火箭推进

为确保液体火箭发动机离心泵叶轮(离心轮)安全可靠工作,提出了基于强度的最大“正”等效应力法和基于刚度的双切线法两种失效判别准则以进行离心轮极限转速分析,并开展了离心轮超速试验进行验证。结果表明:最大“正”等效应力法准确地预测了离心轮破裂起始位置和破坏形式,误差低于15%; 双切线法预测的屈服转速与试验结果符合较好,误差低于5%。对于塑性较好的离心轮结构,采用屈服转速替代破裂转速进行极限转速设计分析更利于实现低成本、高可靠性的设计目标。

In order to guarantee the safety and reliability of centrifugal impeller in the liquid rocket engine(LRE),two failure criterions,that is the maximum positive equivalence stress method for strength and the double tangent intersection method for stiffness,are proposed to compute the limit rotation speed of centrifugal pump impeller in LRE.The corresponding overspeed spin tests were conducted to verify and compare the above two failure criterions.The results show that the maximum positive equivalence method can correctly predict the initial position and form of the failure,whose relative error is less than 15%,and the double tangent intersection method has predicted the closest results compared to that of the spin testing,whose relative error is less than 5%.For the centrifugal impellers with high plasticity,the yield speed is selected instead of the burst speed for the limit speed design and analysis,which is more helpful for realization of the low cost and high reliability of design goals.

引言
1 极限转速分析方法
2 离心轮极限转速数值分析
3 离心轮超速试验验证
4 结论

图1 双切线法<br/>Fig.1 Double tangent intersection method

图1 双切线法
Fig.1 Double tangent intersection method

图2 离心轮结构<br/>Fig.2 Centrifugal pump impellers

图2 离心轮结构
Fig.2 Centrifugal pump impellers

表1 离心轮材料性能数据<br/>Tab.1 Material properties of centrifugal impeller

表1 离心轮材料性能数据
Tab.1 Material properties of centrifugal impeller

图3 额定转速下离心轮1等效应力<br/>Fig.3 Equivalence stress of impeller 1 at the rated speed

图3 额定转速下离心轮1等效应力
Fig.3 Equivalence stress of impeller 1 at the rated speed

图4 额定转速下离心轮1静水应力<br/>Fig.4 Hydrostatic stress of centrifugal impeller 1 at the rated speed

图4 额定转速下离心轮1静水应力
Fig.4 Hydrostatic stress of centrifugal impeller 1 at the rated speed

图5 离心轮1危险区域等效应力随转速变化规律<br/>Fig.5 Variation of equivalence stress in hazardous area of impeller 1 with speed

图5 离心轮1危险区域等效应力随转速变化规律
Fig.5 Variation of equivalence stress in hazardous area of impeller 1 with speed

图6 离心轮1特征点位移随转速平方变化曲线<br/>Fig.6 Variation of feature point displacement of impeller 1 with speed

图6 离心轮1特征点位移随转速平方变化曲线
Fig.6 Variation of feature point displacement of impeller 1 with speed

图7 额定转速下离心轮2等效应力<br/>Fig.7 Equivalence stress of centrifugal impeller 2 at the rated speed

图7 额定转速下离心轮2等效应力
Fig.7 Equivalence stress of centrifugal impeller 2 at the rated speed

图8 额定转速下离心轮2静水应力<br/>Fig.8 Hydrostatic stress of centrifugal impeller 2 at the rated speed

图8 额定转速下离心轮2静水应力
Fig.8 Hydrostatic stress of centrifugal impeller 2 at the rated speed

图9 离心轮2危险区域等效应力随转速变化规律<br/>Fig.9 Variation of equivalence stress in hazardous area of impeller 2 with speed

图9 离心轮2危险区域等效应力随转速变化规律
Fig.9 Variation of equivalence stress in hazardous area of impeller 2 with speed

图10 离心轮2特征点位移随转速平方变化曲线<br/>Fig.10 Variation of feature point displacement with speed for impeller 2

图10 离心轮2特征点位移随转速平方变化曲线
Fig.10 Variation of feature point displacement with speed for impeller 2

图11 离心轮超速试验安装状态<br/>Fig.11 Mounted status for overspeed spin testing of two centrifugal impellers

图11 离心轮超速试验安装状态
Fig.11 Mounted status for overspeed spin testing of two centrifugal impellers

图12 离心轮1超速试验升速曲线及振动位移曲线<br/>Fig.12 Speed-up and vibration displacement curves in overspeedtest of centrifugal impeller 1

图12 离心轮1超速试验升速曲线及振动位移曲线
Fig.12 Speed-up and vibration displacement curves in overspeedtest of centrifugal impeller 1

图13 高速相机拍摄到的离心轮1破裂过程<br/>Fig.13 Broken process taken by high-speed camera for centrifugal impeller 1

图13 高速相机拍摄到的离心轮1破裂过程
Fig.13 Broken process taken by high-speed camera for centrifugal impeller 1

图14 离心轮2超速试验升速曲线及振动位移曲线<br/>Fig.14 Speed-up and vibration displacement curves in overspeedteat of centrifugal impeller 2

图14 离心轮2超速试验升速曲线及振动位移曲线
Fig.14 Speed-up and vibration displacement curves in overspeedteat of centrifugal impeller 2

表3 超速试验与数值分析结果比较<br/>Tab.3 Comparison between overspeed test data and numerical analysis data

表3 超速试验与数值分析结果比较
Tab.3 Comparison between overspeed test data and numerical analysis data

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备注

引言

1 极限转速分析方法

2 离心轮极限转速数值分析

3 离心轮超速试验验证

4 结论

期刊信息

备注

引言

1 极限转速分析方法

2 离心轮极限转速数值分析

3 离心轮超速试验验证

4 结 论

期刊信息

4 结论