Pulse Detonation Engines
PDE Information |
Resources for PDE Researchers
- An electronic (and print-on-paper)
has been developed for accessing
data on measured detonation properties such as cell width, critical tube diameter,
and critical initiation energy. This data base has a number of unique features,
and is meant to be a community project that can be used by all and maintained as
- Computational tools for ZND and CV
with detailed chemical reaction models are available.
- A library of
chemical reaction mechanisms and thermodynamic data is available for
use with the CHEMKIN-compatible software.
- Reaction mechanism validation study, shock tube data and ZND
- Impulse model predictions
We have carried out chemical equilibrium computations and used a simple
gas dynamic model to predict detonation properties (CJ velocity, pressure, sound speed, gamma),
Taylor wave properties (plateau pressure, sound speed), and the ideal
impulse for a straight detonation tube. The methodology and
original data are described iin the following publications.
Recently (Fall 2003), we have revised our model slightly and based the
Taylor wave properties on equilibrium flow instead of frozen flow
within the expansion wave. The model was also recalibrated against a
larger data set. The net result that the empirical constants for
standard ambient pressure and straight tubes remains the same as the
original fit but the predicted impulse is slightly higher for
high temperature (fuel-oxygen) cases.
E. Wintenberger, JM Austin, M.
Cooper, S. Jackson, and JE Shepherd "An analytical model for the impulse of
a single-cycle pulse detonation tube. " Preprint, see final paper in
Journal of Propulsion and Power, 19(1), 22-38, Jan-Feb 2003.
- (PDF) E
Wintenberger, JM Austin, M Cooper, S Jackson, and JE Shepherd.
"Impulse of a single pulse detonation
tube", GALCIT Report FM00-8, August 2002.
The differences between the two models are only apparent for the Taylor
wave plateau properties and impulse prediction for fuel-oxygen
mixtures. For the most extreme cases, near stoichiometric mixtures, the
equilibrium flow impulse values are about 5-10% higher
than the frozen flow values. The difference between equilibrium and
frozen flow decreases with increasing nitrogen dilution (decreasing temperatures)
and for all practical purposes, the two models can not be distinguished for
Mixtures: JP10, Jet A, H2, C2H2, C2H4, C3H8 with either O2 or air.
Conditions: Stoichiometric O2 or Air mixtures, 300 K, 0.2 to 2 bar
Variable equivalence ratio for O2 and Air mixtures, 300 K and 1 bar.
- REVISED model predictions based on equilibrium flow (Excel) (PDF)
- Experimental data (from FM00-8) and original model predictions based on frozen flow (Excel) (PDF)
The issues related to chemical nonequilibrium are discussed briefly in our
Response to comments by Radelescu and Hanson. This is a preprint, see the final version
in Journal of Propulsion and Power. A more thorough discussion is
given in Chapter 6 of Cooper's
PhD thesis and the application to the single
tube impulse model is discussed in Section 4.3.4 of Wintenberger's
- JP-10 cell width measurements
- Miscellaneous shock wave, detonation, and thermodynamic properties