Experimental study of operation performance for hydrocarbon fuel pump with low specific speed

2017 ◽  
Vol 26 (5) ◽  
pp. 440-447 ◽  
Author(s):  
Xianyu Wu ◽  
Jun Yang ◽  
Xuan Jin
Keyword(s):  
Experimental Study ◽  
Hydrocarbon Fuel ◽  
Operation Performance ◽  
Fuel Pump ◽  
Low Specific Speed ◽  
Specific Speed

The Operating Point Determination of Special Turbine in Cooling Tower

2011 ◽  
Vol 383-390 ◽  
pp. 2423-2425
Author(s):  
Yan Pin Li ◽  
Yan Ren ◽  
Gao Feng Yue
Keyword(s):  
Experimental Study ◽  
Cooling Tower ◽  
Flow Characteristics ◽  
Operating Point ◽  
Theory Analysis ◽  
Speed Flow ◽  
Low Specific Speed ◽  
Point Determination ◽  
Specific Speed

This article introduces the theory analysis and experimental study on the performance of special turbine in cooling tower. The author analyses the speed-flow characteristics of turbine-fan unit and the speed-flow characteristics of ultra-low specific speed turbine itself. At the same time the author points out the principles and methods to determine the best operating point of turbine-fan unit. So it is very important to determine whether the specific turbine is in the best condition.

scholarly journals Experimental Study on Transient Startup Characteristics of a Super Low Specific Speed Centrifugal Pump

2019 ◽  
Vol 52 (9) ◽  
pp. 743-750
Author(s):  
Yong Wang ◽  
Lei Xie ◽  
Jie Chen ◽  
Hou-lin Liu ◽  
Kaikai Luo ◽  
...  
Keyword(s):  
Experimental Study ◽  
Centrifugal Pump ◽  
Low Specific Speed ◽  
Specific Speed

An Experimental Study on the Effect of Oil Viscosity and Wear-Ring Clearance on the Performance of an Industrial Centrifugal Pump

2012 ◽  
Vol 134 (1) ◽  
Author(s):  
Wen-Guang Li
Keyword(s):  
Experimental Study ◽  
Centrifugal Pump ◽  
Hydraulic Parameters ◽  
Centrifugal Pumps ◽  
Oil Viscosity ◽  
Relative Variation ◽  
Performance Curves ◽  
Shaft Power ◽  
Low Specific Speed ◽  
Specific Speed

The clearance of wear-rings in the impeller of centrifugal pumps has an important influence on the pump’s performance. Unfortunately, this effect has not been quite well documented, especially for the centrifugal pumps handling viscous oils. An industrial centrifugal pump with low specific speed was employed as a model to investigate the effect of the clearance on the performance of the pump. In this experimental study, the clearances of the wear-rings on the impeller shroud and hub were enlarged; the performances of the pump were measured when it pumped water and the viscous oils. The performance curves, the hydraulic parameters, and their relative variation ratios at best efficiency points were examined carefully for different clearances at various viscosities. The results showed that the flow rate is varied relatively in a range of −6% − +5%, the head −10% − +6%, the shaft-power + 2% −+8% and the efficiency −19% − +2%, respectively, when the clearance was enlarged from 0.25 mm to 0.85 mm at best efficiency points. The clearance of wear-rings on shroud has a more significant influence on the performance than on the hub. However, such an effect is weakened with increasing viscosity.

Theory and application of two-dimension viscous hydraulic design of the ultra-low specific-speed centrifugal pump

2019 ◽  
Vol 234 (1) ◽  
pp. 58-71 ◽  
Author(s):  
Cong Wang ◽  
Yongxue Zhang ◽  
Hucan Hou ◽  
Zhiyi Yuan
Keyword(s):  
Boundary Layer ◽  
Centrifugal Pump ◽  
Diagnostic Model ◽  
Two Dimension ◽  
Cavitation Performance ◽  
Hydraulic Design ◽  
Displacement Thickness ◽  
Low Specific Speed ◽  
Specific Speed ◽  
Low Efficiency

Low efficiency and bad cavitation performance restrict the development of the ultra-low specific-speed centrifugal pump (ULSSCP). In this research, combined turbulent boundary layer theory with two-dimension design and two-dimension viscous hydraulic design method has been proposed to redesign a ULSSCP. Through the solution of the displacement thickness in the boundary layer, a less curved blade profile with a larger outlet angle was obtained. Then the hydraulic and cavitation performance of the reference pump and the designed pump were numerically studied. The comparison of performance of the reference pump calculated by the numerical and experimental results revealed a better agreement. Research shows that the average hydraulic efficiency and head of the designed pump improve by 2.9% and 3.3%, respectively. Besides, the designed pump has a better cavitation performance. Finally, through the internal flow analysis with entropy production diagnostic model, a 24.8% drop in head loss occurred in the designed pump.

Optimal hydraulic design of an ultra-low specific speed centrifugal pump based on the local entropy production theory

2019 ◽  
Vol 233 (6) ◽  
pp. 715-726 ◽  
Author(s):  
Hucan Hou ◽  
Yongxue Zhang ◽  
Xin Zhou ◽  
Zhitao Zuo ◽  
Haisheng Chen
Keyword(s):  
Entropy Production ◽  
Centrifugal Pump ◽  
Orthogonal Design ◽  
High Energy ◽  
Geometrical Parameters ◽  
Production Theory ◽  
Local Entropy ◽  
Hydraulic Design ◽  
Low Specific Speed ◽  
Specific Speed

The ultra-low specific speed centrifugal pump has been widely applied in aerospace engineering, metallurgy, and other industrial fields. However, its hydraulic design lacks specialized theory and method. Moreover, the impeller and volute are designed separately without considering their coupling effect. Therefore, the optimal design is proposed in this study based on the local entropy production theory. Four geometrical parameters are selected to establish orthogonal design schemes including blade outlet setting angle, wrapping angle volute inlet width, and throat area. Subsequently, a 3D steady flow with Reynolds stress turbulent model and energy equation model is numerically conducted and the entropy production is calculated by a user-defined function code. The range analysis is made to identify the optimal scheme indicating that the combination of local entropy production and orthogonal design is feasible on pump optimization. The optimal pump is visibly improved with an increase of 1.08% in efficiency. Entropy production is decreased by 16.75% and 6.03% in impeller and volute, respectively. High energy loss areas are captured and explained in terms of helical vortex and wall friction, and the turbulent and wall entropy production are respectively reduced by 3.82% and 14.34% for the total pump.

Sign in / Sign up

Export Citation Format

Share Document