Detonation initiation by hypervelocity projectiles
نویسندگان
چکیده
Abstract: We report experimental studies on the initiation of detonations by hypervelocity projectiles in hydrogen-oxygen-nitrogen mixtures. The experimental facility T5 at Caltech was modified to launch 25-mm diameter projectiles at speeds around 3000 m/s. Flow visualization and pressure measurements are reported for several mixture conditions. A clear transition between shockinduced combustion and detonation is observed. Transition to detonation is observed with an overtaking wave occurring in the shocked but unreacted gas.
منابع مشابه
Paper Title: Oblique Detonation Stabilized on a Hypervelocity Projectile Authors
We present new experimental results demonstrating the initiation and stabilization of an oblique detonation by a hypervelocity projectile. Projectiles 25 mm in diameter were launched at nominal velocities of 2700 m/s into stoichiometric H2-O2-N2 mixtures at pressures between 0.1 and 2.5 bar. A critical threshold in initial pressure was found to be required for the establishment of detonations. ...
متن کاملInitiation of stabilized detonations by projectiles
A high-speed projectile in combustible gas can initiate and stabilize a detonation wave under suitable conditions [1]. In this paper, numerical simulations of projectile induced detonation waves are presented. Using a one-step irreversible reaction model, the transition from shock-induced combustion to stabilized oblique detonation is observed via numerical simulations. An analysis of this tran...
متن کاملChemistry and Phase Transitions from Hypervelocity Impacts
Molecular dynamics simulations are used to study hypervelocity impacts of an ultrathin flyer plate with a semi-infinite two-dimensional model diatomic molecular solid. We show that these hypervelocity impacts can produce a dissociative phase transition from a molecular to a close-packed solid in the target material. We also show that hypervelocity impacts of ultrathin plates can produce extensi...
متن کاملNumerical Study of Blast Initiation of Detonation Using a Two Step Chemical Kinetics Model
The effect of chemical reactions on the blast initiation of detonation in gaseous media has been investigated in this paper. Analytical method is based on the numerical solution of onedimensional reactive Euler equations. So far, analyses on the blast initiation of detonation have modeled the combustion process as a one-step chemical reaction, which follows the Arrhenius rate law. Previous stud...
متن کاملLaboratory investigations of the survivability of bacteria in hypervelocity impacts.
It is now well established that material naturally moves around the Solar System, even from planetary surface to planetary surface. Accordingly, the idea that life is distributed throughout space and did not necessarily originate on the Earth but migrated here from elsewhere (Panspermia) is increasingly deemed worthy of consideration. If life arrived at the Earth from space, its relative speed ...
متن کامل