{"id":45207,"date":"2019-10-17T18:38:24","date_gmt":"2019-10-17T17:38:24","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/quest-ce-que-lefficacite-isentropique-turbine-compresseur-buse-definition\/"},"modified":"2020-02-23T15:50:42","modified_gmt":"2020-02-23T14:50:42","slug":"quest-ce-que-lefficacite-isentropique-turbine-compresseur-buse-definition","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-lefficacite-isentropique-turbine-compresseur-buse-definition\/","title":{"rendered":"Qu&#8217;est-ce que l&#8217;efficacit\u00e9 isentropique &#8211; Turbine \/ Compresseur \/ Buse &#8211; D\u00e9finition"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">L&#8217;efficacit\u00e9 isentropique est le rapport entre le travail r\u00e9el et le travail dans des conditions isentropiques.\u00a0Il est g\u00e9n\u00e9ralement d\u00e9fini pour les turbines, les compresseurs et les buses.\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-60 lgc-tablet-grid-60 lgc-mobile-grid-100 lgc-equal-heights lgc-first\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2>Efficacit\u00e9 Isentropique &#8211; Turbine, Compresseur, Buse<\/h2>\n<p>Dans les chapitres pr\u00e9c\u00e9dents, nous avons suppos\u00e9 que la dilatation du gaz \u00e9tait\u00a0<strong>isentropique<\/strong>\u00a0et nous avons donc utilis\u00e9\u00a0<strong>T\u00a0<sub>4, soit<\/sub><\/strong>\u00a0\u00a0la temp\u00e9rature de sortie du gaz.\u00a0Ces hypoth\u00e8ses ne sont applicables qu&#8217;avec les cycles id\u00e9aux.<\/p>\n<p>La plupart\u00a0<strong>des dispositifs \u00e0 d\u00e9bit constant<\/strong>\u00a0(turbines, compresseurs, buses) fonctionnent dans\u00a0<strong>des conditions adiabatiques<\/strong>\u00a0, mais ils ne sont pas vraiment isentropiques mais plut\u00f4t id\u00e9alis\u00e9s comme isentropiques \u00e0 des fins de calcul.\u00a0Nous d\u00e9finissons les param\u00e8tres\u00a0<strong><em>\u03b7\u00a0<\/em><\/strong><strong><em><sub>T<\/sub><\/em><\/strong><strong><em>\u00a0,\u00a0<\/em><\/strong>\u00a0<strong><em>\u03b7\u00a0<\/em><\/strong><strong><em><sub>C<\/sub><\/em><\/strong><strong><em>\u00a0, \u03b7\u00a0<\/em><\/strong><strong><em><sub>N<\/sub><\/em><\/strong><strong><em>\u00a0en<\/em><\/strong>\u00a0tant que\u00a0<strong>rapport<\/strong>\u00a0entre\u00a0<strong>le travail r\u00e9el effectu\u00e9<\/strong>\u00a0par appareil et celui\u00a0<strong>par appareil utilis\u00e9 dans des conditions isentropiques<\/strong>\u00a0(dans le cas d\u2019une turbine).\u00a0Ce rapport est connu sous le nom d&#8217;\u00a0<strong>efficacit\u00e9 de<\/strong>\u00a0la\u00a0<strong>turbine, du compresseur et de la buse isentropique<\/strong>\u00a0.<\/p>\n<p>Ces param\u00e8tres d\u00e9crivent l&#8217;efficacit\u00e9 avec laquelle une turbine, un compresseur ou une buse se rapproche d&#8217;un dispositif isentropique correspondant.\u00a0Ce param\u00e8tre r\u00e9duit l&#8217;efficacit\u00e9 globale et le rendement du travail.\u00a0Pour les turbines, la valeur de\u00a0<strong><em>\u03b7\u00a0<\/em><\/strong><strong><em><sub>T<\/sub><\/em><\/strong>\u00a0est g\u00e9n\u00e9ralement comprise entre 0,7 et 0,9 (70\u201390%).<\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Isentropic-Efficiency-equations.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-17298 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Isentropic-Efficiency-equations.png\" alt=\"Efficacit\u00e9 isentropique - \u00e9quations\" width=\"532\" height=\"357\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Isentropic-Efficiency-equations.png\" \/><\/a><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-40 lgc-tablet-grid-40 lgc-mobile-grid-100 lgc-equal-heights lgc-last\">\n<div class=\"inside-grid-column\">\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Isentropic-vs.-adiabatic-compression.png\"><img loading=\"lazy\" class=\"aligncenter size-medium wp-image-17268 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Isentropic-vs.-adiabatic-compression-274x300.png\" alt=\"Compression isentropique vs adiabatique\" width=\"274\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Isentropic-vs.-adiabatic-compression-274x300.png\" \/><\/a><\/p>\n<figure id=\"attachment_17267\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-17267\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Isentropic-vs.-adiabatic-expansion.png\"><img loading=\"lazy\" class=\"size-medium wp-image-17267 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Isentropic-vs.-adiabatic-expansion-276x300.png\" alt=\"Expansion isentropique vs adiabatique\" width=\"276\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Isentropic-vs.-adiabatic-expansion-276x300.png\" \/><\/a><figcaption id=\"caption-attachment-17267\" class=\"wp-caption-text\">Le processus isentropique est un cas particulier de processus adiabatiques.\u00a0C&#8217;est un processus adiabatique r\u00e9versible.\u00a0Un processus isentropique peut \u00e9galement \u00eatre appel\u00e9 processus \u00e0 entropie constante.<\/figcaption><\/figure>\n<\/div>\n<\/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>Exemple: efficacit\u00e9 de la turbine isentropique<\/h2>\n<figure id=\"attachment_17267\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-17267\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Isentropic-vs.-adiabatic-expansion.png\"><img loading=\"lazy\" class=\"size-medium wp-image-17267 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Isentropic-vs.-adiabatic-expansion-276x300.png\" alt=\"Expansion isentropique vs adiabatique\" width=\"276\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Isentropic-vs.-adiabatic-expansion-276x300.png\" \/><\/a><figcaption id=\"caption-attachment-17267\" class=\"wp-caption-text\">Le processus isentropique est un cas particulier de processus adiabatiques.\u00a0C&#8217;est un processus adiabatique r\u00e9versible.\u00a0Un processus isentropique peut \u00e9galement \u00eatre appel\u00e9 processus \u00e0 entropie constante.<\/figcaption><\/figure>\n<p>Supposons une\u00a0<strong>expansion isentropique<\/strong>\u00a0de l&#8217;h\u00e9lium (3 \u2192 4) dans une turbine \u00e0 gaz.\u00a0Dans cette turbine, l&#8217;\u00e9tage haute pression re\u00e7oit du gaz (point 3 sur la figure; p\u00a0<sub>3<\/sub>\u00a0=\u00a0<strong>6,7 MPa<\/strong>\u00a0; T\u00a0<sub>3<\/sub>\u00a0= 1190 K (917 \u00b0 C)) d&#8217;un \u00e9changeur de chaleur et l&#8217;\u00e9vacue vers un autre \u00e9changeur de chaleur, o\u00f9 la pression de sortie est p\u00a0<sub>4<\/sub>\u00a0=\u00a0<strong>2,78 MPa<\/strong>\u00a0(point 4)\u00a0<strong>.\u00a0<\/strong>La temp\u00e9rature (pour le processus isentropique) du gaz \u00e0 la sortie de la turbine est T\u00a0<sub>4s<\/sub>\u00a0= 839 K (566 \u00b0 C).<\/p>\n<p><strong>Calculez<\/strong>\u00a0le travail effectu\u00e9 par cette turbine et calculez la temp\u00e9rature r\u00e9elle \u00e0 la sortie de la turbine, lorsque le\u00a0<strong>rendement de la turbine isentropique<\/strong>\u00a0est\u00a0<strong>\u03b7\u00a0<\/strong><strong><sub>T<\/sub><\/strong><strong>\u00a0= 0,91 (91%)<\/strong>\u00a0.<\/p>\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<p><strong><span>Solution:<\/span><\/strong><\/p>\n<p><span>A partir de le premi\u00e8re principe de la thermodynamique, le travail effectu\u00e9 par turbine dans un processus isentropique peut \u00eatre calcul\u00e9 \u00e0 partir de:<\/span><\/p>\n<p><strong><span>W\u00a0<\/span><\/strong><strong><sub><span>T<\/span><\/sub><\/strong><strong><span>\u00a0= h\u00a0<\/span><\/strong><strong><sub><span>3<\/span><\/sub><\/strong><strong><span>\u00a0&#8211; h\u00a0<\/span><\/strong><strong><sub><span>4s<\/span><\/sub><\/strong><strong><span>\u00a0\u00a0\u00a0\u00a0\u00a0\u2192 W\u00a0<\/span><\/strong><strong><sub><span>Ts<\/span><\/sub><\/strong><strong><span>\u00a0=\u00a0<\/span><em><span>c\u00a0<\/span><\/em><\/strong><strong><em><sub><span>p<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0(T\u00a0<\/span><\/em><\/strong><strong><em><sub><span>3<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0&#8211; T\u00a0<\/span><\/em><\/strong><strong><em><sub><span>4s<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0)<\/span><\/em><\/strong><\/p>\n<p><span>D&#8217;apr\u00e8s la loi des gaz parfaits, nous savons que la chaleur sp\u00e9cifique molaire d&#8217;un gaz parfait monoatomique est:<\/span><\/p>\n<p><strong><em><span>C\u00a0<\/span><\/em><\/strong><strong><em><sub><span>v<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0= 3 \/ 2R = 12,5 J \/ mol K<\/span><\/em><\/strong><span>\u00a0et<\/span><strong><em><span>\u00a0C\u00a0<\/span><\/em><\/strong><strong><em><sub><span>p<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0= C\u00a0<\/span><\/em><\/strong><strong><em><sub><span>v<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0+ R = 5 \/ 2R = 20,8 J \/ mol K<\/span><\/em><\/strong><\/p>\n<p><span>Nous transf\u00e9rons les capacit\u00e9s calorifiques sp\u00e9cifiques en unit\u00e9s de\u00a0<\/span><strong><span>J \/ kg K via:<\/span><\/strong><\/p>\n<p><strong><em><span>c\u00a0<\/span><\/em><\/strong><strong><em><sub><span>p<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0= C\u00a0<\/span><\/em><\/strong><strong><em><sub><span>p<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0.\u00a01 \/ M (poids molaire de l&#8217;h\u00e9lium) = 20,8 x 4,10\u00a0<\/span><\/em><\/strong><strong><em><sup><span>-3<\/span><\/sup><\/em><\/strong><strong><em><span>\u00a0= 5200 J \/ kg K<\/span><\/em><\/strong><\/p>\n<p><span>Le travail effectu\u00e9 par turbine \u00e0 gaz en proc\u00e9d\u00e9 isentropique est alors:<\/span><\/p>\n<p><strong><em><span>W\u00a0<\/span><\/em><\/strong><strong><em><sub><span>T, s<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0= c\u00a0<\/span><\/em><\/strong><strong><em><sub><span>p<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0(T\u00a0<\/span><\/em><\/strong><strong><em><sub><span>3<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0&#8211; T\u00a0<\/span><\/em><\/strong><strong><em><sub><span>4s<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0) = 5200 x (1190 &#8211; 839) = 1,825 MJ \/ kg<\/span><\/em><\/strong><\/p>\n<p><span>Le travail r\u00e9el effectu\u00e9 par la turbine \u00e0 gaz en processus adiabatique est alors:<\/span><br \/>\n<strong><em><span>W\u00a0<\/span><\/em><\/strong><strong><em><sub><span>T, r\u00e9el<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0= c\u00a0<\/span><\/em><\/strong><strong><em><sub><span>p<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0(T\u00a0<\/span><\/em><\/strong><strong><em><sub><span>3<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0&#8211; T\u00a0<\/span><\/em><\/strong><strong><em><sub><span>4s<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0).\u00a0<\/span><\/em><\/strong><strong><em><span>\u03b7\u00a0<\/span><\/em><\/strong><strong><em><sub><span>T<\/span><\/sub><\/em><\/strong>\u00a0<strong><em><span>= 5200 x (1190 &#8211; 839) x 0,91 = 1,661 MJ \/ kg<\/span><\/em><\/strong><\/p>\n<\/div>\n<\/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\"><\/div>\n<\/div>\n<\/div>\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","protected":false},"excerpt":{"rendered":"<p>L&#8217;efficacit\u00e9 isentropique est le rapport entre le travail r\u00e9el et le travail dans des conditions isentropiques.\u00a0Il est g\u00e9n\u00e9ralement d\u00e9fini pour les turbines, les compresseurs et les buses.\u00a0G\u00e9nie thermique Efficacit\u00e9 Isentropique &#8211; Turbine, Compresseur, Buse Dans les chapitres pr\u00e9c\u00e9dents, nous avons suppos\u00e9 que la dilatation du gaz \u00e9tait\u00a0isentropique\u00a0et nous avons donc utilis\u00e9\u00a0T\u00a04, soit\u00a0\u00a0la temp\u00e9rature de sortie &#8230; <a title=\"Qu&#8217;est-ce que l&#8217;efficacit\u00e9 isentropique &#8211; Turbine \/ Compresseur \/ Buse &#8211; D\u00e9finition\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-lefficacite-isentropique-turbine-compresseur-buse-definition\/\" aria-label=\"En savoir plus sur Qu&#8217;est-ce que l&#8217;efficacit\u00e9 isentropique &#8211; Turbine \/ Compresseur \/ Buse &#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 l&#039;efficacit\u00e9 isentropique - Turbine \/ Compresseur \/ Buse - D\u00e9finition<\/title>\n<meta name=\"description\" content=\"L&#039;efficacit\u00e9 isentropique est le rapport entre le travail r\u00e9el et le travail dans des conditions isentropiques. 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