| |
| Thesis Name： |
The combustion of lithium-aluminum alloy fuels in oxygen and water vapor. |
| Usage： |
chemistry |
| Keyword： |
combustion of lithium-aluminum alloy fuels,oxygen and water vapor |
| Remarks： |
Abstract:
The combustion of a lithium-aluminum alloy was investigated using opticaldiagnostics and a computational flame model. Chemical kinetic mechanisms were developed to modelcombustion of the Li-Al alloy in oxygen and in water vapor. The alloy was heated inductively in acrucible and burned with air, oxygen/argon mixtures, and water vapor in a counterflow diffusionflame. Bulk alloy temperature was held relatively constant during combustion, allowing alloytemperatures in the 1000–1400 K range to be studied. The flame temperature profile wasmeasured using a resonance line reversal method, and the relative lithium atom population in theflame was measured using an absorption method. The products of combustion were collected andanalyzed using x-ray diffraction (XRD) and field-emission scanning electron microscopy/energydispersive x-ray spectroscopy (FESEM/EDS). The primary condensed-phase products of combustion inboth oxygen and water vapor are Li2O, γ-LiAlO2, andβ-Li5AlO4; in addition, some solid LiOH is produced during combustion inwater vapor. Although aluminum monoxide (AlO) gas was detected at ignition in air and water vapor ina limited number of tests, evidence indicates that aluminum does not burn in the vapor phase duringsteady-state combustion of the alloy. Experiments and counterflow diffusion models both show thatthe lithium burns in the vapor phase and aluminum reacts on the surface or in the bulk phase to formγ-LiAlO2, and β-Li 5AlO4. Models indicate thatLi2O is the primary gas-phase product in dry oxidizers and that H2 and LiOHare the primary gas-phase products in water vapor. This work provides the first experimentalevidence that the aluminum in a lithium-aluminum alloy reacts in the liquid phase, the firstchemical kinetic mechanisms to describe lithium vapor-phase flames, and the first chemical kineticmechanisms for combustion of a metal alloy.
Author:Moore, James Thomas.
Unit:The Pennsylvania State University. |
| Original file： |
No File
|
|
Promulgator Detail |
| Full name: |
administrator |
| Country: |
CN |
| City: |
Dalian |
| Company Name: |
teloon Soft Strategy Co.,LTD |
| Homepage: |
http://www.hichem.com |
| E-mail: |
reply |
| Phone: |
86-411-82811662 |
| Fax: |
86-411-82819667 |
| Company Address: |
26 Renmin Road ,Dalian China |
| Zip/Postal Code: |
116001 |
| Introduction: |
As a professional E-information service platform with authoritative news and reports in chemical industry of chinese export and import market.Hichem has been received universally and praised highly since its established in 2001.In 2003,by joint effort of teloon chemicals and teloon soft strategy company(TSSC),Hichem team endeavored to recomposition the site ascribed to market requirement as well as offering our better service.Hichem focused on business to biusiness of new chemicals,fine chemicals,high chemicals and special chemicals.So naturally it is the very one-stop website for chemical information.Our sellers worldwide and build global on-line trade in the chemical industry. |
|
|
|
|
