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FREE TURBINE [8 records]

Record 1 2018-10-04

English

Subject field(s)
  • Aeronautical Engineering and Maintenance
CONT

The risk of compressor blade failure in turbine powered helicopters, such as what occurred in this incident, will be reduced by taking whatever design, maintenance and operational precautions are necessary to ensure that the airflow through the engine is free of all possible solid contamination in all conditions.

French

Domaine(s)
  • Aérotechnique et maintenance
CONT

Le risque de panne attribuable à la défaillance des aubes de compresseur des hélicoptères à turbine, comme celle survenue dans l’incident en cause, sera réduit si l’on prend les précautions nécessaires au niveau de la conception, de la maintenance et des opérations pour faire en sorte que l’air qui pénètre dans l’entrée d’air du moteur est exempt le plus possible de tous contaminants solides, et ce, dans toutes les conditions d’exploitation.

CONT

La commission d’enquête équatorienne a déterminé que la cause probable de l’accident résultait d’une défaillance des aubes de compresseur turbine en raison de fluage.

Spanish

Save record 1

Record 2 2016-01-29

English

Subject field(s)
  • Aircraft Propulsion Systems
  • Helicopters (Military)
  • Ship's Aircraft (Military)
DEF

A turboshaft engine with no physical connection between the compressor and power output shaft.

OBS

free power turbine : term officially approved by the Aeronautical Terminology Standardization Committee(ATSC)-Helicopters.

French

Domaine(s)
  • Propulsion des aéronefs
  • Hélicoptères (Militaire)
  • Aéronefs embarqués (Militaire)
OBS

turbine libre : terme uniformisé par le Comité d'uniformisation de la terminologie aéronautique (CUTA) - Hélicoptères.

OBS

turbine libre : terme uniformisé par le Comité d'uniformisation de la terminologie aéronautique (CUTA) - Opérations aériennes.

OBS

turbine libre : terme uniformisé par le Comité de normalisation de la terminologie navale.

Spanish

Save record 2

Record 3 2013-01-29

English

Subject field(s)
  • Aerodynamics and Theory of Gases
  • Wind Energy
DEF

A vortex wake model used to assess the performance of horizontal axis wind turbines by partitioning the flow field downstream of the rotor into three regions.

CONT

Success of vortex theories in the performance analysis of horizontal axis wind turbines depends greatly upon accurate specification of the geometry of the vortex wake... An earlier wake model of helicopter rotors is extended for wind turbine applications, the fast free wake method(FFW). The FFW was accomplished by partitioning the flow field downstream of the rotor into three regions :(1) the near wake, modeled as a series of straight vortex lines;(2) the intermediate wake, modeled as a number of vortex rings; and(3) the far wake, taken to be a semi-infinite cylindrical wake.

French

Domaine(s)
  • Théorie des gaz et aérodynamique
  • Énergie éolienne
DEF

Modèle utilisé pour déterminer le sillage tourbillonnaire des éoliennes à axe horizontal par la séparation en trois dimensions du champ d'écoulement en aval du rotor.

Spanish

Campo(s) temático(s)
  • Aerodinámica y teoría de los gases
  • Energía eólica
Save record 3

Record 4 2007-04-26

English

Subject field(s)
  • Aerodynamics and Theory of Gases
  • Wind Energy
DEF

In vortex theories, one of the three regions partitioning the flow field downstream of the rotor, modeled as a number of vortex rings.

CONT

Success of vortex theories in the performance analysis of horizontal axis wind turbines depends greatly upon accurate specification of the geometry of the vortex wake... An earlier wake model of helicopter rotors is extended for wind turbine applications, the fast free wake method(FFW). The FFW was accomplished by partitioning the flow field downstream of the rotor into three regions :(1) the near wake, modeled as a series of straight vortex lines;(2) the intermediate wake, modeled as a number of vortex rings; and(3) the far wake, taken to be a semi-infinite cylindrical wake.

French

Domaine(s)
  • Théorie des gaz et aérodynamique
  • Énergie éolienne
DEF

Dans la théorie des tourbillons, une des trois dimensions séparant le champ d'écoulement en aval du rotor, modélisée sous forme d'un certain nombre d'anneaux tourbillonnaires.

Spanish

Save record 4

Record 5 2007-04-26

English

Subject field(s)
  • Aerodynamics and Theory of Gases
  • Wind Energy
DEF

In vortex theories, one of the three regions partitioning the flow field downstream of the rotor, modeled as a semi-infinite cylindrical wake.

CONT

Success of vortex theories in the performance analysis of horizontal axis wind turbines depends greatly upon accurate specification of the geometry of the vortex wake... An earlier wake model of helicopter rotors is extended for wind turbine applications, the fast free wake method(FFW). The FFW was accomplished by partitioning the flow field downstream of the rotor into three regions :(1) the near wake, modeled as a series of straight vortex lines;(2) the intermediate wake, modeled as a number of vortex rings; and(3) the far wake, taken to be a semi-infinite cylindrical wake.

French

Domaine(s)
  • Théorie des gaz et aérodynamique
  • Énergie éolienne
DEF

Dans la théorie des tourbillons, une des trois dimensions issues de la séparation du champ d'écoulement en aval du rotor, modélisée sous forme d'un sillage cylindrique à demi infini.

Spanish

Save record 5

Record 6 2007-04-26

English

Subject field(s)
  • Aerodynamics and Theory of Gases
  • Wind Energy
DEF

In vortex theories, one of the three regions partitioning the flow field downstream of the rotor, modeled as a series of straight vortex lines.

CONT

Success of vortex theories in the performance analysis of horizontal axis wind turbines depends greatly upon accurate specification of the geometry of the vortex wake... An earlier wake model of helicopter rotors is extended for wind turbine applications, the fast free wake method(FFW). The FFW was accomplished by partitioning the flow field downstream of the rotor into three regions :(1) the near wake, modeled as a series of straight vortex lines;(2) the intermediate wake, modeled as a number of vortex rings; and(3) the far wake, taken to be a semi-infinite cylindrical wake.

French

Domaine(s)
  • Théorie des gaz et aérodynamique
  • Énergie éolienne
DEF

Dans la théorie des tourbillons, une des trois dimensions issues de la séparation du champ d'écoulement en aval du rotor, modélisée sous forme d'une série de lignes tourbillonnaires droites.

Spanish

Save record 6

Record 7 1990-03-06

English

Subject field(s)
  • Aircraft Propulsion Systems
DEF

An arrangement in which the turbine extracts just sufficient energy from high pressure gas to drive the compressor and where the gases leaving the turbine will still be at a pressure above atmospheric and can be expanded in a propelling nozzle to produce a high velocity jet. [From The Aircraft Gas Turbine and its operation, 1974, p. 7].

CONT

Gas turbine engines for aircraft come in many types and sizes, each of which has its advantages and also its limitations. The most common type is the uncomplicated turbojet, similar to the typical jet engine described earlier. Because it has no added features such as a fan, propeller, of free turbine, this kind of turbojet is sometimes referred to as straight jet engine. [From Jet Engine Fundamentals, 1978, p. 44].

French

Domaine(s)
  • Propulsion des aéronefs
DEF

Réacteur simple-corps ne comprenant aucun dispositif supplémentaire comme le double-flux, l'hélice. L'effort de propulsion y est obtenu uniquement par la détente des gaz dans un seul étage de turbine qu'entraîne un compresseur monoétage.

CONT

Les avantages du double-flux résident essentiellement dans sa forte poussée et sa consommation spécifique plus faible que celle d'un réacteur pur ou propulseur à réaction directe. [Tiré de "Thermopropulsion" de L. Bale, 1974, p. 195].

Spanish

Save record 7

Record 8 1976-06-19

English

Subject field(s)
  • Air Transport
OBS

... the free shaft turbine are higher...

French

Domaine(s)
  • Transport aérien
OBS

[...] turbine de travail ont une vitesse de rotation plus élevée [...]

Spanish

Save record 8

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