RT Journal Article
ID 1179b051495e239c
A1 Bravo, Luis
A1 Kim, D.
A1 Ham, F.
A1 Su, S.
T1 COMPUTATIONAL STUDY OF ATOMIZATION AND FUEL DROP SIZE DISTRIBUTIONS IN HIGH-SPEED PRIMARY BREAKUP
JF Atomization and Sprays
JO AAS
YR 2018
FD 2018-06-05
VO 28
IS 4
SP 321
OP 344
K1 primary atomization
K1 volume of fluids
K1 fuels
K1 visualization
AB The fundamental physical process of an atomizing spray produced by a pulsed injector plays a crucial role in analyzing the combustion dynamics in many propulsion-related applications. A full understanding of the primary atomization process has not been achieved for several reasons, including difficulties in visualizing the optically dense region. Due to the recent advances in numerical
methods and computing resources, high-resolution simulations of atomizing flows are becoming available to provide new insights into the complex process. In the present study, an unstructured, unsplit volume-of-fluid (VoF) method is employed to model the liquid/gas interface and droplet
formation dynamics for a single pulsed-injection event issued from a complex diesel injector. Two single-component reference fuels, n-paraffin (n-dodecane) and isoparaffin (isooctane), were selected to study the influence of hydrocarbon fuel properties on the spray formation mechanisms. The spray is released into a quiescent environment filled with nitrogen gas at 20 bar and 300 K. The fuel transport properties at peak conditions for the cases considered are in the range of 6.9 × 103 < Re < 2.5 ×
104, 5.4 × 104 < We < 1.25 × 105, and 0.01 < Oh < 0.03 and set the spray in a transitional atomization regime. The simulations provide microscopic-level detail of the liquid/gas interface dynamics and droplet formation process with quantified statistics from first principles. Comparisons with experimental measurements and theory demonstrate the validity of the interface-capturing approach
and provide a novel analysis tool to explore the underlying breakup physics.
PB Begell House
LK https://www.dl.begellhouse.com/journals/6a7c7e10642258cc,4c8c93ef43f96b52,1179b051495e239c.html