Experimental characterization of galloping detonations in unstable mixtures

Direct Simulation of Ultrafast Detonations in Mixtures

For nearly a century experimental measurements of the velocities of detonations in gases have been found in general agreement with those of the Chapman-Jouguet (C-J) hypothesis predicting velocities, relative to the burned gases, equal to the speed of sound in the burned gases. This was further supported by the Zeldovich von Neumann Döring (ZND) theories predicting Chapman-Jouguet velocities fo...

Detonations in H2-N2O-CH4-NH3-O2-N2 Mixtures

This report describes experimental studies and analyses on the detonation properties of flammable gases that may be present in the waste storage tanks at Hanford, WA. These studies were carried out in the Explosion Dynamics Laboratory, part of the the Graduate Aeronautical Laboratories of the California Institute of Technology (GALCIT). Detonation cell sizes and pressures were measured in the G...

Boundary feedback stabilization of homogeneous equilibria in unstable fluid mixtures

We consider the problem of boundary feedback stabilization of homogeneous equilibria in unstable fluid mixtures that are governed by unstable linear reaction-convection-diffusion equations. We extend boundary feedback control laws designed for the one-dimensional reaction-diffusion equation using the backstepping method to this higher-dimensional case. We show that, under certain mathematical c...

Deflagrations, Detonations, and the Deflagration-to-Detonation Transition in Methane-Air Mixtures

A Galloping Horse Model a Galloping Horse Model

A two-dimensional numerical model of a horse is presented that predicts the locomotory behaviors of galloping horses, including how stride frequency, stride length, and metabolic rate change from a slow canter to a fast gallop. In galloping, each limb strikes the ground sequentially, one after the other, with distinct time lags separating hind and forelimb footfalls. In the model, each stance l...