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Burning Rates Of Standard Army Propellants In Strand Burner And Closed Chamber Tests
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Book Synopsis Burning Rates of Standard Army Propellants in Strand Burner and Closed Chamber Tests by :
Download or read book Burning Rates of Standard Army Propellants in Strand Burner and Closed Chamber Tests written by and published by . This book was released on 1977 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: Burning rate data determined over twenty years ago at the Ballistic Research Laboratory (BRL) and disseminated to only a limited audience have been referenced in several recent reports. This report provides a complete compilation of the experiments, the data, and the analyses to provide a usable reference for current investigations. It compares strand burner and closed chamber rates for the same propellant. Standard army gun propellants (M1, M2, M5, M6, M8, M10, and M17) were re-extruded into 3mm (1/8 in.) and 6mm (1/4 in.) strands for strand burner tests at pressures of 3.4 to 310 MPa (500 to 45,000 psi) and in closed chamber tests at densities of loading (delta) of 0.089, 0. 174, and 0.258 g/cc. Fifteen additional lots of standard propellants were tested in the closed chamber at densities of loading of 0.084 and 0.140 g/cc. The report presents the raw data, method of calculation for burning rate, and coefficients for various burning rate equations. The report also proposes an empirical relationship between the propellant flame temperature, and the burning rate parameters.
Book Synopsis Burning Rates of Standard Army Propellants in Strand Burner and Closed Chamber Tests by : Bertram B. Grollman
Download or read book Burning Rates of Standard Army Propellants in Strand Burner and Closed Chamber Tests written by Bertram B. Grollman and published by . This book was released on 1977 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Burning Rate Behavior of Pure Nitrocellulose Propellant Samples by : Frederick W. Robbins
Download or read book The Burning Rate Behavior of Pure Nitrocellulose Propellant Samples written by Frederick W. Robbins and published by . This book was released on 1993 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1988 with total page 968 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book חבור קראי בקבלה (קטע) written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Simulation of Closed Chamber Burning of Very-High Rate Propellant by : Paul G. Baer
Download or read book Simulation of Closed Chamber Burning of Very-High Rate Propellant written by Paul G. Baer and published by . This book was released on 1988 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: Closed chamber firings of very-high burning rate (VHBR) propellants have been conducted at the Ballistic Research Laboratory as part of the traveling charge gun program. Using standard closed chamber data reduction techniques, burning rates in the range of 10 to 300 m/s over a pressure range of 50 to 300 MPa have been measured. Pressure-time records from the firings of VHBR propellants exhibit severe pressure wave phenomena which are removed by digital filtering prior to transformation to burning rate data. Burning rate data for four VHBR propellants were used in a 1-D traveling charge code set up to simulate VHBR propellant being fired in a closed chamber. Objectives were to check consistency of the data, obtain better estimates of the data, obtain an understanding of the gas dynamic phenomena occurring in the chamber, and assess the validity of simulations produced by the 1-D traveling charge gun code. The procedure used was to match simulated data to experimental pressure-time data and adjust the burning rate data until the two curves matched. It is concluded that consistency of burning rate data in excess of 35 m/s over the pressure range of 50-150 MPa is poor. High amplitude pressure waves in the chamber create severe errors in the derived propellant burning rates.
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).
Book Synopsis 16th JANNAF Combustion Meeting, Naval Postgraduate School, Monterey, California, September 10-14, 1979: DDT and gun propellants (unclassified by :
Download or read book 16th JANNAF Combustion Meeting, Naval Postgraduate School, Monterey, California, September 10-14, 1979: DDT and gun propellants (unclassified written by and published by . This book was released on 1979 with total page 772 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Intelligent Manufacturing & Mechatronics by : Mohd Hasnun Arif Hassan
Download or read book Intelligent Manufacturing & Mechatronics written by Mohd Hasnun Arif Hassan and published by Springer. This book was released on 2018-04-27 with total page 705 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the proceedings of SympoSIMM 2018, the 1st edition of the Symposium on Intelligent Manufacturing and Mechatronics. With the theme of “Strengthening Innovations Towards Industry 4.0”, the book comprises the studies towards the particularity of Industry 4.0’s current trends. It is divided into five parts covering various scopes of manufacturing engineering and mechatronics stream, namely Intelligent Manufacturing, Robotics, Artificial Intelligence, Instrumentation, and Modelling and Simulation. It is hoped that this book will benefit the readers in embracing the new era of Industrial Revolution 4.0.
Book Synopsis Nonsteady Burning and Combustion Stability of Solid Propellants by : Martin Summerfield
Download or read book Nonsteady Burning and Combustion Stability of Solid Propellants written by Martin Summerfield and published by AIAA. This book was released on 1992 with total page 922 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Improved Techniques for Measuring Thermal Effects of Propellant Burn Tests in Confined Areas by : E. C. Knox
Download or read book Improved Techniques for Measuring Thermal Effects of Propellant Burn Tests in Confined Areas written by E. C. Knox and published by . This book was released on 1996 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flame Spreading and Combustion Behavior of Gun Propellants Packed in High Loading Densities by :
Download or read book Flame Spreading and Combustion Behavior of Gun Propellants Packed in High Loading Densities written by and published by . This book was released on 2004 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: The combustion process of gun propellants packed in high loading density conditions can differ significantly from those burning individually in the same pressure and temperature environment. More specifically, burn rates and flame spreading processes for a propellant charge are not only functions of pressure and initial temperature, but also a function of the loading density (or gap width between adjacent propellants). This experimental study has been conducted to investigate the influence of gap space between propellants on propellant regression rates. In the experimental setup, two opposing strands of JA2 gun propellant were burned in a double-ended windowed strand burner (DEWSB). The DEWSB consists of two identical propellant feeding systems adjoined to a center combustion chamber. To measure the gap width between the two strands, a contrasting image between the propellant strands and the background was used. To obtain a constant gap width between the opposing propellants, an image was imported into a LabVIEW control feedback loop. A series of tests was conducted for a pressure range from 0.69 to 3.45 MPa, and a gap distance range from 2 to 12 mm. Comparing regression rate data of JA2 propellant burned in the double-end configuration to that of a single strand, an increase in the regression rate of about 30% was observed for the pressure range tested. This increase occurs for a certain gap width range, which was found to be a function of pressure. The enhancement of the burn rate is caused by the geometric confinement of the flame, which applies a greater energy feedback to the burning propellant surface.
Download or read book AIAA 90-1835 - AIAA 90-1881 written by and published by . This book was released on 1990 with total page 352 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 CYCLOPS, A Breakthrough Code to Predict Solid-Propellant Burning Rates by : Martin S. Miller
Download or read book CYCLOPS, A Breakthrough Code to Predict Solid-Propellant Burning Rates written by Martin S. Miller and published by . This book was released on 2003-02 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Theoretical capability to predict the burning rate of real propellants from their ingredients would be an invaluable aid to formulating new propellants. Despite progress over the last decade on a very few simple ingredients, such as cyclotrimethylenetrintramine (RDX), and a few simple binary mixtures, no general capability of this sort exists today. This shortcoming is not due to insufficient computational resources, but to a lack of understanding of fundamental combustion mechanisms in the condensed phase and surface(gas interlace for typical propellant ingredients and their mixtures. This difficult problem is likely to remain intractable for some time to come. In this report, we demonstrate that our previously published semi-empirical formalism for single ingredients can be success fully extended to treat multi-ingredient propellants. In particular, for purposes of this report, we confine ourselves to nitrate- ester propellants, using MlO, M2, M9, and JA2 as examples. However, the method should also be applicable to other classes of homogeneous propellants and even composite propellants where mixing of ingredients in a surface melt layer or sufficiently small particle sizes remove the multi- dimensional character. The method treats the gas-phase processes on the level of elementary reaction and multicomponent transport. A semi-empirical pyrolysis law coupled with informed estimates of the decomposition products of the condensed phase enables us to finesse the absence of knowledge of the detailed processes occurring in the condensed phase and at the burning surface. Results of a computer code, CYCLOPS, based on this approach, show that both the burning rate and flame structure are well predicted for a series of four U. S. Army gun propellants.
Book Synopsis Burning Velocities of a Solid Propellant, Via a Microwave Technique, at Elevated Pressures and Pressurization Rates by : Lisle Hoaglund Russell
Download or read book Burning Velocities of a Solid Propellant, Via a Microwave Technique, at Elevated Pressures and Pressurization Rates written by Lisle Hoaglund Russell and published by . This book was released on 1979 with total page 269 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presented are the results of a research effort to directly measure, via a microwave Doppler/phase shift technique, the burning rate of solid propellant in both steady and dynamic elevated pressure environments. The recession velocity of the propellant when it burned planarly within a small rectangular waveguide was directly proportional to the time rate of change of a measured relative phase angle. This relative phase angle was based upon the phase relationship between guided microwave reflections from two surfaces, one a reference plane and the other an effective plane created by the dielectric discontinuity at the burning propellant surface. In the pressure range from 500 t0 10,000 psig, steady-state burning rate tests with a single base nitrocellulose gun propellant, M6, were sucessfully conducted in a large volume combustion fixture which incorporated a coaxial-to-waveguide adapter having unique pressure sealing microwave feedthroughs. in addition to yielding burning rate values intermediate to those from conventional closed chamber and strand burner tests, the experiments established the uncertainty in the proportionality constant linking M6 burning rate and the time derivative of relative phase angle. A one-dimensional theoretical model was formulated and, with the aid of appropriately chosen constants, yielded predictions which agreed very well with the experimentally observed behavior of a solid propellant undergoing planar burning with a waveguide.
Book Synopsis Burn-Rate Investigations of HAN-Based Candidate Liquid Propellants by :
Download or read book Burn-Rate Investigations of HAN-Based Candidate Liquid Propellants written by and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: High-pressure windowed strand burners have been used to obtain burning rates for some hydroxyl ammonium nitrate (HAN) liquid propellants over the pressure range from about 10 to 300 MPa. Measured linear burn rates for these liquids were erratic due to the manifestation of surface irregularities. This burning surface variable has been minimized by gelling. A pressure break occurs around 80 MPa for these gelled propellants. The burn rate (r) vs. pressure (p) can be adequately expressed by an exponential of the form r = Ap(exp n). For pressures below 70 MPa, n 0.2, and for pressures between 70 and 300 MPa, n 1.1. One HAN-based liquid propellant, XM46, has been investigated as a function of temperature as well. Due to the substantial increase in viscosity, cold-temperature ( -50 deg C) burn rates were obtained without the use of any gelling agent These cold temperature burn rates are slightly lower than the ambient temperature rates and follow a similar pressure behavior at pressures above about 30 MPa. Hot-temperature (+60 deg C) gelled XM46 burn rates are slightly larger than the ambient-temperature rates, again with a similar pressure behavior. Burn rates were also determined for gelled 9.1 M HAN through the 70-MPa pressure region, but no convincing evidence of a similar pressure break was observed.
