Pressure flux-split viscous solutions for swirl diffusers

Pordal, H. S.; Khosla, P. K.; Rubin, S. G.

doi:10.1016/0045-7930(93)90031-4

Cited by 3 publications

(2 citation statements)

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“…As of swirl addition to the fl ow for performance improvement in conical diff users, many experimental studies have been carried out, for example, Neve and Wirasinghe (1978), Senoo et al (1978), Okhio et al (1983) and McDonald et al (1971), in which they all mention the appearance of a central recirculating zone depending on the swirl intensity. Numerical studies have also been developed to predict swirling fl ows, such as the predictions of Cho and Fletcher (1989), Armfi eld et al (1990), Okhio et al (1986) and Pordal et al (1993). Nonetheless, the experimental studies that have been carried out so far focus mostly on the performance analysis and improvement, using pressure recovery coeffi cient and effi ciency parameters.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Swirl Effects on Conical Diffuser Flows

Dauricio

Andrade

2017

J.Aerosp. Technol. Manag.

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The present paper focuses on the effect of swirl on important parameters of conical diffusers flows such as static pressure evolution, recirculation zones and wall shear stress. Governing equations are solved using a software based on the finite volume method. Moreover, turbulence effects are taken into account employing the k-ε RNG model with an ennhaced wall treatment. The Reynolds number has been kept constant at 10 5 , and various diffuser geometries were simulated, maintaining a high area ratio of 7 and varying the total divergence angle (16°, 24°, 40°, and 60°). Results showed that the swirl velocity component develops into a Rankine-vortex type or a forced-vortex type. In the former, swirl is not effective to prevent boundary layer separation, and a tailpipe is recommended to allow a large-scale mixing to enhance the pressure recovery process. In the latter case, boundary layer separation is prevented but an intermediary recirculation zone appears. Higher pressure recovery is attained at the exit of the diffuser with swirl addition, without the need of a tailpipe. Results also suggest that there is exists an imposed swirl intensity where the energy losses are minimum thus leading pressure recovery to an optimum level.

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