Abstr:Low-speed centrifugal compressor

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Application Area 6: Turbomachinery Internal Flows

Application Challenge AC6-02

Abstract

The LSCC is an experimental facility designed to duplicate the essential flow physics of high-speed subsonic centrifugal compressor flow fields in a large size, low-speed machine.

A complete description of the experimental facility for the LSCC case is provided by Hathaway et al. (1993, 1995). A considerable amount of data including static pressure profiles, total temperature and total pressure profiles, flow angles are provided at different span locations as well as static pressure contours on blade surfaces, velocity vectors near blade surfaces, throughflow velocity contours at different streamwise stations.

The LSCC application challenge is a state-of-the-art flow problem that addresses the impact of physical models and grid point distribution on the accuracy of the predicted flow solution which is dominated by complex secondary flows and wakes.

The design or assessment parameters are represented by two indicators, the overall pressure ratio and the adiabatic efficiency. The DOAPs are detailed below:

• The overall pressure ratio: This DOAP is calculated from the plenum total pressure (equal to the static pressure at standard conditions pstd) and the energy-average of the pitch averaged spanwise total pressure distribution at survey station 2.

Pressure ratio=<P_t>/p_std

• The adiabatic efficiency: This DOAP is calculated based on the average total pressure at station 2 and the mass average of the pitch averaged spanwise distribution of the total temperature at station 2. Pressure and temperature at standard conditions are used as reference values:

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Contributors: Nouredine Hakimi - NUMECA International

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