Lagrangian analysis method of flow field in detonation reaction zone of high explosives

1996 ◽  
Author(s):  
Zhengyu Zhang ◽  
Shi Huan ◽  
Fangyun Lu
Keyword(s):  
Flow Field ◽  
Reaction Zone ◽  
Analysis Method ◽  
Lagrangian Analysis ◽  
High Explosives ◽  
Detonation Reaction

Marine Ducted Propeller Blade Fracture Fault Diagnosis Technology Based on CFD

2014 ◽  
Vol 488-489 ◽  
pp. 1219-1223
Author(s):  
Li Jian Ou ◽  
Feng Hong Wang ◽  
Wei Zhang
Keyword(s):  
Fault Diagnosis ◽  
Numerical Model ◽  
Flow Field ◽  
Unsteady Flow ◽  
Hydrodynamic Performance ◽  
Analysis Method ◽  
Fluctuating Pressure ◽  
Ducted Propeller ◽  
Pressure Time ◽  
Ducted Propellers

The numerical model of the unsteady flow field of ducted propellers is based on CFD (computational fluid dynamics). By applying the numerical model, the unsteady flow field of the ducted propeller with the fracture in different positions of a certain blade is simulated and its unsteady hydrodynamic performance is numerically analyzed. By extracting the fluctuating pressure data of the duct inner wall monitoring points,the fluctuating pressure-time oscillogram of ducted propellers is obtained, and then the spectrum is obtained by FFT transformation of the oscillogram. A blade fracture fault diagnosis technology of ducted propellers, which combines oscillogram analysis method with spectrum analysis method, is put forward by analyzing and studying the oscillogram and the spectrum.

Chemical reaction zone and electrical conductivity profile in detonating high explosives

2019 ◽  
Vol 206 ◽  
pp. 249-251 ◽  
Author(s):  
Nataliya P. Satonkina ◽  
Alexander P. Ershov ◽  
Andrey V. Plastinin ◽  
Alexander S. Yunoshev
Keyword(s):  
Electrical Conductivity ◽  
Reaction Zone ◽  
Chemical Reaction ◽  
High Explosives ◽  
Chemical Reaction Zone ◽  
Conductivity Profile

A Study on the Flow Field Simulation of Insertion Flow Sensor in Large Diameter Pipeline

2014 ◽  
Vol 487 ◽  
pp. 470-474
Author(s):  
Jian Zhen Chen ◽  
Bin Li ◽  
Hui Wang ◽  
Xiao Man Lian ◽  
Yu Ming Xu
Keyword(s):  
Flow Field ◽  
Field Distribution ◽  
Vortex Shedding ◽  
High Performance ◽  
Cfd Simulation ◽  
Large Diameter ◽  
Flow Sensor ◽  
Analysis Method ◽  
Diameter Pipe ◽  
Important Basis

The study is to employ the analysis method of CFD simulation, when putting the insertion flow sensor in large-diameter pipe, to analyse the characteristics of flow field distribution of the insertion flow sensor in detail. It reveals the flow field distribution at the position of average flowrate and the vortex shedding around insertion flow sensor, which provides an important basis for design of the insertion flow sensor with high performance.

J0205-1-2 Investigation of analysis method of flow field around flapping wing by OpenFOAM

2010 ◽  
Vol 2010.6 (0) ◽  
pp. 29-30
Author(s):  
Shou WATANABE ◽  
Akihisa KONNO ◽  
Satoshi TERADA
Keyword(s):  
Flow Field ◽  
Flapping Wing ◽  
Analysis Method

Lagrangian Analysis Method with Least Square Cubic B-Spline

2011 ◽  
Vol 94-96 ◽  
pp. 1681-1684
Author(s):  
Wei Jun Tao ◽  
Shi Huan ◽  
Xiang Qian Tan ◽  
Guo Ping Jiang
Keyword(s):  
Least Square ◽  
Analysis Method ◽  
Lagrangian Analysis ◽  
B Spline ◽  
One Dimensional ◽  
Field Information ◽  
Strain Stress ◽  
Stress Profiles ◽  
Physical Quantities ◽  
Stress Relation

The Lagrangian analysis method is re-analyzed. It is shown that when a series of stress profiles (or strain profiles, or particle velocity profiles) are measured to determine the strain-stress relation. In this paper, the stress histories at different Lagrange positions are measured by one dimensional SHPB experiments. The variation histories of various physical quantities are fitted to least square cubic B-spline function with a sufficient accuracy definite condition. The path lines of these quantities are constructed in terms of a least square quadratic polynomial. A program for inert flow of Lagrangian analysis (IFLA) is worked out. Taking the data of experiments as the input for the IFLA, the flow field information is solved. The error analysis shows that such a method has a definite reliability and stability.

Energy output of insensitive high explosives by measuring the detonation products

1992 ◽  
Vol 339 (1654) ◽  
pp. 335-343
Keyword(s):  
Ambient Pressure ◽  
Physical Structure ◽  
Carbon Residue ◽  
Energy Output ◽  
Reaction Products ◽  
Detonation Products ◽  
High Explosives ◽  
Gaseous Reaction ◽  
Cyclotrimethylene Trinitramine ◽  
Detonation Reaction

The detonation products of high explosives are dependent on pressure and also on the confinement under which the detonation reaction proceeds. To determine the detonation products of less sensitive high explosives such as trinitrotoluene/ nitroguanidine and polymer bonded explosive charges with polybutadiene binder containing cyclotrimethylene trinitramine, together with or without aluminium, experiments have been performed in a stainless steel chamber of a volume of 1.5 m 3 . These experiments were done under different ambient argon pressures up to 0.3 MPa. Gaseous reaction products were analysed by mass spectrometry and chemiluminescence analysis. Solid reaction products were analysed for measuring the carbon residue or unreacted aluminium. It was found that the detonation products were highly dependent on the ambient pressure of argon. The most important changes of the reaction products and therefore also of the energy output were found between vacuum and atmospheric pressure of argon. With increasing pressure, H 2 and CO decrease and CO 2 , H 2 , C 8 , NH 3 , HCN and CH 4 increase together with the reaction enthalpy. By analysing the physical structure of the carbon residue, diamonds have been observed between 4 and 7 nm in diameter.

Lagrangian analysis of intermittent sound sources in the flow-field of a bluff-body stabilized combustor

2019 ◽  
Vol 31 (2) ◽  
pp. 025115 ◽  
Author(s):  
C. P. Premchand ◽  
Nitin B. George ◽  
Manikandan Raghunathan ◽  
Vishnu R. Unni ◽  
Raman I. Sujith ◽  
...  
Keyword(s):  
Flow Field ◽  
Bluff Body ◽  
Lagrangian Analysis ◽  
Sound Sources
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