CREA Lab | An analysis of fast-response pressure probes dynamics for ORC power systems
16253
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An analysis of fast-response pressure probes dynamics for ORC power systems

The dynamic response of line-cavity systems in ideal and non-ideal compressible-fluid conditions is investigated numerically using the SU2 open-source suite for multi-physics simulations. The response of the system is studied for small but finite pressure perturbations, to predict the behaviour of fast-response pressure probes in turbomachinery for gas and ORC power systems. The probe step-response is found to present significant damping due to non-linear wave propagation. Non-idealities in the close proximity of the liquid-vapour curve increase the signal damping due to non-monotone variations of the speed of sound. A simplified approach is proposed to predict the probe dynamic characteristics in ideal regime. The estimation of the probe dynamics in non-ideal regime is found to be very critical and to strongly depend on the thermodynamic state of the fluid. The present results provides a guideline for the design of fast-response pressure probes to be used e.g. past the rotor stage of ORC turbine vanes.
 

Authors

P. Molesini, G. Gori, A. Guardone

Year

2017

Source

Energy Procedia, Volume 129, September 2017, Pages 264-271, ISSN 1876-6102

Category
Conference Paper
Tags
Fast-response pressure probes, Line-cavity systems, Non-ideal Compressible-Fluid Dynamics, ORC power systems, SU2