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research-article

NUMERICAL STUDY OF DETERMINISTIC FLUXES IN COMPRESSOR PASSAGES

[+] Author and Article Information
Feng Wang

Oxford Thermofluids Institute, Department of Engineering Science, University of Oxford, UK
feng.wang@eng.ox.ac.uk

Mauro Carnevale

Department of Mechanical Engineering, University of Bath, UK
m.carnevale@bath.ac.uk

Luca di Mare

Oxford Thermofluids Institute, Department of Engineering Science, University of Oxford, UK
luca.dimare@eng.ox.ac.uk

1Corresponding author.

ASME doi:10.1115/1.4041450 History: Received July 12, 2018; Revised September 05, 2018

Abstract

Computational Fluid Dynamics (CFD) has been widely adopted at the compressor design process, but it remains a challenge to predict the flow details, performance and stage matching for multi-stage, high-speed machines accurately. The Reynolds Averaged Navier-Stokes (RANS) simulation with mixing plane for bladerow coupling is still the workhorse in the industry and the unsteady bladerow interaction is discarded. This paper examines these discarded unsteady effects via deterministic fluxes. The study starts from a planar duct under periodic perturbations. The study shows that under large perturbations, the mixing plane produces dubious mean flow variables, e.g. whirl angle. The performance of the mixing plane can be considerably improved by including deterministic fluxes into the mixing plane formulation. This demonstrates the effect of deterministic fluxes at the bladerow interface. Furthermore the front stages of a 19-blade row compressor are investigated and URANS solutions are compared with RANS solutions. The magnitude of divergence of Reynolds stresses and deterministic stresses are compared. The effect of deterministic fluxes are demonstrated on whirl angle and radial profiles of total pressure and so on. The enhanced spanwise mixing due to deterministic fluxes are also observed. The effect of deterministic fluxes are confirmed via the non-linear harmonic method which includes the deterministic fluxes in the mean flow and the study of multistage compressor shows that unsteady effects, which are quantified by deterministic fluxes, are indispensable to have credible predictions of the flow details and performance of compressor even at its design stage.

Rolls-Royce plc
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