Download or read book Aluminum Particle Combustion in a Windowed Solid Propellant Flow Reactor written by Darrick Scott Schneider and published by . This book was released on 1998 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Experimental Investigation of the Effect of Aluminum Size and Loading on the Burning Rate of Solid Propellants Under Acceleration written by G. Burton Northam and published by . This book was released on 1969 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Study of Solid Propellant Combustion and Aluminum Particles at High Pressure written by Alexander Hillstrom and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ammonium perchlorate's burning rate as a function of pressure has an exponent break around 4000 psi where the pressure exponent becomes greater than 1. This causes AP to be highly sensitive to pressure fluctuations that can damage or destroy ammonium perchlorate composite propellant-based solid rocket motors. Studies conducted on AP at these high pressure are few and there is a lack of direct qualitative data due to the challenges posed by the high-pressure environment and optical window structural limitations. This has left the cause exponent break mechanism unknown and difficult to study. The High-Pressure Combustion Lab has built an Ultra-High Pressure Optical Chamber (UHPOC) that allows for optical measurements at these higher pressure regimes. Testing visual measurement techniques using the UHPOC and a telescope zoom lens to take detailed images of the propellant surface during the burn was conducted. Non-aluminized propellant and aluminized propellant samples were tested to observe the mechanisms of aluminum particle combustion in a propellant at high pressures and the behavior of the propellant past the exponent break region. \par At atmospheric, detailed high-speed images on the propellant surface were obtained using a high-powered lamp to light the surface brighter than the flame. At higher pressures, however, the luminosity of the flame was significantly greater than the lamp, creating shadow images of the propellant. Binder agglomerates were observed coming off the surface which increased in size and magnitude as the pressure increased. This is attributed to AP decomposition becoming the dominant burning rate mechanism which burned faster than the surrounding binder as has been observed from previous studies and numerical models. This leaves the binder only partially pyrolyzed, forming the agglomerates which detached from the surface. Aluminum particles were found to ignite at all pressures with the binder agglomerating the same amount in both aluminized and non-aluminized samples. Atmospheric tests show aluminum particles with detached flames and high-pressure tests show aluminum particles with surface flames.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Investigation of Experimental Techniques for Obtaining Particulate Behavior in Metallized Solid Propellant Combustion written by R. G. Cramer and published by . This book was released on 1984 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: A continuing investigation is being conducted to develop techniques which can be used to obtain quantitative data that can be used to relate solid rocket propellant composition and operating environment to the behavior of solid particulates within the grain port and exhaust nozzle. The techniques employed are high speed motion pictures of propellant strand burners and slab burners in a cross-flow environment, SEM analysis of post-fire residue (strand, slab, and motor), determination of D32 across the exhaust nozzle using measurements of scattered laser light, and holograms of burning propellant strands and slabs in a cross-flow environment. In addition, work has been initiated to develop automatic data retrieval methods for obtaining particle size distributions from holograms taken of the combustion of solid propellants. Actual particle size of burning aluminum particles were obtained in high speed motion pictures by using high intensity rear illumination of the burning propellants to eliminate the flame envelopes surrounding the burning particles. Measurements of diffractively scattered light were successfully made for determination of changes in D32 across a solid propellant rocket motor exhaust nozzle. However, to date, propellant composition and grain geometry have significantly limited the range of obtainable data. Two-dimensional motors have been successfully employed to obtain good quality holograms of propellant burned in a cross-flow environment. A Quantimet 720 has been used in an initial effort to obtain particle size distributions from a photograph taken of a reconstructed hologram.

Download or read book Holographic Investigation of Solid Propellant Combustion written by Albert George Butler and published by . This book was released on 1988 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effect of Composition on Combustion of Solid Propellants During a Rapid Pressure Decrease written by Carl C. Ciepluch and published by . This book was released on 1962 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nonsteady Burning and Combustion Stability of Solid Propellants written by Luigi De Luca and published by AIAA (American Institute of Aeronautics & Astronautics). This book was released on 1992 with total page 924 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Behavior of Aluminum in Solid Propellant Combustion written by and published by . This book was released on 1982 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report is concerned with achieving improved combustion of the aluminum ingredient in solid propellant. The approach is to clarify understanding of the complex detailed process exhibited by aluminum and relate them to control of propellant burning rate, combustion stability, combustion efficiency and two phase flow behavior in the motor. A series of experiments were contrived to elucidate the microscopic details of aluminum behavior and their relation to microscopic details of the propellant, and to behavior of the other propellant ingredients. (Author).

Download or read book Aluminum Combustion Modeling in Solid Propellant Environments written by J. F. Widener and published by . This book was released on 1999 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Combustion Kinetics of Aluminum Particles in Propellant Flames written by Kenneth O. Hartman and published by . This book was released on 1971* with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effect of Solid Propellant Binder on the Formation and Evolution of Aluminum Combustion Products written by and published by . This book was released on 1996 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: Novel particle collection and high speed photography techniques have been used to study the combustion behavior of an inert binder (IB) propellant and an energetic binder (EB) propellant. Both contained 18% aluminum and 37% coarse AP in order to provide very similar geometrical structures, and both propellants had essentially common burning rates. The aluminum combustion efficiency is higher and the characteristic agglomerate size is significantly smaller for the EB propellant than for the IB propellant (at 43 atm the agglomerate size, D43, was 190 micrometers for the EB propellant and 670 micrometers for the IB propellant). At 7.5 atm the characteristic roughness of the burning surface is about 300 micrometers for the EB propellant and about 800 micrometers for the IB propellant. X-ray photography and visual observations of quenching particles show that similar sized agglomerates can differ significantly in structure and aluminum content, and there is some indication of internal voids (i.e. low density). This appears to be a result of the different initial conditions that the agglomerates are exposed to when they initially form at the surface. The size distribution of fine oxide particles was not dependent on either pressure or the propellant binder (or on the size of agglomerates). The fine particle mass size distribution (i.e. the smoke) was observed to have 3 modal sizes, approx. 1, 3.5, and 7 micrometers.

Download or read book An Experimental Investigation of Possible Aluminum Additive Contributions to Unstable Combustion in Solid Rocket Propellants written by Leland A. Watermeier and published by . This book was released on 1962 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: Composite - double base rocket propellant slabs which contained different concentrations and particle sizes of aluminum were burned in a transparent-walled chamber. The chamber was exhausted to the atmosphere. The slabs were ignited in cigarette fashion and burned under ambient nitrogen pressures of 200-800 psi. Experimental runs were made under steady flow conditions and under oscillating conditions with a siren rotating over the exhaust part. Motion pictures were taken of the burning process at high framing rates. Data on droplet burning and concentrations in various regions above the propellant surfaces were obtained from individual frames of the film. (Author).

Download or read book Behavior of Aluminum in Solid Propellant Combustion written by Edward Warren Price and published by . This book was released on 1978 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Combustion Mechanisms of Bimodal and Ultra fine Aluminum in AP Solid Propellant written by A. Dokhan and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Distributed Combustion in Solid Propellants written by and published by . This book was released on 1993 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes work on a research program to quantify the effect of distributed combustion of metal particles in a Rijke burner. Under a previous contract experimental data were obtained with the Rijke burner, and a mathematical model of the burner was developed. To improve the model, the McIntosh flame model, based on large activation energy asymptotics, has been coupled to the acoustic model. Results have been compared to experimental data showing that the McIntosh transfer function is an improvement over previous models. Law's model of aluminum combustion has been modified to include the effects of multiple oxidizers and their products, oxide accumulation on the surface of the burning aluminum particle, and convection. There are no adjustable parameters in the improved aluminum combustion model, and both transport and thermodynamic properties are calculated internally. Results indicate that the modified model compares more favorably to experimental data than a simple liquid droplet model. The aluminum combustion model has also been coupled to the Rijke acoustic model. Calculations show a sensitivity to the size of the region of influence surrounding a particle and to the time lag between the particle response and the acoustic pressure. The results show reasonable agreement with available data for aluminum particles burning in the Rijke burner ... Unstable combustion, Distributed combustion, Acoustic instability.

Download or read book The Effects of Aluminum Particle Size on Aluminized Propellant Combustion written by Allan Dokhan and published by . This book was released on 2002 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: