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Book Effects of Normal Acceleration on Transient Burning rate Augmentation of an Aluminized Solid Propellant

Download or read book Effects of Normal Acceleration on Transient Burning rate Augmentation of an Aluminized Solid Propellant written by G. Burton Northam and published by . This book was released on 1972 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Instantaneous burning rate data for a polybutadiene acrylic acid propellant, containing 16 weight percent aluminum, were calculated from the pressure histories of a test motor with 96.77 sq cm of burning area and a 5.08-cm-thick propellant web. Additional acceleration tests were conducted with reduced propellant web thicknesses of 3.81, 2.54, and 1.27 cm. The metallic residue collected from the various web thickness tests was characterized by weight and shape and correlated with the instantaneous burning rate measurements. Rapid depressurization extinction tests were conducted in order that surface pitting characteristics due to localized increased burning rate could be correlated with the residue analysis and the instantaneous burning rate data. The acceleration-induced burning rate augmentation was strongly dependent on propellant distance burned, or burning time, and thus was transient in nature. The results from the extinction tests and the residue analyses indicate that the transient rate augmentation was highly dependent on local enhancement of the combustion zone heat feedback to the surface by the growth of molten residue particles on or just above the burning surface. The size, shape, and number density of molten residue particles, rather than the total residue weight, determined the acceleration-induced burning rate augmentation.

Book Experimental Study of the Response of Solid Propellant Burning Rate to the Changing of Pressure and the Measurement of Transient Burning Rate

Download or read book Experimental Study of the Response of Solid Propellant Burning Rate to the Changing of Pressure and the Measurement of Transient Burning Rate written by Zhang Wei and published by . This book was released on 1987 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Nonsteady Burning and Combustion Stability of Solid Propellants

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 Scientific and Technical Aerospace Reports

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Transient Combustion in Solid Propellant Cracks

Download or read book Transient Combustion in Solid Propellant Cracks written by and published by . This book was released on 1977 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Book Fast Reactions in Energetic Materials

Download or read book Fast Reactions in Energetic Materials written by Alexander S. Shteinberg and published by Springer Science & Business Media. This book was released on 2008-09-26 with total page 203 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern energetic materials include explosives, blasting powders, pyrotechnic m- tures and rocket propellants [1, 2]. The study of high-temperature decomposition of condensed phases of propellants and their components (liquid, solid and hybrid) is currently of special importance for the development of space-system engineering [3, 4]. To better understand the burning mechanisms (stationary, nonstationary, - steady) of composite solid propellants and their components, information about the macrokinetics of their high-temperature decomposition is required [5]. To be able to evaluate the ignition parameters and conditions of safe handling of heat-affected explosives, one needs to know the kinetic constants of their high-temperature - composition. The development of new composite solid propellants characterized by high performance characteristics (high burning rates, high thermal stability, stability to intrachamber perturbations, and other aspects) is not possible without quanti- tive data on the high-temperature decomposition of composite solid propellants and their components [6]. The same reasons have resulted in signi?cant theoretical and practical interest in the high-temperature decomposition of components of hybrid propellants. It is known that hybrid propellants have not been used very widely due to the low bu- ing (pyrolysis) rates of the polymer blocks in the combustion chambers of hybrid rocket engines. To increase the burning rates it is necessary to obtain information about their relationships to the corresponding kinetic and thermophysical prop- ties of the fuels.

Book Solid propellant Combustion Instability and the Role of Velocity Coupling

Download or read book Solid propellant Combustion Instability and the Role of Velocity Coupling written by Louis A. Povinelli and published by . This book was released on 1969 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pressure and velocity coupling effects on combustion stability in solid propellant burning.

Book Response of a Burning Solid Propellant to Pressure Waves of Finite Amplitude

Download or read book Response of a Burning Solid Propellant to Pressure Waves of Finite Amplitude written by A. L. Huebner and published by . This book was released on 1965 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shock-tube techniques were utilized to determine the response of a burning solid propellant surface to pressure perturbations of small, but finite amplitudes. This method of obtaining propellant responses is described with emphasis upon the techniques which were developed to remove undesirable temperature gradients. Other experimental techniques utilized to obtain high-frequency response pressure measurements under reproducible pressure, flow, and temperature conditions are described. The propellants include those (both aluminized and nonaluminized) with a wide range of pressure exponents as well as absolute burning rate. All of these experiments were conducted at about 400 psia ambient pressure. A discussion of the treatment of the experimental data to obtain Fourier transforms and the propellant response as a function of frequency is presented, with particular emphasis upon the significance and reproducibility of the data. (Author).

Book The Response of a Burning Solid Propellant Surface to Thermal Radiation

Download or read book The Response of a Burning Solid Propellant Surface to Thermal Radiation written by C. Max Mihlfeith and published by . This book was released on 1971 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new technique for the study of processes related to propellant combustion instability has been employed in which burning rate variations produced by a periodic radiant heat flux are measured. The phase angle between the perturbing flux and the burning rate response and the dependence of the magnitude of the response on the driving frequency are obtained. As the frequency of the perturbing flux increases, magnitude of the reaction is observed to first increase and then to pass through a maximum. In general, the experimental results tend to confirm the theoretical models for transient burning rate response, although the observed maximums in the response functions appear to occur at higher frequencies than is predicted by the simpler gas-phase models. (Author).

Book Proceedings of the Meeting Technical Panel on Solid Propellant Combustion Instability 4th Held at Stanford Research Institute Menlo Park Calif February 1 1964

Download or read book Proceedings of the Meeting Technical Panel on Solid Propellant Combustion Instability 4th Held at Stanford Research Institute Menlo Park Calif February 1 1964 written by JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB. and published by . This book was released on 1964 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt: The paper, Experimental measurements of acoustic erosivity effects on propellant burning rates, by R.C. Strittmater, W.P. Aungst, C.E. Thompson and L.A. Watermeier, is given in its entirety. In addition, condensed versions of the following papers are included: Problems in liquid propellant instability; Liquid instability problems; An experimental study of solid propellant combustion instability in a standing wave tube; Basic physical processes of solid propellant combustion; Shock wave -- burning solid propellant interaction; Acoustic absorption coefficients of the combustion products of aluminized propellants; Further development of 'Stability grading of solid propellants by the oscillatory strand burner test'; An interpretive study of unstable rocket combustion data and method for the simulation of such data; Work at Summerfield Research Station and the University of Sheffield, England; Influence of compositional factors on axial instability; Influence of axial combustion instability on the development of a 23KS20000 motor; Progress in research on combustion instability of solid propellants at the University of Utah; Low frequency acoustic instability studies with double base propellants; Bulk compressibility of solid propellants; Solution of transient vibration problems by separation of variables.

Book Measurement of Steady State and Transient Solid Propellant Burning Rates with Microwaves

Download or read book Measurement of Steady State and Transient Solid Propellant Burning Rates with Microwaves written by Alexandros C. Alkidas and published by . This book was released on 1973 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: A microwave continuous measurement technique has been utilized to measure burning rates of a CTPB and AP composite solid propellant during steady state and rapid decompression. A microwave signal oscillating at a known source frequency is passed through the end of a burning propellant strand opposite the burning surface and allowed to reflect off the burning surface which is receding at some unknown velocity. By continuously comparing the phse angle of this reflected signal with the phase angle of another signal oscillating at the original source frequency, a relative phase angle between the two signals is obtained. The rate of change of this relative phase angle with time is proportional to the propellant's burning rate. Accurate (plus or minus 10 percent) continuous burning rate data was obtained and shown to be within capabilities of the system for dP/dt values less than about 2500 psi/second. (Modified author abstract).