Uncertainty analysis using the thermodynamic method of pump efficiency testing

Feng, Hanxin; Xu, Lisa X.; Xu, Ruiling; Wu, Linzhu; Shi, Xiaohui; Yan, Jinquan; Wang, T Y

doi:10.1243/095440604323052328

Cited by 7 publications

(3 citation statements)

References 2 publications

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“…The pump inlet and outlet pressure is measured by a pressure transmitter with 0.1% measurement error. The overall measurement uncertainty is calculated from the square root of the sum of the squares of the systematic and random uncertainties [28], and the calculated result of expanded uncertainty of efficiency is 0.5%. The performance of the original pump under multiflow rates was tested by experiments.…”

Section: Performance Experimentmentioning

confidence: 99%

Performance Optimization in a Centrifugal Pump Impeller by Orthogonal Experiment and Numerical Simulation

Zhou

Shi

2013

Advances in Mechanical Engineering

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In order to improve the hydrodynamic performance of the centrifugal pump, an orthogonal experiment was carried out to optimize the impeller design parameters. This study employs the commercial computational fluid dynamics (CFD) code to solve the NavierStokes equations for three-dimensional steady flow and predict the pump performance. The prototype experimental test results of the original pump were acquired and compared with the data predicted from the numerical simulation, which presents a good agreement under all operating conditions. Five main impeller geometric parameters were chosen as the research factors. According to the orthogonal table, 16 impellers were designed and modeled. Then, the 16 impellers equipped with the same volute were simulated by the same numerical methods. Through the variance analysis method, the best parameter combination for higher efficiency was captured finally. Compared with the original pump, the pump efficiency and head of optimal pump have a significant improvement.

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Section: Performance Experimentmentioning

confidence: 99%

Performance Optimization in a Centrifugal Pump Impeller by Orthogonal Experiment and Numerical Simulation

Zhou

Shi

2013

Advances in Mechanical Engineering

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“…The electrical power input is measured with a three-phase torque meter. The overall measurement uncertainty is calculated from the square root of the sum of the squares of the systematic and random uncertainties [27]. The performance of the original pump at multi-flow rates is tested via the experiments.…”

Section: Model Testmentioning

confidence: 99%

Influence of the Openness of Inlet One-way Valve on the Flow Characteristics in Series-Parallel Centrifugal Pumps

Yan

Chen³

et al. 2018

Teh. vjesn.

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Series-parallel centrifugal pumps realize series and parallel running conditions through unique inlet one-way valve and reversing valve structures. In the running process, changes in the openness of the inlet one-way valve cause changes in the running parameters of the two impellers and in the inner flow field, thereby inducing pressure fluctuation and intensifying unit vibration. In this study, the change law of internal flow of the series-parallel centrifugal pumps was disclosed under different openness degrees of the inlet one-way valve and its internal relationship with pressure fluctuation was clarified by combining numerical simulation and model experiment. The major causes of pressure fluctuation and hydraulic performance changes induced by changes of internal flow field were analyzed. Results show that when the openness of the one-way valve is smaller than 20°, the two impellers present different operational states under parallel connection, which deteriorate the hydraulic performance of pumps. Decreasing the openness of one-way valve can reduce the pressure around the inlet of the second-stage blade and induce eddies; however, it slightly influences the pressure at the inlet of the first-stage blade. With the changes in the openness of the inlet one-way valve, the fluctuation frequency at the occurrence of maximum fluctuation remains the same; however, the fluctuation amplitude changes considerably. The fluctuation amplitude under small openness is lower than that under large openness. Conclusions obtained in the study have important implications in reducing the vibration and noise of series-parallel centrifugal pumps.

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“…The inlet pressure and exit pressure of SPCPs are accurately measured at about ±0.1 % with pressure sensors, the flow rate is accurately measured at about ±0.1 % with an electromagnetic flow meter, and the electrical power input is measured with a three-phase torque meter. The overall measurement uncertainty is calculated from the square root of the sum of the squares of the systematic and random uncertainties [17], and the calculated results of the expanded uncertainty of efficiency is 0.5 %. The performance of the original pump at multi-flow rates is tested by experiments.…”

Section: Experimental Measurement For Pumpsmentioning

confidence: 99%

Simulation of Non-Overload Characteristics of Serial-Parallel Centrifugal Pumps

Li¹,

He²,

Shi³

2016

Int. j. simul. model.

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Serial-parallel centrifugal pumps (SPCPs) are a new type of pump with two working conditions: high head with low flow and low head with high flow. However, the motor of SPCPs is easily burned because of its various operating conditions. To clarify the effect of the flow field on the non-overload characteristics of SPCPs, revealing the non-uniformity of the flow distribution is necessary. This study derived the velocity triangle theory of the pump, and a numerical simulation by 3D models was conducted to investigate the internal flow patterns of SPCPs. The magnitude of the flow deviation angle at different cross-sections was calculated to evaluate the non-overload characteristics under different operating conditions. The results showed that the formula of the maximum shaft power and the local flow rate were two important parameters of the non-overload interpretation of the pump. The simulated results were in good agreement with the experimental results at the designed flow rate. In addition, the flow deviation angle under the serial operating condition, which was more likely to achieve the non-overload characteristics, was evidently higher than that under the parallel operating condition. The conclusions solved the issue on the theoretical design of the non-overload characteristics considered in a non-uniform flow in SPCPs.

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Uncertainty analysis using the thermodynamic method of pump efficiency testing

Cited by 7 publications

References 2 publications

Performance Optimization in a Centrifugal Pump Impeller by Orthogonal Experiment and Numerical Simulation

Performance Optimization in a Centrifugal Pump Impeller by Orthogonal Experiment and Numerical Simulation

Influence of the Openness of Inlet One-way Valve on the Flow Characteristics in Series-Parallel Centrifugal Pumps

Simulation of Non-Overload Characteristics of Serial-Parallel Centrifugal Pumps

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