Results of numerical modeling of solid fuel melting and shedding by hot gas flow are presented. The computational model is based on the Volume-of-Fluid approach, implemented on a two-dimensional Cartesian grid, with one-equation turbulence model. Simulations are presented for a slab of wax interacting with a parallel gas flow, with the properties taken to be typical of hybrid engines (nitrous oxide). Development of Kelvin-Helmholtz instability in the melt layer is demonstrated, including the wave formation and droplet shedding by the flow.

Topics
Fuels, Rocket engines, Numerical methods, Computational models, Turbulence theory and modelling, Flow instabilities
1.
A.
 
Mazzetti
,
L.
 
Merotto
, and
G.
 
Pinarello
, “
Paraffin-based hybrid rocket engines applications: A review and a market perspective
,”
Acta Astronautica
 
126
,
286
(
2016
).
https://doi.org/10.1016/j.actaastro.2016.04.036
Google Scholar
Crossref
Search ADS
 
2.
A.
 
Karabeyoglu
,
G.
 
Zilliac
,
B. J.
 
Cantwell
,
S.
 
DeZilwa
, and
P.
 
Castellucci
, “
Scale-up tests of high regression rate paraffin-based hybrid rocket fuels
,”
Journal of Propulsion and Power
 
20
,
1037
(
2004
).
https://doi.org/10.2514/1.3340
Google Scholar
Crossref
Search ADS
 
3.
A.
 
Weinstein
 and
A.
 
Gany
, “
Testing and modeling liquefying fuel combustion in hybrid propulsion
,”
Progress in Propusion Physics
 
4
,
99
–
112
(
2013
).
https://doi.org/10.1051/eucass/201304099
Google Scholar
Crossref
Search ADS
 
4.
S.
 
Rashkovskiy
 and
S.
 
Yakush
, “
Numerical simulation of low-melting temperature solid fuel regression in hybrid rocket engines
,”
Acta Astronautica
 
176
,
710
–
716
(
2020
).
https://doi.org/10.1016/j.actaastro.2020.05.002
Google Scholar
Crossref
Search ADS
 
5.
S. R.
 
Allmaras
,
F. T.
 
Johnson
, and
P. R.
 
Spalart
, “
Modifications and clarifications for the implementation of the Spalart-Allmaras turbulence model
,” in
Seventh International Conference on Computational Fluid Dynamics, ICCFD7-1902
(
2012
) pp.
1
–
11
.
Google Scholar
 
6.
J. R.
 
Edwards
 and
S.
 
Chandra
, “
Comparison of eddy viscosity-transport turbulence models for three-dimensional, shock-separated flowfields
,”
AIAA Journal
 
34
,
756
–
763
(
1996
).
https://doi.org/10.2514/3.13137
Google Scholar
Crossref
Search ADS
 
7.
J. H.
 
Ferziger
 and
M.
 
Peric
,
Computational Methods for Fluid Dynamics
, 3rd ed. (
Springer-Verlag
,
Berlin, Heidelberg
,
2002
).
Google Scholar
Crossref
Search ADS
 
8.
F.
 
Xiao
,
S.
 
Ii
, and
C.
 
Chen
, “
Revisit to the THINC scheme: A simple algebraic VOF algorithm
,”
Journal of Computational Physics
 
230
,
7086
–
7092
(
2011
).
https://doi.org/10.1016/j.jcp.2011.06.012
Google Scholar
Crossref
Search ADS
 
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