Flow field analysis of annular hylte nozzle array without base purge
基区无吹氦环柱型高超音速低温喷管流场分析

The annular Hypersonic Low Temperature (HYLTE) nozzle array is a gain generator of cylindrical high power chemical lasers. In this paper, a novel design of HYLTE nozzle without base purging is presented. Based on 3D Navier-Stokes equations and the realizable k-\varepsilon model, the multi-species reacting flow field of the annular HYLTE nozzle is calculated. The numerical simulation results show that eddies along the flow direction and highly twisted contact surfaces between fuel and oxidizer are major factors for rapid mixing and reacting rate of HYLTE. Multi spectra laser outputs are compared between the old HYLTE nozzle design and the new one, which shows that with the new HYLTE design, a total of 3kW output power can be extracted from 1g F atom reacting gas by BCAR resonator, howerver, only 1.6kW can be extracted with the old design. In addition, the new design not only simplifies the fabrication of the complex HYLTE nozzle, but also reduces the consumption of He used in the high-energy chemical DF laser.