1976
DOI: 10.1115/1.3448347
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Effects of System Rotation on the Performance of Two-Dimensional Diffusers

Abstract: Experiments with incompressible flow are reported concerning the effects of Coriolis acceleration on flow separation and on separated flow in plane-wall diffusers of rectangular cross section. The diffusers were rotated about an axis perpendicular to the plane of the nearly two-dimensional flow in order to simulate some features of the blade-to-blade flow distribution in the radial portion of the centrifugal impeller. Various stall regimes are mapped on coordinates of rotation number and diffuser area ratio (a… Show more

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Cited by 22 publications
(7 citation statements)
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“…For the unshrouded impeller, however, they observed pressure side separation which was suggested to be associated with the vortex sheet generated from the blade tip which rolled up along the blade suction side. The rolled up vortex was also observed by Senoo et al (1968) in mixed flow impellers. Howard and Kittmer (1975) later conducted hot film measurements inside an impeller similar to the low speed Lennemann (1969) impeller, and confirmed the existence of a single vortex in the unshrouded impeller.…”
Section: Stationary Unsteadinessmentioning
confidence: 63%
“…For the unshrouded impeller, however, they observed pressure side separation which was suggested to be associated with the vortex sheet generated from the blade tip which rolled up along the blade suction side. The rolled up vortex was also observed by Senoo et al (1968) in mixed flow impellers. Howard and Kittmer (1975) later conducted hot film measurements inside an impeller similar to the low speed Lennemann (1969) impeller, and confirmed the existence of a single vortex in the unshrouded impeller.…”
Section: Stationary Unsteadinessmentioning
confidence: 63%
“…In this first design step the main dimensions and blade angles have been found applying 1D equations, starting from statistical relationships and literature data to set the ranges for the main unknown design parameters. Among others, the literature source was constituted for compressor 1D design mainly by [12][13][14][15][16][17][18] and for the turbine 1D design by [19][20][21][22]. For the 1D design, in house developed codes have been utilized.…”
Section: Preliminary Designmentioning
confidence: 99%
“…Values are between 0.0 and 0.33, similar to the ones observed in large radial impellers shown in Table 1. Experimental studies [1,2,3,4] indicate an increase of turbulence on the pressure side and a decrease on the suction side (relaminarization) resulting in a decrease/ increase of the boundary layer thickness on the respective sides. They also show an enhancement of the secondary flows by the migration of the fluid along the endwalls from pressure side to suction side.…”
Section: Introductionmentioning
confidence: 97%
“…The flow in the impeller is characterized by very low Reynolds numbers and significant Coriolis forces. Typical Reynolds numbers, in h,in W d Re ν = (1) are between 3 000 and 30 000, which is at the limit where turbulence models have been studied. (W in = average inlet velocity, d h.in = inlet hydraulic diameter, ν = kinematic viscosity) The impact of Coriolis forces is characterized by the rotation number.…”
Section: Introductionmentioning
confidence: 99%