
Vincent RodriguezÉcole Nationale Supérieure de Mécanique et d'Aérotechnique | ENSMA · Department of Fluids, Thermal and Combustion Sciences
Vincent Rodriguez
Associate Professor
My researches focus on experimental work on shock waves and detonation (transmission, propagation, quenching, DDT, SDT).
About
29
Publications
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Introduction
I work on experimental research including dynamics of shocks and detonations, which deal with the transmission of detonations, their maintenance or extinction and their reignition via deflagration-to-detonation or shock-to-detonation transitions. The applications are propulsion and industrial safety. My current studies deal with the initiation, propagation and transmission of detonations in curved geometries, and extinction and reignition of detonations after passing through an obstacle.
Additional affiliations
September 2016 - present
October 2014 - August 2016
September 2011 - September 2014
Publications
Publications (29)
We study the transient dynamics of three-dimensional detonation cells when the detonation front is subjected to weak expansion due to the diffraction from a straight channel to a diverging channel. We focus on the effect of the cross-sectional shape, namely square or round, using diverging channels with the same initial cross-sectional area of 16 c...
We present a model for predicting a representative width for the three-dimensional irregular patterns observed on the front views of cellular detonation fronts in reactive gases. Its physical premise is that the cellular combustion process produces the same burnt mass per unit of time as the average planar steady Zel’dovich-von Neuman-Döring (ZND)...
This experimental and numerical work reports on the dynamical behaviour of a shock in an inert gas at the concave wall of a hollow circular chamber. The gas in the chamber was air or He + \({\rm O}_{2}\) + 2 Ar at initial pressures \(p_{{\rm c0}}\) ranging from 2 to 12 kPa and initial temperature T0 =288 K. The shock was generated using a detonatio...
We present a model for predicting a representative width for the three-dimensional cells observed on detonation fronts in reactive gases. The physical premise is that the 3D unsteady cellular process for irregular cells is stochastic and produces the same burned mass per unit of time as the average planar steady ZND process. Graph theory defines an...
We present a model for predicting a representative width for the three-dimensional cells observed on detonation fronts in reactive gases. The physical premise is that the 3D unsteady cellular process for irregular cells is stochastic and produces the same burned mass per unit of time as the average planar steady ZND process. Graph theory defines an...
The notions of regularity and characteristic width of detonation cells are revisited based on crossed analyses of experimental front-view and longitudinal recordings obtained with the soot-plate technique. Tubes with cross-sections of different shapes, namely round, triangular and square, but the same surface area of 16 cm2, are used to detonate th...
This experimental work investigates the possibility to non-dimensionalize the limits and the distances of the deflagration-to-detonation transition process (DDT). The deflagration was ignited using jets of hot gases generated by the impact of a Chapman-Jouguet detonation on a multi-perforated plate. The tube was 1 m long with a square cross section...
The dynamics of detonation transmission from a straight channel into a curved chamber was investigated numerically and experimentally as a function of initial pressure (10 kPa ≤ p0 ≤ 26 kPa) in an argon diluted stoichiometric H2–O2 mixture. Numerical simulations considered the two-dimensional reactive Euler equations with detailed chemistry; hi-spe...
The dynamics of detonation transmission from a straight channel into a curved chamber was investigated numerically and experimentally as a function of initial pressure (10 kPa ≤ p_0 ≤ 26 kPa) in an argon diluted stoichiometric H2-O2 mixture. Numerical simulations considered the two-dimensional reactive Euler equations with detailed chemistry; hi-sp...
The dynamics of detonation transmission from a straight channel into a curved chamber was investigated as a function of initial pressure using a combined experimental and numerical study. Hi-speed Schlieren and *OH chemiluminescense were used for flow visualization; numerical simulations considered the two-dimensional reactive Euler equations with...
This experimental work reports on detonation behaviors in a curved chamber without inner wall after diffraction of a Chapman–Jouguet (CJ) detonation from a straight channel tangent to the chamber outer wall. The upper and lower faces of the chamber receive either soot foils for recording the history of the transmission dynamics, or optical windows...
This work is about experimental study of a planar shock wave which slides over a water surface. The aim is to observe the air-water interface and the droplet entrainment. Experiments are performed at atmospheric pressure in a 200 × 200-mm²-square-cross-section shock tube for depths of 10, 20, and 30 mm and two incident planar shock waves having Mac...
Detonation for propulsion is considered for the last fifty years for benefices it offers comparing to standard combustion modes. The present study focuses on the dynamics of detonation in a curved chamber which mimics the behavior inside a Rotating Detonation Engine (RDE). The main highlighted phenomena is the existence of an overdriven detonation...
Recently, we experimentally studied, in a shock tube environment, shock waves propagating over horizontal free water layers having depths of 10, 20, and 30 mm for shock wave Mach numbers \(M_\mathrm {is}\) equal to 1.1 and 1.4. The qualitative interaction process was observed by means of high-speed visualizations, and the pressures arising in the a...
During the last decade, investigations have been achieved to determine the physical mechanism which governs particle jet formation induced by the dispersion of a granular medium exposed to an impulsive pressure load, i.e., by a shock or a blast wave. This kind of such physical mechanism is observed during explosions or in nature as volcanic eruptio...
Studying detonation dynamics along the concave outer wall of a cylindrical chamber is helpful for
understanding the possible detonation configurations in the combustion chamber of a rotating detonation
engine (RDE). Only a limited number of studies into detonation in curved channels is available.
Nevertheless, Kudo et al. [1] and Nakayama et al. [2...
This work is about experimental study of a planar shock wave which slide over a water surface. The aim is to observe the air-water interface and the droplet entrainment which is associated. Experiments are performed at atmospheric pressure in a 200×200-mm²-square-cross-section shock tube for depths of 10, 20 and 30 mm and two incident planar shock...
The dispersion of particles by blast or shock waves induces the formation of coherent structures taking the shape of particle jets. In the present study, a blast wave, issued from an open shock tube, is generated at the center of a granular ring initially confined in a Hele-Shaw cell. With the present experimental setup, solid particle jet formatio...
In this work, we conduct experiments to study
the interaction between a horizontal free water layer and a
planar shock wave that is sliding over it. Experiments are
performed at atmospheric pressure in a shock tube with a
square cross section (200 × 200mm2) for depths of 10, 20,
and 30 mm; a 1500-mm-long water layer; and two incident
planar shock w...
In this work, we conduct experiments to study the interaction between a horizontal free water layer and a planar shock wave that is sliding over it. Experiments are performed at atmospheric pressure in a shock tube with a square cross section (200x200 mm²)) for depths of 10, 20, and 30 mm; a 1500-mm-long water layer; and two incident planar shock w...
The dispersion of a cylindrical particle ring by a blast or shock wave induces the formation of coherent structures which take the form of particle jets. A blast wave, issuing from the discharge of a planar shock wave at the exit of a conventional shock tube, is generated in the center of a granular medium ring initially confined inside a Hele-Shaw...
When solid particles are impulsively dispersed by a shock wave, they develop a spatial distribution which takes the form of particle jets whose selection mechanism is still unidentified. The aim of the present experimental work is to study particle dispersal with fingering effects in an original quasi-two-dimensional experiment facility in order to...
For several years, investigations have been achieved to determine the physical mechanism which governs particle jet formation induced by the dispersion of a granular medium exposed to an impulsive pressure load, i.e. by a shock or a blast wave. This kind of such physical mechanism is observed during explosions or in nature as volcanic eruptions [1]...
Experimental studies shown that when solid particles are submitted to a shock wave, they are dispersed, often developing a uniform spatial distribution. This phenomenon takes the form of clusters of particles or coherent jets which may persist for some distance during the dispersion. The aim of this experimental investigation is to study the phenom...