Topic
Burn rate (chemistry)
About: Burn rate (chemistry) is a research topic. Over the lifetime, 847 publications have been published within this topic receiving 8908 citations. The topic is also known as: Burning rate.
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13 Jun 1966
TL;DR: In this article, the effect of solid propellant combustion upon pressure perturbations arising in a rocket chamber is provided by the response function of the burning surface of a burning surface.
Abstract: : A measure of the effect of solid propellant combustion upon pressure perturbations arising in a rocket chamber is provided by the response function of the burning surface. Conventional methods of measuring this quantity are based upon a number of assumptions which are doubtful; further, they require a large number of tests for characterization of propellant response with frequency. A shock-tube method, free from some of these objections, was utilized to determine the response of a burning solid propellant surface to pressure perturbations of small but finite amplitude. The theory, experimental details, and treatment of the data are described briefly. Results are reported for several propellant formulations, including different aluminum loadings. These results are compared with empirical instability data and with theory. A critique of the shock-tube and other methods of measuring propellant response is presented in terms of effects found to be important during the course of the program. (Author)
1 citations
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01 Jun 1986
TL;DR: The use of high-energy gas fracturing (HEGF) is a tailored-pulse fracturing technique originally developed by Sandia National Laboratories for application in uncased, liquid-free gas wells in Appalachian Devonian shales as mentioned in this paper.
Abstract: A propellant-based technology, High-Energy Gas Fracturing (HEGF), has been applied to fracturing through perforations in cased boreholes. HEGF is a tailored-pulse fracturing technique originally developed by Sandia National Laboratories for application in uncased, liquid-free gas wells in Appalachian Devonian shales. Because most oil and gas wells are liquid filled as well as cased and perforated, the potential impact of present research is significantly broader. A number of commercial tailored-pulse fracturing services, using a variety of explosives or propellants, are currently available. Present research provides valuable insight into phenomena that occur in those stimulations. The use of propellants that deflagrate or burn rather than detonate, as do high-order explosives, permits controlled buildup of pressure in the wellbore. The key to successful stimulation in cased and perforated wellbores is to control the pressure buildup of the combustion gases to maximize fracturing without destroying the casing. Eight experiments using cased and perforated wellbore were conducted in a tunnel complex at the Department of Energy's Nevada Test Site, which provides a realistic in situ stress environment (4 to 10 MPa (600 to 1500 psi)) and provides access for mineback to directly observe fracturing obtained. Primary variables in the experiments include propellant burn rate andmore » amount of propellant used, presence or absence of liquid in the wellbore, in situ stress orientation, and perforation diameter, density, and phasing. In general, the presence of liquid in the borehole results in a much faster pressure risetime and a lower peak pressure for the same propellant charge. Fracture surfaces proceed outward along lines of perforations as determined by phasing, then gradually turn toward the hydraulic fracture direction. 8 refs., 23 figs., 3 tabs.« less
1 citations
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04 Sep 2017TL;DR: In this paper, the transient phase of catalyst heating on a high-performance turbocharged spark ignition engine with the aim to accurately predict the exhaust thermal energy available at the catalyst inlet and to provide a "virtual test rig" to assess different design and calibration options.
Abstract: This paper presents the modeling of the transient phase of catalyst heating on a high-performance turbocharged spark ignition engine with the aim to accurately predict the exhaust thermal energy available at the catalyst inlet and to provide a "virtual test rig" to assess different design and calibration options.The entire transient phase, starting from the engine cranking until the catalyst warm-up is completed, was taken into account in the simulation, and the model was validated using a wide data-set of experimental tests.The first step of the modeling activity was the combustion analysis during the transient phase: the burn rate was evaluated on the basis of experimental in-cylinder pressure data, considering both cycle-to-cycle and cylinder-to-cylinder variations.Then, as far as the exhaust temperatures are concerned, a detailed model of the thermocouples was implemented to replicate the physical behavior of the sensors during the warm-up and to compare the simulated temperatures with the measured ones.Finally, a complete analysis of the energy balance during the transient was carried out: the thermal power available to the catalyst inlet was obtained from a complete analysis of power losses (i.e. friction and pumping losses, in-cylinder heat transfer, engine block and engine coolant heating, exhaust manifold heat transfer, etc.).In conclusion, the proposed methodology allows to reliably simulate in details the Cat-Heating transient, showing a valuable potential in driving the main design and calibration choices during the engine development process.
1 citations
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24 Jul 2000
TL;DR: In this paper, the aluminum-magnesium fuel-rich propellant for unchoked ducted rocket was developed and its combustion characteristics at low pressure (0.2 2.0 MPa) were investigated by means of strand burner and direct connected-pipe testing facility.
Abstract: The aluminum-magnesium fuel-rich propellant for unchoked ducted rocket was developed. The combustion characteristics of the fuel-rich propellant at low pressure '(0.2 2.0 MPa) was investigated by means of strand burner and direct connected-pipe testing facility.
1 citations
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03 Aug 1994TL;DR: In this article, a family of ultra-high burn rate gun propellant systems based upon a nitrocellulose binder matrix, and containing a variety of azide components to provide formulations having reduced isochoric flame temperatures and ultra high mass consumption rates.
Abstract: A family of ultra-high burn rate gun propellant systems based upon a nitrocellulose binder matrix, and containing a variety of azide components to provide formulations having reduced isochoric flame temperatures and ultra-high mass consumption rates.
1 citations