摇摆条件下自然循环复合型脉动的同步化分析

Synchronization analysis of natural circulation complex pulsation under rolling motion

针对摇摆条件下自然循环系统流动不稳定性的同步化现象及其机理进行了分析.在实验研究的基础上,研究了摇摆运动引起的波谷型脉动与密度波型脉动的耦合现象.研究结果表明:在一定工况下,摇摆条件下的自然循环系统是线性振子与非线性振子的耦合系统,其中波谷型脉动是线性振子,密度波型脉动是非线性振子.当线性振子或非线性振子两者之一起主要作用时,系统频率锁频到线性振子的频率上或非线性振子频率上,使自然循环系统会发生同步化现象.

The synchronization phenomenon and mechanism of the flow instability of a natural circulation system un- der rolling motion are studied. The coupling effect of trough-type pulsation caused by rolling motions and dense wave pulsation is explored based on findings of prior experimental results. Based on the results, the natural circula- tion system under rolling motion can be viewed as a coupling system of linear oscillator （ trough-type pulsation） and non-linear oscillator （dense wave pulsation）. The synchronization phenomenon will occur when either linear oscil- lator or non-linear oscillator acts mainly, during which the frequency will be locked on the linear oscillator frequen- cy or non-linear oscillator.