Numerical simulation of hydrodynamic and cavitation performance of pumpjet propulsor with different tip clearances in oblique flow

2020 ◽  
Vol 209 ◽  
pp. 107285 ◽  
Author(s):  
Chengcheng Qiu ◽  
Qiaogao Huang ◽  
Guang Pan ◽  
Yao Shi ◽  
Xinguo Dong
Keyword(s):  
Numerical Simulation ◽  
Cavitation Performance ◽  
Oblique Flow

scholarly journals Numerical Simulation Analysis of Cavitation Performance of Tandem Propeller

2018 ◽  
Vol 36 (3) ◽  
pp. 509-515 ◽  
Author(s):  
Xiaoxu Du ◽  
Zhengdong Zhang
Keyword(s):  
Numerical Simulation ◽  
Simulation Analysis ◽  
Cavitation Number ◽  
Hydrodynamic Characteristics ◽  
Turbulent Model ◽  
Cavitation Model ◽  
Cavitation Phenomenon ◽  
Cavitation Performance ◽  
Simulation Results ◽  
Good Agreement

The steady non cavitation hydrodynamic characteristics of CLB4-55-1 tandem propeller and the steady cavitation flows of NACA66 hydrofoil are numerically studied firstly based on the RANS equations of homogeneous multiphase using CFD theory, combined with the SST k-ω turbulent model and Z-G-B cavitation model. Numerical simulation results are in good agreement with the experimental results, which indicates that the numerical method is reliable and accurate. Then, the cavitation performance of the tandem propeller are numerical simulated and analyzed. The results show that the computational model can predict the cavitation performance of tandem propeller accurately. The cavitation performance of tandem propeller is nearly the same as single propeller, however, the cavitation phenomenon of back propeller is greater than the head propeller at certain advance coefficient and cavitation number. The cavitation phenomenon will disappear with the increase of the advance coefficient or the cavitation number.

Experiment and numerical simulation of cavitation performance for a double suction centrifugal pump

2015 ◽  
Vol 45 (10) ◽  
pp. 1111-1116
Author(s):  
GenQiQiGe MENG ◽  
PeiRu WEI ◽  
Wen JIAN ◽  
ShuLiang CAO ◽  
Lei TAN ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Centrifugal Pump ◽  
Cavitation Performance

Cavitation Performance Study Based on Numerical Simulation of the Magnetic Driving Pump

2010 ◽  
Author(s):  
Fanyu Kong ◽  
Xiaokai Shen ◽  
Xufeng Zhang ◽  
Kuanrong Xue ◽  
Shuiqing Zhou ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Performance Study ◽  
Variable Pitch ◽  
Long Period ◽  
Cavitation Performance ◽  
Hydraulic Design ◽  
Design Requirements ◽  
Pump Inlet ◽  
Flow Head

A new magnetic driving pump with low-NPSHR had been developed to ensure leakage-free for transporting fluid. In hydraulic design, several common measures, according to the equation of cavitation, were applied to lower down the NPSHR of the pump. Moreover, a variable-pitch inducer whose pitch increases gradually was installed at the inlet of impeller. Cavitation performance of the magnetic driving pump and the reasons why the NPSHR was reduced by installing a variable-pitch inducer were analyzed according to the simulation predicted flow field at the pump inlet and inducer. The test of cavitation performance showed that the magnetic driving pump had the excellent cavitation performance, and met the design requirements in flow, head and vibration. The magnetic driving pump presented the reliability after a long period of operation in a petrochemical corporation. Therefore, magnetic driving pumps with low-NPSHR would have a great future in petrochemical, shipping and other important fields.

Numerical Simulation of Cavitation Flow in a Centrifugal Pump

2013 ◽  
Vol 444-445 ◽  
pp. 509-516 ◽  
Author(s):  
Wei Guo Zhao ◽  
Xiao Xia He ◽  
Xiu Yong Wang ◽  
Yi Bin Li
Keyword(s):  
Numerical Simulation ◽  
Centrifugal Pump ◽  
Cavitation Number ◽  
Suction Surface ◽  
Two Phase ◽  
Cavitation Performance ◽  
Practical Operation ◽  
And Performance ◽  
Pump Cavity ◽  
Homogeneous Mixture Model

Based on two phase homogeneous mixture model, numerical simulation of the cavitating flow was performed on a centrifugal pump. Cavity shapes and performance of the pump in variable cavitation numbers were obtained. Numerical results show that the numerical method can be used to predict the cavitation performance of centrifugal pump; the incipient cavitation number is predicted, and the cavity shape is similar with the experiment; cavitation usually appears in the suction surface of the blade and locates in the inlet side, and becomes longer to the outlet direction with lower cavitation number; when the cavitation number is relatively higher, cavitating region locates in the inlet area of the blade and is relatively stable, while develops and separates when cavitation number becomes lower; when the cavitation number equals to the incipient cavitation number, performance of the centrifugal pump has no change almost, only when cavitation number reduces to some extent, the head decreases abruptly and also the efficiency, which means the pump operates in a bad condition and this condition should be avoided in the practical operation.

Numerical Simulation and Analysis of Cavitation Performance of Waterjet

2008 ◽  
Author(s):  
Chengjiang Liu ◽  
◽  
Yongsheng Wang ◽  
Zhihong Zhang ◽  
◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Cavitation Performance

Investigations on the effects of obstacles on the surfaces of blades of the centrifugal pump to suppress cavitation development

2021 ◽  
pp. 2150327
Author(s):  
Weiguo Zhao ◽  
Bao Guo
Keyword(s):  
Numerical Simulation ◽  
Kinetic Energy ◽  
Centrifugal Pump ◽  
Cavitation Flow ◽  
Cavitation Model ◽  
Cavitation Performance ◽  
Simulation Results ◽  
Specific Speed ◽  
And Control ◽  
Good Agreement

This paper proposes a new method that obstacles are attached to both the suction and pressure surfaces of the blades to suppress cavitation development. A centrifugal pump with a specific speed of 32 is selected as the physical model to perform the external characteristic and cavitation performance experiments. SST [Formula: see text] turbulence model and Zwart cavitation model were employed to simulate the unsteady cavitation flow in the pump. The results indicate that the numerical simulation results are in good agreement with the experimental counterparts. After the obstacles are arranged, the maximum head decrease is only 1.37%, and the relative maximum drop of efficiency is 1.12%. Obstacles have minimal impacts on the variations of head and efficiency under all flow rate conditions. The distribution of vapor volume in the centrifugal pump is significantly reduced after obstacles are arranged and the maximum fraction reduction is 53.6%. The amplitude of blade passing frequency decreases significantly. While obstacles decrease the intensity of turbulent kinetic energy near the wall in the impeller passages to effectively reduce the distribution of cavitation bubbles, and control the development of cavitation. After the obstacles are set, the strength of the vortex in the impeller passages is weakened significantly, the shedding of the vortex is suppressed, flow in the impeller becomes more stable.

Water uptake by substituted amylose tablets: experimentation and numerical simulation

2009 ◽  
Vol 00 (00) ◽  
pp. 090904073309027-8
Author(s):  
H.W. Wang ◽  
S. Kyriacos ◽  
L. Cartilier
Keyword(s):  
Numerical Simulation ◽  
Water Uptake
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