THE VELOCITY FIELD OF A DUCKBILL VALVE (DBV) JET IN COFLOW

Abstract eng:
A systematic three-dimensional numerical study using k-ε model and laboratory measurement by laser-doppler anemometry (LDA) on a duckbill valve (DBV) jet with varying large aspect ratios in coflow is presented. The numerical computations and LDA measurements show that: i) the jet spreading in the major and minor axes are distinctly different in the near-field; a strong “axis-switching” firstly appears in this region at X/D ≈ 1.5-2; ii) the velocity distribution in the major and minor axis planes can be well-approximated by a Gaussian distribution for X/D > 4; iii) the cross-sectional turbulent intensity distribution is double-peak shaped in the near field with maximum value of around 0.23.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket