Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 15 of 15 for “"aluminum combustion"”.
-
High temperature spectroscopic measurements of aluminum combustion in a heterogeneous shock tube
Aluminum is an important energetic material that burns with a variety of oxidizers with a high reaction enthalpy. It is a top performer for energy density if oxidizer mass is considered as well as the fuel. Because of this, it is often used as an energetic additive in anaerobic conditions because …
-
Optical measurements of nano-aluminum combustion in a heterogeneous shock tube and in a flat flame burner
Metal additives are commonly used in combustion based devices such as high explosives and solid rocket motors. Of these, aluminum is the most common due to its availability, high energy density, and low toxicity; however, many aspects of nano-aluminum combustion are still not well understood. …
-
Using optical techniques to measure aluminum burning in post-detonation explosive fireballs
… propellants to increase the heat of explosion. Aluminum is commonly used because it has a high energy density, is relatively inexpensive, is easy to produce, and has a low toxicity. To optimize the performance and safety of aluminized explosives, it is necessary to understand where, when, and …
-
Experimental Investigation of Gaseous Oxyacetylene Blast Enhancement by the Combustion of Suspended Multimodal Spherical Aluminum Powder
Multimodal micron-sized spherical aluminum powders were subjected to the detonation products of a gaseous oxyacetylene mixture. The objective was to analyze the blast enhancement from the combustion of non-uniform-sized aluminum particles. These multimodal aluminum powders consisted of a 50/50 …
-
Spectroscopic Measurements of the Combustion of Aluminum and Aluminum-Based Energetic Material Particles Using a Heterogeneous Shock Tube
Aluminum is a desirable component of propellants, explosives, and energetic materials due to the high energy release associated with its oxidation. Considerable research has been done on aluminum combustion, but questions remain about the behavior of aluminum particles, particularly at small …
-
Dynamics of nanoparticle combustion
… shock tube was used to ignite and measure the combustion behavior of the nano-aluminum suspension behind reflected shock waves. The burning time and particle temperatures were measured using optical diagnostics. In order to use pyrometry measurements for nano-aluminum particles, the emissivity …
-
Burn time measurements of micron sized Al-Mg alloys and Mg in a heterogeneous shock tube in different oxidizing environments
Metal additives have been widely used in combustion applications such as solid rocket motors and high explosives. There have been a vast number of studies performed on aluminum, magnesium, boron, beryllium to determine their combustion mechanism and to attempt at extracting their high energy …
-
Experimental testing of bimetallic and reactive shaped charge liners
… in tests 1 - 9 were either solid copper, solid aluminum, or a bimetallic design consisting of a copper cone with an aluminum insert. The bimetallic liners showed some light emission that indicated hydroreaction, but their depth of penetration was 56% less than the solid copper liners. Peak …
-
Hydration-Induced Plasma Surface Modification of Aluminum Nanoparticles for Power Generation in Oxygen Deficient Environments
… to increase the energy release rate from aluminum (Al) combustion is to modify the alumina (Al2O3) passivation shell surrounding the Al fuel core. One approach uses atmospheric plasma treatment to physically reduce the Al2O3 shell thickness while simultaneously exposing the defected …
-
Initiation and ignition of nano-aluminum in Teflon
The combustion of nano-aluminum in Teflon was studied using time-resolved laser spectroscopy. This reactive material has a stored energy of ~21 kJ cm-3, nearly twice the energy content of the best molecular explosives. Experiments investigated the fundamental combustion processes of initiation and …
-
Experimental observations of aluminum particle combustion during hypervelocity water impact and penetration
… not been isolated. The difficulty of studying combustion in this physical situation is due to the extremely transient nature of the combustion and the difficulty of implementing common diagnostics. This research presents a novel approach to isolating the combustion which occurs between …
-
Enhanced combined effects in aluminized explosives by an innovative initiation system
… have aimed to understand the intricate role of aluminum in prompt detonation for divergent and convergent schemes. This clarity addresses the predictive discrepancies of large-scale tests noted by LLNL, AFRL, NSWC-IH, and others. This work identifies the challenges centered around the size …
-
Optimization of enhancements to aluminum-based structural energetic materials
… that reacts in the detonation environment. Aluminum is a good candidate for this application due to its low cost, widespread availability, good manufacturability, and high enthalpy of combustion. Difficulty arises in the timely ignition of the aluminum. A plain aluminum case produces mostly …
-
Further experimental investigations of underwater reactive shaped charge liners and aluminum particle combustion during hypervelocity water impact and penetration
… chemical energy is available in the form of combustion, the coupling of this energy to the target depends critically on the rate and position of energy deposition. Since this information is vital to forecasting damage to the target during the transient event, fundamental combustion knowledge …
-
Metal based reactive nanocomposites prepared by cryomilling
Aluminum is one of the most commonly used metal fuel additives for propellants, explosives, and pyrotechnics. Recent interest has been focused on replacements for aluminum as fuel additives to achieve higher combustion temperatures and stronger pressure pulses for applications in advanced munitions …