利用数值模拟与实验相结合的方法，在无反向流脉动条件下，分析脉动参数雷诺数Re、斯特劳哈尔数St及振动分率P对波纹管中流体的传热和阻力特性的影响。入口速度为脉动速度，入口温度设为300 K，出口设为自由出口，壁面采用恒温壁面，温度为350 K。研究表明：波纹管内流体处于层流状态时，随着Re的增大，传热强化幅度不断增大；流体处于湍流状态时，传热强化幅度随Re的增大而降低；随着St的增加，传热强化幅度增大；振动分率P对传热强化幅度的影响不明显；平均摩擦系数随着Re的增大而减小，随着振动分率P的增加而小幅度增大，在一个脉动周期内摩擦系数呈正弦规律变化，且随着St的增大发生明显变化，但平均值几乎不变。

Using the combination method of numerical simulation and experiment,under the condition of no reverse flow pulsation,the effects of pulsation parameters including Reynolds number Re,Strauhal number St and vibration fraction P on the heat transfer and resistance characteristics of fluid in bellows were analyzed.The inlet speed was pulsating speed,the inlet temperature was set to 300 K,the outlet was set to free outlet,and the wall adopts constant temperature wall with a temperature of 350 K.The results show that when the fluid in the bellows is in the laminar flow state,the heat transfer enhancement amplitude increases with the increase of Re continuously.When the fluid is in turbulent state,the heat transfer enhancement amplitude decreases with the increase of Re.With the increase of St,the heat transfer enhancement amplitude increases.The influence of vibration fraction P on heat transfer enhancement amplitude is not obvious.The average friction coefficient decreases with the increase of Re and increases slightly with the increase of vibration fraction P.The friction coefficient changes sinusoidally in a pulsating cycle,and changes significantly with the increase of St,but the average value hardly changes.

TK124

河北省高等学校科学技术研究重点项目（ZD2020169）