The Research of Applied Analysis Method on Shaped Charge Detonation Parameters

For avoid the perforation accident, oil perforating urgent need to calculate accurately shaped charge detonation parameters to guide the design and construction of perforation. According to the charge type and characteristics of shaped charge, based on traditional detonation theory and detonation parameters calculated method, this paper first determining shaped explosive detonation reaction equation, then analysis the shaped charge detonation heat, detonation temperature, detonation tolerance and detonation pressure and detonating velocity, extract the analytical methods of shaped charges detonation parameters suitable for oil at last. The specific practices: determined the reaction equation of shaped charges explosive with a maximum heat release rule; determined detonation heat, detonation temperature and detonation tolerance with law of Hess, internal energy value method and Avogadro law; calculated detonation velocity and pressure by Kamlet law; use engineering calculation method to analyze the detonating velocity as to the non-C-H-N-O composition shaped charges which containing feeling agent, bonding agent, flammable agent, plasticizer and other active agent; by revision Kamlet formula, get detonation pressure calculation formula.

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Theoretical Calculation of the Detonation Parameters of Nitropyrazoles Explosives

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.853.395 ◽

2013 ◽

Vol 853 ◽

pp. 395-400 ◽

Cited By ~ 2

Author(s):

Ya Jin Li ◽

Yong Xiang Li ◽

Yan Hong Wang ◽

Duan Lin Cao ◽

Zhen Ming Jiang ◽

...

Keyword(s):

Energy Density ◽

Theoretical Calculation ◽

Detonation Velocity ◽

Structural Unit ◽

High Energy ◽

High Energy Density ◽

Detonation Pressure ◽

Detonation Parameters ◽

High Energy Density Material ◽

Detonation Temperature

A series of new nitropyrazole explosive molecules were designed with N-nitropyrazole as structural unit, The detonation parameters of nitropyrazoles explosives, such as detonation velocity, detonation pressure, detonation temperature, detonation volume, were estimated theoretically in different methods, The calculated detonation pressure was corresponded with high energy density material (HEDM). Their detonation velocity and detonation pressure are between those of TATB and HMX. These compounds have higher detonation temperature and heat of detonation compared with HMX and TATB. It was predicted that these explosives are of favorable stability.

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Risk Analysis of Road Tunnels: A Computational Fluid Dynamic Model for Assessing the Effects of Natural Ventilation

Applied Sciences ◽

10.3390/app11010032 ◽

2020 ◽

Vol 11 (1) ◽

pp. 32

Author(s):

Ciro Caliendo ◽

Gianluca Genovese ◽

Isidoro Russo

Keyword(s):

Natural Ventilation ◽

Fluid Dynamic ◽

Movement Time ◽

Radiant Heat ◽

Heat Fluxes ◽

Maximum Heat ◽

Road Tunnels ◽

Maximum Heat Release ◽

Computational Fluid Dynamics Cfd ◽

Time Required

We have developed an appropriate Computational Fluid Dynamics (CFD) model for assessing the exposure to risk of tunnel users during their evacuation process in the event of fire. The effects on escaping users, which can be caused by fire from different types of vehicles located in various longitudinal positions within a one-way tunnel with natural ventilation only and length less than 1 km are shown. Simulated fires, in terms of maximum Heat Release Rate (HRR) are: 8, 30, 50, and 100 MW for two cars, a bus, and two types of Heavy Goods Vehicles (HGVs), respectively. With reference to environmental conditions (i.e., temperatures, radiant heat fluxes, visibility distances, and CO and CO2 concentrations) along the evacuation path, the results prove that these are always within the limits acceptable for user safety. The exposure to toxic gases and heat also confirms that the tunnel users can safely evacuate. The evacuation time was found to be higher when fire was related to the bus, which is due to a major pre-movement time required for leaving the vehicle. The findings show that mechanical ventilation is not necessary in the case of the tunnel investigated. It is to be emphasized that our modeling might represent a reference in investigating the effects of natural ventilation in tunnels.

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Effect of Mechanical Activation on Ti3AlC2 Max Phase Formation under Self-Propagating High-Temperature Synthesis

Eurasian Chemico-Technological Journal ◽

10.18321/ectj249 ◽

2015 ◽

Vol 17 (3) ◽

pp. 233 ◽

Cited By ~ 8

Author(s):

A.Yu. Potanin ◽

P.A. Loginov ◽

E.A. Levashov ◽

Yu.S. Pogozhev ◽

E.I. Patsera ◽

...

Keyword(s):

Mechanical Activation ◽

Front Propagation ◽

Max Phase ◽

Structural Defects ◽

Powder Mixtures ◽

Maximum Heat ◽

High Temperature Synthesis ◽

Maximum Heat Release ◽

Kinetics Of ◽

Pressing Technology

In this study, we have investigated the effect of various mechanical activation (MA) modes on phase and structure formation in powder mixtures made up to produce Ti3AlC2 MAX phase. The optimal MA duration has been established which results in the maximum heat release under SHS due to accumulation of structural defects leading to the growth of internal energy. The effect of MA on the character and kinetics of combustion front propagation has been investigated. It was shown that following pretreatment of a powder mixture in a planetary ball mill, the combustion mode changes from stationary to a pulsating combustion and, consequently, the combustion rate decreases. The burning-out of the sample is partial and with interruptions (depressions). Force SHS-pressing technology was used for obtaining of compacted samples with homogeneous structure based on Ti3AlC2.

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Investigation of Hydration Features of the Special Concrete with Aggregates of Various Metal Particles

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.604.297 ◽

2014 ◽

Vol 604 ◽

pp. 297-300 ◽

Cited By ~ 1

Author(s):

Ina Pundienė ◽

Viktor Mironov ◽

Aleksandrs Korjakins ◽

Edmundas Spudulis

Keyword(s):

Compressive Strength ◽

Metal Particles ◽

Concrete Sample ◽

Structure Development ◽

Concrete Composition ◽

Maximum Heat ◽

Sample Composition ◽

Maximum Heat Release ◽

Sample Structure ◽

Compressive Strength Of Concrete

This study presents an analysis of various size metal particle waste (MP) influences on Portland cement (PC) paste hydration course, concrete sample structure densification during hardening and physical-mechanical properties. Investigations have shown that MP filler accelerates maximum heat release rate in PC pastes. MP intensifies structure development in the early phase, but slows it down in later PC hydration period. After 28-days of hardening the compressive strength of the concrete samples without MP filler is about 20% higher than of samples with MP. When in concrete composition microsilica and MP fillers are used together, compressive strength of concrete sample composition is up to 50% higher than of samples with MP filler only.

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Comparison Between Measured Radiance and a Radiation Model in a Spark-Ignition Engine

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.2906499 ◽

1990 ◽

Vol 112 (3) ◽

pp. 331-334 ◽

Cited By ~ 5

Author(s):

J. Yang ◽

S. L. Plee ◽

D. J. Remboski ◽

J. K. Martin

Keyword(s):

Heat Release ◽

Release Rate ◽

Maximum Rate ◽

Spark Ignition ◽

Rate Of Change ◽

Operating Conditions ◽

Spark Ignition Engine ◽

Maximum Heat ◽

Radiant Intensity ◽

Maximum Heat Release

Measurements of the radiant emission in the near infrared have been obtained in a spark-ignition engine over a wide range of operating conditions. The system includes an in-cylinder optical sensor and associated detector. Prior work has shown correlations between the measured radiance and pressure quantities such as maximum cylinder pressure, crank angle of maximum pressure, and Indicated Mean Effective Pressure. Here are presented comparisons between the radiant intensity and a simplified model of the radiation emission, which demonstrate that the measured intensity is a function of the mass-burn fraction, mean burned-gas temperature, and the exposed combustion-chamber surface area. Further simplification leads to the conclusion that the time of the maximum rate of change of radiant intensity is the same as for the maximum heat-release rate, leading to the possibility of feedback control of spark timing. In addition, the magnitudes of the maximum rate of change of radiant emission and maximum heat-release rate have a linear relationship over a range of different operating conditions.

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Influence of Size and Construction Schedule of Massive Concrete Structures on Its Temperature Regime

MATEC Web of Conferences ◽

10.1051/matecconf/201825102014 ◽

2018 ◽

Vol 251 ◽

pp. 02014 ◽

Cited By ~ 4

Author(s):

Nikolay Aniskin ◽

Chuc Nguyen Trong ◽

Long Hoang Quoc

Keyword(s):

Temperature Regime ◽

Temperature Effects ◽

Concrete Columns ◽

Maximum Heat ◽

Massive Concrete ◽

Massive Structure ◽

Number Of Factors ◽

Maximum Heat Release ◽

Maximum Temperatures ◽

Construction Schedule

Cracking is an important problem in the process of building a concrete massive structure. The overwhelming majority of cracks occurring in the concrete are usually caused by temperature effects. Because of this, it is essential to control and regulate temperature, it is necessary to prevent cracking. The formation of the temperature regime of a massive structure is affected by a large number of factors: its size; cement consumption and its maximum heat release; temperature of the concrete to be laid; ambient temperature, etc. In this paper, we consider the influence of the size and construction schedule of a massive concrete structure on its temperature regime. Using the computer program Midas civil 2011, the temperature regime was calculated, maximum temperatures were obtained in massive concrete and massive concrete columns with different sizes. The analysis of possible fracture for different values of the factors are considered.

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OH* Chemiluminescence and OH-PLIF Measurements in a Micro Gas Turbine Combustor

Volume 2: Combustion, Fuels and Emissions, Parts A and B ◽

10.1115/gt2010-22800 ◽

2010 ◽

Cited By ~ 1

Author(s):

Martina Hohloch ◽

Rajesh Sadanandan ◽

Axel Widenhorn ◽

Wolfgang Meier ◽

Manfred Aigner

Keyword(s):

Heat Release ◽

Combustion Chamber ◽

Gas Turbine ◽

Thermal Power ◽

Gas Turbine Combustor ◽

Maximum Heat ◽

Micro Gas Turbine ◽

Power Load ◽

Reaction Zones ◽

Maximum Heat Release

In this work the combustion behavior of the Turbec T100 natural gas/air combustor was analyzed experimentally. For the visualization of the flame structures at various stationary load points OH* chemiluminescence and OH-PLIF measurements were performed in a micro gas turbine test rig equipped with an optically accessible combustion chamber. The OH* chemiluminescence measurements are used to get an impression of the shape and the location of the heat release zones. In addition the OH-PLIF measurements enabled spatially and temporarily resolved information of the reaction zones. Depending on the load point the shape of the flame was seen to vary from cylindrical to conical. With increasing thermal power load the maximum heat release zones shift to a lifted flame. Moreover, the effect of the optically accessible combustion chamber on the performance of the micro gas turbine is evaluated.

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Fundamental Study on Relations of Mixing Progress to NO_x Formation and Maximum Heat Release Rate in Direct-Injection PCCI Combustion(Thermal Engineering)

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B ◽

10.1299/kikaib.76.769_1441 ◽

2010 ◽

Vol 76 (769) ◽

pp. 1441-1448

Author(s):

Takuji ISHIYAMA ◽

Naoto HORIBE ◽

Shunsuke SOMEZAWA ◽

Satoshi OSHIMA

Keyword(s):

Heat Release ◽

Heat Release Rate ◽

Release Rate ◽

Direct Injection ◽

Thermal Engineering ◽

Fundamental Study ◽

Maximum Heat ◽

Maximum Heat Release

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Estimation of Magnitude and Heat Release Rate of Fires Occurring in Historic Buildings-Taking Churches as an Example

Sustainability ◽

10.3390/su13169193 ◽

2021 ◽

Vol 13 (16) ◽

pp. 9193

Author(s):

Wen-Yao Chang ◽

Chieh-Hsin Tang ◽

Ching-Yuan Lin

Keyword(s):

Heat Release ◽

Heat Release Rate ◽

Release Rate ◽

Water Mist ◽

Smoke Detector ◽

Fire Dynamics ◽

Historical Building ◽

Maximum Heat ◽

Improvement Measures ◽

Maximum Heat Release

Historical buildings often fail to meet today’s building and fire protection regulations due to their structure and space restrictions. For this reason, if such buildings encounter fire, serious damage will be resulted. The fire of the Notre-Dame Cathedral in Paris (Notre-Dame de Paris) in April 2019 highlights the seriousness of this problem. In this study, the historical building of “Tamsui Church” was selected as an example. The Fire Dynamics Simulator (FDS) was adopted to analyze the scale of damage and possible hazards when the wooden seats in the church are on fire, and improvement measures were proposed to ensure that such buildings can be used under safer conditions. It was found that the existing seat arrangement will cause the spreading of fire, and the maximum heat release rate is 2609.88 kW. The wooden roof frame above the fire source will also start to burn at 402.88 s (6.6 min) after the fire, which will lead to a full-scale fire. To maintain the safety of the historical building, it is necessary to add active firefighting equipment (smoke detector and water mist system).

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