This paper reports an exploratory experimental cold flow test of the first mode in a multi-mode propulsion concept. A small model of a wallmounted pulse detonation rocket (PDR) ejecting into a duct was fabricated and integrated into the supersonic wind tunnel at the University of Texas at Arlington (UTA). Although supersonic testing proved to be inconclusive, the static tests showed that pulsed...

Dynamics of ethylene autoignition and deflagration-to-detonation transition (DDT) are first numerically investigated in a one-dimensional shock tube using reduced chemistry including 10 species reactions. Different combustion modes through considering various premixed gas equivalence ratios (0.2 [Formula: see text] 2.0) incident wave Mach numbers (1.8[Formula: text]3.2). Four ignition DDT obser...

The transmission of a detonation wave across layer inert gas is studied via one- and two-dimensional numerical simulations based on the reactive Euler equations. resulting transient process from one-dimensional first explored in detail, analyzed distance-time characteristic diagrams. physics this same until end quasi-steady period. Afterward, energy release combustion may couple to dynamics. Th...

The oblique detonation induced by a two-dimensional semi-infinite wedge is simulated numerically with the Navier–Stokes equations and detailed H 2 /air reaction model based on open-source program-Adaptive Mesh Refinement in Object-oriented C++. A spatially seventh-order-accurate weighted essentially non-oscillatory scheme adopted for convective flux discretization. formation evolution of wedges...

The paper is devoted to a numerical study of detonation initiation in the gas mixture channel with profiled end. Initiation occurs as result reflection shock wave relatively low intensity from end channel. Numerical calculations are carried out using unstructured triangular grids. algorithm parallelized by computational domain decomposition method METIS library. exchange grid function values be...

A kinetic model based on the particles demand method is introduced for gas phase detonation hydrodynamics in conjunction with Lee–Tarver reaction model. The proposed realized two- and three-dimensional lattices validated a set of benchmarks. Quantitative validation performed Chapman–Jouguet theory up to wave speed Mach 20 one dimension. Two-dimensional outward expanding circular tested isotropy...

Research at the Explosion Dynamics Laboratories at Caltech over the past three years under an ONR contract has examined many issues critical to Pulse Detonation Engine (PDE) development. These include: fundamental and applied studies of detonation initiation; detonation cell width measurements to characterize fuels, including JP10; visualization of the reaction zone structure of propagating det...

One of the basic equations to analyze the detonation of high explosives is the equation of state of the detonation products. Due to the very high pressure of the product, the direct measurement of the thermodynamic variables such as pressure or temperature is not possible. In this research, the parameters of BKW and HOM equations of state of detonation products are determined via experimental m...

The coupling of a dynamically adaptive Eulerian Cartesian detonation solver with hierarchical time step refinement to a Lagrangian thin-shell finite element solver with fracture and fragmentation capabilities is presented. The approach uses a level set function to implicitly represent arbitrarily evolving solid structures on the Cartesian mesh. The auxiliary algorithm used to efficiently transf...

an optical system has been redesigned and used to measure detonation velocity as a function of condensed explosive density for rdx, hmx, petn. these measurements are then used to determine and fine tune parameters appearing in the bkw (beker-kistiakowsky-wilson) equation of state for gases at extremely high pressures. steady state form of conservation equations along with the bkw state equation...