Laser velocimetry measurements in a laboratory vaned diffuser

Davis, Mike; Flack, Ronald D.

doi:10.1007/bf00575333

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…Davis and Flack [3] studied the effect of the number of blades on the performance of a radially vaned diffuser considering three different blade configurations with laser Doppler anemometry (LDA). They measured velocity components for four, six, and eight blades.…”

Section: Introductionmentioning

confidence: 99%

Measurements of Reynolds stresses in centrifugal compressor vaned diffusers

Pınarbaşı

Guleren

Öztürk

2008

Proceedings of the Institution of Mechanical Engineers, Part C:

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A phase lock loop sampling technique has been developed in order to perform detailed measurements for the flow field downstream of a turbomachinery rotor. Measurements have been carried out in the vaned diffuser of a low-speed centrifugal compressor using a triple hot wire anemometer. The phase lock loop technique employed in this work has provided a comprehensive representation of the complex three-dimensional unsteady flow in these diffusers. The diffuser vanes were found to have a significant influence on the flow in the vaneless space. The mixing out of the blade wakes is enhanced and accordingly the Reynolds stress levels drop rapidly between the impeller exit and the vane leading edge. The results provide an insight into the flow mechanisms responsible for the losses and hence can be used to develop better design strategies in the future. The flow also exhibits high levels of anisotropy, especially at the mid-vane positions. This suggests that basic Reynolds-averaged Navier—Stokes (RANS) models, including standard one- or two-equation models, might not be sufficient to accurately model the flow in centrifugal compressor diffusers.

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Section: Introductionmentioning

confidence: 99%

Measurements of Reynolds stresses in centrifugal compressor vaned diffusers

Pınarbaşı

Guleren

Öztürk

2008

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…(1986) and Brownell et. al (1987) or by Davis and Flack (1990), which can only provide some of the information necessary to understand the diffuser flow of a radial stage. The very significant variation of the flow field at the impeller exit at different operating points is missing in these cases.…”

Section: Introductionmentioning

confidence: 99%

Flow Phenomena in a Vaned Diffuser of a Centrifugal Stage

Dalbert

Gyarmathy

Sebestyen

1993

Volume 1: Aircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery

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The 3D viscous flow code BTOB3D of Dawes has been applied to a standard geometry of a vaned diffuser of an industrial centrifugal compressor stage. The objective of the work was to check the ability to calculate the performance of cascade diffusers and to investigate possibilities of representing the results for a better understanding of the flow phenomena. The computations are compared with the measurements at different operating points. The theoretical results are represented in numerous 2D and 3D illustrations for the description and comparison of the design and off-design flow fields within the investigated diffuser. They show that the knowledge of the wall pressures and wall streamlines does not fully reveal the extremely complex 3D flow within such a diffuser. Moreover, the technique of flow visualization by using moving pictures on a video film was applied, aimed at enhancing the physical understanding of the flow effects in vaned diffusers. Nomenclature diffuser width flow velocity impeller tip diameter incidence = "flow angle" minus "vane angle" tip speed Mach number = u2/'(K R To*) inlet stagnation pressure gas constant reduced radius = r / r2 impeller tip radius = D2 / 2 length diffuser blade length inlet stagnation temperature blade tip speed ratio of specific heats compressor total pressure ratio Subscripts 2 impeller outlet cross component hub incidence mean shroud II

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Optimization of a Diffuser With Splitter by Numerical Simulation

Drtina

Dalbert

Rütti

et al. 1993

Volume 1: Aircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery

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Three-dimensional, viscous, and compressible flow calculations have been performed in order to improve the performance of a radial compressor diffuser with splitter. All calculations were carried out applying a commercially available finite-volume Navier-Stokes code. Diffuser design procedure, grid generation and boundary conditions are described in detail. For each diffuser type several operating points ranging from the surge limit to choke were considered. Velocity distributions showing regions of separation are discussed for different diffuser geometries. The downstream evolution of the pressure recovery coefficient is given along both diffuser channels. Calculations have been verified by experimental investigations on full scale diffuser prototypes providing pressure values at defined locations.

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Laser velocimetry measurements in a laboratory vaned diffuser

Cited by 3 publications

References 10 publications

Measurements of Reynolds stresses in centrifugal compressor vaned diffusers

Measurements of Reynolds stresses in centrifugal compressor vaned diffusers

Flow Phenomena in a Vaned Diffuser of a Centrifugal Stage

Optimization of a Diffuser With Splitter by Numerical Simulation

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