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 ...

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.

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 …

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 …

The flow field of a supersonic flow chemical oxygen-iodine laser is simulated by solving the three-dimensional full Navier-Stokes equations, and the dependence of the mixing/reacting zone ...

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 ...

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 ...

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 …

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.

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 laser with supersonic mixing of iodine and oxygen. Authors: V. Rybalkin. A. Katz. B. D. …

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...

Mixing enhancement technique of supersonic chemical oxygen-iodine laser (COIL) is studied. The difficulty of supersonic mixing due to the compressibility of the fluid has been overcome by the introduction of streamwise vortex into the flow. The developed nozzle is a staggered array of wedges, looks like "X" letter from the side of the flow duct.

DOI: 10.1016/J.OPTLASTEC.2014.04.017 Corpus ID: 120782399; An experimental research on the mixing process of supersonic oxygen–iodine parallel streams @article{Zengqiang2014AnER, title={An experimental research on the mixing process of supersonic oxygen–iodine parallel streams}, author={Wang Zengqiang and Feng-ting …

The chemical oxygen-iodine laser (COIL) [] operates on the electronic transition of the I atom I(2 P 1/2)→I(2 P 3/2) and emits at 1315 nm.The complex kinetic, mixing and laser oscillation processes that take place in the reactive medium of the supersonic COIL can be described using either one-dimensional (1D) or three …

The injection and mixing of iodine vapor into a duct flow has been investigated experimentally and numerically. Laser-induced fluorescence has been used to visualize the progress of spreading of the iodine and its distribution homogeneity along the duct. Several injection methods, typical flow pressures for oxygen-iodine lasers, and various molar …

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.

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 …

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 …

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 ...

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 …

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 …

Abstract In this numerical study, the role of hyper-mixers on supersonic mixing is investigated for six different strut configurations. To this end, 3D, compressible, turbulent, non-reacting flow calculations with air as the secondary injectant have been carried out. A qualitative comparison of the predictions with experimental results is made …

DOI: 10.2514/6.1999-3429 Corpus ID: 100867447; An investigation of supersonic mixing mechanisms for the chemical oxygen-iodine laser (COIL) @inproceedings{Madden1999AnIO, title={An investigation of supersonic mixing mechanisms for the chemical oxygen-iodine laser (COIL)}, author={T. J. Madden and …

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 ...

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 to improve the resulting gain region is studied. The compressible Navier-Stokes equations with a detailed chemical kinetic model are solved by using a …

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.

We report on a detailed parametric study of an extremely efficient supersonic chemical oxygen-iodine laser (COIL) with supersonic mixing of iodine and oxygen. As a result of optimization of the supersonic mixing scheme, output power exceeding 0.6 kW with chemical efficiency of ~40% was obtained in a 5 cm gain length for Cl2 flow rate of ~17

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.