Non-ideal oblique shock waves. (21st May 2018)

• Record Type: Journal Article
• Authors: Vimercati, Davide; Gori, Giulio; Guardone, Alberto
• Is Part Of: Journal of fluid mechanics. Volume 847(2018)
• Page Start: 266
• Page End: 285
• Publication Date: 2018-05-21
• Subjects: gas dynamics, -- shock waves; Fluid mechanics -- Periodicals; 532.005
• DOI: 10.1017/jfm.2018.328
• Languages: English
• ISSNs: 0022-1120

Abstract

Abstract : From the analysis of the isentropic limit of weak compression shock waves, oblique shock waves in which the post-shock Mach number is larger than the pre-shock Mach number, named non-ideal oblique shocks, are admissible in substances characterized by moderate molecular complexity and in the close proximity to the liquid–vapour saturation curve. Non-ideal oblique shocks of finite amplitude are systematically analysed, clarifying the roles of the pre-shock thermodynamic state and Mach number. The necessary conditions for the occurrence of non-ideal oblique shocks of finite amplitude are singled out. In the parameter space of pre-shock thermodynamic states and Mach number, a new domain is defined which embeds the pre-shock states for which the Mach number increase can possibly take place. The present findings are confirmed by state-of-the-art thermodynamic models applied to selected commercially available fluids, including siloxanes and hydrocarbons currently used as working fluids in renewable energy systems.