Three-Dimensional Mixing/Reacting Zone Structure in a Supersonic …
The flow field of a supersonic flow chemical oxygen-iodine laser is simulated by solving three-dimensional Navier-Stokes equations and the effects of the mixing/ reacting zone structure on the resulting gain region are studied. It is assumed that the flow is laminar and the water vapor condensation due to the supersonic cooling is …
Mixing and Reacting Zone Structure in a Supersonic Mixing …
The adoption of a ramp nozzle array in supersonic mixing chemical oxygen-iodine lasers is examined by simulating the mixing and reacting flow fields numerically. Then, the efficiency of the ramps in improving the resulting gain region is studied. The compressible Navier-Stokes equations with a detailed chemical kinetic …
Parametric study of a highly efficient chemical oxygen-iodine laser
A supersonic expansion nozzle has allowed us to achieve highly efficient operation of the supersonic mixing chemical oxygen–iodine laser (COIL). The nozzle's shape produced a rapid mixing of ...
Laser-Induced Iodine Fluorescence Applied to Confined Supersonic Mixing
In this study, the iodine LIF technique is applied to study the shear layer growth in the mixing chamber of a supersonic ejector test section at three convective Mach numbers. 2. LASER-INDUCED IODINE FLUORESCENCE TECHNIQUE The laser-induced fluorescence process can best be explained by means of Figure 2, where the potential …
High-Pressure Nozzle Bank for a Chemical Oxygen …
COIL is the gas mixing in supersonic flow. Since mixing of a near-hypersonic nitrogen flow with a Mach-one oxygen flow is expected to be extremely slow, mixing enhancement schemes are required to achieve reasonable mixing within a practical distance. Nikolaev et al. used under-expanded high-pressure nitro-gen flow to produce …
CFD Modeling of Chemical Oxygen-Iodine Laser with
The flow field of a suipersonic flow chemical oxygen-iodine laser is simulated by solving three-dimensional Navier-Stokes equations and the effects of the mixing / reacting zone structure on the ...
High-Pressure Nozzle Bank for a Chemical Oxygen …
The most widely used approach for laser medium generation has been the use of subsonic mixing and dissociation of molecular iodine in an O2(1 ) medium with high dilution by …
Comparing the efficiency of supersonic oxygen-iodine laser …
The paper presents experimental studies of supersonic oxygen-iodine laser (OIL) using twisted-flow singlet oxygen generator (SOG) over a wide range of the singlet oxygen pressures and the buffer gas flow rates. The experiments used different designs of the nozzle unit and mixing system for singlet oxygen and iodine gas with the carrier …
Development of Hybrid Simulation for Supersonic Chemical Oxygen Iodine
A supersonic expansion nozzle has allowed us to achieve highly efficient operation of the supersonic mixing chemical oxygen–iodine laser (COIL). The nozzle's shape produced a rapid mixing of ...
An experimental research on the mixing process of supersonic …
The O 2 (1 Δ)/I 2 mixing process is one of the most important steps in chemical oxygen–iodine laser (COIL). Based on the chemical fluorescence method (CFM), a diagnostic system was set up to image electronically excited fluorescent I 2 (B 3 П 0) by means of a high speed camera.An optimized data analysis approach was proposed to …
Experimental investigation of a supersonic swept ramp injector using
Experimental study of mixing enhancement using pylon in supersonic flow Acta Astronautica, Vol. 118 Optimization of Combined Rocket and Ramjet/Scramjet Ballistic Missile Designs
A 33% efficient chemical oxygen–iodine laser with …
We report on a highly efficient supersonic chemical oxygen–iodine laser (COIL), with supersonic mixing of iodine and oxygen. Output power exceeding 0.5 kW with chemical efficiency of ∼33% was obtained in a 5-cm gain length for Cl 2 flow rate of …
(PDF) Nearly attaining the theoretical efficiency of supersonic …
The mixing efficiency for supersonic injection of iodine (~ 0.85) is found to be much larger than for transonic injection (~ 0.5), the maximum values of the gain being ~ 0.65%/cm for both ...
Review of Filtered Rayleigh Scattering technique for mixing …
To carry out non-reacting mixing studies in supersonic flow, passive scalar such as noble gases can be used as a fuel simulant. In mixing experiments, ... An Iodine molecular notch filter is placed before a CCD camera to suppress the stray laser reflections from the wind-tunnel walls. The testing facilities for high speed flows often involve ...
Parametric study of a highly efficient chemical oxygen-iodine …
We report on a detailed parametric study of the extremely efficient supersonic chemical oxygen-iodine laser recently developed in our laboratory [V. Rybalkin, A. Katz, B. D. Barmashenko, and S. Rosenwaks, Appl. Phys. Lett. 85, 5851 (2004)].At the early stage of operation, 40.0% efficiency was measured for 1 s followed …
Supersonic Mixing of Chemical Oxygen-Iodine Laser with …
The adoption of ramp nozzle array to a supersonic mixing chemical oxygen-iodine lasers is examined by simulating the mixing and reacting flow fields numerically. Then, the efficiency of the ramps ...
An experimental research on the mixing process of supersonic …
The mixing efficiency for supersonic injection of iodine (∼0.85) is much larger than for transonic injection (∼0.5), the maximum values of the gain being ∼0.65%/cm for both injection schemes.
Numerical research on mixing characteristics of different
A numerical method using AUSMDV scheme and k-ω SST turbulence model with an explicit compressibility correction was developed, and a 3-D numerical simulation of a supersonic flow field with a vertical sonic jet of hydrogen was performed. Good agreement between numerical results and experimental data validated the reliability of …
efficient supersonic chemical oxygen–iodine laser operating …
We report on an efficient supersonic chemical oxygen-iodine laser, energized by a jet-type singlet oxygen generator, operating without primary buffer gas and applying simple nozzle geometry and transonic mixing of iodine and oxygen.
A 33% efficient chemical oxygen-iodine laser with supersonic mixing …
Highly efficient supersonic chemical oxygen-iodine laser (COIL), with supersonic mixing of iodine and oxygen was investigated. Different mixing schemes were also compared. It was found that for supersonic mixing, the output power and chemical efficiency were about 20% higher than for transonic mixing scheme.
(PDF) Optimization of a Highly Efficient …
The mixing efficiency for supersonic injection of iodine (~ 0.85) is found to be much larger than for transonic injection (~ 0.5), the maximum values of the gain being ~ 0.65%/cm for both...
Laser-induced fluorescence visualization on supersonic mixing …
Mixing in a supersonic COIL laser: influence of trip jets. 5 August 2010 | Experiments in Fluids, Vol. 50, No. 2. Quantitative Mixing Measurements of a Supersonic Injection COIL Nozzle with Trip Jets. ... Laser-induced iodine fluorescence technique for quantitative measurement in a nonreacting supersonic combustor.
Computation of mixing flowfield of chemical oxygen-iodine …
The computational simulations of the mixing flow field of supersonic chemical oxygen-iodine laser (COIL) using FLUENT (CFD) computation of fluid dynamics commercial software have been performed ...
Parametric study of a highly efficient chemical oxygen-iodine …
Parametric study of a highly efficient chemical oxygen-iodine laser with supersonic mixing of iodine and oxygen. Authors: V. Rybalkin. A. Katz. B. D. …
A 33% efficient chemical oxygen-iodine laser with supersonic …
The mixing efficiency for supersonic injection of iodine (∼0.85) is much larger than for transonic injection (∼0.5), the maximum values of the gain being …
Novel Mixing Nozzles for Supersonic Chemical Oxygen Iodine …
Supersonic chemical oxygen-iodine laser (COIL) with an advanced mixing nozzle is studied. The mixing nozzle consists of a staggered arrangement of thin wedges lying across the flow duct.
Chemical oxygen — iodine laser with mixing of supersonic …
The mixing efficiency for supersonic injection of iodine is found to be much larger than for transonic injection, the maximum values of the gain being approximately 0.65 percent/cm for both ...
Development of Hybrid Simulation for Supersonic Chemical Oxygen-Iodine
The developed model is applied to the X-wing-type supersonic mixing chemical oxygen–iodine laser, which we have developed, and the calculated gain and output power are compared with the experimental results. ... DOI: 10.2514/1.20339 A numerical simulation method for a supersonic chemical oxygen–iodine laser is developed. The …
Comparison Study of Subsonic and Transonic Mixing in a …
The present study compares the laser medium properties for subsonic and transonic iodine injection schemes of a multi-kW grid-nozzle supersonic chemical oxygen iodine laser (COIL). Two supersonic nozzles of similar geometry having subsonic or transonic iodine injectors were investigated in the present study. Small signal gain …
Supersonic mixing enhanced by cavity-induced three …
Supersonic mixing is of great practical importance in engineering applications such as the scramjet engine combustor (Seiner et al. 2001) and chemical oxygen iodine laser (COIL) (Noren et al. 2011).In these applications, it is essential for the injectant to be mixed rapidly into the primary flow.