Pub Date : 2013-12-01DOI: 10.3969/J.ISSN.1674-8530.2013.12.001
A. Bayeul-Lainé, P. Dupont, G. Cavazzini, A. Dazin, G. Bois, O. Roussette
The paper presents analysis of the performance and the internal flow behaviour in the vaned diffuser of a radial flow pump using PIV (Particle Image Velocimetry) and pressure probe traverses. PIV measurements have already been performed at middle height inside one diffuser channel passage for a given speed of rotation and various mass flow rates. These results have been already presented in several previous communications. New experiments have been performed using a three-hole pressure probe traverses from hub to shroud diffuser width at different radial locations between the two diffuser geometrical throats. Numerical simulations are also realized with the commercial codes Star CCM+ 7.02.011 and CFX. Frozen rotor and fully unsteady calculations of the whole pump have been performed. Comparisons between numerical results, previous experimental PIV results and new probe traverses one's are presented and discussed for one mass flow rate. In this respect, a first attempt to take into account fluid leakages between the rotating and fixed part of the pump has been checked since it may affect the real flow structure inside the diffuser.
{"title":"Comparisons between numerical calculations and measurements in vaned diffuser of SHF impeller","authors":"A. Bayeul-Lainé, P. Dupont, G. Cavazzini, A. Dazin, G. Bois, O. Roussette","doi":"10.3969/J.ISSN.1674-8530.2013.12.001","DOIUrl":"https://doi.org/10.3969/J.ISSN.1674-8530.2013.12.001","url":null,"abstract":"The paper presents analysis of the performance and the internal flow behaviour in the vaned diffuser of a radial flow pump using PIV (Particle Image Velocimetry) and pressure probe traverses. PIV measurements have already been performed at middle height inside one diffuser channel passage for a given speed of rotation and various mass flow rates. These results have been already presented in several previous communications. New experiments have been performed using a three-hole pressure probe traverses from hub to shroud diffuser width at different radial locations between the two diffuser geometrical throats. Numerical simulations are also realized with the commercial codes Star CCM+ 7.02.011 and CFX. Frozen rotor and fully unsteady calculations of the whole pump have been performed. Comparisons between numerical results, previous experimental PIV results and new probe traverses one's are presented and discussed for one mass flow rate. In this respect, a first attempt to take into account fluid leakages between the rotating and fixed part of the pump has been checked since it may affect the real flow structure inside the diffuser.","PeriodicalId":53624,"journal":{"name":"排灌机械工程学报","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89564111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-11-01DOI: 10.3969/J.ISSN.1674-8530.2012.06.004
Li Cheng, B. Esch, Chao Liu, Jiren Zhou, Yan Jin
Fluctuations of fluid pressure in hydraulic machinery can cause resonance and fatigue da-mage of blades. In order to study fluid-induced forces, which are caused by impeller-diffuser interaction, unsteady radial forces due such an effect was conducted in a mixed-flow pump with a vaned diffuser by using CFD computation and model experiment. A closed-loop test rig was built for the pump and a co-rotating dynamometer was installed between the impeller and the pump shaft to measure the instantaneous forces and moments on the impeller. The dynamic behavior of the experimental rotor-shaft system was determined by carrying out extensive calibrations. The measured forces at the blade passing frequency showed an unexpected dependency on flow rate. Another important observation was that the blade excitation forces cause the impeller to whirl in the direction opposite to shaft rotation. The computed global characteristics and the magnitude of blade interaction forces showed good agreement with measurements, respectively. The measured results were compared with the unsteady ones estimated by using CFD code-Fluent. Over a large range of flow rates, the trend of force variation agrees well with the measurements. The reasons for deviation of prediction from experiment were explained.
{"title":"Radial forces of waterjet propulsion mixed-flow pump","authors":"Li Cheng, B. Esch, Chao Liu, Jiren Zhou, Yan Jin","doi":"10.3969/J.ISSN.1674-8530.2012.06.004","DOIUrl":"https://doi.org/10.3969/J.ISSN.1674-8530.2012.06.004","url":null,"abstract":"Fluctuations of fluid pressure in hydraulic machinery can cause resonance and fatigue da-mage of blades. In order to study fluid-induced forces, which are caused by impeller-diffuser interaction, unsteady radial forces due such an effect was conducted in a mixed-flow pump with a vaned diffuser by using CFD computation and model experiment. A closed-loop test rig was built for the pump and a co-rotating dynamometer was installed between the impeller and the pump shaft to measure the instantaneous forces and moments on the impeller. The dynamic behavior of the experimental rotor-shaft system was determined by carrying out extensive calibrations. The measured forces at the blade passing frequency showed an unexpected dependency on flow rate. Another important observation was that the blade excitation forces cause the impeller to whirl in the direction opposite to shaft rotation. The computed global characteristics and the magnitude of blade interaction forces showed good agreement with measurements, respectively. The measured results were compared with the unsteady ones estimated by using CFD code-Fluent. Over a large range of flow rates, the trend of force variation agrees well with the measurements. The reasons for deviation of prediction from experiment were explained.","PeriodicalId":53624,"journal":{"name":"排灌机械工程学报","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82656842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-07-01DOI: 10.3969/J.ISSN.1674-8530.2012.04.012
Li Cheng, Chao Liu, B. Esch, F. Tang, Yan Jin, Jiren Zhou
In order to establish a relationship between flow pattern and hydraulic performance of a tubular pump, the flow pattern and hydraulic performance at a low flow rate, best efficiency point and a high flow rate were investigated by means of flow simulation, performance test and PIV measurement in a tubular pump. The steady flow field in the pump was obtained through solving the time-averaged N-S equations in the multiple reference frames (MRF) with the help of the SIMPLEC algorithm and the RNG k-e turbulence model. The flow patterns in the pump were analyzed at different operating points. There was a large recirculation zone before the blades inlet when the pump operated at the low flow rate. The flow patterns were fine and there was no any reverse flow regions in the pump when it worked at the BEP (Best Efficiency Point) and the high flow rate. The results indicated the hydraulic loss in the suction pipe is similar to that in a normal pipe, but the hydraulic loss in the discharge pipe depended on operating points. A minimum hydraulic loss in the discharge appeared at the BEP. The estimated performance was in agreement with the test data, both the predicted flow patterns and the PIV measurements showed that there was remarked reverse flow region in front of blades near the tip and there existed a large separated flow zone near the hub downstream of blades at the low flow rate. Thus, attention should be paid on the flow pattern in impeller and guide vanes at a low flow rate in the optimal design of such a tubular pump.
{"title":"Flow pattern and hydraulic performance of tubular pump","authors":"Li Cheng, Chao Liu, B. Esch, F. Tang, Yan Jin, Jiren Zhou","doi":"10.3969/J.ISSN.1674-8530.2012.04.012","DOIUrl":"https://doi.org/10.3969/J.ISSN.1674-8530.2012.04.012","url":null,"abstract":"In order to establish a relationship between flow pattern and hydraulic performance of a tubular pump, the flow pattern and hydraulic performance at a low flow rate, best efficiency point and a high flow rate were investigated by means of flow simulation, performance test and PIV measurement in a tubular pump. The steady flow field in the pump was obtained through solving the time-averaged N-S equations in the multiple reference frames (MRF) with the help of the SIMPLEC algorithm and the RNG k-e turbulence model. The flow patterns in the pump were analyzed at different operating points. There was a large recirculation zone before the blades inlet when the pump operated at the low flow rate. The flow patterns were fine and there was no any reverse flow regions in the pump when it worked at the BEP (Best Efficiency Point) and the high flow rate. The results indicated the hydraulic loss in the suction pipe is similar to that in a normal pipe, but the hydraulic loss in the discharge pipe depended on operating points. A minimum hydraulic loss in the discharge appeared at the BEP. The estimated performance was in agreement with the test data, both the predicted flow patterns and the PIV measurements showed that there was remarked reverse flow region in front of blades near the tip and there existed a large separated flow zone near the hub downstream of blades at the low flow rate. Thus, attention should be paid on the flow pattern in impeller and guide vanes at a low flow rate in the optimal design of such a tubular pump.","PeriodicalId":53624,"journal":{"name":"排灌机械工程学报","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86491043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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