Choice of working parameters of pressure recovery systems for high-power gas flow chemical lasers

Malkov, V. M.; Борейшо, А. С.; Савин, А. В.; Киселева, И. А.; Orlov, A. E.

doi:10.1117/12.413965

Cited by 6 publications

(8 citation statements)

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“…The flow is much more complex due to the presence of the following features: (1) elongated rectangular cross-section; (2) vanes separating the whole cross-section; (3) mirror cavities; (4) boosters, shutters and others. Due to those distinctions the complex under-start behavior appears during the laser operation [1,2]. In COIL diffusers all these phenomena appears as well.…”

Section: Coil Supersonic Diffusermentioning

confidence: 99%

“…Therefore, Damkeller number for supersonic COIL AM flows is big enough. Quantitatively, assuming that the main heat source in the resonator cavity flow is the quenching of excited iodine atoms I*+H 2 …”

Section: Introductionmentioning

confidence: 99%

“…Residual chemical energy not converted to the laser radiation for COIL AM is bigger than the total translational enthalpy because of high energy efficiency as well as low total temperature of the AM. The corresponding thermal factor for nitrogen-based COIL can be estimated as (2), where Y res is residual yield and D means dilution ration. For typical COIL parameters θ~1.5÷2, as distinct from HF/DF lasers where the thermal factor is much closer to 1.…”

Section: Introductionmentioning

confidence: 99%

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Problems of COIL fluid dynamics

Boreysho¹,

Malkov²,

Савин³

2006

XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers

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Fluid dynamic processes in COIL medium represents considerable difference as compared with any other types of cw CL flows because of high Damkerrer number, high thermal factor as well as low Reynolds number. Experimental diagnostics of the COIL AM flowfields by traditional gas-dynamic measuring techniques is restricted due to low static pressure and chemical reactions. Therefore numerical simulation represents the main instrument for investigation. Numerical and experimental results as well as corresponding techniques and verification procedures are presented in the paper related to flows in two main parts of COIL: supersonic diffuser (SD) and nozzle bank (NB).

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Section: Coil Supersonic Diffusermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Problems of COIL fluid dynamics

Boreysho¹,

Malkov²,

Савин³

2006

XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers

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“…THE GENERAL APPROACH Some important applications of High Power Gas Flow and Chemical Lasers (HPGCL) are aimed to ground level operations. In spite of some known interest to supersonic mixing ejectors [4], all presented bellow data are related to traditional schemes.Characteristics ofthe supersonic laser gas mixture flows after DF and COIL cavities are given in [2]. It means that after the laser cavity their exhaust gases run out to the ambient atmosphere.…”

mentioning

confidence: 99%

“…HPGCL are understood here as open cycle machines. At this rate it is important to take into account such feature of the laser PRS operation, as a heat generation by exhaust laser gas mixtures in diffuser channels [2,5]. Exhaust gas products after resonator cavity cannot be evacuated directly to atmosphere.…”

mentioning

confidence: 99%

Pressure recovery systems for high-power gas flow chemical lasers

et al. 2001

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I. THE GENERAL APPROACH Some important applications of High Power Gas Flow and Chemical Lasers (HPGCL) are aimed to ground level operations. HPGCL are understood here as open cycle machines. It means that after the laser cavity their exhaust gases run out to the ambient atmosphere. Exhaust gas products after resonator cavity cannot be evacuated directly to atmosphere. The atmosphere pressure on the sea level exceeds the cavity pressure by 1 0 -20 times for CO2 gasdynamic lasers (GDL) and by 150 -200 times for chemical oxygen-iodine lasers (COIL). Combustion Driven CO2 GDL only can operate with-. . . . . . Pressure Recovery Systemout energy additions, using ordinary passive diffusers. However, and in these cases, the whole HPGCL system scale is determined, by the diffusers' dimensions. Meanwhile, the ground operation of High Power HF/DF-CL and COIL requires already "active" Pressure Recovery Systems (PRS): large-scale complexes, including diffusers and high-energy ejectors. Fig. 1 demonstrates a correlation between scales of the HF/DF-chemical laser and it pressure recovery system. Even without component supply subsystems (balloons, tanks, pipes, accessories, etc.) the scales are non-compared. For COIL the difference becomes more significant. Approximate estimates confirm also, that the ejecting gas flow rate of ejector stations may exceed the laser components' summary gas flow rate by many tens times [1].It changes seriously the general estimations the HPGCL effectiveness. There are some results of such calculations on Fig. 2. No doubt, that specific energetic effectiveness of the HF/DF-CL and COIL with and without the PRS components is to be very different.The HPGCL and PRS have to be considered as indivisible, strictly integrated systems. Their combined analysis, aimed to a search of optimal technical solutions, has to take into account many links and interactions, except ofthe additional expenditures ofenergy and components.The present papers contains a review of various technical concepts DF and schematic solutions aimed to practical uses for some real applications, Fig. 2 meanwhile, physical processes in the diffusers and supersonic ejectors of the HPGCL PRS are considered more precisely in the [2, 3]. II. DIFFUSERSIndependently on a pressure level into cavities, gas flows of all considered HPGCL are supersonic, therefore, the streams' kinetic energy may be applied for the PRS operation. However, this energy, is not enough for direct exhaust of the laser gases to ambient atmosphere. Hence, it is necessary providing of an energy addition to the stream with agency of ejector and compressor technologies. In spite of some known interest to supersonic mixing ejectors [4], all presented bellow data are related to traditional schemes.Characteristics ofthe supersonic laser gas mixture flows after DF and COIL cavities are given in [2]. Parameters of the laser flows are close enough, so, at least, from constructive point of view, diffusers for both types of the lasers have to be similar. A supersonic flow slowdown pr...

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