火箭推进

为了研究三叶片两级诱导轮的气蚀性能,通过试验获取了诱导轮的水力性能和气蚀性能曲线,观察了两级诱导轮的气蚀发展变化情况,分析了其内部的压力脉动现象,并与单级诱导轮进行了对比。结果表明:两级诱导轮能减小初生气蚀数,降低同步旋转气蚀的强度,但在1.1 Qd和设计流量Qd工况下,两级诱导轮发生了频率为21 Hz的径向不稳定现象。

In order to study the cavitation performance of a two-stage inducer with three-blades, the hydraulic and cavitation performance in two-stage inducer were obtained through experiments. In addition, the cavitation development was observed with visualization tests, and the pressure fluctuation inside the inducer passage was investigated by Fast Fourier Transformation and compared with single-stage inducer. The results show that the two-stage inducer can improve the cavitation performance by reducing the incipient cavitation number and decreasing the intensity of synchronous rotating cavitation. However, under the conditions of design flow Qd and 1.1 Qd, a radial instability with a frequency of 21 Hz occurred in the two-stage inducer.

引言
1 研究对象
2 试验方法
3 试验结果与分析
4 结论

表1 第一级诱导轮参数<br/>Tab.1 Main parameters of the first-stage inducer

表1 第一级诱导轮参数
Tab.1 Main parameters of the first-stage inducer

图1 两级诱导轮
Fig.1 Two-stage inducer

图2 诱导轮的水力性能<br/>Fig.2 Hydraulic performance of the inducer

图2 诱导轮的水力性能
Fig.2 Hydraulic performance of the inducer

图3 诱导轮气蚀性能<br/>Fig.3 Cavitation performance of the inducer

图3 诱导轮气蚀性能
Fig.3 Cavitation performance of the inducer

表2 气蚀性能曲线阶梯点扬程下降百分比<br/>Tab.2 Head drop percentage of the step point in cavitation performance curve

表2 气蚀性能曲线阶梯点扬程下降百分比
Tab.2 Head drop percentage of the step point in cavitation performance curve

图4 原诱导轮与两级诱导轮的初生气蚀<br/>Fig.4 Inception cavitation of original inducer and two-stage inducer

图4 原诱导轮与两级诱导轮的初生气蚀
Fig.4 Inception cavitation of original inducer and two-stage inducer

表3 两级诱导轮的初生气蚀数与原诱导轮对比<br/>Tab.3 Comparison of inception cavitation number between original inducer and two-stage inducer

表3 两级诱导轮的初生气蚀数与原诱导轮对比
Tab.3 Comparison of inception cavitation number between original inducer and two-stage inducer

图5 设计流量Qd下两级诱导轮入口压力的瀑布图<br/>Fig.5 Waterfall plot of inlet static pressure fluctuation of two-stage inducer under design flow Qd

图5 设计流量Qd下两级诱导轮入口压力的瀑布图
Fig.5 Waterfall plot of inlet static pressure fluctuation of two-stage inducer under design flow Qd

图6 1.1Qd下两级诱导轮入口压力的瀑布图<br/>Fig.6 Waterfall plot of inlet static pressure fluctuation of two-stage inducer under 1.1Qd

图6 1.1Qd下两级诱导轮入口压力的瀑布图
Fig.6 Waterfall plot of inlet static pressure fluctuation of two-stage inducer under 1.1Qd

图7 0.8Qd下两级诱导轮入口压力的瀑布图<br/>Fig.7 Waterfall plot of inlet static pressure fluctuation of two-stage inducer under 0.8Qd

图7 0.8Qd下两级诱导轮入口压力的瀑布图
Fig.7 Waterfall plot of inlet static pressure fluctuation of two-stage inducer under 0.8Qd

表4 不同流量下同步旋转气蚀引起的最大压力脉动幅值对比<br/>Tab.4 Amplitude comparison of maximum pressure fluctuation caused by synchronous rotating cavitation under different flow rates

表4 不同流量下同步旋转气蚀引起的最大压力脉动幅值对比
Tab.4 Amplitude comparison of maximum pressure fluctuation caused by synchronous rotating cavitation under different flow rates

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备注

引言

1 研究对象

2 试验方法

3 试验结果与分析

4 结论

期刊信息