Numerical Simulations of Heterogeneous AP/HTPB Propellant Combustion with Aluminum

2006 ◽  
Author(s):  
Alain Bizot
Keyword(s):  
Numerical Simulations ◽  
Propellant Combustion ◽  
Htpb Propellant

Investigation of Stick Propellant Internal Perforation Erosive Burning on Interior Ballistics Performances

2016 ◽  
Vol 67 (1) ◽  
pp. 19
Author(s):  
Xiaoliang Zhao ◽  
Xiaobing Zhang
Keyword(s):  
Numerical Simulations ◽  
Significant Influence ◽  
Combustion Process ◽  
Ballistic Performance ◽  
Interior Ballistics ◽  
Propellant Combustion ◽  
Erosive Burning ◽  
Weak Influence

In this study, a thorough investigation of a stick propellant internal perforation erosive burning on interior ballistic performances is presented via extending the previous work of author. The stick propellant combustion process and the internal perforation erosive burning are revealed by numerical simulations. Different factors with respect to the stick propellant, including propellant length, internal perforation diameter and loading density are analysed in detail. Stick propellant length and the internal perforation diameter have a significant influence on the ballistic performance, the longer and smaller internal propellant have a greater erosive burning effect to the ballistic performance. Loading density has very weak influence on the ballistic.

Aluminum agglomeration in AP/RDX/Al/HTPB propellant combustion

1991 ◽  
Author(s):  
TAI-KANG LIU ◽  
HUEY-CHERNG PERNG ◽  
SONG-PING LUH ◽  
FANG LIU
Keyword(s):  
Propellant Combustion ◽  
Htpb Propellant

scholarly journals Investigation of the agglomeration reduction mechanism of the aluminized HTPB propellant containing ferric perfluorooctanoate [Fe(PFO)3]

RSC Advances ◽  
2019 ◽  
Vol 9 (33) ◽  
pp. 19031-19038 ◽  
Author(s):  
Fei Zhen ◽  
Xuyuan Zhou ◽  
Meishuai Zou ◽  
Lingchao Meng ◽  
Rongjie Yang ◽  
...  
Keyword(s):  
Solid Propellant ◽  
Reduction Mechanism ◽  
Propellant Combustion ◽  
Htpb Propellant

In this study, ferric perfluorooctanoate [Fe(PFO)3] was used in the aluminized HTPB propellant to reduce Al agglomeration during solid propellant combustion, and the agglomeration reduction mechanism was experimentally demonstrated.

Saturation mechanism and generated viscosity in gravito-turbulent accretion disks

2020 ◽  
Vol 640 ◽  
pp. A53
Author(s):  
L. Löhnert ◽  
S. Krätschmer ◽  
A. G. Peeters
Keyword(s):  
Growth Rate ◽  
Numerical Simulations ◽  
Accretion Disks ◽  
Gravitational Instability ◽  
Turbulent Viscosity ◽  
Radial Distance ◽  
Maximum Growth ◽  
Wave Number ◽  
Radiative Cooling ◽  
Mixing Length

Here, we address the turbulent dynamics of the gravitational instability in accretion disks, retaining both radiative cooling and irradiation. Due to radiative cooling, the disk is unstable for all values of the Toomre parameter, and an accurate estimate of the maximum growth rate is derived analytically. A detailed study of the turbulent spectra shows a rapid decay with an azimuthal wave number stronger than ky−3, whereas the spectrum is more broad in the radial direction and shows a scaling in the range kx−3 to kx−2. The radial component of the radial velocity profile consists of a superposition of shocks of different heights, and is similar to that found in Burgers’ turbulence. Assuming saturation occurs through nonlinear wave steepening leading to shock formation, we developed a mixing-length model in which the typical length scale is related to the average radial distance between shocks. Furthermore, since the numerical simulations show that linear drive is necessary in order to sustain turbulence, we used the growth rate of the most unstable mode to estimate the typical timescale. The mixing-length model that was obtained agrees well with numerical simulations. The model gives an analytic expression for the turbulent viscosity as a function of the Toomre parameter and cooling time. It predicts that relevant values of α = 10−3 can be obtained in disks that have a Toomre parameter as high as Q ≈ 10.

CHARACTERIZATION OF SPLASH-PLATE ATOMIZERS USING NUMERICAL SIMULATIONS

2007 ◽  
Vol 17 (4) ◽  
pp. 347-380 ◽  
Author(s):  
Mohammad P. Fard ◽  
Denise Levesque ◽  
Stuart Morrison ◽  
Nasser Ashgriz ◽  
J. Mostaghimi
Keyword(s):  
Numerical Simulations
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