Detonation Velocity Measurement and Numerical Simulation for the System Consisting of Pellet Explosives and Air Gaps

2013 ◽  
Vol 767 ◽  
pp. 34-39 ◽  
Author(s):  
Shiro Kubota ◽  
Tei Saburi ◽  
Yuji Ogata ◽  
Kunihito Nagayama
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Detonation Velocity ◽  
Energetic Material ◽  
Initial Density ◽  
Detonation Products ◽  
Air Gaps ◽  
One Dimensional ◽  
Dimensional Simulation ◽  
The Relationship

The purpose of this study is to reconstruct the equation of state (EOS) whose parameters can be applied for high energetic material of arbitrary initial density without any modification. The simulation for detonation propagation in arbitrary initial density was proposed as the new method for obtaining the information of the EOS for detonation products of arbitrary initial density. At the same time, to collect the experimental data which verify the applicability of the numerical simulation, the detonation velocity for the system consisting of the pellet explosives and air gaps were conducted. The thickness of the 20 mm diameter pellet explosive was 10 mm, and air gaps were varied 0.5 mm to 2.0 mm. The relationship between detonation velocity and experimental condition was clarified for composition A5. The proposed one dimensional simulation was also conducted. The relationships between the pressure and the specific volume for detonation products were extracted from the proposed simulation

Study on Performance Optimization of Car Diesel Engine with VNT Based on One-Dimensional Simulation and Experimental Verification

2012 ◽  
Vol 155-156 ◽  
pp. 12-17 ◽  
Author(s):  
Lian Xu Wang ◽  
Da Wei Qu ◽  
Chang Qing Song ◽  
Ye Tian
Keyword(s):  
Experimental Data ◽  
Diesel Engine ◽  
Performance Optimization ◽  
High Speed ◽  
Turbine Blades ◽  
Simulation Software ◽  
Engine Operation ◽  
One Dimensional ◽  
Distribution Phase ◽  
Dimensional Simulation

To research the performance optimization of high speed car diesel engine，firstly according to the characteristic of car diesel engine with Variable Nozzle Turbocharger (VNT)， one-dimensional cycle model of the engine was established by using simulation software BOOST and validated by experimental data in this paper. The turbine blades’ opening corresponding to different speed was determined. Therefore the problem that the VNT surges at low engine speed and the inlet air flow is insufficient at high speed was solved. Based on the above model, this paper improved the efficiency of the engine by optimizing the compression ratio and the distribution phase of camshaft and then used the experimental data to check the simulation results. Meanwhile the fuel consumption and the possibility of the engine operation roughness decreased.

scholarly journals Investigating two kinds of cellular alternans and corresponding TWA induced by impaired calcium cycling in myocardial ischemia

2021 ◽  
Vol 18 (6) ◽  
pp. 7648-7665
Author(s):  
Jiaqi Liu ◽  
◽  
Zhenyin Fu ◽  
Yinglan Gong ◽  
Ling Xia
Keyword(s):  
Myocardial Ischemia ◽  
Conduction Velocity ◽  
Ionic Channel ◽  
Calcium Cycling ◽  
One Dimensional ◽  
T Wave ◽  
Cell Simulation ◽  
T Wave Alternans ◽  
Dimensional Simulation ◽  
The Relationship

<abstract> <sec><title>Background</title><p>The utility of T wave alternans (TWA) in identifying arrhythmia risk has been demonstrated. During myocardial ischemia (MI), TWA could be induced by cellular alternans. However, the relationship between cellular alternans patterns and TWA patterns in MI has not been investigated thoroughly.</p> </sec> <sec><title>Methods</title><p>We set MI conditions to simulate alternans. Either prolonging Ca<sup>2+</sup> release or increasing spark-induced sparks (secondary sparks) can give rise to different patterns of APD alternans and TWA. In addition, different ischemic zones and reduced conduction velocity are also considered in one dimensional simulation.</p> </sec> <sec><title>Results</title><p>Delay of Ca<sup>2+</sup> release can produce discordant Ca<sup>2+</sup>-driven alternans in single cell simulation. Increasing secondary sparks leads to concordant alternans. Correspondingly, morphology and magnitude of TWA vary in two different cellular alternans. Epi ischemia results in alternans concentrating in the first half of T wave. Endo and transmural ischemia lead to fluctuations in the second half of T wave. In addition, slowing conduction velocity has no effect on TWA magnitude.</p> </sec> <sec><title>Conclusion</title><p>Specific ionic channel dysfunction and ischemic zones affect TWA patterns.</p> </sec> </abstract>

Simulation and Experimental Study on the Impact of Breadth of Back Blade on Axial Force Balance

2011 ◽  
Vol 130-134 ◽  
pp. 1568-1572
Author(s):  
Hui Wang ◽  
Jie Gang Mu ◽  
Miao Yin Su ◽  
Shui Hua Zheng ◽  
Jin Jing Zhao ◽  
...  
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Experimental Study ◽  
Axial Force ◽  
Three Dimensional ◽  
Force Balance ◽  
Simulation And Experiment ◽  
Simulation Results ◽  
The Impact ◽  
The Relationship

The paper studies the relationship between axial force and breadth of back blade by numerical simulation and experiment. On the basis of the RNG k-ε turbulence model and technology of compact local grids and regional computing, three dimensional numerical simulations to 100HZ165-250 centrifugal pump with various breadths were carried out. Through comparing and analyzing of the flow field, it can be seen that the axial force reduces with the increase of the back blade breadth. After that, the simulation results were verified by the experimental data got from different test devices, and it shows that the conclusions are reliable.

Study and Simulation of the Model about High-Speed Maglev Drive Needles

2012 ◽  
Vol 503-504 ◽  
pp. 1037-1040
Author(s):  
Xiao Guang Wu ◽  
Ling Xue Kong ◽  
Li Zhu ◽  
Jun Fu ◽  
Yi Min Yang
Keyword(s):  
Experimental Data ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Control System ◽  
High Speed ◽  
Magnetic Suspension ◽  
Element Analysis ◽  
Air Gaps ◽  
Model Method ◽  
The Relationship

Based on the magnetic suspension theory, this paper has proposed a kind of suspension-type jacquard needle driving principle, and designed its 3-dimension model method. By making finite element analysis on suspension-type needles, analyzing the experimental data and designing the structure, we can get the relationship among related parameters under conditions of different permanent-magnet thickness and air gaps, which can provide criteria in theory and application for designing on new needle driving principle, control system and needle.

Numerical Simulation of 6061 Aluminum Alloys during the Semi-Solid Backward Extrusion

2011 ◽  
Vol 52-54 ◽  
pp. 1532-1537
Author(s):  
Shu Zhen Shang ◽  
Gui Min Lu ◽  
Xiao Ling Tang ◽  
Zu Xin Zhao ◽  
Wei Cao
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Deformation Behavior ◽  
Processing Parameters ◽  
Stress And Strain ◽  
Backward Extrusion ◽  
Simulation Results ◽  
Semi Solid ◽  
Distribution Of Stress ◽  
The Relationship

Effects of deformation temperature and strain rate on deformation behavior of semi-solid 6061 alloy were investigated on Gleeble3800 thermal-mechanical simulator. On basis of the experimental data of semi-solid 6061, a model was established to describe the relationship between the processing parameters and flow stress, which showed that the experimental results and calculation ones fitted well. It would be beneficial to realize the distribution of stress and strain during the semi-solid forming on the basis of numerical simulation technology. This research paper presented the numerical simulation results of the 6061 alloy during the backward extrusion thixoforming process.

Estimation of Initial State Dependence of Detonation Velocity Using Unified Form of EOS for PETN

2013 ◽  
Vol 767 ◽  
pp. 28-33
Author(s):  
Shiro Kubota ◽  
Tei Saburi ◽  
Yuji Ogata ◽  
Kunihito Nagayama
Keyword(s):  
Detonation Velocity ◽  
Initial Temperature ◽  
Coefficient Of Thermal Expansion ◽  
Initial Density ◽  
State Dependence ◽  
State Variables ◽  
Initial State ◽  
Density Derivative ◽  
The Relationship ◽  
Derivatives Of

The relationship between the initial temperature dependence of the detonation velocity and the initial density is examined using a proposed unified form of the EOS for pentaerythritol tetranitrate (PETN). First, the derivatives of the variables at Chapman-Jouguet (C-J) points are calculated. These derivatives are used to investigate the initial state dependence of the detonation velocity using the relationship between the detonation velocity and the initial state variables. As a result, the contributions of the coefficient of thermal expansion and the increment of the initial internal energy to the detonation velocity are clarified. We found that the initial temperature derivative of the detonation velocity can be estimated from the initial density derivative of the detonation velocity.

Numerical Simulation of AlxGa1-XN/GaN Hetero Junction Quantum Well by AMPS-1D

2011 ◽  
Vol 282-283 ◽  
pp. 518-521
Author(s):  
Kai Ju Zhang ◽  
B. Wan
Keyword(s):  
Numerical Simulation ◽  
Quantum Well ◽  
The Other ◽  
Simulation Program ◽  
One Dimensional ◽  
Photonic Structures ◽  
Other Hand ◽  
Dimensional Simulation ◽  
The One

In this work, the one dimensional simulation program called analysis of microelectronic and photonic structures (AMPS-1D) is used to study the performances of depth of AlxGa1-xN/GaN heterojunction quantum well. The calculated results of AMPS-1D software show that the effect of different Al composition on the depth of AlxGa1-xN/GaN heterojunction quantum well is slight. On the other hand, the effect of different doped concentration in AlxGa1-xN is obvious.

Study on Magnetic Suspension-Type Needle Driving Model for a New Knitting Device

2012 ◽  
Vol 215-216 ◽  
pp. 46-49 ◽  
Author(s):  
Xiao Guang Wu ◽  
Li Zhu ◽  
Shuang Li ◽  
Yu Qin Wu ◽  
Chi Zhang ◽  
...  
Keyword(s):  
Experimental Data ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Control System ◽  
Magnetic Suspension ◽  
Element Analysis ◽  
Air Gaps ◽  
Model Method ◽  
Driving Model ◽  
The Relationship

Based on the magnetic suspension theory, this paper has proposed a kind of suspension-type jacquard needle driving principle, and designed its 3-dimension model method. By making finite element analysis on suspension-type needles, analyzing the experimental data and designing the structure, we can get the relationship among related parameters under conditions of different permanent-magnet thickness and air gaps, which can provide criteria in theory and application for designing on new needle driving principle, control system and needle.

The Comparison with Numerical Simulation Results of Steam-Water Flow Field and Experimental Data for Car Exhaust Pipe

2011 ◽  
Vol 187 ◽  
pp. 570-574
Author(s):  
Qing Guo Liu ◽  
Yan Ma ◽  
Chun Mei Yang
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Flow Field ◽  
Separation Efficiency ◽  
Tangential Velocity ◽  
Exhaust Pipe ◽  
Two Phase ◽  
Car Exhaust ◽  
Simulation Results ◽  
The Relationship

In this paper, the physical model for flow field of exhaust pipe has been established on the condition of a liquid-gas exhaust pipe from cars using ethanol gasoline. The numerical simulation results for internal flow field of car exhaust pipe are compared with the experimental data. It is showed that the outside free vortex tangential velocity and axial velocity of single-phase flow field have been simulated better. It is indicated in the simulation of separation process of steam-water two-phase: The relative error, comparing the relationship between flow and separation efficiency with measured of that is less than 7%, and the same to 15%, comparing the relationship between flow and separation ratio with measured of that. Thereby, it is confirmed correctly for the mathematical model founded for numerical calculation and the algorithm selected.

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