Measurement and Modeling of the Gas Turbine Blade Transition Process as Disturbed by Wakes

LaGraff, John E.; Ashworth, D. A.; Schultz, D. L.

doi:10.1115/1.3262271

Cited by 27 publications

(22 citation statements)

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“…The results of LaGraff et al [16] and Doorly et al [15] referred to above employed Wake Effect \ Spots Fig. 1.…”

Section: Introductionmentioning

confidence: 84%

“…These investigations established the usefulness of such non-intrusive sensors for the examination of intermittent flows. Following this work, Doorly et al [15] and LaGraff et al [16], studied the end-stage of the transition process on a gas-turbine blade in a two-dimensional cascade. Typical results of the work of LaGraff et al [16] are found in Figure 1, which is an illustration of the unsteady character of transition in a wake-disturbed environment.…”

Section: Introductionmentioning

confidence: 96%

“…1. Typical results from the work of LaGraff et al [16] illustrating the unsteady nature of transition in a wake-disturbed environment.…”

Section: Introductionmentioning

confidence: 97%

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On the propagation of naturally-occurring turbulent spots

1994

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Abstract. An experimental investigation of the propagation of turbulent spots occurring naturally during boundarylayer transition was conducted. Wide-bandwidth heat-transfer instrumentation was used in tracking individual turbulent spots as they progressed down a flat-plate surface toward fully-developed turbulence. The convection rates of the turbulent/non-turbulent interfaces of the spots in the streamwise direction were determined, as were rates of lateral spreading. The separate effects of compressibility and favourable pressure gradients have been assessed, and some typical results have been reported. List of symbols

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“…The results of LaGraff et al [16] and Doorly et al [15] referred to above employed Wake Effect \ Spots Fig. 1.…”

Section: Introductionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 96%

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On the propagation of naturally-occurring turbulent spots

1994

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“…ory of turbulent spots which accounts for wake induced and natural transition and shows excellent agreement with the experimental results. Other approaches to solve the problem have been proposed by Doorly (1987), LaGraff et al (1988 or interpreting the results of time resolved measurements obtained by means of high frequency response sensors.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Incident Wake Conditions on the Mean Heat Transfer of an Airfoil

Dullenkopf

Schulz

Wittig

1991

Journal of Turbomachinery

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The flow phenomena of wakes shed by upstream blade rows is a well-known problem in turbomachinery, which influences blade forces, vibrations, losses, and heat transfer. With respect to the heat load to turbine blades, this problem becomes even more complex because of the interaction between wake, potential flow, and the boundary layer along the surface of the airfoil. Experimentally evaluated mean heat transfer coefficients obtained under different unsteady initial conditions are reported. The heat transfer measurements have been carried out in the cascade test facility at the ITS in Karlsruhe, using a rotating bar wake generator placed upstream of the cascade to simulate the wake passing process. The variation of the wake parameters includes different wake passing frequencies, cascade inlet Reynolds numbers, and wake inclination angles. In addition, the relevant parameters of the unsteady wake have been measured by means of a fixed hot-wire anemometer using the ensemble-average technique. The results are compared to those from the literature for the wake of a cylinder in crossflow. They also serve as experimental base for parallel theoretical analyses.

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“…The effects of moving shocks generated by the bars have also been studied and again many interesting phenomena revealed [34,35]. The ability to identify turbulent and laminar boundary layers has led to further studies of transition on turbine blades [13,36]. Transition detection using heated thin films has long been an established technique and also employed by the Oxford group [37].…”

Section: The Isentropic Light Piston Tunnel (Ilpt) and Cascade Studiesmentioning

confidence: 99%

Gas Turbine Studies at Oxford 1969–1987

Jones

1988

Volume 4: Heat Transfer; Electric Power; Industrial and Cogeneration

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Gas turbine heat transfer studies commenced at Oxford University in 1969 when transient techniques previously used for measurements in hypersonic flows were applied to the gas turbine environment. Shock tubes were employed and subsequently a new form of transient tunnel, the Isentropic Light Piston Tunnel, was developed specifically for turbine heat transfer testing During the following years further short duration facilities were developed to study blade and vane external aerodynamics and also the heat transfer in cooling passages was examined using liquid crystal techniques. All these transient facilities are described and the development of the instrumentation peculiar to these is explained. The results of the work on external and internal heat transfer are summarised. In particular, the film cooling studies, the blade and vane external heat transfer work and the wake simulation experiments are outlined. This paper is dedicated to the late Don Schultz.

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Measurement and Modeling of the Gas Turbine Blade Transition Process as Disturbed by Wakes

Cited by 27 publications

References 0 publications

On the propagation of naturally-occurring turbulent spots

On the propagation of naturally-occurring turbulent spots

The Effect of Incident Wake Conditions on the Mean Heat Transfer of an Airfoil

Gas Turbine Studies at Oxford 1969–1987

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