An analysis of fast-response pressure probes dynamics for ORC power systems. (September 2017)

• Record Type: Journal Article
• Authors: Molesini, P.; Gori, G.; Guardone, A.
• Is Part Of: Energy procedia. Volume 129(2017)
• Page Start: 264
• Page End: 271
• Publication Date: 2017-09
• Subjects: Non-ideal Compressible-Fluid Dynamics -- Fast-response pressure probes -- Line-cavity systems -- SU2 -- ORC power systems; Power resources -- Congresses; Power resources -- Periodicals; Power resources; Conference proceedings; Periodicals; 333.7905
• DOI: 10.1016/j.egypro.2017.09.152
• Languages: English
• ISSNs: 1876-6102

Abstract

Abstract: 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.