Pressure recovery system for a high-power HF/DF laser: implementation practice

A pressure recovery system for chemical oxygen-iodine laser based on an active diffuser

“…As the ejecting gas, in the AD cold air was used, and in the ejector, a mixture that was obtained, in a steam-gas generator, from the combustion products of a fuel composition alcohol + air and water vapor at Т 0 = 1400 K. The used steam-gas generators were similar in design and characteristics to those described in [2,5]. As in the pressure recovery systems of HF/DF lasers, those generators were operated in a two-stage regime: the ejectors were started at enhanced values of the mass rates of the gas flows (i. e., at a high pressure in the steam-gas generators), and then, after the EJ was started, the pressure in the steamgas generators was reduced by half the initial value, to the working level.…”

“…Like in [5], the gas-dynamic stoppage of the ejector was achieved by feeding an intense air flow through special collectors installed in each channel upstream of the ejector, one or two seconds before the steam-gas generators were stopped.…”

“…The control and data acquisition system of the experimental facilities was similar to that described in [5]. Pressure measurements were carried out using MIDA sensors, capable of ensuring 0.5-% accuracy in a broad range of measurements.…”

“…Here, the numerical model should be verified, which task often requires performing tests on model setups. The final stage is adjustment and alignment activities during which problems relating to setup starting and stoppage are to be solved, and the range of optimal regimes for the implemented supersonic chemical laser is to be determined (for more detail, see [5,6]). Below, data illustrating, with an example of COIL PRS, all development stages of a complex gas-dynamic setup are reported.…”

“…According to the above design strategy for gas-dynamic setups [5,6], at the initial stage we evaluated the geometric dimensions of AD using one-dimensional theory and, then, simulation of the 3D flow in the diffuser channel was performed. The calculations were carried out for various AD configurations that differed in the way the constriction was implemented and in the constriction ratio value, in the amount and type of used pylons, and in the rate of active gas flow.…”