NASA Scientific and Technical Aerospace Reports

20040073730 Stanford Univ., Stanford, CA
Interpreting Shock Tube Ignition Data
Davidson, D. F.; Hanson, R. K.; Oct. 2003; 24 pp.; In English; Original contains color illustrations
Contract(s)/Grant(s): DAAD19-01-1-0597
Report No.(s): AD-A422646; 03F-61; ARO-41100.4-EG; No Copyright; Avail: CASI; A03, Hardcopy
Chemical kinetic modelers make extensive use of shock tube ignition data in the development and validation of
combustion reaction mechanisms. These data come from measurements using a range of diagnostics and a variety of shock
tubes, fuels, and initial conditions. With the wide selection of data available, it is useful to realize that not all of the data are
of all the same type or quality, nor are all the data suitable for simple, direct comparison with the predictions of reaction
mechanisms. We present here a discussion of some guidelines for the comparison of shock tube ignition time data with
reaction mechanism modeling. Areas discussed include: definitions of ignition time; ignition time correlations (with examples
taken from recent n-heptane and iso-octane measurements); shock tube constant-volume behavior; shock tube diameter and
boundary layer effects; carrier gas and impurity effects; and future needs and challenges in shock tube research.
DTIC
Ignition; Shock Tubes
20040073733 Massachusetts Inst. of Tech., Cambridge, MA
Kinetics of Chemical Agents Destruction in Supercritical Water
Tester, Jefferson W.; Sullivan, Patricia A.; Ploeger, Jason M.; Lachance, Russell P.; Dec. 31, 2003; 21 pp.; In English; Original
contains color illustrations
Contract(s)/Grant(s): DAAD19-99-1-0211
Report No.(s): AD-A422649; ARO-39250.6-CH; No Copyright; Avail: CASI; A03, Hardcopy
The work accomplishments during this project consist of five different studies conducted by three current PhD students
in the laboratory. An experimental study of methylphosphonic acid (MPA) oxidation has been completed that includes
macroscopic modeling of the overall global rate law for MPA oxidation in supercritical water (SCW) and for the major
pathways in MPA oxidation. Additionally, an elementary reaction rate model for supercritical water oxidation (SCWO) of
MPA has been developed consisting of rate parameters from the available literature and ab initio calculations. Urea hydrolysis
kinetics have been experimentally measured at sub and supercritical water conditions. Additionally, recent studies in the
laboratory include a co-oxidation stud of MPA and ethanol kinetics in SCW and a methane SCWO experimental study.
DTIC
Destruction; Oxidation; Reaction Kinetics; Water
20040073746 Air Force Research Lab., Edwards AFB, CA
Polynitrogen and High Nitrogen Chemistry: A New World of Challenges
Vij, Ashwani; Mar. 25, 2004; 85 pp.; In English; Original contains color illustrations
Contract(s)/Grant(s): Proj-DARP
Report No.(s): AD-A422668; No Copyright; Avail: CASI; A05, Hardcopy
Polynitrogen compounds contain only nitrogen atoms and are expected to have unusual properties. Most important among
these are: High endothermicity Green propellant combustion product is only gaseous N2 High density High Isp values when
compared to other monopropropellants or bipropellants High detonation velocity
DTIC
High Energy Propellants; Nitrogen; Synthesis (Chemistry)
20040073756 Engineering Research and Consulting, Inc., Huntsville, AL
Preparation and Characterization of the First Binary Titanium Azides, Ti(N3)4, P(C6H5)4Ti(N3)5 and
P(C6H5)42Ti(N3)6 and on Linear Ti-N-NN Coordination
Christe, Karl O.; Haiges, Ralf; Schneider, Stefan; Schroer, Thorsten; Boatz, Jerry A.; Mar. 12, 2004; 21 pp.; In English;
Original contains color illustrations
Contract(s)/Grant(s): F04611-99-C-0025; Proj-DARP
Report No.(s): AD-A422680; No Copyright; Avail: CASI; A03, Hardcopy
Where as numerous partially azide-substituted titanium compounds had previously been reported, 1-7 no binary titanium
azides were known. In a recent theoretical study the group 4 metal tetrazides M(N3)4 (M = Ti, Zr, Hf, Th) were predicted 8
to be vibrationally stable exhibiting tetrahedral structures with unique linear M-N-NN bond angles (see Figure 1). All
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