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Showing 1 to 20 of 177 for “"Detonation"”.
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Fluidic Jet Turbulence Generators for Deflagration to Detonation Transition in Pulsed Detonation Combustors
… the turbulent deflagration flame front to detonation velocity in the shortest possible distance while using a single Jet in Cross Flow (JICF). Jets in crossflow, depending on orientation and momentum ratio, can induce two types of flow structures that propagate downstream; vortex filaments …
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Investigations on detonation shock dynamics
A detonation is a combustion-driven shock wave. Typically, a detonation will consist of an inert shock followed by a region of chemical reaction referred to as the reaction zone. Detonations have a wide variety of engineering applications, from obvious military uses to explosive welding, hard rock …
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Ionization in seeded detonation waves
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1960.
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THERMAL MANAGEMENT OF ROTATING DETONATION ENGINES
… at NUS Temasek Laboratories regarding Rotating Detonation Engines (RDEs), a concept which has attracted considerable attention globally in recent years due to the immense academic progress on the topic and its prospective commercial viability, particularly in relation to aerospace propulsion and …
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Sympathetic detonation in long bore holes
Includes bibliographical references.
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The dynamics of multi-dimensional detonation
… theory is presented for the dynamics of detonation when the radius of curvature of the detonation shock is large compared with the one-dimensional steady Chapman-Jouguet (CJ) detonation reaction-zone thickness. The analysis considers additional time-dependence in the slowly-varying …
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Magnetohydrodynamic interactions in seeded detonation waves
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1960.
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Electro-magnetic effects in detonation waves
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1964.
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Methods of Diffusing Pulse Detonation Combustion
Pulse detonation combustion has been of interest for many years since it offers several advantages over standard deflagrative combustion. In theory, detonative combustion is a better use of fuel compared to deflagrative combustion since less entropy is generated during a detonation. As a result, …
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Investigation of Pulse Detonation Engines: the Effect of Variable Blockage Ratio on the Deflagration to Detonation Transition
<p>Detonation and constant volume combustion is well known to be thermodynamically more efficient than the typically utilized constant pressure. There have been numerous approaches of achieving detonation through deflagration-to-detonation transition most of which use evenly spaced obstacles with a …
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Influence of Fuel Inhomogeneity and Stratification Length Scales on Detonation Wave Propagation in a Rotating Detonation Combustor (RDC)
The detonation-based engine has the key advantage of increased thermodynamic efficiency over the traditional constant pressure combustor. These detonation-based engines are also known as Pressure Gain Combustion systems (PGC) and Rotating Detonation Combustor (RDC) is a form of PGC, in which the …
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A numerical study of attached oblique detonation
… to develop a predictive capability for oblique detonation waves (ODWs). Planar wedge flows and axisymmetric conical flows are considered. The Rankine-Hugoniot solution is reviewed first, which yields necessary conditions for attached ODWs. But this solution is limited to inviscid flows over …
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On Detonation Diffraction in Condensed-Phase Explosives
… theory including shock acceleration effects for detonation shock dynamics (DSD) is evaluated for PBX-9502. Comparisons of detonation diffraction in PBX-9502 are made between experiment, multi-material simulations using the calibrated equation of state and reaction rate, and DSD simulations using …
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Detonation modelling of non-ideal high explosives
… useful work. High explosives normally burn via a detonation; a supersonic wave consisting of a shock wave coupled to chemical energy release. Detonations in conventional HE (CHE) propagate with a typical velocity of 6 - 8 km/s. Insensitive HE (IHE) and non-ideal HE (NIHE) are of particular …
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Intake flow analysis of a pulsed detonation engine
… flow within the intake system of a pulse detonation engine (PDE). Using a quasi-one-dimensional approach the program provides insight into the unsteady nature of localized equivalence ratios to include their effects on PDE performance. The original FORTRAN program is converted into the …
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Theory of Detonation Structure for Two-Phase Materials
The structure of a two-phase steady detonation in a granulated solid propellant has been studied, and existence conditions for a one-dimensional, steady two-phase detonation have been predicted. Ordinary differential equations from continuum mixture theory have been solved numerically to determine …
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The Effect of Axial Spacing of Constant and Variable Blockages on the Deflagration-to-Detonation Transition in a Pulse Detonation Engine
… of obstacle spacing on the deflagration-to-detonation transition section length in a pulse detonation engine. Testing was conducted with one hundred and ninety-five different obstacle, and spacing configurations. The configurations included constant, as well as variable spacing between …
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Transient heat transfer properties in a pulse detonation combustor
The heat transfer along the axis of a pulse detonation combustor has been characterized for various frequencies and fill fractions at 2.5 atmospheres of pressure for chamber refresh conditions. In a pulse detonation combustor, a supersonic detonation wave is the method for transforming chemical …
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Investigation of Pulse Detonation Engines; Theory, Design and Analysis
<p>Detonation and constant volume combustion has been known to the scientific community for some time but only recently has active research been done into its applications. Detonation based engines have received much attention in the last two decades because of its simple design and potential …
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