赵伟国,赵国寿,咸丽霞,韩向东.离心泵叶片表面布置障碍物抑制空化的数值模拟与实验[J].农业机械学报,2017,48(9):111-120.
ZHAO Weiguo,ZHAO Guoshou,XIAN Lixia,HAN Xiangdong.Effect of Surface-fitted Obstacle in Centrifugal Pump on Cavitation Suppression[J].Transactions of the Chinese Society for Agricultural Machinery,2017,48(9):111-120.
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离心泵叶片表面布置障碍物抑制空化的数值模拟与实验   [下载全文]
Effect of Surface-fitted Obstacle in Centrifugal Pump on Cavitation Suppression   [Download Pdf][in English]
投稿时间:2017-01-05  
DOI:10.6041/j.issn.1000-1298.2017.09.014
中文关键词:  离心泵  障碍物  空化抑制  数值模拟
基金项目:国家自然科学基金项目(51269011)
作者单位
赵伟国 兰州理工大学 
赵国寿 兰州理工大学 
咸丽霞 兰州理工大学 
韩向东 兰州理工大学 
中文摘要:以一台比转数为32的低比转数离心泵作为研究模型,提出了一种在叶片工作面加障碍物的方法来抑制空化初生及发展的方法。在不同空化数下,采用修正的SST k-ω湍流模型和Kubota空化模型对模型泵叶片表面在有、无障碍物条件下进行三维非定常数值模拟,结果表明:低比转数离心泵在有障碍物运行时扬程下降在5%以内,效率下降在3%以内,设计点扬程下降3%,效率下降1.2%。障碍物可以有效增大叶片近壁湍动能,改变压力分布,对离心泵内各个阶段空化均有抑制作用。障碍物可以优化流场结构,削弱靠近叶片背面的旋涡强度,对靠近隔舌区域的叶片工作面和背面作用效果明显。有障碍物时离心泵叶轮内空泡体积在空化各个阶段均小于无障碍物时叶轮内空泡体积,在空化发展阶段,障碍物使空泡体积持续衰减。空泡尺度发展到障碍物位置时,障碍物可以较大程度减低压力脉动主频幅值,对流场优化产生最佳效果,在空化发展其他阶段,障碍物会对叶轮内压力脉动造成小幅扰动。
ZHAO Weiguo  ZHAO Guoshou  XIAN Lixia  HAN Xiangdong
Lanzhou University of Technology,Lanzhou University of Technology,Lanzhou University of Technology and Lanzhou University of Technology
Key Words:centrifugal pump  obstacle  cavitation suppression  numerical simulation
Abstract:Centrifugal pumps are widely used to deliver liquid media in agriculture, pharmacy, industry, petrochemical industry, etc. Compared with the case delivering pure liquid such as water, centrifugal pumps not only have lower efficiency but also are subject to severe vibration, noise and erosion when delivering cavity two-phase flow, leading to the deterioration of flow field and even the shortage of service life. The cavitation flow in centrifugal pump performs strong instabilities, thus a method of a tiny obstacle fitted on the blade surface was proposed to suppress the cavitation development on a ns=32 model pump. The unsteady cavitation flow varied with cavitation number in centrifugal pump was simulated by modified SST k-ω turbulence model combined with Kubota cavitation model. The results showed that the head of centrifugal pump with obstacle was decreased within 5% at various flow rate and within 3% at design point, the efficiency was decreased within 3% at various flow rate and 1.2% at design point, the head with obstacle was great improved when cavitation flow developed. The obstacle can enhance the turbulent kinetic energy near the blade wall and reset the absolute pressure distribution, which can suppress the cavitation at different stages in centrifugal pump. The obstacle can optimize the flow structure and degrade the vortex intensity near the suction side of blade especially the area close to the tongue. The obstacle can decrease the cavity volume at varied cavitation number and the cavity volume keep attenuating when cavitation developed. The obstacle can cause small magnitude of the disturbance on the pressure frequency spectrum. The effects of cavitation suppression were optimal when the bubbles reached close to the obstacle.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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