| 论文简介 |
Condensation oscillation of steam jet is of high importance for industrial facility. In this study, the mechanism and propagation characteristic of the second dominant frequency is investigated. Firstly, the second dominant frequency is found under all the test conditions based on frequency spectrum. The second
dominant frequency decreases with the rise of water temperature and steam mass flux. Then, the second
dominant frequency is proved to be generated by the separated steam bubbles oscillation based on the
bubble oscillation theory. And the theoretical oscillation frequency equation of separated steam bubble
is used to predict the second dominant frequency, the predicted deviation ranges from 17% to 6%.
Furthermore, the propagation characteristic of the second dominant frequency is investigated, and a theoretical propagation equation for the second dominant frequency is derived. Then, the axial and radial
distribution characteristic of oscillation amplitude and energy of the second dominant frequency are analyzed and researched. In the downstream flow field and the radial direction, the propagation characteristic of steam bubble oscillation wave is well corresponding to the predicted results. However, in the
upstream flow field, due to the effect of steam plume, the oscillation amplitude and energy of the second
dominant frequency attenuate rapidly and the experimental data are much smaller than the predicted
value.
2015 Elsevier Inc. All rights reserve |
(创新港)
