高压气体双孔浸没射流振荡频率特性研究  

Investigation on Pressure Oscillations Frequency for High Pressure Gas Double-hole Jet

作　　者：尹威凯 欧阳勇 崔旭阳 纪文英 谷海峰 YIN Weikai;OUYANG Yong;CUI Xuyang;JI Wenying;GU Haifeng(China Nuclear Power Technology Research Institute Co.,Ltd.,Shenzhen 518000,China;Fundamental Science on Nuclear Safety and Simulation Technology Laboratory,Harbin Engineering University,Harbin 150001,China)

机构地区：[1]中广核研究院有限公司,广东深圳518000 [2]哈尔滨工程大学核安全与仿真技术国防重点学科实验室,黑龙江哈尔滨150001

出　　处：《原子能科学技术》2024年第2期357-364,共8页Atomic Energy Science and Technology

基　　金：国家重点研发计划(2020YFB1901401)。

摘　　要：在沸水堆或小型堆中一般将抑压水池作为气体排放的热阱以实现安全壳压力的有效控制。基于这一背景,本文在不同过冷度下对高压气体双孔浸没射流振荡主频特性进行了一系列实验研究,其中不凝性气体份额为0.0~0.4,孔间距范围为1.5 d~3 d。实验结果表明,无论是纯蒸汽还是混合气,在双孔射流时两股气羽均表现出向中间汇聚的形态,甚至汇聚到一起形成联合射流,相较单孔射流而言双孔射流气羽尺度增大冷凝时间延长,所以其振荡主频更低。分析射流参数影响发现,纯蒸汽射流振荡主频随过冷度和孔间距的增加而增加。同时本文总结振荡主频影响规律提出了纯蒸汽射流主频的预测关系式,预测精度在-15%~20%之间。混合气体射流时(纯蒸汽+不凝性气体)振荡主频随过冷度和孔间距的增加而增加,与纯蒸汽射流主频变化规律一致。值得注意的是,混合气射流相较纯蒸汽而言振荡主频更低,并且主频随不凝气份额增加而降低。For boiling water reactors and small reactors,an effective way to reduce containment pressure is to discharge gas from the containment into the suppression pool.Based on the above background,a series of experiments were conducted to investigate the pressure oscillations frequency of steam-air gas discharged into a supercooled water pool.The air mass fraction was 0.0-0.4,and the hole pitch was 1.5 d-3 d.The air compressor and electric boiler generated air and steam,respectively.The steam and air were mixed and discharged into the supercooled water pool.A high-frequency dynamic pressure sensor was used at the nozzle outlet to record the pressure oscillation signal,and a high-speed camera captures jet plume images.The fast Fourier transform(FFT)was used to process the pressure signal,and the peak value of the frequency domain signal is the dominant frequency of the oscillation.The image observation reveals that in the case of a double-hole jet,the interference of the two gas plumes causes the gas plumes to converge or even agglomerate to form a combined jet.The dominant frequency of the double-hole jet is lower than that of the single-hole jet because of the increase in the dimension of the double-hole jet plume,which leads to a longer condensation time.Therefore,increasing the number of holes will result in a decrease in the dominant frequency of the oscillation,which may be closer to the equipment’s natural frequency and lead to resonance damage.For temperature effects,the condensation time of the plume is shorter as the subcooling increases,so the oscillation frequency increases with subcooling.For the effect of hole pitch,the dominant frequency increases with hole pitch.The water temperature between the two gas plumes decreases as the hole pitch increases,and the gas plumes condense faster and take less time to condense.Based on the research conclusions of the dominant frequency characteristics of the steam jet condensation,an empirical equation for predicting the dominant frequency was proposed,and the predic

关 键 词：混合气体 双孔射流 压力振荡 振荡主频 

分 类 号：TL33[核科学技术—核技术及应用]