TY - JOUR
T1 - Numerical Prediction of the Pumpjet Propulsor Tip Clearance Vortex Cavitation in Uniform Flow
AU - Li, Han
AU - Pan, Guang
AU - Huang, Qiaogao
AU - Shi, Yao
N1 - Publisher Copyright:
© 2019, Shanghai Jiao Tong University and Springer-Verlag GmbH Germany, part of Springer Nature.
PY - 2020/6/1
Y1 - 2020/6/1
N2 - Previous studies show that the tip clearance loss limits the improvement of pumpjet propulsor (PJP) performance, and the tip clearance flow field is the most complicated part of PJP flow. In this work, the noncavitation and cavitation hydrodynamic performances of PJP with a tip clearance size of 1mm are obtained by using the detached-eddy simulation (DES). At constant oncoming velocity, cavitation first occurs on the duct and then disappears with the decrease of the advance ratio. The rotor blade cavitation occurs at the low advance ratio and comprises tip clearance cavitation, tip leakage cavitation, and blade sheet cavitation. In the rotor region, the typical vortices include tip separation vortex, tip leakage vortex, trailing edge shedding vortex, and blade root horseshoe vortex. Combined with the pressure distribution, both the Q and λ2 criteria give reliable results of vortex identification. The cavitation causes an expansion of tip leakage vortex in the circumferential direction and decreases the intensities of tip separation vortex in the whole tip clearance area and tip leakage vortex in the cavitation area, and enhances the strength of tip leakage vortex in the downstream non-cavitation area. Key words: pumpjet propulsor (PJP), hydrodynamics, cavitation, vortex, tip clearance vortex.
AB - Previous studies show that the tip clearance loss limits the improvement of pumpjet propulsor (PJP) performance, and the tip clearance flow field is the most complicated part of PJP flow. In this work, the noncavitation and cavitation hydrodynamic performances of PJP with a tip clearance size of 1mm are obtained by using the detached-eddy simulation (DES). At constant oncoming velocity, cavitation first occurs on the duct and then disappears with the decrease of the advance ratio. The rotor blade cavitation occurs at the low advance ratio and comprises tip clearance cavitation, tip leakage cavitation, and blade sheet cavitation. In the rotor region, the typical vortices include tip separation vortex, tip leakage vortex, trailing edge shedding vortex, and blade root horseshoe vortex. Combined with the pressure distribution, both the Q and λ2 criteria give reliable results of vortex identification. The cavitation causes an expansion of tip leakage vortex in the circumferential direction and decreases the intensities of tip separation vortex in the whole tip clearance area and tip leakage vortex in the cavitation area, and enhances the strength of tip leakage vortex in the downstream non-cavitation area. Key words: pumpjet propulsor (PJP), hydrodynamics, cavitation, vortex, tip clearance vortex.
KW - A
KW - cavitation
KW - hydrodynamics
KW - pumpjet propulsor (PJP)
KW - tip clearance vortex
KW - U 661.73
KW - vortex
UR - http://www.scopus.com/inward/record.url?scp=85076556693&partnerID=8YFLogxK
U2 - 10.1007/s12204-019-2138-7
DO - 10.1007/s12204-019-2138-7
M3 - 文章
AN - SCOPUS:85076556693
SN - 1007-1172
VL - 25
SP - 352
EP - 364
JO - Journal of Shanghai Jiaotong University (Science)
JF - Journal of Shanghai Jiaotong University (Science)
IS - 3
ER -