{"id":46498,"date":"2019-10-22T12:47:57","date_gmt":"2019-10-22T11:47:57","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/quest-ce-que-la-tete-daspiration-positive-nette-definition\/"},"modified":"2020-03-02T12:18:42","modified_gmt":"2020-03-02T11:18:42","slug":"quest-ce-que-la-tete-daspiration-positive-nette-definition","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-tete-daspiration-positive-nette-definition\/","title":{"rendered":"Qu&#8217;est-ce que la t\u00eate d&#8217;aspiration positive nette &#8211; D\u00e9finition"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">La hauteur nette d&#8217;aspiration ou NPSH pour les pompes peut \u00eatre d\u00e9finie comme la diff\u00e9rence entre la pression d&#8217;aspiration et la pression de saturation du fluide.\u00a0G\u00e9nie thermique<\/div>\n<\/div>\n<div class=\"su-divider su-divider-style-dotted\"><\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2>T\u00eate d&#8217;aspiration positive nette<\/h2>\n<p><strong><br \/>\n<a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Net-Positive-Suction-Head-chart.png\"><img loading=\"lazy\" class=\"alignright wp-image-15002 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Net-Positive-Suction-Head-chart.png\" alt=\"T\u00eate d'aspiration positive nette\" width=\"435\" height=\"237\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Net-Positive-Suction-Head-chart.png\" \/><\/a>La<\/strong>\u00a0hauteur\u00a0<strong>nette d&#8217;aspiration<\/strong>\u00a0ou\u00a0<strong>NPSH<\/strong>\u00a0pour les pompes peut \u00eatre d\u00e9finie comme la\u00a0<strong>diff\u00e9rence<\/strong>\u00a0entre la\u00a0<strong>pression d&#8217;aspiration<\/strong>\u00a0et la\u00a0<strong>pression<\/strong>\u00a0de\u00a0<strong>saturation<\/strong>\u00a0du fluide, exprim\u00e9e en hauteur de la colonne de liquide.\u00a0NPSH est utilis\u00e9 pour mesurer \u00e0\u00a0<strong>quel point<\/strong>\u00a0un fluide est\u00a0<strong>proche<\/strong>\u00a0de conditions satur\u00e9es.\u00a0L&#8217;abaissement de la pression du c\u00f4t\u00e9 aspiration peut provoquer une\u00a0<a title=\"Cavitation dans les pompes centrifuges\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/centrifugal-pumps\/cavitation\/\"><strong>cavitation<\/strong><\/a>.\u00a0En cas de cavitation, l\u2019effondrement violent de la bulle de cavitation cr\u00e9e une onde de choc capable de sculpter des mat\u00e9riaux \u00e0 partir de composants internes de la pompe (g\u00e9n\u00e9ralement le bord d\u2019attaque de la roue) et de produire un bruit souvent d\u00e9crit comme \u00abpompage de gravier\u00bb.\u00a0De plus, l&#8217;augmentation in\u00e9vitable des vibrations peut entra\u00eener d&#8217;autres d\u00e9fauts m\u00e9caniques de la pompe et des \u00e9quipements associ\u00e9s.<\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Net-Positive-Suction-Head-definition.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-15003 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Net-Positive-Suction-Head-definition.png\" alt=\"T\u00eate d'aspiration positive nette - d\u00e9finition\" width=\"473\" height=\"145\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Net-Positive-Suction-Head-definition.png\" \/><\/a><\/p>\n<p>En g\u00e9n\u00e9ral, il existe deux t\u00eates d&#8217;aspiration d\u00e9finies en hydraulique:<\/p>\n<ul>\n<li><strong>NPSH disponible (NPSHa)<\/strong>\u00a0: pression absolue au port d&#8217;aspiration de la pompe.\u00a0NPSHa est une fonction de la temp\u00e9rature de l&#8217;eau.\u00a0Au fur et \u00e0 mesure que la temp\u00e9rature d&#8217;entr\u00e9e augmente, NPSHa diminue, car la pression de saturation diminue.<\/li>\n<li><strong>NPSH requis (NPSHR):<\/strong>\u00a0pression minimale requise \u00e0 l&#8217;orifice d&#8217;aspiration de la pompe pour l&#8217;emp\u00eacher de caviter.\u00a0NPSHa n&#8217;est pas fonction de la temp\u00e9rature de l&#8217;eau.<\/li>\n<\/ul>\n<p>NPSHA est une fonction de votre syst\u00e8me et doit \u00eatre calcul\u00e9, tandis que NPSHR est une fonction de la pompe et doit \u00eatre fourni par le fabricant de la pompe.\u00a0Pendant le fonctionnement, le NPSH disponible doit \u00eatre maintenu \u00e0 un niveau sup\u00e9rieur au NPSH requis par le fabricant de la pompe.\u00a0Il a \u00e9t\u00e9 constat\u00e9 que les taux de cavitation\u00a0<strong>augmentent rapidement<\/strong>\u00a0avec l&#8217;augmentation du d\u00e9bit volumique.\u00a0Cela se voit \u00e0 l&#8217;image: lorsque le d\u00e9bit volumique augmente, le NPSH requis augmente, mais le NPSH disponible diminue.<\/p>\n<h2><span>Comment augmenter le NPSH disponible?<\/span><\/h2>\n<p><span>Pour \u00e9viter la cavitation par aspiration, le NPSH disponible doit \u00eatre augment\u00e9 autant que possible.\u00a0La seule fa\u00e7on d&#8217;augmenter le NPSH disponible est d&#8217;augmenter la pression \u00e0 l&#8217;entr\u00e9e de la pompe:<\/span><\/p>\n<ul>\n<li><span>Baisser le niveau de la pompe<\/span><\/li>\n<li><span>Augmentez le niveau du r\u00e9servoir<\/span><\/li>\n<li><span>R\u00e9duction du r\u00e9gime moteur si possible<\/span><\/li>\n<li><span>R\u00e9duit\u00a0<\/span><a title=\"Perte de t\u00eate mineure - Pertes locales\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/minor-head-loss-local-losses\/\"><span>les pertes mineures en<\/span><\/a><span>\u00a0\u00a0amont de la pompe<\/span><\/li>\n<li><span>R\u00e9duit\u00a0<\/span><a title=\"Perte de t\u00eate majeure - Perte par friction\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/major-head-loss-friction-loss\/\"><span>les pertes importantes en<\/span><\/a><span>\u00a0\u00a0amont de la pompe<\/span>\n<ul>\n<li><span>Raccourcissez la longueur du tuyau<\/span><\/li>\n<li><span>Utilisez un tuyau plus lisse<\/span><\/li>\n<\/ul>\n<\/li>\n<li><span>Augmentation du diam\u00e8tre de l&#8217;\u0153il de la roue<\/span><\/li>\n<li><span>Utilisation d&#8217;une pompe d&#8217;appoint pour alimenter la pompe principale.<\/span><\/li>\n<\/ul>\n<\/div>\n<p>&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;.<\/p>\n<p>Cet article est bas\u00e9 sur la traduction automatique de l&#8217;article original en anglais. Pour plus d&#8217;informations, voir l&#8217;article en anglais. Pouvez vous nous aider Si vous souhaitez corriger la traduction, envoyez-la \u00e0 l&#8217;adresse: translations@nuclear-power.com ou remplissez le formulaire de traduction en ligne. Nous appr\u00e9cions votre aide, nous mettrons \u00e0 jour la traduction le plus rapidement possible. Merci<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>La hauteur nette d&#8217;aspiration ou NPSH pour les pompes peut \u00eatre d\u00e9finie comme la diff\u00e9rence entre la pression d&#8217;aspiration et la pression de saturation du fluide.\u00a0G\u00e9nie thermique T\u00eate d&#8217;aspiration positive nette La\u00a0hauteur\u00a0nette d&#8217;aspiration\u00a0ou\u00a0NPSH\u00a0pour les pompes peut \u00eatre d\u00e9finie comme la\u00a0diff\u00e9rence\u00a0entre la\u00a0pression d&#8217;aspiration\u00a0et la\u00a0pression\u00a0de\u00a0saturation\u00a0du fluide, exprim\u00e9e en hauteur de la colonne de liquide.\u00a0NPSH est utilis\u00e9 pour &#8230; <a title=\"Qu&#8217;est-ce que la t\u00eate d&#8217;aspiration positive nette &#8211; D\u00e9finition\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-tete-daspiration-positive-nette-definition\/\" aria-label=\"En savoir plus sur Qu&#8217;est-ce que la t\u00eate d&#8217;aspiration positive nette &#8211; D\u00e9finition\">Lire la suite<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[8],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Qu&#039;est-ce que la t\u00eate d&#039;aspiration positive nette - D\u00e9finition<\/title>\n<meta name=\"description\" content=\"La hauteur nette d&#039;aspiration ou NPSH pour les pompes peut \u00eatre d\u00e9finie comme la diff\u00e9rence entre la pression d&#039;aspiration et la pression de saturation du fluide. 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