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Experimental Study Of The Burning Rates Of Some Solid Propellants By Using A Closed Bomb
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Book Synopsis Experimental Study of the Burning Rates of Some Solid Propellants by Using a Closed Bomb by : H. L. H. Collins
Download or read book Experimental Study of the Burning Rates of Some Solid Propellants by Using a Closed Bomb written by H. L. H. Collins and published by . This book was released on 1947 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Solid Propellant Burning Rate Measurement in a Closed Bomb by :
Download or read book Solid Propellant Burning Rate Measurement in a Closed Bomb written by and published by . This book was released on 1975 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments show that the burning rate of solid propellants is a function of the pressure under which the burning takes place. An often used method to determine that burning rate function is to burn a sample of the propellant in a closed container and to register the corresponding pressure-time data. With the aid of formulas from thermodynamic theory these observations can be manipulated to yield the desired parameters of the burning rate function. This analysis is typically done under a number of restrictive assumptions, e.g., the assumption of constant temperature in the container throughout the experiment. In spite of such assumptions the corresponding algorithms published are complicated and an error analysis of the results has apparently never been reported. In the present paper new formulas are derived under relaxed assumptions. With the aid of these formulas the data analysis is reduced to a curve fitting task. For such tasks standard theories and computer programs are available, which furnish the unknown parameters of the burning rate function together with estimates of their variances and co-variances. The new formulas can be replaced by simpler ones under conditions, which are controllable by the design of the experiment. It is found that for such simplifications the temperature's behavior is not relevant. In general the simplifications are permissible if the maximum pressure achieved during the experiment remains essentially smaller than the chemical energy released per unit volume of the propellant. The latter is typically of the order of 10 to 10th power Pa (10 to 5th power). An example illustrates the application of the new algorithm.
Book Synopsis An Optical Bomb Study of the Combustion of Solid Propellants in High Acceleration Fields by : Merrill K. King
Download or read book An Optical Bomb Study of the Combustion of Solid Propellants in High Acceleration Fields written by Merrill K. King and published by . This book was released on 1968 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental study of the effects of acceleration fields on the burning rate of solid propellant grains is being conducted. A variety of formulations are being studied over a range of pressures and acceleration loadings; the results will eventually be used to evaluate theoretical models of the process or to form the basis for improved models. The acceleration vector, produced by spinning a disc-shaped propellant in a large volume optical bomb, can be directed perpendicularly into or away from the burning surface. Three formulations have been studied to date under both vector orientations. (Author).
Book Synopsis Burning Rate Mechanisms of Solid Propellants by : F. Lillo
Download or read book Burning Rate Mechanisms of Solid Propellants written by F. Lillo and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Solid propellant burning rate measurement in a closed bomb by : Alvars Celmins
Download or read book Solid propellant burning rate measurement in a closed bomb written by Alvars Celmins and published by . This book was released on 1975 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Study of Solid Propellant Deflagration Using High Speed Motion Pictures and Postfire Residue Analysis by : Vincent Daniel DiLoreto
Download or read book An Experimental Study of Solid Propellant Deflagration Using High Speed Motion Pictures and Postfire Residue Analysis written by Vincent Daniel DiLoreto and published by . This book was released on 1980 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt: Six aluminized propellants were investigated through strand burning in a windowed combustion bomb at 500 psi and 1000 psi. Postfire particle residues were analyzed with a scanning electron microscope and found to have bi-modal size distributions. The mean diameter of the fine particle distribution was approximately 10 microns in all cases while the mean diameter of the coarse particles was approximately the same size as the initial aluminum cast in the propellant. Measurements taken from the high speed motion pictures included resolution, propellant burning rate, the diameter of the burning particles ejected from the surface, and vertical velocity of burning particles. The diameters of burning particles were approximately 7 to 12 times the diameter of the initial aluminum cast in the propellant. Aluminum size had only small effects on burning rate. The smallest particle that could be accurately resolved with the motion pictures was approximately 60 microns. (Author).
Book Synopsis A Study of the Burning Rates of Composite Solid Propellants in Acceleration Fields by : Edward John Sturm
Download or read book A Study of the Burning Rates of Composite Solid Propellants in Acceleration Fields written by Edward John Sturm and published by . This book was released on 1968 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: The average burning rates of a series of composite solid propellants were measured in acceleration fields up to 1000 G using a combustion bomb mounted on a centrifuge. The propellants were burned at constant pressures of 500, 1000, and 1500 psia. Specially prepared motors allowed the study of the effect of simultaneous erosive and acceleration induced burning rate increases. The burning rates of both the non-metallized and the majority of the metallized propellants were found to depend on acceleration. The effect of acceleration was found to depend on the basic burning rates of the propellants and the aluminum and oxidizer particle sizes and weight percentages. The burning rates of two very fast burning rate propellants were found to be essentially independent of acceleration. The erosion sensitivity of a propellant was found to decrease with increasing acceleration. A model was developed which successfully correlates the experimental results obtained for the non-metallized propellants. The experimental results for the metallized propellants could not be correlated by either of two models proposed by other investigators. This result indicates that a more complex model is required to explain the observed acceleration effects for metallized propellants. (Author).
Book Synopsis Experimental Studies of Composite Solid Propellant Combustion Mechanism- Burning Surface Photomacroscopy and Low Pressure Burning Rates by : Richard B. Cole
Download or read book Experimental Studies of Composite Solid Propellant Combustion Mechanism- Burning Surface Photomacroscopy and Low Pressure Burning Rates written by Richard B. Cole and published by . This book was released on 1966 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analysis of Burning Rate Phenomena and Extinguished Solid Propellants from an Interrupted Closed Bomb with Plasma Igniter by : Robert J. Lieb
Download or read book Analysis of Burning Rate Phenomena and Extinguished Solid Propellants from an Interrupted Closed Bomb with Plasma Igniter written by Robert J. Lieb and published by . This book was released on 2001 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Closed-Bomb Combustion of Hivelite-Based, Very High Burn Rate (VHBR) Propellant by : E. B. Fisher
Download or read book Closed-Bomb Combustion of Hivelite-Based, Very High Burn Rate (VHBR) Propellant written by E. B. Fisher and published by . This book was released on 1985 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation of the combustion characteristics of a Hivelite-based, very-high-burn-rate (VHBR) propellant was conducted. The experiments were performed in a closed chamber, called the VHBR bomb, that was specially designed and constructed for these experiments. The device was designed with the same diameter as the propellant samples in order to maintain one dimensional combustion processes and transient wave phenomena to simplify subsequent interpretation and analysis. Propellant combustion was characterized by a low burn rate (about 1 m/s) until a pressure in the vicinity of 15-20 MPa is reached. After this pressure, which may represent the propellant crushing or break pressure, the combustion rate accelerated to levels from 10 to 180 m/s, depending on other test parameters. Tests conducted at different loading densities indicated that combustion rate was a strong function of pressure. Variation of sample weight at constant loading density demonstrated that increasing the amount of unburned propellant at the time the break pressure was reached also causes burn rate and thrust to increase. A coating that makes the outside surface of the sample slippery tended to reduce the apparent burn rate but use of a coating which retarded transmission of gas pressure along the periphery of the sample increased the apparent burn rate as well as thrust. Change of mounting interface properties caused significant differences in the dynamic characteristics leading to increased thrust.
Book Synopsis Experimental Diagnostics in Combustion of Solids by : Thomas L. Boggs
Download or read book Experimental Diagnostics in Combustion of Solids written by Thomas L. Boggs and published by . This book was released on 1978 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Study of Combustion in Solid Propellants and in Gaseous Systems by : A. Van Tiggelen
Download or read book Experimental Study of Combustion in Solid Propellants and in Gaseous Systems written by A. Van Tiggelen and published by . This book was released on 1969 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Applying the technique of the analogical burner (multimicrojet burner) it is possible to measure the heat transferred from the burning zone to the surface of the burner which plays the role of the regressing surface of a burning solid propellant. The study has been achieved in two extreme cases of burning conditions: fully individual premixed flamelets and purely individual diffusion flamelets. The burning mixture consisted of methane, oxygen and nitrogen. A theoretical interpretation is given to the experimental data. The second part of this report consists in an introduction to the comparative study of chemiluminescence and chemiionization in flames propagating in the most varied mixtures of gaseous fuels and oxidizers. (Author).
Book Synopsis Round Robin Results of the Closed Bomb and Strand Burner by : Arpad A. Juhasz
Download or read book Round Robin Results of the Closed Bomb and Strand Burner written by Arpad A. Juhasz and published by . This book was released on 1982 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of exercises was undertaken by participants from the three services, private industry, and academia to assess the comparability of propellant burning rate data among installations. The study involved both the closed bomb and high pressure strand burner techniques. Identical propellant formulations were distributed to the participants, burned, and the data converted to burning rates using methods prevailing at each installation. In some cases closed bomb as well as strand burner results showed excellent agreement (to + or - 2.5 percent on the average and to within + or - 1 percent mid-range). In less favorable cases closed bomb burning rates from different installations exhibited two or three times as much scatter. In one case there were significant differences between closed bomb and strand burner data. For the closed bomb data, variations could be linked to experimental factors such as loading density, sample quickness, and ignition parameters, as well as post-acquisition data manipulation techniques such as smoothing and differentiation. (Author).
Download or read book Research Paper written by and published by . This book was released on 1966 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Improved Method for the Measurement of Solid Propellant Strand-burning Rates in Closed Bombs by : D. H. Stewart
Download or read book An Improved Method for the Measurement of Solid Propellant Strand-burning Rates in Closed Bombs written by D. H. Stewart and published by . This book was released on 1963 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new method for determining propelland strand burning rates without the use of timing wires has been developed. It was found that when the cross-sectional area of the strand is sharply varied at known intervals, the burning rate can be obtained from assessment of the resulting pressure-time trace. Results of the new method are within 1% of the standard wire technique. The method is applicable to ''difficult'' propellant systems and offers advantages of lower cost, higher reliability, and safety. (Author).
Book Synopsis Electrothermal-chemical (ETC) Closed-chamber Interrupted-burning Tests with JA2 and M30 Solid Propellants by :
Download or read book Electrothermal-chemical (ETC) Closed-chamber Interrupted-burning Tests with JA2 and M30 Solid Propellants written by and published by . This book was released on 2000 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interrupted- and noninterrupted-burning tests were conducted with cylindrical perforated grains of JA2 and M30 in a closed bomb with a loading density of approximately 0.2 g/cu cm. Both conventional black-powder and plasma igniters were used. The plasma igniter was an ablating capillary, and the electrical energy density was about 0.7 kJ/g of propellant. The diameters of the collected grains yielded the actual burn distance at the time of the interrupted burning. The experimental pressure traces and the conventional burn-rate coefficients of the propellants were used to calculate the theoretical depth burned assuming no plasma-induced burn-rate modifications. Overlapping pressure traces at several interrupted pressures and from comparison to the calculated-versus-measured burn distances indicated that there is burn-rate enhancement during the plasma pulse, but not much once the pulse has ended. In contrast to the JA2 burn rates, both ambient and cold ( -20 deg C) M30 burn rates, deduced from the noninterrupted tests using the BRLCB code, were enhanced even after the plasma turn-off, thus contradicting the interrupted test results. However, vivacity analysis of the noninterrupted tests indicated that the M30 grains exhibited increased surface area (possible fragmentation) because of the plasma interaction, an effect that would cause erroneous results from the BRLCB. Indeed, simulating the noninterrupted M30 tests using the XNOVAKTC code and assuming partial fragmentation of the propellant charge yielded vivacities that mimicked the experimental ones.
Book Synopsis Publications of the Jet Propulsion Laboratory, January 1938 Through June 1961 by : D. K. Walsh
Download or read book Publications of the Jet Propulsion Laboratory, January 1938 Through June 1961 written by D. K. Walsh and published by . This book was released on 1961 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt:
