The performance of a propulsion system is directly proportional to its operatingtemperature therefore, an optimum operation regime will undoubtedly generateintense thermal loads on system components. If the system is designed for reusabilityand/or long range missions, it may be necessary to perform active cooling of criticalcomponents to prevent premature failure of the system. One such method is filmcooling, in which a layer of relatively cool gas is injected near the surface to beprotected. This work describes the use of minimally intrusive diagnostics tocharacterize the kinematics, thermal dynamics and heat transfer of slot film coolingflows over a wide range of blowing ratios, generating a comprehensive database fordetailed analysis, as well as for further use by model developers.
盐酸、硝酸、硫酸、磷酸:分析纯,;二氯化锡:分析纯,;重铬酸钾基准物质:纯度不小于 99.96%,;二苯胺磺酸钠、六水硫酸亚铁铵:分析纯,;碲粉:分析纯,纯度不小于 99.99%,;实验用水为二级水。1.2 溶液配制二氯化锡溶液:250 g/L,称取二水合氯化亚锡25 g 于 150 mL 烧杯中,加入盐酸溶液 (1+2) 溶解,并用盐酸溶液 (1+2) 稀释至 100 mL。硫磷混酸溶液:将 15 mL 硫酸缓慢加入 70 mL水中,搅拌冷却后再加入 15 mL 磷酸。重铬酸钾标准滴定溶液:c(1/6 K2Cr2O7)=0.1mol/L,称取 4.903 0 g 预先于 120℃恒重的基准重铬酸钾,置于 200 mL 烧杯中,用少量水溶解后,移至 1 000 mL 容量瓶中,以水稀释至标线,混匀。硫酸亚铁铵标准滴定溶液:0.1 mol/L,称取39.2 g 硫酸亚铁铵[(NH4) 2 Fe(SO4) 2 · 6H2O],用 300mL 硫酸溶液 (1+5) 溶解,移至 1 000 mL 容量瓶中,用水稀释至标线,混匀。二苯胺磺酸钠溶液:10 g/L,称取二苯胺磺酸钠 0.5 g 于 100 mL 烧杯中,加水溶解并稀释至 50mL。碲试验溶液:10 mg/mL,称取 1.000 0 g 碲粉于250 mL 锥形烧杯中,加入 40 mL 硝酸溶液 (1+1),低温加热溶解,待完全溶解后,取下冷却至室温,移至100 mL 容量瓶中,用水稀释至标线,混匀。移取 10.00 mL 上述碲溶液于 250 mL 锥形烧杯中,按表 1 加入 Cu,Se,Pb,As,Sb,Bi,Ag 等共存元素配成相应的合成试液,加入 5 mL 硫酸,低温加热至冒白烟,取下冷却,用少量水吹洗表皿及杯壁,继续加热至冒白烟,取下冷却,用少量水吹洗表皿及杯壁。此溶液中含碲 100 mg。