Chemical oxygen-iodine laser with CO2 buffer gas

The supersonic nozzles lower temperature to 170-180 K better for the small signal gain coefficient.But at this temperature, the CO 2 buffer gas may become liquid state. A chemical oxygen-iodine laser (COIL) employing CO 2 as buffer gas and no-flake-nozzle was studied. Some mathematical simulation in three-dimensional computation fluid dynamics was adopted first to validate its usability. New nozzles gave the temperature higher than 400 K and considerable small signal gain coefficient. In the same conditions as simulation, experiments gave a 23% of chemical efficiency and 2.5 kW of output power. And it have got rid of "black area", which was familiar in the supersonic COIL both in simulation and experimental results.

Section: Introductionmentioning

confidence: 99%

Research on COIL employing no-flake-nozzle and CO₂as buffer gas

Sang

Zhang

et al. 2015

“…[7,8,9] CO 2 is an attractive candidate for use as a buffer gas because of its chemical and physical characteristics. It can reduce the I 2 dissociation process by deactivating the intermediate electronically excited states of I 2 (A) and oxygen O 2 ( 1 Σ) molecules.…”

Section: Introductionmentioning

confidence: 99%

Chemical oxygen-iodine laser with a cryosorption vacuum pump with different buffer gases

Fang

Sang

et al. 2015

A traditional pressure recovery system is the major obstacle to mobile chemical oxygen-iodine laser (COIL) for its huge volume. A cryosorption vacuum pump was used as the pressure recovery system for different buffer gases. It made COIL become a flexible, quiet and pressure-tight.Experiments were carried out on a verti-COIL, which was designed for N 2 and energized by a square-pipe jet singlet oxygen generator (JSOG). The output power with CO 2 was 27.3% lower than that with N 2 , but the zeolite bed showed an adsorption capacity threefold higher for CO 2 than for N 2 in the continuous operation. The great volume efficiency interested researchers.Chemical oxygen-iodine laser, COIL, buffer gas, cryosorption vacuum pump, recovery syste

“…Azyazov et al [8] and Mingxiu Xu [9] had successful operated the COIL system that use CO 2 as buffer gas (CO 2 -COIL) with a high efficiency. The CO 2 -COIL effluent gases such as CO 2 , O 2 , Cl 2 , I 2 and H 2 O are easily chemically absorbed by solid sorbents.…”

Section: Introductionmentioning

confidence: 99%

Feasibility study of a novel pressure recovery system for CO₂-COIL based on chemical absorption

Jin

Zhang

et al. 2015

A chemical oxygen-iodine laser (COIL) is an electronic transition, low pressure, high throughput system. The use of this laser demands a suitable pressure recovery system. This paper proposed a novel pressure recovery system based on chemical absorption and the feasibility for COIL with CO 2 as buffer gas (CO 2 -COIL) was investigated. The novel pressure recovery system works by chemisorbing the CO 2 -COIL effluents into two fixed-beds maintained at initial temperature of around 293-323K. Compared with the cryosorption system for N 2 -COIL based on physical absorption, the novel chemisorptions based pressure recovery system has a simpler logistics and a shorter run-to-run preparation time.Two kinds of solid chemo-sorbents were designed and synthesized. One was used for chemisorbing the oxidizing gases such as O 2 ,Cl 2 and I 2 , another was used for chemisorbing the acidic gas such as CO 2 . The capacities of the two sorbents were measured to be 3.12 mmol(O 2 )/g and 3.84 mmol (CO 2 ) /g, respectively. It indicated that the synthesized sorbents could effectively chemosorb the CO 2 -COIL effluents. Secondly, analog test equipment was set up and used to study the feasibility of the novel pressure recovery system used for CO 2 -COIL. The test results showed that the novel pressure recovery system could maintain the pressure under 6 Torr for tens seconds under the continuous gas flow. It showed that the novel pressure recovery system for CO 2 -COIL based on chemical absorption is feasible.