Numerical Analysis of Nozzle Flows with Finite-Rate Surface Ablation and Pyrolysis-Gas Injection

2011 ◽  
Author(s):  
Daniele Bianchi ◽  
Alessandro Turchi ◽  
Francesco Nasuti
Keyword(s):  
Numerical Analysis ◽  
Gas Injection ◽  
Finite Rate ◽  
Pyrolysis Gas ◽  
Surface Ablation ◽  
Nozzle Flows

scholarly journals Numerical analysis of experiments with gas injection into liquid metal coolant

2016 ◽  
Vol 754 ◽  
pp. 112009
Author(s):  
E V Usov ◽  
P D Lobanov ◽  
N A Pribaturin ◽  
N A Mosunova ◽  
V I Chuhno ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Liquid Metal ◽  
Gas Injection ◽  
Liquid Metal Coolant ◽  
Metal Coolant

Numerical Analysis on Deployment Behaviors of Membrane Structure Systems

2006 ◽  
Author(s):  
M. Hashimoto ◽  
N. Kishimoto ◽  
Y. Miyazaki ◽  
M. C. Natori
Keyword(s):  
Numerical Analysis ◽  
Rotation Rate ◽  
Membrane Structure ◽  
Strain Energy ◽  
Gas Injection ◽  
Local Deformation ◽  
Numerical Results ◽  
Membrane Model ◽  
Filling Time ◽  
Membrane Models

This paper shows numerical analysis on dynamic deployment behaviors of membrane structure models embedding inflatable tubes. To treat their nonlinearity, one kind of nonlinear elasto-dynamic analysis methods characterized by modified stiffness matrix is applied. Analyzed models were proposed for future membrane structure systems inspired by insects' metamorphoses. In this paper, we focus on a balance between two kinds of deployment forces: centrifugal forces due to rotation of a central satellite and extension forces due to inflation of embedded tubes. We present numerical results of deployment behaviors of rectangular and hexagonal membrane models. Details of the numerical method are also discussed. Numerical results of the rectangular membrane model provide that there exist minimum values of maximum strain energy of membrane elements at appropriate gas filling time for each rotation rate. This means that we could control deployment behaviors by regulation of inflation rate of embedded tubes and rotation rate of a central satellite bus. Numerical results of the hexagonal membrane model provide that the case of deployment with gas injection shows more smooth deployment behavior without local deformation. In the case of deployment without gas injection there appears to be local deformation with high strain energy density.

Numerical Analysis of Ventilated Cavitation Using Non-Condensable Gas Injection on Underwater Vehicle

2011 ◽  
Author(s):  
Dong-Hyun Kim ◽  
Cong-Tu Ha ◽  
Warn-Gyu Park ◽  
Chul-Min Jung
Keyword(s):  
Numerical Analysis ◽  
Stokes Equations ◽  
Gas Injection ◽  
Curvilinear Coordinates ◽  
Navier Stokes ◽  
Cavitation Model ◽  
Navier Stokes Equations ◽  
Flow Solver ◽  
Ventilated Cavitation ◽  
Homogeneous Mixture Model

Supercavitating torpedo uses the supercavitation technology that can reduce dramatically the skin friction drag. The present work focuses on the numerical analysis of the condensable/non-condensable cavitating flow around the supercavitating torpedo. The governing equations are the Navier-Stokes equations based on the homogeneous mixture model. The cavitation model uses a new cavitation model which was developed by Merkle (2006). The multiphase flow solver uses an implicit preconditioning scheme in curvilinear coordinates. The ventilated cavitation is implemented by non-condensable gas injection on backward of cavitator cone and the base of the torpedo.

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