This paper contrasts traditional theory with observed flow patterns and develops explanations based on density variation, spill-over or rapid change of curvature. Impellers modified in the light of these explanations have shown efficiency improvements of 1–2 per cent. Some successes with flow visualization are described.
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References
1.
StanitzJ. D.Theoretical aerodynamic investigations of impellers in radial and mixed flow centrifugal compressors. Trans. ASME, 1952, 74, 473–497; also NACA reports 1949–50, 935, 945.
2.
FischerK.ThomaD.Investigation of the flow conditions in a centrifugal pump. Trans. ASME, 1932, 54, 141–155.
3.
LennemanE.HowardJ. H. C.Unsteady flow phenomena in rotating centrifugal impeller passages. Trans. ASME, J. Engng Pwr, 1970, 92, 65–72 (Mainly under throttled, surging conditions.).
4.
FowlerH. S.Some measurements of the flow pattern in a centrifugal compressor impeller. ASME paper 65 WA/GTP7, 1965; also Nat. Research Council of Canada Report DME-ME-220, 1966. (An extensive investigation at low Reynolds numbers.).
5.
EckardtD.Detailed flow investigations within a high-speed centrifugal compressor impeller. Trans. ASME, J. Fluid Engng, 1976, 98, 538–549. (Based on laser-Doppler measurements; to be read with (6) which complements it.).
6.
EckardtD.Instantaneous measurements in the jet-wake discharge flow of a centrifugal compressor impeller. Trans. ASME, J. Engng Pwr, 1975, 97, 337–345.
7.
RobertsB. D.Studies relating to transverse density gradient effects in centrifugal compressor impellers. Thesis in preparation, Department of Mechanical Engineering, Sheffield University.
8.
CameP. M.The development, application and experimental evaluation of a design procedure for centrifugal compressors. Proc. Instn Mech. Engrs, 1978, 192, 43–67 and discussion, S13–S20.
9.
ChevisR. W.VarleyR. J.Centrifugal compressors for small aero and automotive gas turbine engines. AGARD Propulsion and energetics Panel Specialist Meeting 55(B), 1980, Paper 21.
10.
SimpsonH. C.CinnamondC.Rotating camera studies of centrifugal water pumps with constant-width impellers, using particles. Proc. Instn Mech. Engrs, 1963, Pt 3I (ii), 43–56.
11.
SwiftD. W.Image rotation devices, a comparative survey. Optics and Laser Technology, 1972, IV, 175–188.
12.
SullivanD. L.Alignment of rotational prisms. Applied Optics, 1972, 2028–2033.
