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Chapter 7 can consist in attributing the same uncertainty to the speed of sound, as reported in Fig. 7.14. It can be concluded that the facility is effective in performing measurements of wave propagation speed in high temperature organic vapours, with an accuracy comparable with the available thermodynamic models. 120 110 100 90 80 0 0.02 0.04 0.06 0.08 0.1 ∆ P [bar] Figure 7.14: Wave Speed in D6 siloxane as a function of the pressure drop, evaluated with a TOF method applied to the PIT1 and PIT2 pressure signals reported in Fig. 7.13. The dotted line corresponds to the estimation provided by the equation of state presented in Ref. [19], with the shadowed region representing the preliminary assumed expanded uncertainty of 6%. 7.6 Conclusions & Future Work In this chapter a new Ludwieg tube facility called the FAST is described, that is able to measure speed and intensity of waves propagating through the fluid contained in the tube. The final objective of this setup is to provide the first experimental evidence of the rarefaction shock waves (RSWs) in the dense vapor region of fluids formed by complex organic molecules. The pressure and tem- perature of the fluid can be regulated independently from each other, such that any thermodynamic state can be achieved within the limits of the facility (≈ 30 bar and 400 ◦C). The leakage rate of the facility is found to be acceptable, and the fast opening valve is characterized in terms of its aperture time, which is found to be compatible to the end of measuring a RSW in D6 siloxane. Tests of shock formation in air are presented, and used to validate the functioning of the facility and of the measurement procedure. Preliminary results regarding expansions in D6, up to fluid temperatures close to 300 ◦C, further show the capabilities of the FAST of achieving and maintaining the desired thermodynamic conditions, as well as of obtaining wave speed and intensity measurements. As for the next step of the work, the RSW experiment will be attempted. 196 w [m/s]PDF Image | New Concepts FOR Organic Rankine Cycle Power Systems
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