Preliminary Tests of Determination of Surface Catalytic Effect on Ultra High Temperature Ceramics
Method of experimental determination of the surface catalytic recombination coefficient of ultra high temperature ceramics(ZrB2+SiC) in dissociated subsonic air flows generated by a 60 kW high frequency plasma wind tunnel of CARDC are discussed. The complex diagnostics of nonequilibrium plasma flow was also developed for calculating air flow field parameter in working chamber of HF-plasmatron. The UHTC samples tested was produced by hot pressing, and then machined into samples for catalytic measurement. The sample for the test is disk shape with 20mm diameter and 5mm thickness. One types of materials were tested under a subsonic condition with enthalpy of 16.5~25.6MJ/kg and ambient pressure of 5.4, 12.4, 22.4kPa. The recombination coefficient of ultra high temperature ceramics (UHTC) in the surface temperature range 1406-1622 K were measured. It shows that the catalytic recombination coefficient of ultra high temperature ceramics under high surface temperature condition depends not only on the surface temperature but also on the partial pressure.
high frequency plasma wind tunnel catalytic recombination coefficient UHTC non-equilibrium plasma flow
LIU Li-ping WANG Guo-ling ZHANG Jun MA Hao-jun Tang Fei XIN Ying-li
Hypervelocity Aerodynamics Institute of China Aerodynamics Research & Development Center, Mianyang,621000, P. R. China
国际会议
上海
英文
104-110
2011-11-21（万方平台首次上网日期，不代表论文的发表时间）