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当前位置: 首页 > 文章 > 核主泵空化流动对能量转换的影响 排灌机械工程学报 2018 (5) 369-376
Position: Home > Articles > Effect of cavitation flow on energy transfer in nuclear main pump Journal of Drainage and Irrigation Machinery Engineering 2018 (5) 369-376

核主泵空化流动对能量转换的影响

作  者：
程效锐;符丽;包文瑞
单  位：
兰州理工大学能源与动力工程学院;甘肃省流体机械及系统重点实验室
关键词：
核主泵;空化流;能量转换;数值模拟
摘  要：
为研究核主泵内部空化流动对能量转换的影响,采用RNG k-ε湍流模型和Rayleigh-Plesset空化模型对设计工况下核主泵模型泵进行了全流场空化模拟,得到核主泵发生空化时叶轮内气泡分布规律.选取叶片吸力面的前盖板流线和后盖板流线,通过分析不同空化工况下这两条流线上的动扬程与静扬程变化规律,研究核主泵发生空化时,空化流动对叶轮内能量转换的影响.结果表明:核主泵内流体的能量主要由叶轮中后段提供,且从前盖板到后盖板,叶片做功能力逐渐减弱;空化干扰叶轮内流体流动,导致空化区域相对速度增大,压力减小,在气泡密集区域,叶片做功能力几乎为0;随着空化程度加剧,无空化区动扬程增大,静扬程减小,且静扬程减小幅度大于动扬程增大幅度,从而引起泵扬程和效率下降;随着空化程度加剧,动、静扬程突变程度加剧,增大了叶轮内的流动损失,进而导致泵扬程及效率进一步下降.
译  名：
Effect of cavitation flow on energy transfer in nuclear main pump
作  者：
CHENG Xiaorui;FU Li;BAO Wenrui;College of Energy and Power Engineering,Lanzhou University of Technology;Key Laboratory of Fluid Machinery and Systems,Gansu Province;
关键词：
nuclear main pump;;cavitation flow;;energy transfer;;numerical simulation
摘  要：
In order to study influences of cavitating flow on energy transfer in nuclear main pumps,the cavitating flow field in a nuclear main pump model was carried out under design condition using the RNG k-ε turbulence and Rayleigh-Plesset cavitation models,then vapour bubble distribution features in the impeller were attained. The influences of cavitating flow on the energy transfer in the impeller were studied under different cavitation conditions by analysing variations of fluid kinetic and static heads along the two streamlines on the shroud and hub. Results show that the energy of fluid is provided by the impeller in the middle and after-middle portions of blade,and the working capacity of blades decreases gradually from the shroud to the hub. Cavitation interfers with the flow in the impeller,leading to an increased relative velocity and a decreased pressure in cavities,and the working capacity of blades is almost zero in a zone with dense vapour bubbles. In non-cavitation zones,the kinetic head rises but the static head declines along the streamlines with the development of cavitation. Because the decrease in the static head is greater than the increase in the kinetic head,the pump headand efficiency have to be reduced. In addition,with the development of cavitation,the sudden change in both heads are intensified in the cavitation zones,resulting in an increased hydraulic loss in the impeller,eventually,the pump head and efficiency drop off even further.

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