摘要
为探究高温熔盐泵内部非稳态涡结构与压力脉动特性的关联性,构建熔盐泵与储盐罐全流道计算模型,基于RNG k-ε湍流模型的数值计算,对不同工况下泵内压力脉动频谱特征与涡结构演化规律进行分析.结果表明:由动静干涉引起的叶频(fBPF)、导叶频(fDPF)及其倍频信号在泵内压力脉动频谱中占主导,同时压力脉动程度随运行工况与测点位置差异显著.采用Q准则捕捉到导叶内部多种非稳态周期涡演化过程,包括尾缘脱落涡(2f_(R)~3f_(R))、吸力面脱落涡(3f_(R))等;关联分析可知涡结构演化核心区压力脉动程度显著增强,其特征频率与涡脱频率相一致,表明压力脉动与涡结构演化息息相关.研究结果为揭示熔盐泵内部非稳态流动激励特性及水力优化参考提供依据.
In order to explore the correlation between the unsteady flow structures and pressure pulsation in high-temperature molten salt pump for concentrating solar power(CSP)plants,a model of pump and the storage tank was constructed,the numerical calculation based on the RNG k-εturbulence model was carried out,and the characteristics of the pressure pulsation spectrum and the evolution of the vortex structure in different operating conditions were analyzed.The results show that rotor/stator interaction(RSI)stimulates blade passing frequency(f_(BPF))and diffuser passing frequency(f_(DPF))signals,which are dominated in pressure pulsation spectra.The pressure pulsation amplitude varies with the operating conditions and the positions in the pump.There are multiple evolutions of unsteady vortex structures captured by Q-criterion,respectively,including trailing edge shedding vortex(2f_(R)-3f_(R)),suction surface shedding vortex(3f_(R))and the like.Correlation analysis shows that the pressure pulsation amplitude of the vortex evolution region increases significantly,whose frequency is consistent with the vortex shedding frequency.The conclusion is that pressure pulsation is closely rela-ted to vortex structure evolution.The results provide a basis for revealing the unsteady flow excitation characteristics and hydraulic optimization in molten salt pump.
作者
高波
李超
倪丹
周文杰
陈金波
GAO Bo;LI Chao;NI Dan;ZHOU Wenjie;CHEN Jinbo(School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China)
出处
《排灌机械工程学报》
EI
CSCD
北大核心
2021年第4期338-344,共7页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家自然科学基金资助项目(51576090)
江苏省“六大人才高峰”资助项目(KTHY-060)
镇江市重点研发计划项目(GY2018023)。
关键词
高温熔盐泵
压力脉动
频谱分析
流动结构
high-temperature molten salt pump
pressure pulsation
frequency analysis
flow structure
