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Modeling of Unsteady Flow Effects in Throughflow Calculations

Magnus Stridh (Institutionen för tillämpad mekanik ; Institutionen för termo- och fluiddynamik)
Göteborg : Chalmers University of Technology, 2003.
[Licentiatavhandling]

In this work an evaluation of a deterministic stress transport model and a linearized Navier-Stokes harmonic approach for including unsteady effects in the steady mixing-plane computations of a multistage transonic compressor has been performed. The results of these two models are compared with those of time-average time-accurate solutions. The transport model for the deterministic stress terms (DST) was developed in the same manner as Wall(99), and the harmonic approach follows the work of Ning(98), He(98) and Chen(00). The harmonic approach accurately predicts the desired DST terms, while the transport model is shown to have some numerical problems close to solid walls, where the production of the deterministic stress is very high due to large gradients. Therefore the dissipation model is probably inaccurate . The harmonic approach also has the advantage of providing the periodic time variations as a result, and with some additional development also the ability to include clocking effects and noise predictions.

Nyckelord: Deterministic stress terms,transport equation, rotor-stator interaction, mixing-plane, Linear harmonic, linear Navier-Stokes, throughflow, turbomachinery, compressor, turbine, cascade



Denna post skapades 2006-08-28.
CPL Pubid: 10276

 

Institutioner (Chalmers)

Institutionen för tillämpad mekanik
Institutionen för termo- och fluiddynamik (1989-2004)

Ämnesområden

Tillämpad matematik

Chalmers infrastruktur

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Modeling Unsteady flow Effects in 3D Throughflow Calculations


Examination

Datum: 2003-12-20
Tid:
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