2016
DOI: 10.1115/1.4033973
|View full text |Cite
|
Sign up to set email alerts
|

Unsteady Operation of a Highly Supersonic Organic Rankine Cycle Turbine

Abstract: Organic Rankine cycle (ORC) turbogenerators are the most viable option to convert sustainable energy sources in the low-to-medium power output range (from tens of kWe to several MWe). The design of efficient ORC turbines is particularly challenging due to their inherent unsteady nature (high expansion ratios and low speed of sound of organic compounds) and to the fact that the expansion encompasses thermodynamic states in the dense vapor region, where the ideal gas assumption does not hold. This work investiga… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
1
1
1
1

Citation Types

0
14
1

Year Published

2017
2017
2024
2024

Publication Types

Select...
8

Relationship

1
7

Authors

Journals

citations
Cited by 28 publications
(15 citation statements)
references
References 31 publications
0
14
1
Order By: Relevance
“…Differently from what is reported in Ref. [32] for a larger radial inflow ORC turbine, the shocks generated by the supersonic stator have a weak effect on the rotor flow-field and do not induce flow separation on the blade suction side, as displayed in Fig. 8(c).…”
Section: Assessment Of Stator-rotor Interaction Effectscontrasting
confidence: 72%
“…Differently from what is reported in Ref. [32] for a larger radial inflow ORC turbine, the shocks generated by the supersonic stator have a weak effect on the rotor flow-field and do not induce flow separation on the blade suction side, as displayed in Fig. 8(c).…”
Section: Assessment Of Stator-rotor Interaction Effectscontrasting
confidence: 72%
“…Fluids of the siloxane family are identified as promising fluids for experimental observation of non-ideal-gas compressible fluid dynamics near the TCP (Colonna, Guardone & Nannan 2007) and have recently been targeted as working fluids in newly designed experimental facilities aiming at reproducing these conditions (Guardone, Spinelli & Dossena 2013;Spinelli et al 2015;Head et al 2016). Toluene has a simpler molecular complexity (lower value of c v /R in the ideal-gas limit) compared with siloxane D6 and is currently used as a working fluid in ORC turbines (Colonna et al 2015;Rinaldi, Pecnik & Colonna 2016). The thermodynamic model considered here is the 12-parameter Span-Wagner (SW) (Span 2000) functional form EOS developed for siloxanes by Colonna, Nannan & Guardone (2008) and for toluene by Lemmon & Span (2006).…”
Section: Towards Experimental Observationsmentioning
confidence: 99%
“…In this respect, further conclusions should be drawn only after a detailed comparison with measurements or high-fidelity CFD computations [36]. Detailed CFD studies [64,66,77] on high-pressure ratio turboexpanders indicate that unsteady Reynolds-Averaged Navier Stokes (URANS) simulations can provide a reliable performance estimation.…”
Section: Discussionmentioning
confidence: 99%
“…In the literature, nozzle losses have been often neglected or considered of a much lower entity than the rotor losses [52]. However, experimental works [3,64] on high-pressure turbines and numerical studies [65,66] on very high-pressure ratio RITs suggest that a proper nozzle model, and associated losses, are paramount to obtain meaningful results.…”
Section: Empirical Models For Losses and Flow Deviationmentioning
confidence: 99%