Ionization phenomena near the combustion surface of ballistic powder

1985 ◽  
Vol 20 (5) ◽  
pp. 525-527 ◽  
Author(s):  
Yu. S. Ivashchenko ◽  
V. M. Zenchenko ◽  
V. L. Pavlenko ◽  
A. L. Sadyrin
Keyword(s):  
Combustion Surface ◽  
Ballistic Powder

scholarly journals Synergistic Flame-Retardant Mechanism of Dicyclohexenyl Aluminum Hypophosphite and Nano-Silica

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1211 ◽  
Author(s):  
Heng Zhang ◽  
Junliang Lu ◽  
Hongyan Yang ◽  
Heng Yang ◽  
Jinyan Lang ◽  
...  
Keyword(s):  
Flame Retardant ◽  
Combustion Surface ◽  
Carbon Layer ◽  
Material Surface ◽  
Infrared Analysis ◽  
Index Test ◽  
Nano Silica ◽  
Cone Calorimetry ◽  
Flame Retardant Property ◽  
Aluminum Hypophosphite

The flame retardant dicyclohexenyl aluminum hypophosphite (ADCP) and nano-silica are added to PA66 to improve flame retardant property of the composite. The flame-retardant property of the composite is tested via oxygen index test, vertical burning test, and cone calorimetry test. Combustion residues are tested using scanning electron microscopy, EDS spectroscopy, and Fourier infrared analysis. Results show that flame-retardant ADCP can effectively promote the formation of a porous carbon layer on the combustion surface of PA66. Nano-silica easily migrates to the material surface to improve the oxidation resistance of the carbon layer and the density of the carbon layer’s structure. It can also effectively prevent heat, flammable gases, and oxygen from entering the flame zone and enhance the flame retardant properties of ADCP.

scholarly journals Adjoint-based sensitivity analysis of char combustion surface reaction kinetics

Fuel ◽  
2021 ◽  
Vol 287 ◽  
pp. 119503
Author(s):  
Ahmed Hassan ◽  
Taraneh Sayadi ◽  
Martin Schiemann ◽  
Viktor Scherer
Keyword(s):  
Sensitivity Analysis ◽  
Reaction Kinetics ◽  
Surface Reaction ◽  
Combustion Surface ◽  
Char Combustion ◽  
Surface Reaction Kinetics

Laws governing the effect of lead-copper catalysts on the combustion rate of a ballistic powder

1976 ◽  
Vol 12 (5) ◽  
pp. 698-700 ◽  
Author(s):  
A. S. Androsov ◽  
A. P. Denisyuk ◽  
N. P. Tokarev
Keyword(s):  
Combustion Rate ◽  
Copper Catalysts ◽  
Ballistic Powder

Coalescence of powdered aluminum particles on combustion surface of metallized compositions

1977 ◽  
Vol 13 (5) ◽  
pp. 596-600 ◽  
Author(s):  
V. D. Gladun ◽  
Yu. V. Frolov ◽  
L. Ya. Kashporov
Keyword(s):  
Combustion Surface ◽  
Aluminum Particles ◽  
Powdered Aluminum

Three characteristic ballistic powder combustion modes with a pressure drop

1977 ◽  
Vol 13 (1) ◽  
pp. 11-14 ◽  
Author(s):  
V. I. Zemskikh ◽  
A. G. Istratov ◽  
O. I. Leipunskii ◽  
V. N. Marshakov
Keyword(s):  
Pressure Drop ◽  
Combustion Modes ◽  
Ballistic Powder ◽  
Powder Combustion

scholarly journals Impact of the Surface Morphology on the Combustion of Simulated Solid Rocket Motor

2015 ◽  
Vol 2015 ◽  
pp. 1-11
Author(s):  
Abdelkarim M. Hegab ◽  
Hani Hussain Sait ◽  
Ahmad Hussain
Keyword(s):  
Flow Field ◽  
Surface Morphology ◽  
Aluminum Powder ◽  
Combustion Surface ◽  
Rocket Motor ◽  
Solid Rocket Motor ◽  
Resonance Frequencies ◽  
Wide Range ◽  
Solid Rocket ◽  
The Impact

An advanced and intensive computational solution development is integrated with an asymptotic technique, to examine the impact of the combustion surface morphology on the generated rotational flow field in a solid rocket chamber with wide ranges of forcing frequencies. The simulated rectangular chamber is closed at one end and is open at the aft end. The upper and lower walls are permeable to allow steady and unsteady injected air to generate internal flow mimicking the flow field of the combustion gases in real rocket chamber. The frequencies of the unsteady injected flow are chosen to be very close or away from the resonance frequencies of the adapted chamber. The current study accounts for a wide range of wave numbers that reflect the complexity of real burning processes. Detailed derivation for Navier-Stokes equations at the four boundaries of the chamber is introduced in the current study. Qualitative comparison is performed with recent experimental work carried out on a two-inch hybrid rocket motor using a mixture of polyethylene and aluminum powder. The higher the percentage of aluminum powder in the mixture, the more the corrugations of the combustion surface. This trend is almost similar to the computational and analytical results of a simulated solid rocket chamber.

scholarly journals Controlling changes in the combustion surface of solid fuel charges through the use of heat-conducting elements

2021 ◽  
pp. 67-75
Author(s):  
S. K. Saveliev ◽  
D. K. Shcheglov
Keyword(s):  
Experimental Data ◽  
Thermal Diffusivity ◽  
Melting Point ◽  
Combustion Rate ◽  
Regression Models ◽  
Combustion Surface ◽  
Heat Conducting ◽  
Variation Range ◽  
Crystalline Forms ◽  
Condensed Systems

On the basis of experimental data on the local values of the combustion rate of condensed systems along the heat-conducting filaments placed therein, regression models were constructed to relate the value of the local combustion rate with such characteristics of heat-conducting filaments as the thermal diffusivity and melting point. The obtained regression model was used to assess a possible expansion of the variation range of the local combustion rate when using various crystalline forms of CVD diamonds as heat-conducting filaments. It was shown that a local increase in the combustion rate could exceed the baseline value by 200 times. The possibility of controlling the transformation of the combustion surface by using heat-conducting filaments with variable characteristics was confirmed.

scholarly journals Influence of air supply on coal spontaneous combustion during support withdrawal in fully mechanized coal mining and its prevention

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Xiaowen Zhang ◽  
Xihua Zhou ◽  
Gang Bai ◽  
Cheng Wang
Keyword(s):  
Spontaneous Combustion ◽  
Combustion Surface ◽  
Effect Of Temperature ◽  
Withdrawal Period ◽  
Coal Spontaneous Combustion ◽  
Hydrocarbon Gases ◽  
Working Face ◽  
Air Supply ◽  
Hydrocarbon Gas ◽  
Temperature Programmed

AbstractIt is necessary to change the air supply rate of the working face during the withdrawal of fully mechanized mining, making it important to study the oxidation characteristics of coal samples under different air supply rates. Through a self-made temperature-programmed experimental device, our focus was on studying the change laws of indicator gases released during the low-temperature (303.15–473.15 K) oxidation stage when the air supply rates of the coal samples were 0.67, 1.33, 2, 2.67, and 3.33 mL/s. The experimental results showed that the air supply increased, the concentrations of CO, C2H6, C3H8, C2H4, and C2H2 generated by the coal sample at the same temperature decreased, and the oxidation process decelerated. The initial temperatures of the four hydrocarbon gases were delayed to varying degrees with the increase in the air volume, and C2H4 was found to be more suitable as a hydrocarbon gas for the early warning of coal spontaneous combustion. Surface fitting was applied to analyze the change law of the CO generation rate under the combined effect of temperature and air supply; the change was divided into three stages. The CO concentration model at the upper corner of the working face during the withdrawal period was deduced, and comprehensive safety measures were put forward to prevent coal spontaneous combustion during the withdrawal period.

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