Title: Evaluation of notional nozzle approaches for CFD simulations of free-shear under-expanded hydrogen jets
Citation: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY vol. 37 no. 23 p. 18563-18574
Publication Year: 2012
JRC N°: JRC71100
ISSN: 0360-3199
URI: http://www.sciencedirect.com/science/article/pii/S0360319912022021
DOI: http://dx.doi.org/10.1016/j.ijhydene.2012.09.135
Type: Articles in periodicals and books
Abstract: Several approaches are usually applied for modelling the source of high pressure underexpanded jets, ranging from the computationally expensive resolution of the jet’s shock structure to simple formulae (pseudo-source or notional nozzle approaches). However, the assumptions made in each approach introduce inaccuracies in the CFD calculations. The objective of this work was twofold; to compare and evaluate the performance of both selected notional nozzle approaches and turbulence models with experimental results of free-shear high momentum H2 round jets. The experimental data covered horizontal H2 releases issuing from small nozzles (0.25 to 1 mm diameter). Three two-equation turbulence models were chosen for the simulations, the popular standard k-ε, the Shear Stress Transport (SST) and the baseline (BSL) k-w model together with five notional nozzle approaches. The numerical results were presented in a systematic way in order to make general conclusions on the performance of both the approaches and models.
JRC Directorate:Energy, Transport and Climate

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