Performance Evaluation of Multi Stage Fans Using CFD

Gogoi, Aishwarjya; Rao, K.V.L.

doi:10.2514/6.2002-3538

Cited by 1 publication

(1 citation statement)

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“…The simulation overestimates the pressure ratio (2 per cent) but slightly under predicts the efficiency although the predictions are almost within the measuring uncertainties. Similar over prediction of pressure ratio and underestimation of efficiency for NASA Rotor 37 have been reported by a large number of authors [17,18]. Increasing the number of grid points is reported to be beneficial to the prediction precision but is not substantial for small over predictions [19].…”

Section: Cfd Validationsupporting

confidence: 79%

Performance enhancement in transonic axial compressors using blade tip injection coupled with casing treatment

Beheshti

Farhanieh

Ghorbanian

et al. 2005

Proceedings of the Institution of Mechanical Engineers, Part A:

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The casing treatment and flow injection upstream of the rotor tip are two effective approaches in suppressing instabilities or recovering from a fully developed stall. This paper presents numerical simulations for a high-speed transonic compressor rotor, NASA Rotor 37, applying a state-of-the-art design for the blade tip injection. This is characterized by introducing a jet flow directly into the casing treatment machined into the shroud. The casing treatment is positioned over the blade tip region and exceeds the impeller axially by ∼30 per cent of the tip chord both in the upstream and in the downstream directions. To numerically solve the governing equations, the three-dimensional finite element based finite volume method CFD solver CFX-TASCflow (version 2.12.1) is employed. For a compressible flow with varying density, Reynolds-averaging leads to appearance of complicated correlations. To avoid this, the mass-weighted or Favre-averaging is applied. Using an injected mass flow of 2.4 per cent of the annulus flow, the present design can improve stall margin by up to 7 per cent when compared with a smooth casing compressor without tip injection. This research can lead to an optimum design of recirculating casing treatments or other mechanisms for performance enhancement applying tip flow injection.

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Section: Cfd Validationsupporting

confidence: 79%