Effect of blade wrap angle in hydraulic turbine with forward-curved blades

2017 ◽  
Vol 42 (29) ◽  
pp. 18709-18717 ◽  
Author(s):  
Yuxing Bai ◽  
Fanyu Kong ◽  
Sunsheng Yang ◽  
Kai Chen ◽  
Tao Dai
Keyword(s):  
Hydraulic Turbine ◽  
Wrap Angle ◽  
Blade Wrap Angle

scholarly journals Influence of Blade Wrap Angle on the Hydrodynamic Radial Force of Single Blade Centrifugal Pump

2021 ◽  
Vol 11 (19) ◽  
pp. 9052
Author(s):  
Linwei Tan ◽  
Yongfei Yang ◽  
Weidong Shi ◽  
Cheng Chen ◽  
Zhanshan Xie
Keyword(s):  
Centrifugal Pump ◽  
Flow Rate ◽  
High Efficiency ◽  
Rate Increase ◽  
Radial Force ◽  
Horizontal Component ◽  
Flow Rate Increase ◽  
Wrap Angle ◽  
External Characteristics ◽  
Blade Wrap Angle

To investigate the effect of blade wrap angle on the hydrodynamic radial force of a single blade centrifugal pump, numerical simulation is conducted on the pumps with different blade wrap angles. The effect of the wrap angle on the external characteristics and the radial force of a single blade centrifugal pump was analyzed according to the simulation result. It is found that, with the increase of the blade wrap angle, the head and efficiency of the single blade centrifugal pump are improved, the H-Q curve becomes steeper, and the efficiency also increased gradually, while the high-efficiency area is narrowed. The blade wrap angle has a great effect on the radial force of the single blade centrifugal pump. When the blade wrap angle is less than 360°, the horizontal component of the radial force is negative and the value is reduced with the increase of the wrap angle of the blade. When the wrap angle is larger than 360°, the horizontal component of the radial force is positive and the value increases with the increase of the wrap angle. Under part-loading conditions, the radial force of the single blade pump is significantly reduced with the increase of the blade wrap angle. When the wrap angle is smaller than 360°, the radial force decreases with the flow rate increase. In the condition that the wrap angle is larger than 360°, the radial force increases with the flow rate increase.

scholarly journals Numerical Investigation of an Open-Design Vortex Pump with Different Blade Wrap Angles of Impeller

Processes ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 1601
Author(s):  
Xiongfa Gao ◽  
Ting Zhao ◽  
Weidong Shi ◽  
Desheng Zhang ◽  
Ya Shi ◽  
...  
Keyword(s):  
Flow Rate ◽  
Front Face ◽  
Structural Parameter ◽  
Pump Efficiency ◽  
Impeller Blade ◽  
Open Design ◽  
Vortex Pump ◽  
Lateral Cavity ◽  
Wrap Angle ◽  
Blade Wrap Angle

The blade wrap angle of impeller is an important structural parameter in the hydraulic design of open-design vortex pump. In this paper, taking a vortex pump with a cylindrical blade structure as the research object, two kinds of different blade wrap angle of vortex pump impellers are designed. The experiment and numerical simulation research is carried out, and the results of external characteristics and internal flow field are obtained under different flow rate. The results show that when ensuring that other main structural parameters remain unchanged, the efficiency and head of open-design vortex pump increase with the blade wrap angle decreases. In the case of blade wrap angle increasing, the length of rotating reflux back from lateral cavity to inlet is longer. For the same type of vortex pump, the length of rotating reflux to inlet decreases with the increase of flow rate. At the inlet area of impeller front face, there is an area where liquid flows back to the lateral cavity. The volute section shows that after passing through the impeller and lateral cavity, the liquid is discharged to the pump outlet with strong spiral strength. It is found that the blade wrap angle decreases and the shaft power increases, while the pump efficiency increases. The impeller blade wrap angle of vortex pump can be considered to select a smaller value.

Multi-objective optimization design of a centrifugal impeller considering both aerodynamic efficiency and structural machinability

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Xing Xie ◽  
Zhenlin Li ◽  
Baoshan Zhu ◽  
Hong Wang
Keyword(s):  
Optimization Design ◽  
Inverse Design ◽  
Centrifugal Impeller ◽  
Multi Objective Optimization ◽  
Blade Angle ◽  
Aerodynamic Efficiency ◽  
Blade Loading ◽  
Content Type ◽  
Wrap Angle ◽  
Blade Wrap Angle

Purpose This study aims to complete the optimization design of a centrifugal impeller with both high aerodynamic efficiency and good structural machinability. Design/methodology/approach First, the design parameters were derived from the blade loading distribution and the meridional geometry in the impeller three-dimensional (3D) inverse design. The blade wrap angle at the middle span surface and the spanwise averaged blade angle at the blade leading edge obtained from inverse design were chosen as the machinability objectives. The aerodynamic efficiency obtained by computational fluid dynamics was selected as the aerodynamic performance objective. Then, using multi-objective optimization with the optimal Latin hypercube method, quadratic response surface methodology and the non-dominated sorting genetic algorithm, the trade-off optimum impellers with small blade wrap angles, large blade angles and high aerodynamic efficiency were obtained. Finally, computational fluid dynamics and computer-aided manufacturing were performed to verify the aerodynamic performance and structural machinability of the optimum impellers. Findings Providing the fore maximum blade loading distribution at both the hub and shroud for the 3D inverse design helped to promote the structural machinability of the designed impeller. A straighter hub coupled with a more curved shroud also facilitated improvement of the impeller’s structural machinability. The preferred impeller was designed by providing both the fore maximum blade loading distribution at a relatively straight hub and a curved shroud for 3D inverse design. Originality/value The machining difficulties of the designed high-efficiency impeller can be reduced by reducing blade wrap angle and enlarging blade angle at the beginning of impeller design. It is of practical value in engineering by avoiding the follow-up failure for the machining of the designed impeller.

Effect of Blade Wrap Angle on Performance of a Single-Channel Pump

2018 ◽  
Vol 42 (5) ◽  
pp. 481-490 ◽  
Author(s):  
M. Tan ◽  
Y. Ji ◽  
H. Liu ◽  
X. Wu ◽  
Z. Zhu
Keyword(s):  
Single Channel ◽  
Wrap Angle ◽  
Blade Wrap Angle

Influence of blade wrap angle on centrifugal pump performance by numerical and experimental study

2014 ◽  
Vol 27 (1) ◽  
pp. 171-177 ◽  
Author(s):  
Lei Tan ◽  
Baoshan Zhu ◽  
Shuliang Cao ◽  
Hao Bing ◽  
Yuming Wang
Keyword(s):  
Experimental Study ◽  
Centrifugal Pump ◽  
Pump Performance ◽  
Wrap Angle ◽  
Blade Wrap Angle

Effects of Blade Wrap Angle Influencing a Pump as Turbine

2012 ◽  
Vol 134 (6) ◽  
Author(s):  
Sun-Sheng Yang ◽  
Fan-Yu Kong ◽  
Hao Chen ◽  
Xiang-Hui Su
Keyword(s):  
Theoretical Analysis ◽  
Pressure Head ◽  
Hydraulic Loss ◽  
Impeller Blade ◽  
Loss Distribution ◽  
Performance Change ◽  
Shaft Power ◽  
Wrap Angle ◽  
Specific Speed ◽  
Blade Wrap Angle

A pump is not ideally designed to operate as a turbine. To improve the efficiency of a pump as turbine (PAT), the redesign of the PAT, according to the flow of the turbine, is required. The blade wrap angle is one of the main geometric parameters in impeller design. Therefore, an investigation into the blade wrap angle to the PAT’s influence can be useful. In order to understand blade wrap angle to the influence of the PAT, this paper numerically investigated three different specific speeds of PATs with different blade wrap angles. The validity of numerical simulation was first confirmed through a comparison between numerical and experimental results. The performance change of the PATs with the blade wrap angle was acquired. A detailed hydraulic loss distribution and a theoretical analysis were performed to investigate the reasons for performance changes caused by the blade wrap angle. The results show that there is an optimal blade wrap angle for a PAT to achieve the highest efficiency and the optimal blade wrap angle decreases with an increasing specific speed. A performance analysis shows the PAT’s flow versus pressure head (Q-H) and flow versus generated shaft power (Q-P) curves are lowered with the decrease of the blade wrap angle. The hydraulic loss distribution and theoretical analysis illustrate that it is the decrease of hydraulic loss within the impeller, together with the decrease of the theoretical head, that results in the performance decrease. The decrease of hydraulic loss within the impeller is attributed to the shortened impeller blade passage and the reduced velocity gradient within the impeller flow channel. With the decrease of the blade wrap angle, the slip factor of the PAT’s impeller is decreased; therefore, its theoretical head is also decreased.

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