气液两相入流条件下离心泵内部流动诱导特性实验研究
|
摘要
搭建了泵送气液两相流实验台,以比转速n_s=132.2的离心泵为模型进行气液两相入流条件下的流动诱导特性研究,获得了在不同进口含气率下的外特性和压力脉动、振动信号的频谱和概率密度图。研究结果表明:气液两相入流条件下,离心泵在小流量工况时的性能对气体更加敏感;模型泵在入流含气率超过8%以后,性能急剧下降且可测试的工况范围变窄并比较紊乱,能达到的最大入流含气率为10%;气液两相入流条件下,泵出口压力脉动主频仍为叶频,叶频处幅值随着进口含气率的增大而增大,含气率越大低频区的宽频特性越明显;压力脉动信号和振动信号均服从正态分布,随着进口含气率的不断增大,压力脉动的概率密度函数(PDF)幅值逐渐减小而压力幅值跨度逐渐变宽,振动的PDF幅值呈先增大,然后减小,在进口含气率为5%时达到最小(仍大于纯水工况),然后再增大的趋势,两者均可作为流态监测的重要依据。
A two-phase flow pumping test platform was built to study flow induced characteristics of a centrifugal pump under air-water two-phase inflow condition. The pump characteristics were measured when its ratio rotating speed ns=132.2. Under different flow rates and inlet air voids, the pump's outer characteristics, pressure pulsation, vibration signal frequency spectra and their probability density figures were obtained. The study results showed that the performance of the centrifugal pump is more sensitive to air under the conditions of small flow rate and air-water two-phase inflow; its performance drops sharply when inflow air void is more than 8%,and the range of working conditions that can be tested becomes narrower and more chaotic, the maximum air void of the pump can reach 10%; the main frequency of the pump outlet pressure pulsation is the blade frequency under air-water two-phase condition, vibration amplitude at the blade frequency increases with increase in inlet air void; the larger the inlet air void,the more obvious the broadband characteristics of the low frequency field; pressure fluctuation signals and vibration signals obey the normal distribution; with increase in inlet air void, the probability density function(PDF) amplitude of pressure pulsation decreases gradually, while its span becomes wider gradually; the PDF amplitude of vibration increases firstly and then decreases, and reaches the minimum when inlet air void is 5%, furthermore it has a rising trend; both pressure fluctuation and vibration variations can be used as important bases for flow state monitoring.
A two-phase flow pumping test platform was built to study flow induced characteristics of a centrifugal pump under air-water two-phase inflow condition. The pump characteristics were measured when its ratio rotating speed ns=132.2. Under different flow rates and inlet air voids, the pump's outer characteristics, pressure pulsation, vibration signal frequency spectra and their probability density figures were obtained. The study results showed that the performance of the centrifugal pump is more sensitive to air under the conditions of small flow rate and air-water two-phase inflow; its performance drops sharply when inflow air void is more than 8%,and the range of working conditions that can be tested becomes narrower and more chaotic, the maximum air void of the pump can reach 10%; the main frequency of the pump outlet pressure pulsation is the blade frequency under air-water two-phase condition, vibration amplitude at the blade frequency increases with increase in inlet air void; the larger the inlet air void,the more obvious the broadband characteristics of the low frequency field; pressure fluctuation signals and vibration signals obey the normal distribution; with increase in inlet air void, the probability density function(PDF) amplitude of pressure pulsation decreases gradually, while its span becomes wider gradually; the PDF amplitude of vibration increases firstly and then decreases, and reaches the minimum when inlet air void is 5%, furthermore it has a rising trend; both pressure fluctuation and vibration variations can be used as important bases for flow state monitoring.
引文
[1] 袁寿其,施卫东,刘厚林,等.泵理论与技术[M].北京:机械工业出版社,2014.
[2] 傅春.气液两相流动结构复杂性分析[D].天津:天津大学,2015.
[3] 陈次昌,刘正英,刘天宝,等.两相流泵的理论与设计[M].北京:兵器工业出版社,1993.
[4] PATEL B R,RUNSTADLER JR P W.Investigations into the two-phase flow behavior of centrifugal pumps[C]// Polyphase Flow in Turbomachinery,Proceedings of the Winter Annual Meeting.San Francisco,1978.
[5] KOSMOWSKI I.Behaviour of centrifugal pump when conveying gas entrained liquids[C]//7th Technical Conference of BPMA.York,1981.
[6] SEKOGUCHI K,TAKADA S,KANEMORI Y.Study of air-water two-phase centrifugal pump by means of electric resistivity probe technique for void fraction measurement:1st report,measurement of void fraction distribution in a radial flow impeller[J].Bulletin of JSME,1984,27(227):931-938.
[7] KIM Y T,TANAKA K,MATSUMOTO Y,et al.Characteristics and flow patterns of a small screw-type centrifugal pump operating in air-water two-phase flow[J].Transactions of the Japan Society of Mechanical Engineers Part B,1999,65(639):3690-3696.
[8] PIROUZPANAH S,GUDIGOPURAM S R,MORRISON G L.Two-phase flow characterization in a split vane impeller Electrical Submersible Pump[J].Journal of Petroleum Science & Engineering,2016,148:82-93.
[9] MINEMURA K,MURAKAMI M.A theoretical study on air bubble motion in a centrifugal pump impeller[J].Journal of Fluids Engineering,1980,102(4):446-455.
[10] FURUYA O.An analytical model for prediction of two-phase (noncondensable) flow pump performance[J].Journal of Fluids Engineering (Transaction of The ASME),1985,107 (1):139-147.
[11] CARIDAD J,KENYERY F.CFD Analysis of electric submersible pumps (ESP) handling two-phase mixtures[J].Journal of Energy Resources Technology,2004,126(2):99-104.
[12] KIM J H,LEE H C,KIM J H,et al.Improvement of hydrodynamic performance of a multiphase pump using design of experiment techniques[J].Journal of Fluids Engineering,2015,137(8):081301.
[13] MüLLER T,LIMBACH P,SKODA R.Numerical 3D RANS simulation of gas-liquid flow in a centrifugal pump with an Euler-Euler two-phase model and a dispersed phase distribution[C]// Proceedings of 11th European Conference on Turbomachinery Fluid dynamics & Thermodynamics.Madrid,2015.
[14] 付强,习毅,朱荣生,等.含气率对AP1000核主泵影响的非定常分析[J].振动与冲击,2015,34(6):132-136.FU Qiang,XI Yi,ZHU Rongsheng,et al.AP1000 nuclear main pump internal unsteady analysis under gas-liquid two phase condition[J].Journal of Vibration and Shock,2015,34(6):132-136.
[15] 袁建平,张克玉,司乔瑞,等.基于非均相流模型的离心泵气液两相流动数值研究[J].农业机械学报,2017,48(1):89-95.YUAN Jianping,ZHANG Keyu,SI Qiaorui,et al.Numerical investigation of gas-liquid two-phase flow in centrifugal pumps based on inhomogeneous model[J].Transactions of the Chinese Society for Agricultural Machinery,2017,48(1):89-95.
[16] SI Qiaorui,BOIS G,ZHANG Keyu,et al.Air-water two-phase flow experimental and numerical analysis in a centrifugal pump[C]//Proceedings of 12th European Conference on Turbomachinery (Fluid dynamics & Thermodynamics).Stockholm,Sweden,2017.
[17] 盛骤,谢式千.概率论与数理统计及其应用[M].北京:高等教育出版社,2004.
[18] LI Xiaojun,YU Benxu,JI Yucheng,et al.Statistical characteristics of suction pressure signals for a centrifugal pump under cavitating conditions[J].Journal of Thermal Science,2017,269(1):47-53.
[19] 司乔瑞,余志顺,袁寿其,等.带诱导轮高速离心泵流动诱导振动数值分析[J].振动与冲击,2013,32(20):102-106.SI Qiaorui,YU Zhishun,YUAN Shouqi,et al.Numerical study on flow induced vibration of high speed centrifugal pump with inducer,2013,32(20):102-106.
[2] 傅春.气液两相流动结构复杂性分析[D].天津:天津大学,2015.
[3] 陈次昌,刘正英,刘天宝,等.两相流泵的理论与设计[M].北京:兵器工业出版社,1993.
[4] PATEL B R,RUNSTADLER JR P W.Investigations into the two-phase flow behavior of centrifugal pumps[C]// Polyphase Flow in Turbomachinery,Proceedings of the Winter Annual Meeting.San Francisco,1978.
[5] KOSMOWSKI I.Behaviour of centrifugal pump when conveying gas entrained liquids[C]//7th Technical Conference of BPMA.York,1981.
[6] SEKOGUCHI K,TAKADA S,KANEMORI Y.Study of air-water two-phase centrifugal pump by means of electric resistivity probe technique for void fraction measurement:1st report,measurement of void fraction distribution in a radial flow impeller[J].Bulletin of JSME,1984,27(227):931-938.
[7] KIM Y T,TANAKA K,MATSUMOTO Y,et al.Characteristics and flow patterns of a small screw-type centrifugal pump operating in air-water two-phase flow[J].Transactions of the Japan Society of Mechanical Engineers Part B,1999,65(639):3690-3696.
[8] PIROUZPANAH S,GUDIGOPURAM S R,MORRISON G L.Two-phase flow characterization in a split vane impeller Electrical Submersible Pump[J].Journal of Petroleum Science & Engineering,2016,148:82-93.
[9] MINEMURA K,MURAKAMI M.A theoretical study on air bubble motion in a centrifugal pump impeller[J].Journal of Fluids Engineering,1980,102(4):446-455.
[10] FURUYA O.An analytical model for prediction of two-phase (noncondensable) flow pump performance[J].Journal of Fluids Engineering (Transaction of The ASME),1985,107 (1):139-147.
[11] CARIDAD J,KENYERY F.CFD Analysis of electric submersible pumps (ESP) handling two-phase mixtures[J].Journal of Energy Resources Technology,2004,126(2):99-104.
[12] KIM J H,LEE H C,KIM J H,et al.Improvement of hydrodynamic performance of a multiphase pump using design of experiment techniques[J].Journal of Fluids Engineering,2015,137(8):081301.
[13] MüLLER T,LIMBACH P,SKODA R.Numerical 3D RANS simulation of gas-liquid flow in a centrifugal pump with an Euler-Euler two-phase model and a dispersed phase distribution[C]// Proceedings of 11th European Conference on Turbomachinery Fluid dynamics & Thermodynamics.Madrid,2015.
[14] 付强,习毅,朱荣生,等.含气率对AP1000核主泵影响的非定常分析[J].振动与冲击,2015,34(6):132-136.FU Qiang,XI Yi,ZHU Rongsheng,et al.AP1000 nuclear main pump internal unsteady analysis under gas-liquid two phase condition[J].Journal of Vibration and Shock,2015,34(6):132-136.
[15] 袁建平,张克玉,司乔瑞,等.基于非均相流模型的离心泵气液两相流动数值研究[J].农业机械学报,2017,48(1):89-95.YUAN Jianping,ZHANG Keyu,SI Qiaorui,et al.Numerical investigation of gas-liquid two-phase flow in centrifugal pumps based on inhomogeneous model[J].Transactions of the Chinese Society for Agricultural Machinery,2017,48(1):89-95.
[16] SI Qiaorui,BOIS G,ZHANG Keyu,et al.Air-water two-phase flow experimental and numerical analysis in a centrifugal pump[C]//Proceedings of 12th European Conference on Turbomachinery (Fluid dynamics & Thermodynamics).Stockholm,Sweden,2017.
[17] 盛骤,谢式千.概率论与数理统计及其应用[M].北京:高等教育出版社,2004.
[18] LI Xiaojun,YU Benxu,JI Yucheng,et al.Statistical characteristics of suction pressure signals for a centrifugal pump under cavitating conditions[J].Journal of Thermal Science,2017,269(1):47-53.
[19] 司乔瑞,余志顺,袁寿其,等.带诱导轮高速离心泵流动诱导振动数值分析[J].振动与冲击,2013,32(20):102-106.SI Qiaorui,YU Zhishun,YUAN Shouqi,et al.Numerical study on flow induced vibration of high speed centrifugal pump with inducer,2013,32(20):102-106.