11 October 2005 Development of compact high pressure COIL
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Abstract
An advanced nozzle, also known as ejector nozzle, suitable for a 500 W class COIL employing an active medium flow of nearly 12 gm/s has been developed and used instead of conventional slit nozzle. The nozzle has been tested in both cold as well as hot run conditions of COIL achieving a typical cavity pressure of nearly 10 torr, pitot pressure of ~ 85 torr and a cavity Mach number of ~2.5. The present study details the gas dynamic aspects and detailed numerical studies of this ejector nozzle and highlights its potential as a COIL pressure recovery device. This nozzle in conjunction with a diffuser is capable of achieving pressure recovery of ~ 60 torr, equivalent to the much cumbersome first stage of the pressure recovery system used in case of conventional slit nozzle based system. . Thus use of this nozzle in place of conventional slit nozzle can achieve the atmospheric discharge using single stage ejector system thereby making the pressure recovery system quite compact.
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Gaurav Singhal, R. Rajesh, Mainuddin, R. K. Tyagi, A. L. Dawar, P. M. V. Subbarao, M. Endo, "Development of compact high pressure COIL", Proc. SPIE 5958, Lasers and Applications, 59581D (11 October 2005); doi: 10.1117/12.639912; https://doi.org/10.1117/12.639912
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