SURFACE OIL FLOW TECHNIQUE AND LIQUID CRYSTAL THERMOGRAPHY FOR FLOW VISUALIZATION IN IMPULSE WIND TUNNELS

This paper describes flow visualization techniques employing surface oil flow and liquid crystal thermography suitable for use in impulse wind tunnels.High spatial resolution photographs of oil flow patterns and liquid crystal thermograms have been obtained within test times ranging from 7 to 500 ms and have been shown to be very useful for revealing the detailed features of 3-D separated flow.The results from oil flow patterns,liquid crystal thermograms,schlieren photographs and heat flux measurements are shown to be in good agreement.

Experimental Investigation of Hydrocarbon-fuel Ignition in Scramjet Combustor

The direct-connected supersonic combustor experiment is finished for kerosene fuel ignition in H_2/O_2 preheated impulse facility. The entrance parameter of combustor corresponds to scramjet flight Mach number 3.5. Kerosene ignition is realized by using hydrogen as pilot flame. Wall pressure distributions of combustion are measured and flame photographs of ultraviolet ray are got. Experiment indicates that it is very difficult for kerosene fuel to realize self-ignition at low entrance temperature (below 900K) in supersonic combustor. Hydrogen pilot flame is one of the efficient methods for realizing kerosene ignition.

滋阴祛风法对阴虚风燥型喉源咳嗽气道阻力的影响评价及止咳疗效的研究

目的:探讨滋阴祛风法对阴虚风燥型的喉源性咳嗽的临床疗效和对气道阻力的影响。方法:共收集了50例喉源性咳嗽病人,分为治疗组玄麦止咳颗粒剂30例和对照组急支糖浆20例,治疗组服用试验药品玄麦止咳颗粒剂,口服,用200mL开水融化并搅匀,分2次服,每日服2次;对照组服用对照药品急支糖浆,口服,每次10mL1日3次,连续服药7天为1个疗程,观察时间为1个疗程,以临床症状和肺功能检测气道阻力作为观察指标。结果:治疗组临床治愈率3.3%,显效率为53.3%,有效率为40%,无效率为3.4%,对照组分别为0%,5%,35%,60%,经过检验治疗组明显高于对照组,主要症状干咳、咽干、咽痒,临床治愈率、显效率、有效率、无效率,均优于对照组;治疗组能明显降低Zrs(呼吸道总阻抗)、R5(呼吸道总黏性阻力)、R20(中心气道的黏性阻力)、和近咽部黏性阻力R35,疗效优于对照组急支糖浆。结论:滋阴祛风法具有较好的止咳功效,可明显的降低上气道阻力。IOS测定可作为喉源性咳嗽临床诊断与疗效评估的客观指标。