Clocking effect on the hydraulic performance and internal flow characteristics of a multistage centrifugal pump

Clocking effect on the hydraulic performance and internal flow characteristics of a multistage centrifugal pump | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Clocking effect on the hydraulic performance and internal flow characteristics of a multistage centrifugal pump tao xu, lulu zhai, Weiwei Liang, zheliang jin, lei jiang This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4415958/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract Multistage centrifugal pumps are widely used in offshore oil production, the petrochemical and coal-chemical industries, and nuclear power fields for their advantages of large flow rate, high pressure, and excellent operation stability. The impellers in such pumps are often fixed with circumferential phase differences to avoid the synergistic excitation vibration of unbalanced mass in the same phase, which is the main cause of the clocking effect in multistage centrifugal pumps. In this study, the clocking effect on the hydraulic and internal flow characteristics of the first three stages of a 5-stage pump under the designed flow rate conditions are investigated. 9 test schemes were designed with the orthogonal design method， and internal flow characteristics measurements were done at 3 different positions of the pump. The results indicate that the clocking effect has minor impacts on the hydraulic performances, with a maximum reduction of lift coefficient of 0.275% and a maximum reduction in efficiency of 1.3%. The impeller pressure pulsation shows a maximum phase departure angle of 90 and a maximum dominant frequency departure phase of 59.17 Hz. The internal flow characteristics of a multistage pump have been improved. Comparing the results of 9 test schemes reveals adjusting the clocking positions of the impellers of the pump can obtain better internal flow characteristics of the whole pump． multistage centrifugal pump clocking effect pressure pulsation entropy generation Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-4415958","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":302770494,"identity":"7c2750a9-a479-454c-9bab-ac9f4ebc070c","order_by":0,"name":"tao xu","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAApUlEQVRIiWNgGAWjYNCCCgZmNhKUMwPxGZK1MLaR4iSDG/kHP3ycV8fOJ938gOHnDiK0SM5IZpacuY2NmU3mmAFj7xkitPBLJDNI827jYWaTyGFgJsqFbBLJzL9550iQoAVoC5s0b4MBCVokex6bWc44lgD2y8FeYrQYHE98fONDTV2y/Ozmhw9+khLayQwSDAwHSNDAwGAH0jIKRsEoGAWjACsAAKJvKcqtPkPJAAAAAElFTkSuQmCC","orcid":"","institution":"Zhejiang Industry Polytechnic College","correspondingAuthor":true,"prefix":"","firstName":"tao","middleName":"","lastName":"xu","suffix":""},{"id":302770495,"identity":"344dff97-9ed7-45db-8375-fdc2dcbd1747","order_by":1,"name":"lulu zhai","email":"","orcid":"","institution":"Zhejiang Sci-Tech University","correspondingAuthor":false,"prefix":"","firstName":"lulu","middleName":"","lastName":"zhai","suffix":""},{"id":302770496,"identity":"b6afd1ea-e1ba-4c30-af58-95b2fb29ab8d","order_by":2,"name":"Weiwei Liang","email":"","orcid":"","institution":"Zhejiang Industry Polytechnic College","correspondingAuthor":false,"prefix":"","firstName":"Weiwei","middleName":"","lastName":"Liang","suffix":""},{"id":302770497,"identity":"34d9fa0b-e781-4eca-9b16-3552417adc52","order_by":3,"name":"zheliang jin","email":"","orcid":"","institution":"Zhejiang Industry Polytechnic College","correspondingAuthor":false,"prefix":"","firstName":"zheliang","middleName":"","lastName":"jin","suffix":""},{"id":302770498,"identity":"6c15441b-4664-47de-838a-af24f867c764","order_by":4,"name":"lei jiang","email":"","orcid":"","institution":"Zhejiang Industry Polytechnic College","correspondingAuthor":false,"prefix":"","firstName":"lei","middleName":"","lastName":"jiang","suffix":""}],"badges":[],"createdAt":"2024-05-14 02:38:26","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-4415958/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-4415958/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":57575854,"identity":"bc6c506b-4b75-43fc-87da-f8b3011352b4","added_by":"auto","created_at":"2024-06-02 18:31:55","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":1661172,"visible":true,"origin":"","legend":"","description":"","filename":"Clockingeffectonthehydraulicperformanceandinternalflowcharacteristicsofamultistagecentrifugalpump.pdf","url":"https://assets-eu.researchsquare.com/files/rs-4415958/v1_covered_5ac5171b-6474-4a00-b2f0-0700fe9532a1.pdf"}],"financialInterests":"No competing interests reported.","formattedTitle":"Clocking effect on the hydraulic performance and internal flow characteristics of a multistage centrifugal pump","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":true,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true},"keywords":"multistage centrifugal pump, clocking effect, pressure pulsation, entropy generation","lastPublishedDoi":"10.21203/rs.3.rs-4415958/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-4415958/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"Multistage centrifugal pumps are widely used in offshore oil production, the petrochemical and coal-chemical industries, and nuclear power fields for their advantages of large flow rate, high pressure, and excellent operation stability. The impellers in such pumps are often fixed with circumferential phase differences to avoid the synergistic excitation vibration of unbalanced mass in the same phase, which is the main cause of the clocking effect in multistage centrifugal pumps. In this study, the clocking effect on the hydraulic and internal flow characteristics of the first three stages of a 5-stage pump under the designed flow rate conditions are investigated. 9 test schemes were designed with the orthogonal design method， and internal flow characteristics measurements were done at 3 different positions of the pump. The results indicate that the clocking effect has minor impacts on the hydraulic performances, with a maximum reduction of lift coefficient of 0.275% and a maximum reduction in efficiency of 1.3%. The impeller pressure pulsation shows a maximum phase departure angle of 90 and a maximum dominant frequency departure phase of 59.17 Hz. 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