influence on powertrain performance. There is a directly proportional relationship between the inertia and rotational power machines. Among commonly used experimental methods, the accelerationdeceleration method was conducted for rotational moment of inertia measurement of a commercial HAWT (Horizontal-Axis Wind Turbines) iSTA Breeze® i-500 model. As recommended by GUM Supplement 1, the Monte Carlo method was used to estimate the measurement uncertainty related to wind turbine rotational inertia. Experimental accelerationdeceleration tests were performed using the motion capture software Tracker to collect angular position data by video capturing the rotational motion of a wind turbine attached to a falling mass, which is rolled to the rotor axis. After appropriate data processing, the experimental uncertainty measure was obtained by the Monte Carlo method. A statistical analysis was implemented to validate the measurement model via comparisons with other methods.

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Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

GUM-S1 to Evaluate Rotational Inertia Uncertainty Obtained by Acceleration–Deceleration Tests

Santana,

Reis,

Morais

et al. 2024

Iran J Sci Technol Trans Civ Eng

View full text Add to dashboard Cite

show abstract

“…Other researchers have used rotational systems to experimentally determine the coefficient of friction, among which stand out the pin on disk system [8,9], circular spin plates [10] and roller systems and radially loaded discs [11]. It is also used the measurement of the angular displacement and the torque used in the test for the determination of the variables involved in the friction phenomenon, for different applications [12,13]. The pin on disk equipment are designed to perform adhesive wear tests, their specifications and the procedure for the execution of the tests are listed in the ASTM G99-05 (Standard test method for wear tests with a Pin on Disk machine) which is a standard method for obtaining valid data.…”

Section: Introductionmentioning

confidence: 99%

Determination of the coefficient of dynamic friction between coatings of alumina and metallic materials

Santos

Córdoba-Tuta

Ramirez

et al. 2017

J. Phys.: Conf. Ser.

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Abstract:This project aims to determine the coefficient of dynamic friction between micrometric size coatings of alumina and metallic materials (Steel and aluminium); the methodology used to achieve the proposed objective consisted of 4 phases, in the first one was developed a procedure that allowed, from a Pin on Disk machine built based on the specifications given by the ASTM G99-05 standard (Standard test method for wear tests with a Pin on Disk machine), to determine the coefficient of dynamic friction between two materials in contact; subsequently the methodology was verified through tests between steel-steel and steelaluminium, due to these values are widely reported in the literature; as a third step, deposits of alumina particles of micrometric size were made on a steel substrate through thermal spraying by flame; finally, the tests were carried out between pins of steel of aluminium and alumina coating to determine the coefficients of dynamic friction between these two surfaces. The results of the project allowed to verify that the developed methodology is valid to obtain coefficients of dynamic friction between surfaces in contact since the percentages of error were of 3.5% and 2.1% for steel-steel and aluminium-steel, respectively; additionally, it was found that the coefficient of friction between steel-alumina coatings is 0.36 and aluminium-alumina coating is 0.25.

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“…2.3. In order to halve the rotor acceleration during the "flow-on" phase, an inertia wheel is installed behind the rotor disk to increase the rotating assembly total inertia from 9.7 kgm 2 up to 17.8 kgm 2 [41]. At the test end the rotor starts decelerating because of ventilation losses, and an aero-brake is activated to rapidly decelerate the rotor disk to rest in only 2-3 minutes.…”

Section: Figure 22: Sketch Of the Rotating Annular Turbine Facilitymentioning

confidence: 99%

On the Aerothermal Flow Field in a Transonic HP Turbine Stage with a Multi-Profile LP Stator Vane

Lavagnoli¹

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The quest for higher performances and durability of modern aero-engines requires the understanding of the complex aero-thermal flow experienced in a multi-row environment. In particular, the high and low pressure turbine components have a great impact into the engine overall performance, and improvements in the turbine efficiencies can only be achieved through detailed research on the three-dimensional unsteady aerodynamics and heat transfer. The present thesis presents an experimental study of the aerothermodynamics in one and a half turbine stage, focusing on: the aero-thermal flow in the overtip region of a transonic highly loaded high pressure (HP) rotor, and the aerodynamics and heat transfer of an innovative low pressure (LP) stator with a multi-profile configuration placed downstream of the high pressure turbine, within an s-shaped duct.Advanced instrumentation and measurement techniques were used and developed to perform the experimental investigation in a short-duration turbine test rig where both high spatial and time accuracy is indispensable. The flow field at the rotor shroud was investigated with simultaneous measurements of heat transfer, static pressure and blade tip clearance by using fast response pressure, wall temperature and capacitance probes. Through repeat experiments at the same turbine operating point, the time-averaged and time-resolved adiabatic wall temperature and convective heat transfer coefficient were evaluated.In the frame of new engine architectures, a novel stator for a LP turbine is proposed with a multi-splitter layout that represents a new design solution towards compact, lighter and performing aero-engine turbomachinery. It contains small aero-vanes and large structural aerodynamic airfoils which are used to support the engine shaft and house service devices. The research focuses on the experimental investigation of the global performance, aerodynamics and thermodynamics of this novel HP-LP vane layout. The turbine was tested at three operating regimes depending on the pressure ratio and the rotational speed. Time-averaged and time-resolved surface pressure and heat flux measurements at the mid-section of the multi-splitter stator were used to characterize the steady and unsteady aero-thermal flow field. State-of-art CFD simulations were used to support the analysis and the understanding of the complex phenomena that characterize the flow physics and assess the efficiency of the structural LP vane at design and off-design conditions.The goals of the research were to provide guidelines to design future aeroengines and promote the understanding of the flow physics in transonic turbine multi-row environments through analysis of the experimental data and comparison with the numerical models. The study provides an extensive experimental database to improve and validate turbomachinery CFD simulations. vi ResumenEl incremento de la eficiencia y la fiabilidad de los actuales aeromotores requiere comprender el complejo flujo aero-termodinámico en presencia de varias cascad...

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Method to improve precision of rotating inertia and friction measurements in turbomachinery applications

Cited by 10 publications

References 17 publications

GUM-S1 to Evaluate Rotational Inertia Uncertainty Obtained by Acceleration–Deceleration Tests

GUM-S1 to Evaluate Rotational Inertia Uncertainty Obtained by Acceleration–Deceleration Tests

Determination of the coefficient of dynamic friction between coatings of alumina and metallic materials

On the Aerothermal Flow Field in a Transonic HP Turbine Stage with a Multi-Profile LP Stator Vane

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