Experimental study of a lenticular jet

Maddox, Alexandra; Gutmark, Ephraim

doi:10.1007/s00348-020-2930-z

Cited by 3 publications

(3 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In axis switching, the original exit shape of the jet changes and rotated in angle. More than one axis switching is possible in a noncircular jet and are reported for lenticular (Maddox and Gutmark, 2020), rectangular (Chen and Yu, 2014), square (Chua et al , 2001) and cruciform jets (Quinn and Azad, 2013; Fujita and Osaka, 1992).…”

Section: Resultsmentioning

confidence: 99%

“…The axis-switching phenomenon is considerably noted for noncircular jets, such as in elliptic (Miller et al , 1995), square (Chua et al , 2001) and lenticular jets (Maddox and Gutmark, 2020). The lenticular jet has both the corner feature of a square jet and the curvature feature of an elliptic jet, and more than one axis-switching location were noted.…”

Section: Introductionmentioning

confidence: 99%

“…The axis switching was not reported for pipe even though the outlets are noncircular. The axis switch is said to improve the entrainment and hence mixing (Maddox and Gutmark, 2020). The location of axis switching can be identified by the point of intersection between the velocity half–width (VHW) curves of major and minor planes.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of aspect ratio on mean flow characteristics of cruciform orifice jet

S.,

Sadrani,

B.T.

2023

AEAT

View full text Add to dashboard Cite

Purpose The purpose of this study reports the effects of aspect ratio (AR) on mean flow characteristics of the cruciform orifice jet. Design/methodology/approach The aspect ratio is the height-to-width ratio of the lobe of the cruciform shape. The aspect ratios considered are 0.25, 0.5, 0.75, 1, 2, 3 and 4. The turbulent jet flow is issued through an orifice being fitted to the jet tunnel facility. The velocity measurements are recorded with the help of pitot-static tube connected to a digital manometer setup. The Reynolds number calculated using the equivalent diameter 50.46 × 10–3 m and exit velocity 51.23 m/s was 1.75 × 105. Based on the experimental data, the streamline velocity decay plots, the potential core length (PCL), mean velocity profiles and velocity half widths were plotted, and discussions were made based on the measured data. A smoke-based flow visualization was carried out at moderate Reynolds number 5396. Findings The PCL remains almost constant for the aspect ratio 0.25:1 and then starts decreasing for the aspect ratio 1:4. The decrease in PCL indicates improved mixing. The off-center peaks are found along the major axis in mean velocity profiles for almost all cruciform jets. More than one axis switching occurs and can be identified by the crossover points. The location of the first crossover point shifts forward, and the second crossover point shows an oscillating trend. The flow visualization exhibits the jet evolution, and the distance up to which the jet maintains the cruciform shape is increased with the aspect ratio. Research limitations/implications The experiments are limited to air in air jet under isothermal conditions. Social implications The cruciform orifices can be used as fuel injectors and in air-conditioning systems, thereby improving efficiency and energy usage. Originality/value The aspect ratio effects on PCL and axis switching are used to explain the mixing characteristics. Flow visualization was also used to support the discussion.

show abstract