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\large
\centerline{\Huge\bf The Detonation Database Project}
\centerline{\LARGE\bf Explosion Dynamics Laboratory}
\centerline{\Large\bf Graduate Aeronautical Laboratories}
\centerline{\Large\bf California Institute of Technology}
\centerline{\large Michael Kaneshige $\cdot$ Joseph E. Shepherd $\cdot$
 Andrzej Teodorczyk}

\newpage
\centerline{\bf\Large Introduction}
\bigskip

{\bf Background} Experimental data are particularly important for
studies and analyses of gaseous detonations.  This is a reflection of
the largely empirical nature of our knowledge about detonation behavior,
a consequence of the 
complexity of detonation phenomena, which encompass aspects of compressible
fluid dynamics, thermodynamics, and gas phase chemistry.    The large number of
publications containing detonation data presents a formidable challenge
to detonation researchers wishing to utilize previous results.
\medskip

{\bf Purpose} This database was initially started for the
purposes of supporting our activities at Caltech in cell size
measurement and correlation with ZND models based on detailed
chemical reaction mechanisms.  It quickly became clear that it
was also very useful for other
experimental or numerical studies and explosion hazard analyses
carried out in the Explosion Dynamics Laboratories at the
California Institute of Technology.  
\medskip

{\bf Accessibility}  The project has evolved into an electronic publication
\medskip

\centerline{\bf http://www.\-galcit.\-caltech.\-edu/\~{}jeshep/\-detn\_db/\-html/} 
\noindent and a print-on-paper version, available as a 
PostScript file (1.63 MB) that can be downloaded through the WWW version.  
Each format contains the same information with somewhat different features.
For instance, the printed document is more readable, but the WWW version
offers a search engine.

{\bf Contents}
To keep the diversity
of data manageable, the scope is limited to several canonical categories,
namely cell size, critical tube diameter, critical energy, and minimum
tube diameter, but the types of fuels, oxidizers, diluents, and conditions
is unlimited. 
\medskip

{\bf Statistics} The usefulness of the database depends on its
convenience and its coverage.  The database cites 120 references and
is organized into 281 separate data sets.  These data sets are combined
and summarized in 78 graphs.  Altogether, this amounts to 185 pages of
printed matter, with explanatory text.  The success of the database
is best measured by its popularity.  During the month of July, 1997,
the World Wide Web version received a total of 3490 hits, from 103
separate sources.

\newpage
\centerline{\Huge\bf Organization}
\bigskip

For the sake of presentation, the database is composed of a list of
references, a collection of data sets (tables), and a collection of
graphs that combine and display the tabulated data.  These are cross
referenced as shown below, so that data that appear useful from a graph
can be accessed directly as tabulated numbers and then traced to the
original source.  The document exists in printed and electronic (WWW) form.
The electronic form incorporates a search engine that interactively
organizes links to the references, data sets, and graphs that match the
search parameters.
\bigskip

Currently, the data consist of four categories: cell size, critical tube
diameter, minimum tube diameter, and critical energy.  Within each
category, the data are generally grouped by fuel.  Naturally, some
exceptions are necessary because important data presented in the literature
do not always conform to this categorization.

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\newpage
\centerline{\Huge\bf Function and Operation}
\bigskip

The database document is never complete, but grows as new data are
located and added.  With respect to the printed form and the static
WWW form, this only means that the various graphs, references, and
links must be updated periodically.  The search engine is of course
dynamic in nature, returning all parts of the latest static document
that match the search parameters.
\bigskip

\psfig{figure=../docs/schematic.ps,angle=270,width=5.5in}

The processes and tools used to update the document in all its forms,
including the dynamically generated search reports, are shown in the
diagram above.  The flowchart is representative of the complexity of
the project, although the actual update procedure is heavily automated.

\newpage
\centerline{\Huge\bf Contributing Data}

Our efforts to locate and digitize important data sets and integrate
them into the database have been, by no means, exhaustive.  If you have
a data set or are aware of a reference that has not been included
in the database but would contribute to its mission, please bring
it to our attention.  We are only interested in data that appear in
citable documents, and peer reviewed archival literature sources are
preferred.  If the source is difficult to access, we will need copies
of it.  Send contributions to either of the following addresses.  Email
and ASCII files are the preferred modes of communication.
\bigskip

\centerline{\parbox{3.5in}{
Professor Joseph E. Shepherd\\
MC 205-45\\
Graduate Aeronautical Laboratories\\
California Institute of Technology\\
Pasadena, California  91125\\
jeshep@galcit.caltech.edu}}
\bigskip

If you are sending your own data, tabulated form is preferred.  Please
include as much information as possible about the conditions of the
experiments.  Note that the database may, in the future, include more
types of information than it currently does, for instance qualitative
observations by the experimenter. 

A typical data set should be formatted something like (although
delimiters other than comma-space can be handled):
\begin{verbatim}
#Initial Pressure (atm), Initial Pressure (kPa), Cell Width
0.0945, 9.57285, 18.6476
0.1313, 13.30069, 11.5441
0.1997, 20.22961, 6.4376
0.2611, 26.44943, 4.1347
0.3269, 33.11497, 3.3348
0.3269, 33.11497, 3.1164
0.3923, 39.73999, 2.6078
\end{verbatim}

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