MODELING ATOMIZATION PROCESSES OF PRESSURE-SWIRL HOLLOW-CONE FUEL SPRAYS

1997 ◽  
Vol 7 (6) ◽  
pp. 663-684 ◽  
Author(s):  
Zhiyu Han ◽  
Scott Parrish ◽  
Patrick V. Farrell ◽  
Rolf D. Reitz
Keyword(s):  
Hollow Cone ◽  
Fuel Sprays ◽  
Pressure Swirl

Asymmetric Transverse Acoustic Excitation of a Hollow Cone Spray Sheet With Air Swirl

2019 ◽  
Author(s):  
Rohit R. Bhattacharjee ◽  
Aravind I. Babu ◽  
Satyanarayanan R. Chakravarthy
Keyword(s):  
Cone Angle ◽  
Acoustic Excitation ◽  
Hollow Cone ◽  
Breakup Length ◽  
Swirl Angle ◽  
Transverse Acoustic ◽  
Spray Axis ◽  
Acoustic Forcing ◽  
Pressure Swirl ◽  
Hollow Cone Spray

Abstract The objective of this study was to experimentally observe the effects of externally perturbing a hollow cone spray sheet with acoustic excitation. These effects were quantified by measuring changes in the spray breakup length, swirl angle, and oscillatory behaviour of the sheet edge. We used a pressure swirl nozzle embedded into a swirler with 60° vane angles and a geometric swirl no. of SG = 0.981. Water was used to produce a hollow cone spray sheet and air was used as our swirler agent. For asymmetric forcing, only one side of the spray chamber was attached to a transverse duct (aligned perpendicular to the spray axis) along with two speakers. The duct harmonics were found to be 115 Hz, 204 Hz, and 313 Hz. Our experimental modes were also found to be comparable with results obtained numerically using the acoustic solver package from ANSYS. Our results show that for most cases the spray edges, cone angle, and breakup length responds to the acoustic forcing. While the cone angle increased with air swirl, for some cases without acoustic forcing the breakup length increased with air swirl.

Studies on the Behavior of Droplets and the Air Flow in a Hollow-Cone Spray

1998 ◽  
Vol 120 (3) ◽  
pp. 586-592 ◽  
Author(s):  
Tatsuyuki Okamoto ◽  
Toshimi Takagi ◽  
Toshikazu Kaji ◽  
Katsunori Shimazaki ◽  
Kenji Nakanishi
Keyword(s):  
Equations Of Motion ◽  
Liquid Sheet ◽  
Experimental Result ◽  
Hollow Cone ◽  
Air Stream ◽  
Droplet Sizes ◽  
Swirl Atomizer ◽  
Pressure Swirl ◽  
Hollow Cone Spray

Experimental and numerical investigations are made on the behavior of droplets in a hollow-cone spray paying attention to the liquid sheet formed at the orifice of pressure-swirl atomizer. Simultaneous measurements of droplet sizes and velocities are made by phase-Doppler technique and numerical simulations are carried out based on the transient Eulerian equations for the gas and the Lagrangian equation for the droplets, taking account of the liquid sheet formed at the atomizer orifice. It is shown that the simulation gives good predictions by incorporating the existence of the liquid sheet. The predicted results indicate that the movement of the liquid sheet induces a strong air stream which acts as a strong side wind against the droplets immediately after breakup. This air stream selectively transports small droplets toward the central region and plays an essential role in the classification of droplets by size. Accordingly, the existence of the liquid sheet is significant for the characteristics of droplet dispersion and it should not be neglected in the prediction of hollow-cone spray flows. In addition, the shape of the liquid sheet is theoretically computed based on the simplified equations of motion. The comparison between the theoretical computation and the experimental result suggests that the surface tension of liquid is predominant in determining the shape of the liquid sheet.

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