Blade optimization design and performance investigations of an ultra-low specific speed centrifugal blower

2010 ◽  
Vol 54 (1) ◽  
pp. 203-210 ◽  
Author(s):  
Bin Zhang ◽  
Tong Wang ◽  
ChuanGang Gu ◽  
XinWei Shu
Keyword(s):  
Optimization Design ◽  
Centrifugal Blower ◽  
Blade Optimization ◽  
Low Specific Speed ◽  
Specific Speed ◽  
And Performance

Optimum Design and Experimental Study of a Very Low-Specific-Speed Centrifugal Blower Blade

2009 ◽  
Author(s):  
Xinwei Shu ◽  
Chuangang Gu ◽  
Tong Wang ◽  
Bo Yang
Keyword(s):  
High Pressures ◽  
Operating Cost ◽  
Experimental Studies ◽  
Approximate Model ◽  
Optimization Approach ◽  
Centrifugal Blower ◽  
Reference Case ◽  
Impeller Blade ◽  
Low Specific Speed ◽  
Specific Speed

Low-specific-speed centrifugal blowers are widely used in industries for compressing gases to high pressures at low flows. They have relatively low manufacturing and operating cost. However, their efficiency is fairly low as a result of relatively high leakage, disc friction and passage friction pressure loss. The purpose of this paper is to show how the performances can be improved by properly reshaping its blade profile using a developed multipoint optimization approach. The core of this approach is to build an approximate model mapping the correlation between certain blade shape parameters and corresponding aerodynamic performances. The approach is implemented by the combining a blade parameterization code, a three-dimensional viscous flow solver and several improved numerical optimization algorithms. A very low-specific speed industrial centrifugal blower with parallel hub and shroud has been selected as a reference case. The superior performances of the optimized impeller blade are demonstrated by comparing the performance improvement with that of the original blade. This is then confirmed by experimental studies.

scholarly journals Numerical analysis for the effect of tip clearance in a low specific speed mixed-flow pump

2019 ◽  
Vol 11 (3) ◽  
pp. 168781401983222 ◽  
Author(s):  
Zhiyi Yu ◽  
Wenwu Zhang ◽  
Baoshan Zhu ◽  
Yongjiang Li
Keyword(s):  
Optimization Design ◽  
Flow Direction ◽  
Tip Clearance ◽  
Mixed Flow ◽  
Ansys Cfx ◽  
Unsteady Simulation ◽  
Low Specific Speed ◽  
Specific Speed ◽  
External Characteristics ◽  
Flow Pump

To study the influence of tip clearance on performance (external characteristics, pressure fluctuation and tip loss) of a low specific speed mixed-flow pump, unsteady simulation was performed for the whole flow passage with five tip clearance sizes ( δ0 = 0 mm, δ1 = 0.10 mm, δ2 = 0.25 mm, δ3 = 0.75 mm and δ4 = 1 mm). The reliability of the numerical methodology was verified in external characteristics (efficiency, head and power) and fluctuation. The performance of the pump was obtained under different discharges and tip clearance sizes using ANSYS CFX. The results showed that the variation of tip clearance size has greater effect on the external characteristics under large discharges. Meanwhile, along the flow direction, the fluctuation coefficients near the impeller shroud increase gradually with the smaller tip clearance sizes ( δ = 0.10 and 0.25 mm), while for the larger tip clearance sizes ( δ = 0.75 and 1.00 mm), the significant increase of fluctuation near the shroud of impeller inlet is closely associated with the clear leakage vortex and the large region of low pressure. Besides, with the increase of tip clearance size, the effect of tip clearance will become more remarkable under different discharge conditions. According to this study, for the optimization design of such pumps, the size of the tip clearance is suggested to be about 0.9% times the blade height at middle of the impeller passage.

Applied Micro Genetic Algorithm to Optimize Design Low Specific Speed Pump Impeller

2013 ◽  
Vol 816-817 ◽  
pp. 1010-1014
Author(s):  
Deng Song Li ◽  
Wen Wu Song ◽  
Fu Jie ◽  
Tian Long Wu
Keyword(s):  
Genetic Algorithm ◽  
Optimization Design ◽  
High Efficiency ◽  
Design Method ◽  
Pump Impeller ◽  
Shaft Power ◽  
Low Specific Speed ◽  
Micro Genetic Algorithm ◽  
Specific Speed ◽  
Design Deficiencies

The combination of enlarged flow design and micro-genetic algorithm constitute a new optimization design method, which be applied to optimization design of low specific speed pump impeller. It improves enlarged flow design deficiencies, and making overall performance of the pump better. The experimental results of a low specific speed centrifugal pump impeller designed by proposed method show that pump high efficiency range is extended, the hump phenomenon is eliminated, and shaft power overload phenomenon has been resolved.

Design and Analysis of Energy-Efficient Low-Flow Centrifugal Compressors

2020 ◽  
Vol 142 (8) ◽  
Author(s):  
Cheng Xu ◽  
Lei Chen ◽  
Ryoichi S. Amano
Keyword(s):  
Flow Coefficient ◽  
Low Flow ◽  
Design Strategies ◽  
Design Features ◽  
Centrifugal Compressors ◽  
Design Studies ◽  
Low Specific Speed ◽  
Specific Speed ◽  
And Performance ◽  
Low Flow Coefficient

Abstract With the increasing demands of energy-saving from industries, the low-flow coefficient and low specific speed centrifugal compressors have gained more attention. The design of this type of compressor faced many challenges, for example, high secondary flow losses, high tip leakage losses, and low exit width based on a Reynolds number. The design also lacks a reliable database for preliminary studies. The impeller design studies were limited. Most designs for low-flow coefficient and low specific speed compressor follow the traditional methods. This paper presents design studies and discusses some unique design features to improve performance of this type of compressor. The detail computational fluids dynamics (CFD) results are presented to demonstrate the success of the design strategies. A prototype compressor for fuel cell applications was built, and performance tests were performed. The test results are compared with those of the computational analysis, and the agreement is reasonably satisfactory. The compressor meets the customer's performance goals. The design features can be used for future low-flow coefficient and low specific speed centrifugal compressor design.

scholarly journals The Role of Blade Sinusoidal Tubercle Trailing Edge in a Centrifugal Pump with Low Specific Speed

Processes ◽  
2019 ◽  
Vol 7 (9) ◽  
pp. 625 ◽  
Author(s):  
Bowen Li ◽  
Xiaojun Li ◽  
Xiaoqi Jia ◽  
Feng Chen ◽  
Hua Fang
Keyword(s):  
Centrifugal Pump ◽  
Pressure Pulsation ◽  
Suction Side ◽  
High Amplitude ◽  
Pressure Pulsations ◽  
Trailing Edge ◽  
Low Specific Speed ◽  
Specific Speed ◽  
And Performance ◽  
The Impact

Pressure pulsations may cause high-amplitude vibrations during the process of a centrifugal pump. The trailing edge shape of the blade has a critical influence on the pump’s pressure fluctuation and hydraulic characterization. In this paper, inspired by the humpback whale flipper, the authors research the impact of applying the sinusoidal tubercles to the blade suction side of the trailing edge. Numerical calculation and experiments are carried out to investigate the impact of the trailing edge shape on the pressure pulsations and performance of a centrifugal pump with low specific speed. Two designed impellers are tested, one is a sinusoidal tubercle trailing edge (STTE) impeller and the other is the original trailing edge (OTE) prototype. The detailed study indicates that the sinusoidal tubercle trailing edge (STTE) reduces pressure pulsation and enhances hydraulic performance. In the volute tongue region, the pressure pulsation amplitudes of STTE at fBPF decrease significantly. The STTE impeller also effectively changes the vortex structure and intensity in the blade trailing edge area. This investigation will be of great benefit to the optimal design of pumps.

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