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secondary nozzle
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  secondary nozzle
When the gas is expanded in the secondary nozzle to static temperature values corresponding to the conditions of free flight, an exact simulation of the latter is possible at an altitude H= 65 to 70 km (u= 7.5 km/s, M = 20 to 25).
      
The air-liquid mixture shall then be discharged into the secondary nozzle and, hence horizontally into the basin.
      
In addition, primary and secondary jet velocity and turbulence components were measured at the centre of primary and secondary nozzle exits.
      


The secondary mass flowrate of the HYLTE nozzle in DF/HF chemical lasers was numerically and theoretically calculated, the mass flowrate coefficients of D2,H2 and He with 0.01~0.4MPa stagnation pressure and 0.1~0.9mm height of the half throat are obtained. The changerules of mass flowrate coefficient with stagnation pressure and half throat's height were got, the functions deduced from these rules were of satisfactory preciseion. As a result, some suggestions are presented on the design and maintenance...

The secondary mass flowrate of the HYLTE nozzle in DF/HF chemical lasers was numerically and theoretically calculated, the mass flowrate coefficients of D2,H2 and He with 0.01~0.4MPa stagnation pressure and 0.1~0.9mm height of the half throat are obtained. The changerules of mass flowrate coefficient with stagnation pressure and half throat's height were got, the functions deduced from these rules were of satisfactory preciseion. As a result, some suggestions are presented on the design and maintenance of secondary nozzle.

 对DF/HF化学激光器HYLTE喷管的副喷管质量流量进行了数值和理论计算,得出入口滞止压力在0.01~0.4MPa之间、喉道半高度在0.1~0.9mm之间的喷管的氘气,氢气和氦气质量流量系数,总结出质量流量系数随入口滞止压力和喉道高度的变化规律,并给出拟合公式,为副喷管的设计提供依据。

 
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