Experimental investigation of the influence of an orifice plate on the pressure pulsation amplitude in the pulsating flow in a straight pipe

Abstract A combination of experimental and numerical simulation was carried out to analyze influence of trailing edge position of splitter blade on the pressure fluctuation in low specific pumps with and without splitter blades under different flow rates. Performance experiments and PIV tests were performed to verify the results of numerical calculation. Several monitor points were placed in the calculation model pump to collect the pressure fluctuation signals, which were processed by Fast Fourier Transform to obtain the frequency results for further analysis. Besides, turbulence intensity and relative velocity distribution were also analyzed in regions of impeller and volute. The results showed that compared with prototype without splitter blade and the splitter blade schemes, when the trailing edge of splitter blade deviates to the suction side of main blade, the maximum pressure pulsation amplitudes are the lowest at different monitoring points of model pump. And the variation of pressure pulsation amplitude in this scheme is relatively stable with the change of flow rates compared with other schemes. Furthermore, the splitter blade scheme with an appropriate trailing edge position has the lowest average turbulence intensity and optimal relative velocity distribution in main flow passage component. Therefore, this paper proposes a reference scheme of the trailing edge position of the splitter blade to effectively decrease predominate pressure pulsation amplitude.

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An Experimental Investigation of Heat Transfer Characteristics of Pulsating Flow in Pipe

International Journal of Current Engineering and Technology ◽

10.14741/ijcet/22774106/6.5.2016.4 ◽

2011 ◽

Keyword(s):

Heat Transfer ◽

Experimental Investigation ◽

Pulsating Flow ◽

Heat Transfer Characteristics ◽

Transfer Characteristics

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An Experimental Investigation of Heat Transfer Enhancement by Pulsating Laminar Flow in a Triangular Grooved Channel

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.516-517.249 ◽

2012 ◽

Vol 516-517 ◽

pp. 249-252 ◽

Cited By ~ 1

Author(s):

Bing Chang Yang ◽

Dong Xu Jin

Keyword(s):

Heat Transfer ◽

Reynolds Number ◽

Heat Transfer Enhancement ◽

Strouhal Number ◽

Enhancement Factor ◽

Pulsating Flow ◽

Transfer Enhancement ◽

Maximum Heat ◽

Pulsation Amplitude ◽

Maximum Heat Transfer

Heat transfer enhancement by pulsating flow in a triangular grooved channel has been experimentally investigated. Effects of Reynolds number Re, Strouhal number St, pulsation amplitude A on the heat transfer enhancement were studied. The experimental results show that, the pulsating flow can significantly enhance heat transfer compared to the steady flow case, for instance, an enhancement of 115% is achieved at Re=400, A=0.5 and St=0.3. There exists an optimal Strouhal number corresponding to the maximum heat transfer enhancement factor. The heat transfer enhancement factor increases with the increase of Reynolds number and pulsation amplitude.

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Study on Resistance Characteristics of Single-Phase Pulsating Flow in the Horizontal Rectangular Channel

Volume 3: Thermal-Hydraulics; Turbines, Generators, and Auxiliaries ◽

10.1115/icone20-power2012-54257 ◽

2012 ◽

Author(s):

Jing-da Tian ◽

Pu-zhen Gao ◽

Bao Zhou

Keyword(s):

Atmospheric Pressure ◽

Single Phase ◽

Rectangular Channel ◽

Pulsating Flow ◽

Pulsation Period ◽

Resistance Characteristic ◽

Flow Pulsation ◽

Average Flow ◽

Pulsation Amplitude ◽

Inner Diameter

The resistance characteristic of single-phase pulsating flow was experimentally investigated. Using de-ionized water, experiments were conducted in the horizontal rectangular channel with 5.647mm inner diameter, considering three factors that were average flow, pulsation amplitude and pulsation period. Experiments focused on the turbulent region, and the atmospheric pressure and temperature conditions were maintained throughout the experiments. It was found that compared with steady flow in the same channel, the friction coefficient λ under the pulsating conditions was not only affected by the Reynolds number Re, but was also related to pulsation period and pulsation amplitude. And under the pulsating conditions, the Re-λ curve became pulsation circle, it resulted from the acceleration acting on the fluid and the phase difference between Re and λ.

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Experimental Investigation on Pulsating Flow in a Bend

Journal of Fluid Flow Heat and Mass Transfer ◽

10.11159/jffhmt.2015.004 ◽

2015 ◽

Cited By ~ 1

Author(s):

Masaru Sumida ◽

Takuroh Senoo

Keyword(s):

Experimental Investigation ◽

Pulsating Flow

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Numerical investigation of the effects of splitter blade deflection on the pressure pulsation in a low specific speed centrifugal pump

Proceedings of the Institution of Mechanical Engineers Part A Journal of Power and Energy ◽

10.1177/0957650919867176 ◽

2019 ◽

Vol 234 (4) ◽

pp. 420-432 ◽

Cited By ~ 3

Author(s):

Jinfeng Zhang ◽

Guidong Li ◽

Jieyun Mao ◽

Shouqi Yuan ◽

Yefei Qu ◽

...

Keyword(s):

Velocity Distribution ◽

Turbulence Intensity ◽

Pressure Fluctuation ◽

Relative Velocity ◽

Pressure Pulsation ◽

Maximum Pressure ◽

Flow Rates ◽

Pulsation Amplitude ◽

Low Specific Speed ◽

Specific Speed

A combination of experimental and numerical simulation was carried out to analyze the influences of the splitter blade deflection on the performance and pressure fluctuation in low specific speed pumps with and without splitter blades under different flow rates. Performance experiments and particle image velocimetry (PIV) tests were performed to verify the results of the numerical calculation. Several monitoring points were placed in the calculation model pump to collect the pressure fluctuation signals, which were processed by Fast Fourier Transform to obtain the frequency results for further analysis. In addition, turbulence intensity and relative velocity distribution were also analyzed in the regions of the impeller and volute. The results showed that compared with a prototype without a splitter blade and the splitter blade schemes, the maximum pressure pulsation amplitudes are the lowest at different monitoring points of the model pump when the splitter blade deflects to the suction side of the main blade. The variation of pressure pulsation amplitude in this scheme is relatively stable with the change of flow rates compared with other schemes. Furthermore, the impeller scheme with an appropriate deflection of the splitter blade has the lowest turbulence intensity and optimal relative velocity distribution in the main flow passage. Therefore, this paper proposes a reference scheme of the impeller with the splitter blade to effectively decrease the predominate pressure pulsation amplitude.

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