Influence of nozzle shape on flow field of multiple jets

Influence of nozzle aspect ratio and orientation on flow characteristics of multiple elliptic jets

“…The output data were recorded by a data acquisition system. The symmetry of the flow field of multiple round jets with a 6×6 array in the near field of nozzle exit was confirmed (Svensson et al, 2014;Teramoto et al, 2018aTeramoto et al, , 2018b. Therefore, the measurements were carried out at the upper-right quadrant area of the flow field of the multiple elliptic jets.…”

“…The combined point signifies that the multiple jets merged completely and change into a single jet flow. The multiple round jets became a single jet at same position (Teramoto, 2018b). The centerline velocity distributions had no significantly difference in the range of x/De ≳ 3, where the combined region.…”

“…Figure 4 shows distributions of dimensionless centerline velocity, u ̅c /Ub, for multiple elliptic jets with the aspect ratio of a/b = 2.25 and 6.25, and the same and alternate azimuthal orientation arrangement. The results for multiple round jets issuing from 6×6 square matrix arrangement with nozzle spacing ratio, l/d = 3 (Teramoto et al, 2018b), single circular orifice jet at Re = 5×10 3 (Shakouchi et al, 2009) and single round jet at Re = 9.55×10 4 (Hussein et al, 1994) are also shown in Fig. 4.…”

“…They showed that the multiple round jets merged and developed into a single round jet similar to a confluent twin jet. Teramoto et al (2018aTeramoto et al ( , 2018b experimentally studied the influence of the nozzle spacing ratio on the flow characteristics of multiple round jets in a 6×6 arrangement using 10 mm thickness nozzle plate. They found that the curvature of the jets at the side of the ambient fluid decreased with increasing spacing ratio, and that the jets merged at the downstream.…”

“…To improve the performance multi-jet applications, such as mixing device for combustible gas and air and so on, it is necessary to understand the mixing and evolution of multiple non-circular jets in comparison with the 6×6 multiple circular jets (Ghahremanian et al, 2014b;Svensson et al, 2014;Teramoto et al, 2018aTeramoto et al, , 2018b The mean and fluctuating velocities were measured using hot-wire anemometers with a cross-wire probe. The linearized output signals from CTA were converted using A/D converter at 10 kHz, and 5×10 4 data points were recorded.…”