Supersonic diffuser for pressure recovery in SCOIL system

✍ Scribed by Gaurav Singhal; Mainuddin; R. Rajesh; R.K. Tyagi; A.L. Dawar

• Book ID: 103875720
• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 645 KB
• Volume: 42
• Category: Article
• ISSN: 0030-3992
• DOI: 10.1016/j.optlastec.2009.06.009

✦ Synopsis

Classical supersonic chemical oxygen iodine laser (SCOIL) systems operate under a low total pressure of nearly 18 Torr (2400 Pa) with cavity pressure being in the range 3 Torr (400 Pa) and Mach number of 1.7. These systems handle high flow rates and hence an efficient supersonic diffuser (SD) is a critical first step towards an open-cycle operation, which may be followed by a multi-stage ejector system. The present study discusses the various aspects in the design of a supersonic diffuser for a twin 10 kW COIL module source which employs flow rates of 100 gs À1 in each module. The results of computational studies based on 3-D, viscos compressible flow, k-e turbulence formulation for the supersonic diffuser geometry have also been discussed. The experimental results from a single-module test of the supersonic diffuser show that a total recovered pressure of nearly 7 Torr is achieved at the diffuser exit.