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Pressure-Scaling of Pressure-Swirl Atomizer Cone Angles

[+] Author Affiliations
D. R. Guildenbecher, R. R. Rachedi, P. E. Sojka

Purdue University

Paper No. IMECE2006-13203, pp. 207-213; 7 pages
doi:10.1115/IMECE2006-13203
From:
  • ASME 2006 International Mechanical Engineering Congress and Exposition
  • Energy Conversion and Resources
  • Chicago, Illinois, USA, November 5 – 10, 2006
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 0-7918-4783-7 | eISBN: 0-7918-3790-4
  • Copyright © 2006 by ASME

abstract

An experimental investigation was conducted to study the effects of increased ambient pressure (up to 6.89 MPa) and increased nozzle pressure drop (up to 2.8 MPa) on the cone angles for sprays produced by pressure-swirl atomizers having varying amounts of initial swirl. This study extends the classical results of DeCorso and Kemeny [1]. Shadow photography was used to measure cone angles at x/D0 =10, 20, 40, and 60. Our lower pressure results for atomizer swirl numbers of 0.50 and 0.25 are consistent with those of DeCorso and Kemeny [1], who observed a decrease in cone angle with an increase in a pressure drop-ambient density product until a minimum cone angle was reached at ΔPρair 1.6 ~200. Results for atomizers having higher swirl numbers do not match the DeCorso and Kemeny [1] results as well, suggesting that their correlation be used with caution. Another key finding is that an increase in ΔPρair 1.6 to a value of 1000 leads to continued decreases in cone angle, but that a subsequent increase to 4000 has little effect on cone angle. Finally, there was little influence of atomizer pressure drop on cone angle, in contrast to findings of previous workers. These effects are hypothesized to be due to gas entrainment.

Copyright © 2006 by ASME
Topics: Pressure

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