氦气流动特性的初步研究  

Study on flow characteristics of helium

作　　者：辛小鹏[1] 孙聿峰[2] 邵雪明[1] 陈佩[2] 

机构地区：[1]浙江大学流体工程研究所,杭州310027 [2]哈尔滨工程大学动力与能源工程学院,哈尔滨150001

出　　处：《燃气轮机技术》2008年第4期40-45,共6页Gas Turbine Technology

摘　　要：使用计算流体力学方法,模拟了圆管内流动、圆柱绕流、孤立翼型、叶栅当量扩压器、平面叶栅,在氦气和空气两种工质下典型流场的流动。结果发现:在低马赫数下,雷诺数相同时,氦气和空气流场具有较大的相似性;氦气的运动粘性系数较大,其附面层发展较快,流速大,容易发生边界层分离;与空气相比,氦气总压损失系数大。由此得到启示:对于高温气冷堆氦气压气机的设计,要充分考虑氦气雷诺数小、流速大、容易发生分离的流动特性。并且给出了氦气流动特性的基本数据,可供进一步研究和工程使用。Flow of typical model was simulated separately with air and helium. It includes flow inside a circular tube,flow around a mounting cylinder ,isolated aerofoil, equivalent cascades diffuser and plane cascades. The results show that the flow fields of air and helium are similar under lowMaeh number when they are in the same Reynolds. Helium has a high kinetic viscosity coefficient and it flows faster. The boundary of helium is easily separated because its boundary layer grows faster. The total pressure loss coefficient of helium is bigger than air. Therefore, the design of helium compressor incorporated with high temperature gas - cooled reactor should comsider that the Reynolds of helium is samll, the velocity of flow is fast and it is easily to separate.Furthermore basic data of helium is provided, we can make good use of it.

关 键 词：氦气 雷诺数 边界层分离 流动特性 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]