CAJ | 학술논문

设计水平激波管－加速直管段－装载室－尾喷嘴组合装置，利用动态压力测量和高速摄影技术，实验研究了不同尾喷嘴类型、颗粒直径、马赫数和装载比下伴随激波和微米级稠密固体颗粒相的气固两相流现象和颗粒加速规律。得出：（①稠密颗粒相时，喷嘴类型对颗粒群加速效果排序可能为扩张型＞收缩型＞缩放型，与稀颗粒相情形不同，必须考虑激波衰减、颗粒团聚、壁面摩擦和颗粒拥堵的影响；②直径越大，颗粒加速效果越好，不能以单颗粒直径估计曳力大小，须考虑颗粒团聚的影响；③激波马赫数越大，颗粒群加速效果越好；④颗粒装载比较小时，颗粒群在收缩喷嘴内的加速效果较好，但装载比达到一定程度后，其进一步增大影响不大。
설계수평격파관－가속직관단－장재실－미분취조합장치，이용동태압력측량화고속섭영기술，실험연구료불동미분취류형、과립직경、마혁수화장재비하반수격파화미미급주밀고체과립상적기고량상류현상화과립가속규률。득출：（①주밀과립상시，분취류형대과립군가속효과배서가능위확장형＞수축형＞축방형，여희과립상정형불동，필수고필격파쇠감、과립단취、벽면마찰화과립옹도적영향；②직경월대，과립가속효과월호，불능이단과립직경고계예력대소，수고필과립단취적영향；③격파마혁수월대，과립군가속효과월호；④과립장재비교소시，과립군재수축분취내적가속효과교호，단장재비체도일정정도후，기진일보증대영향불대。
Aiming at the issues of the gas-solid two-phase flow phenomena,which are accompanied by shock waves and under the condition of dense solid phase composed of micron particles,and for the sake of making clear the acceleration performance of particles,a series of experiments were conducted to investigate the influences of the key parameters including type of tail nozzles,mean diameter of particles,shock Mach number and loading ratio of particles. In these experiments,a composite setup,consisting of end-to-end connections of a horizontal shock tube,a constant-section straight tube,a particle loading room and a tail nozzle,was employed and furnished with the instruments of dynamic pressure measurement and high-speed photography.The results are summarized that in event of dense particle phase,the priority of acceleration performance of particles in different types of tail nozzles could be ranked as:the first is in a divergent nozzle,the second is in a convergent nozzle,and the last is in a convergent-divergent one,that is of difference from that under the condition of dilute particle phase.Therefore,it should be taken into account that the influences of possible attenuation of incident shock wave,agglomeration of particles,friction force on nozzle wall and blockage of particles on the acceleration performance of particles.Greater diameter of particles corresponds to a better acceleration effect,implying that the effect of agglomeration of particles should be considered for the evaluation of drag force other than the bare consideration of the diameter of a single particle.The acceleration performance of particles is better for a larger shock Mach number.The acceleration performance of particles in a convergent nozzle decreases as the increase of loading ratio,however,no response on acceleration performance of particles would happen to a further increase of loading ratio after loading ratio reaches a certain value.