Title: Numerical analysis of the oscillation frequency of the shock wave and the evaporation level on the Mach disc in the IMP PAN nozzle

Authors: Sebastian Kornet; Janusz Badur

Addresses: Energy Conversion Department, The Szewalski Institute of Fluid Flow Machinery Polish Academy of Sciences, Fiszera 14, 18-231 Gdańsk, Poland ' Energy Conversion Department, The Szewalski Institute of Fluid Flow Machinery Polish Academy of Sciences, Fiszera 14, 18-231 Gdańsk, Poland

Abstract: In the present paper, we have focused on the phenomena occurring in the supersonic part of the de Laval nozzle, characterised by oscillation of the shock wave in steam flow. The effect of shock oscillation was observed by using the Töpler optical system in the IMP PAN experiment carried out on a symmetrical planar de Laval nozzle. Having observed the shock fluctuation in wet steam flow, according to Puzyrewski's observations, we analysed the oscillation frequency in the IMP PAN nozzle depending on the pressure conditions. Additionally, we analysed the evaporation level of condensate droplets during passage through the Mach disc depending on the inlet conditions. The model of a single continuum wet steam model with a special microstructure growing up during phase transitions was validated on an experiment carried out by Dykas et al. in 2013 on the half arc nozzle. The present work includes simulations results of oscillation frequency of the shock wave and the evaporation level of the liquid phase on the Mach disc.

Keywords: shock wave; de Laval nozzle Mach disc; λ-foot; wet steam; evaporation level.

DOI: 10.1504/PCFD.2017.088793

Progress in Computational Fluid Dynamics, An International Journal, 2017 Vol.17 No.6, pp.352 - 360

Received: 03 Nov 2016
Accepted: 13 Mar 2017

Published online: 13 Dec 2017 *

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