Flame Propagation in Propellant Cracks PDF Download
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Author: Charles E. Payne
Publisher:
ISBN:
Category :
Languages : en
Pages : 19
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Book Description
This is a report of work relating to the spread of solid propellant flames into cracks present in the propellant surface. The tests were performed in a no-flow environment within a high-pressure, windowed combustion bomb. Data were all recorded by high-speed motion picture camera and all test conditions were identical -- 700 psia, and ambient initial propellant temperature. Test results point to no lower minimum crack width which will exclude flame penetration. The time required for flame entry into cracks decreases with decreasing crack width and propagation rates within a crack increase as crack width decreases. (Author).
Author: Charles E. Payne
Publisher:
ISBN:
Category :
Languages : en
Pages : 19
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Book Description
This is a report of work relating to the spread of solid propellant flames into cracks present in the propellant surface. The tests were performed in a no-flow environment within a high-pressure, windowed combustion bomb. Data were all recorded by high-speed motion picture camera and all test conditions were identical -- 700 psia, and ambient initial propellant temperature. Test results point to no lower minimum crack width which will exclude flame penetration. The time required for flame entry into cracks decreases with decreasing crack width and propagation rates within a crack increase as crack width decreases. (Author).
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 50
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Book Description
A one-dimensional theoretical model, incorporating the Noble-Abel dense gas law, has been developed to describe the transient model combustion phenomena inside a propellant crack. The theoretical model can be used to predict wave phenomena, heat transfer from the gas to the propellant surface and associated thermal penetration, flame propagation, and resultant pressurization at various locations along the propellant cavity. Calculations made with the current theoretical model revealed that the internal pressurization rate, pressure gradient, and flame velocity in propellant cracks (for which gases can penetrate) decrease as: the gap width increases, the rocket chamber pressurization rate decreases, and the propellant gasification temperature increases. Additionally, the predicted flame spreading was found to decelerate in a region near the crack tip; this phenomena has been experimentally observed by others.
Author: Jerald L. Cunningham
Publisher:
ISBN:
Category :
Languages : en
Pages : 173
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Book Description
An experimental study was conducted to investigate the spread of combustion flames into solid rocket propellant cracks. Experiments were performed using a combustion vessel with a free flowing nitrogen atmosphere under pressures of 300, 500, and 750 psig. Samples of three different propellants having crack widths varying from 0.022 in to 0.044 in were used. The ignition of the samples and the flame spread were recorded with a high-speed motion camera. Tests showed that the flame velocity inside the crack channels increased as the crack width decreased, and an entrance delay time usually exists prior to the flame entering the crack channel. For the range of crack widths investigated, no crack width was found for which flame penetration did not occur. Crack width demonstrated a greater effect on flame spread velocity in the crack than combustion pressure. The flame velocity flow inside a crack as a function of pressure and crack size is unique for each propellant tested.
Author: Jerald Lane Cunningham (CAPT, USAF.)
Publisher:
ISBN:
Category : Flame
Languages : en
Pages :
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Book Description
Author: Martin Summerfield
Publisher: AIAA
ISBN: 9781600863967
Category : Solid propellants
Languages : en
Pages : 922
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Book Description
Author: Mridul Kumar
Publisher:
ISBN:
Category : Combustion
Languages : en
Pages : 196
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Book Description
Author: T. Godai
Publisher:
ISBN:
Category : Ammonium perchlorate
Languages : en
Pages : 9
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Book Description
The flame propagation into a narrow gap, which is prepared perpendicular to the prime burning surface of solid propellant grain, has been experimentally investigated using the test specimens of polyester-ammonium perchlorate composite propellants. Experimental results show that the flame propagates from the original burning surface into a gap when its width is larger than some critical value, and vice versa. This means that there always exists the critical value for the width of gap which is the threshold of propagation and nonpropagation of flame into it. The critical value is primarily the function of linear burning rate and the over-all mechanism of flame propagation into a gap of solid propellant grain will be explained with the quenching theorem. It is expected that further work will give a useful measure to the setting of standards of nondestructive testing of solid propellant grains and motors -- Author.
Author: REDSTONE SCIENTIFIC INFORMATION CENTER REDSTONE ARSENAL AL TRANSLATION BRANCH.
Publisher:
ISBN:
Category :
Languages : en
Pages : 16
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Book Description
The flame propagation into a narrow gap, which is prepared perpendicular to the prime burning surface of solid propellant grain, has been experimentally investigated using the test specimens of polyester-ammonium perchlorate composite propellants. Experimental results show that the flame propagates from the original burning surface into a gap when its width is larger than some critical value, and vice versa. This means that there always exists the critical value for the width of gap which is the threshold of propagation and nonpropagation of flame into it. The critical value is primarily the function of linear burning rate and the over-all mechanism of flame propagation into a gap of solid propellant grain will be explained with the quenching theorem. It is expected that further work will give a useful measure to the setting of standards of nondestructive testing of solid propellant grains and motors. (Author).
Author: Kenneth K. Kuo
Publisher:
ISBN:
Category :
Languages : en
Pages : 116
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Book Description
Three major tasks performed during the report period of investigation were: i) crack propagation and branching in burning solid propellants, ii) ignition of nitramine-based composite propellants under rapid pressurization, and iii) ignition of nitramine-based composite propellants by CO2 laser. Propellant samples have been recovered by interrupted burning experiments. Four modes of crack propagation and/or branching were observed. The amount of surface area generated by mixed or branched modes is substantially higher than that of the single crack propagation mode, and thus could cause sufficiently severe burning in the damaged zone to result in rocket motor failure. The crack propagation problem is analyzed through the use of basic physical principles, experimental results, and Schaper's theory of crack propagation. A set of governing dimensionless parameters which control and characterize the degree of damage has been obtained. These parameters can be used to develop guidelines for safe operating conditions of rocket motors. Ignition characteristics of a series of RDX-based composite propellants were studied. The times for the onset of light emission (t sub LE) of different propellants under rapid pressurization were compared. It is also found that propellant samples with shorter t sub LE do not necessarily show higher mass consumption, this indicates that propellant vulnerabilty should be evaluated by both t sub LE and the fraction of mass consumed.
Author:
Publisher:
ISBN:
Category : Acoustic phenomena in nature
Languages : en
Pages : 1126
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Book Description
