Abstract
The operating characteristics of a turbo-compressor are tightly depending on the steady and unsteady operating characteristics of its powering turbine. The present study is aimed to highlight the flow structures through the twin-entry volute and the rotor of a radial turbine. The influence of tongue wake is depicted by a low momentum toward the rotor entry, but the effect of this critical region does not extend beyond a tangential angle of 90deg. The unsteady simulations at different operating conditions and the FFT analyses of the pressure fluctuations due components interactions have revealed a space-time periodic behaviour that may be described by the double Fourier decomposition. The time mode analysis has permitted to determine the different frequencies and the prevailing modes. Different results were obtained based on the type of computational domains; accordingly the one-blade simulation did not reveal all the flow features as was the case of full-rotor simulation.
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