低过冷流场中蒸汽水下喷注直接接触冷凝声学特性研究  

Investigation on Acoustic Characteristic of Direct Contact Condensation of Steam Injected into Water under Low Sub-cooled Water

作　　者：李勇[1] 林原胜[1] 肖颀 王苇[1] 李少丹[1] 魏志国[1] LI Yong;LIN Yuansheng;XIAO Qi;WANG Wei;LI Shaodan;WEI Zhiguo(Science and Technology on Thermal Energy and Power Laboratory,Wuhan Second Ship Design and Research Institute,Wuhan 430205,China)

机构地区：[1]武汉第二船舶设计研究所热能动力技术重点实验室,湖北武汉430205

出　　处：《原子能科学技术》2020年第8期1395-1402,共8页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目(51706159,51706158)。

摘　　要：低过冷流场中蒸汽水下喷注直接接触冷凝(DCC)是核动力舰船冷凝器热井鼓泡除氧的热力基础,该过程涉及强湍动、相变、多相流等复杂行为,可诱发强烈的流场压力脉动与辐射噪声,是影响舰船声隐身性能的重要因素。针对该问题,本文通过实验对流场过冷度2.8~14.7℃范围内蒸汽水下喷注DCC过程的汽羽流型演化和声学特性进行研究。结果表明,蒸汽质量流速和流场过冷度对汽羽流型演化具有不同的作用机制和影响规律。低过冷流场中,蒸汽水下喷注冷凝噪声具有宽频特征;流场过冷度极低时,低频噪声占辐射噪声的主导地位,随流场过冷度的增大,高频噪声的贡献逐渐提升。Bubbling deaeration is widely applied in marine steam power system(MSPS),and direct contact condensation(DCC)of steam injected into water under low sub-cooled water is the thermodynamic foundation of this technology.The deaeration process involves complex thermal and hydraulic behaviors,such as violent turbulence,interfacial mass transfer,and multiphase flow etc.,which induce significant pressure fluctuation and radiated noise.And it is an important element affecting the acoustic stealthiest of marine.In this paper,the two-phase flow regimes and acoustic characteristics of DCC of steam injected into water were studied for sub-cooled temperature ranging from 2.8℃to 14.7℃.It is found that both the steam mass flux and the sub-cooled temperature have significant influences on steam plume behaviors.Wide-band noise was observed during the low sub-cooled DCC process.Low-frequency component occupies the dominant position of radiated noise at very low sub-cooled temperature conditions.The contribution of high-frequency noise increases gradually with sub-cooled temperature.

关 键 词：低过冷流场 直接接触冷凝 汽羽流型 声学特性 

分 类 号：TL33[核科学技术—核技术及应用]