间隙空化流动的非定常特性研究及验证确认分析
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摘要
该文利用数值模拟手段,对间隙空化流动进行了细致的数值计算与分析。为了对数值结果的可靠性进行定量化的评估,采用了基于Richardson外推法的多种CFD不确定度估计方法。在此基础上,该文利用基于拉格朗日观点的三维拉格朗日分析技术,对间隙空化流动的演变规律进行细致的分析,该研究表明,涡心内部粒子的运动在较大程度上受到梢涡空化周围流速分布及壁面效应的影响。该研究有助于加深对于间隙空化流动的进一步认识。
In this paper, numerical investigations of the unsteady cavitating flow are conducted. To quantitatively evaluate the reliability of numerical data, several error estimators based on the Richardson extrapolation method are utilized. And then,with a three-dimensional Lagrangian technology, the evolution of flow pattern in the tip leakage cavitating flow is investigated in detail. It shows that the movement of particles in the core of TLV cavitation is significantly influenced by the velocity distribution around the TLV and the wall proximity. The work is helpful to obtain a better understanding about tip-leakage cavitating flow.
In this paper, numerical investigations of the unsteady cavitating flow are conducted. To quantitatively evaluate the reliability of numerical data, several error estimators based on the Richardson extrapolation method are utilized. And then,with a three-dimensional Lagrangian technology, the evolution of flow pattern in the tip leakage cavitating flow is investigated in detail. It shows that the movement of particles in the core of TLV cavitation is significantly influenced by the velocity distribution around the TLV and the wall proximity. The work is helpful to obtain a better understanding about tip-leakage cavitating flow.
引文
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[5]DREYER M,DECAIX J,MUNCH-ALLIGNE C,et al.Mind the gap:a new insight into the tip leakage vortex using stereo-PIV[J].Experiments in Fluids,2014.55(11):1894.
[6]GUO Q,ZHOU L J,WANG Z W,et al.Numerical simulation for the tip leakage vortex cavitation[J].Ocean Engineering,2018.151:71-81.
[7]ZHAO Y,WANG G Y,JIANG Y T,et al.Numerical analysis of developed tip leakage cavitating flows using a new transport-based model[J].International Communications in Heat and Mass Transfer,2016.78:39-47.
[8]XING T,STERN F.Factors of safety for richardson extrapolation[J].Journal of Fluids EngineeringTransactions of the Asme,2010.132(6):061403.
[9]LONG Y,LONG X P,JI B,et al.Verification and validation of URANS simulations of the turbulent cavitating flow around the hydrofoil[J].Journal of Hydrodynamics,2017.29(4):610-620.
[2]CHEN G T,GREITZER E M,TAN C S,et al.Similarity analysis of compressor tip clearance flow structure[J].Journal of Turbomachinery,1991.113(2):260-269.
[3]RAINS D A.Tip clearance flows in axial flow compressors and pumps[D].California Institute of Technology,1954.
[4]LAKSHMINARAYANA B,ZACCARIA M,MARATHEB.The structure of tip clearance flow in axial-flow compressors[J].Journal of Turbomachinery-Transactions of the ASME,1995.117(3):336-347.
[5]DREYER M,DECAIX J,MUNCH-ALLIGNE C,et al.Mind the gap:a new insight into the tip leakage vortex using stereo-PIV[J].Experiments in Fluids,2014.55(11):1894.
[6]GUO Q,ZHOU L J,WANG Z W,et al.Numerical simulation for the tip leakage vortex cavitation[J].Ocean Engineering,2018.151:71-81.
[7]ZHAO Y,WANG G Y,JIANG Y T,et al.Numerical analysis of developed tip leakage cavitating flows using a new transport-based model[J].International Communications in Heat and Mass Transfer,2016.78:39-47.
[8]XING T,STERN F.Factors of safety for richardson extrapolation[J].Journal of Fluids EngineeringTransactions of the Asme,2010.132(6):061403.
[9]LONG Y,LONG X P,JI B,et al.Verification and validation of URANS simulations of the turbulent cavitating flow around the hydrofoil[J].Journal of Hydrodynamics,2017.29(4):610-620.