Performance comparison of supersonic ejectors with different motive gas injection schemes applicable for flowing medium gas laser
G. Singhal1, P.M.V. Subbarao2, Mainuddin3, R.K. Tyagi1, and A.L. Dawar1
1Laser Science and Technology Centre, Delhi, India
2Indian Institute of Technology, Delhi, India
3Jamia Millia Islamia, Delhi, India
E-mail: singhal_g@rediffmail.com
Keywords: chemical oxygen iodine laser, supersonic ejector, peripheral ejector, central ejector
Pages: 449–457
Abstract
A class of flowing
medium gas lasers with low generator pressures employ supersonic flows with low
cavity pressure and are primarily categorized as high throughput systems
capable of being scaled up to MW class. These include; Chemical Oxygen Iodine
Laser (COIL) and Hydrogen (Deuterium) Fluoride (HF/DF). The practicability of
such laser systems for various applications is enhanced by exhausting the effluents
directly to ambient atmosphere. Consequently, ejector based pressure recovery
forms a potent configuration for open cycle operation. Conventionally these gas
laser systems require at least two ejector stages with low pressure stage being
more critical, since it directly entrains the laser media, and the ensuing
perturbation of cavity flow, if any, may affect laser operation. Hence,
the choice of plausible motive gas injection schemes viz., peripheral or
central is a fluid dynamic issue of interest, and a parametric
experimental performance comparison would be beneficial. Thus, the focus is to
experimentally characterize the effect of variation in motive gas supply pressure,
entrainment ratio, back pressure conditions, nozzle injection position operated
together with a COIL device and discern the reasons for the behavior.
DOI: 10.1134/S086986431703012X
|