Reacting flow and pressure recovery processes in HF/DF chemical lasers

Pressure recovery in chemical lasers

“…+ n p¥l = pressure = cavity heat release = normalized heat release, Q/n p p 2 = gas constant = cavity mixture ratio, n sr>2 /n p p 2 = temperature = velocity = mole fraction, /i_////i/; X p = n p /n 3 , X s = n s /n 3 = mass fraction, myjmj -fluorine dissociation, 1/2 n pP /n p p 2 = deuterium dissociation, n 4D /n pF = specific heat ratio = laser specific power, (9^/m 3 understanding the fluid dynamic and chemical phenomena that govern power generation. A comprehensive review of this work is given by Warren.…”

“…Warren 3 pressure and partially at constant area; they also measured 200 Torr pitot pressures on a combustion-driven laser at the exit of a constant-area diffuser. Both studies indicate a constant-area cavity will provide better pressure recovery than will a constant-pressure cavity.…”

“…The laser power extracted is written in terms of the specific power (power extracted/mass flow), as G> f = n 3 M w3 a. The energy equation is then written as Substituting the expressions for n 3 …”

“…The flow at the inlet control surface is written as onedimensional and piecewise uniform and at the exit as onedimensional and uniform. The axial momentum equation is then given as 3 where the k index at station 3 refers to the three regions at this control surface, i.e., the fuel and oxidizer nozzle flows and the base area. The subscript / at station 4 indicates the cavity flow is inviscid; the exit flow area A 4I is less than the geometric flow area A 4 by A 6 *, the area displaced by the cavity boundary layers.…”

An Investigation of Turbulent Mixing in the Chemical Laser Using Holographic Imagery.

“…Some systems have been operated with fully viscous nozzle flows; that is, with a significant degradation of centerline total head. 3 The flows exiting from the individual nozzles and injectors are confined, except near the edges of the nozzle injector bank, by the flows from the 4*' neighboring nozzles and injectors. Thus, the main flow is nearly a constant-* area process composed of a repetitive series of similar flows with short characteristic dimensions along the optical axis.…”