JICFJapan International Cooperation Foundation
JICFJoint Integrated Communications Facility
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Figure 12 is an overall view of vortex structure in the pulsating JICF at Re = 100 with r = 4 and St = 0.22.
Comparison of the time-averaged longitudinal vorticity at x = 6D for the four cases ((a) C4, (b) C8, (c) C12, and (d) C16) is shown in Figure 13, where early evolution of the JICF appears.
In the vorticity contours of JICF, there will be some coupling between the positive and negative vortex structures.
The CRVP of a round JICF can generate a stable performance for C4, C12, and C16, while the CRVP for C8 has shown the difference.
At the start of JICF as shown in Figure 14, the streamlines evolved from the nozzle in the near field are curved by the crossflow.
A latent phenomenon is that there is no returning streamline into the nozzle on both the leeward and windward sides near the exit of the nozzle; however, the returning streamlines are generated in the pulsating JICF (Figures 14(b), 14(c), and 14(d)).
The nondimensional temperature in JICF can be defined as [30]
The compared results demonstrate that the temperature profiles become quite different between the classical JICF and pulsating JICF.
(1) The JICF penetrates higher at higher velocity ratio.
Under the pressure gradient, the vortex diameter will be in rapid expansion, and a pair of counter-rotating vortex can be generated along the JICF direction.
(3) For the time-averaged longitudinal vorticity, the coupling magnitude of positive and negative vorticity differs in the classical and pulsating JICF. Compared with the classical JICF, the generated streamlines for the pulsating JICF in the near field have shown different phenomena.
Caption: Figure 7: The time-averaged particle trajectories for the classical and pulsating JICF (blue line for C1~C4, black line for C9-C12).