| 陈霞,李忠义,王永生.表孔门槽的空化特性分析[J].水利学报,1998,29(9):0021-0028 |
| 表孔门槽的空化特性分析 |
| Cavitation characteristics of weir gate slot |
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| DOI： |
| 中文关键词: 表孔门槽 水力学 空化 |
| 英文关键词: weir gate slot hydraulics cavitation |
| 基金项目: |
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| 中文摘要: |
| 表孔门槽与二维凹槽在水力特性上有很大的差异，这决定了它们在空化特性上也有所不同.由于流动形式和堰面曲率的影响，表孔水流往往在堰面上压力低、流速高；在门槽底部，由于压差的作用，槽内旋涡常常随绕流从下游角隅绕出槽外.堰面、涡心以及绕流区的交汇，使压力剧烈下降，极易在门槽下游边墙底部发生混合型空化，其初生空化数远大于水洞中二维凹槽的初生空化数，应在设计中引起重视。 |
| 英文摘要: |
| The cavitation characteristics of weir gate slots are quite different from that of two dimensional cavity. The flow over a curved weir not only causes the considerable low pressure at the bottom, but also changes the cavitation pattern of the gate slot. The vortex is not always limited in the slot as it is in two dimensional situation, but is frequently pushed out at the bottom, and then turns around the cant, where the separated flow takes place. At the intersection of the vortex, the curved weir and the region of separation, the pressure drops down sharply, which accounts for the vulnerability to cavitation damage of this area. The incipient cavitation numbers of weir gate slots are much higher than those of two dimensional cavitation |
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