Numerical Study of Cavitation Effects of Electro-hydraulic Actuator System of FAST

doi:10.3969/j.issn.1004-132X.2021.02.007

Abstract

Abstract: Aiming at the problems of vibrations and noises in FAST electro-hydraulic actuator reliability growth tests, the Mixture multiphase flow model of CFD were used to establish the flow field and suction pipeline model of oil source in FAST electro-hydraulic actuator hydraulic system. According to the experimental data, the correctness of the model was verified. The pressure fluctuation and cavitation phenomena in the oil source were simulated. The results show that the cavitation may be significantly reduced by expanding suction pipeline when the suction pressure is less than 130 kPa; when the speed of the oil source is less than 3500 r/min, the change of the speed has little influence on the cavitation; when the speed is greater than 3500 r/min, the cavitation increases with the increase of the speed; Under the conditions of constant working pressure, with the increase of suction pressure, the cavitation phenomenon and pressure fluctuation decrease. Finally, the experiments of improved FAST electro-hydraulic actuator show that there is no vibration and the noise level is below 60 dB. The results provide a theoretical basis for judging the causes of cavitation in FAST and improving the reliability of FAST actuators.

Key words: five-hundred-meter aperture spherical radio telescope (FAST) electro-hydraulic actuator, oil suction pipe diameter, noise of hydraulic system, cavitation

摘要： 针对FAST电液促动器可靠性增长试验过程中出现的振动和噪声问题，采用计算流体力学（CFD）的Mixture多相流模型等，建立FAST电液促动器液压系统油源内部流场和吸油管路模型，依据试验数据验证了模型的正确性，并对油源内的压力脉动、空化现象进行仿真试验。结果表明：系统的吸入压力低于130 kPa时，扩大吸油管路直径可显著减少系统空化；油源转速低于3500 r/min时，转速变化对系统空化现象的影响较小，转速高于3500 r/min时，系统内的空化现象随着转速的增大而加剧；在转速和工作压力不变的条件下，随着吸入压力的增大，系统油源内部流场空化现象减弱，系统压力脉动减小。对扩大吸油管路直径后的FAST电液促动器进行试验，未出现振动现象，且噪声等级降至60 dB以下。研究成果为合理判断系统内空化产生的原因和提高FAST促动器的可靠性打下了理论基础。

关键词: FAST电液促动器, 吸油管径, 液压系统噪声, 空化

CLC Number:

TG156

QIN Yalu1,3;CAI Wei1,3;WANG Liugen1,3;LEI Zheng2;ZHAO Jingyi1,3;WANG Qiming2.

Numerical Study of Cavitation Effects of Electro-hydraulic Actuator System of FAST

[J]. China Mechanical Engineering, DOI: 10.3969/j.issn.1004-132X.2021.02.007.

秦亚璐1,3;蔡伟1,3;王留根1,3;雷政2;赵静一1,3;王启明2. 500m口径球面射电望远镜电液促动器系统空化影响的数值研究[J]. 中国机械工程, DOI: 10.3969/j.issn.1004-132X.2021.02.007.

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