Flying hot-wire measurements in an axisymmetric sudden expansion

Cole, Daniel R.; Glauser, Mark

doi:10.1016/s0894-1777(98)10014-6

Cited by 22 publications

(24 citation statements)

References 22 publications

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“…These findings were similar to Johnston (1976), who reportedly observed large scale structures on the order of the step-height convecting through this region. The investigation of Johnston (1976) Additional findings from Cole & Glauser (1998a) concluded that for an expansion ratio of 3, the turbulent kinetic energy (TKE) was found highest between five and eight stepheights downstream from the expansion lip, at r/R ≈ 0.2. This was thought to occur near the core because of the merging of the inner shear layers.…”

Section: Introductionmentioning

confidence: 93%

Low-dimensional azimuthal characteristics of suddenly expanding axisymmetric flows

et al. 2006

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Two rakes of cross-wire probes were used to capture the two-point velocity statistics in a flow through an axisymmetric sudden expansion. The expansion ratio of the facility is 3, and has a constant geometry. Measurements were acquired at a Reynolds number equal to 54,000 based on centerline velocity and inlet pipe diameter. The two-point velocity correlations were obtained along a plane normal to the flow (r, θ), at eleven downstream step-height positions spanning from the recirculating region, through reattachment, and into the redeveloping region of the flow. Measurements were acquired by means of a flying hot-wire technique to overcome rectification errors near the outer wall of the pipe where flow recirculations were greatest. A mixed application of Proper Orthogonal (in radius) and Fourier Decomposition (in azimuth) was performed at each streamwise location to

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Section: Introductionmentioning

confidence: 93%

Low-dimensional azimuthal characteristics of suddenly expanding axisymmetric flows

et al. 2006

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“…To overcome this limitation, several authors have used "flying" probes. 20,21 In such a case, the probe is moved against the normal direction to the flow to impose a net velocity onto the sensing element. The effect of the probe translational velocity is subtracted during the processing of the signal.…”

Section: Measurement Of the Liquid Velocitymentioning

confidence: 99%

Power spectral distributions of pseudo-turbulent bubbly flows

et al. 2013

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An experimental study was carried out to determinate the power spectral density (PSD) of mono-dispersed bubbly flows in a vertical channel using flying hot-film anemometry. To improve bubble detection, optical fibers were installed in close proximity to the anemometer sensing element; in this way, the collisions of bubbles with the probe can be detected and removed from the signal. Measurements were performed with gas fractions up to 6%. The PSD distributions were found to decay with a power of −3, in agreement with previous studies, but for a much wider range of Reynolds and Weber numbers. Our measurements indicate that the power decay does not depend strongly on the nature of hydrodynamic interactions among bubbles. C 2013 AIP Publishing LLC. [http://dx.

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“…There are excellent agreements between the current solutions and those of the Cole, et al The mean velocity profiles at x/h=1.0 and x/h=3.0 indicate that there is a recirculation zone behind the step. Cole, et al 17 reports that the reattachment length of this recirculation is approximately as large as 9 step heights. This value is extremely close to an average of 9.1 measured by Stieglmeier, et al 18 for an axisymmetric sudden expansion.…”

Section: Turbulent Axisymmetric Flow In a Pipe With Sudden Expansionmentioning

confidence: 92%

“…There are a wide range of experimental solutions for this test case. This test case has been studied experimentally by Cole et al 17 Its geometry is given in Fig. 4.…”

Section: Turbulent Axisymmetric Flow In a Pipe With Sudden Expansionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Calculation of Turbulent Reacting Flow in a Model Gas-Turbine Combustor

Schneider

Darbandi

Ghafourizadeh

2009

41st AIAA Thermophysics Conference

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In this work, an efficient bi-implicit strategy is suitably developed within the context of a hybrid finite volume element method to solve axisymmetric turbulent reactive flow in a model gas turbine combustor. Based on the essence of a control-volume-based finiteelement method, the formulation benefits from the geometrical flexibility of the finite element methods while the discrete algebraic governing equations are derived through applying the conservation laws to discrete cells distributed in the solution domain. To enhance the efficiency of method, we extend the physical influence upwinding scheme to cylindrical coordinates. This extension helps to improve the advection flux approximations at all cell faces. Besides a high level of respecting the physics of flow, this scheme provides the necessary coupling between the velocity and pressure fields. In order to achieve a better prediction of both the transport of turbulent species and the transport of mass fraction species, the two-equation k − ǫ turbulence model and one step mixture fraction chemistry equation are solved in a semi-implicit manner. Eventually, the extended method is used to simulate reacting flow in a model gas turbine combustor. The validation of the current numerical results is fulfilled by comparing the current results with available measurements and other reliable numerical solutions.

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Flying hot-wire measurements in an axisymmetric sudden expansion

Cited by 22 publications

References 22 publications

Low-dimensional azimuthal characteristics of suddenly expanding axisymmetric flows

Low-dimensional azimuthal characteristics of suddenly expanding axisymmetric flows

Power spectral distributions of pseudo-turbulent bubbly flows

Numerical Calculation of Turbulent Reacting Flow in a Model Gas-Turbine Combustor

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