{"id":48003,"date":"2019-11-07T17:25:13","date_gmt":"2019-11-07T16:25:13","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-o-ciclo-otto-real-e-ideal-definicao\/"},"modified":"2019-11-07T17:25:13","modified_gmt":"2019-11-07T16:25:13","slug":"o-que-e-o-ciclo-otto-real-e-ideal-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-ciclo-otto-real-e-ideal-definicao\/","title":{"rendered":"O que \u00e9 o Ciclo Otto Real e Ideal &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\"><span>Ciclo Otto real e ideal.\u00a0Nesta se\u00e7\u00e3o, \u00e9 mostrado um ciclo Otto ideal, no qual existem muitas suposi\u00e7\u00f5es diferentes do ciclo Otto real.\u00a0Engenharia T\u00e9rmica<\/span><\/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><span>Compara\u00e7\u00e3o dos ciclos Otto reais e ideais<\/span><\/h2>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Otto-engine-vs.-Otto-cycle.png\"><img loading=\"lazy\" class=\"alignright  wp-image-17556 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Otto-engine-vs.-Otto-cycle.png\" alt=\"Motor Otto vs. ciclo Otto\" width=\"332\" height=\"556\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Otto-engine-vs.-Otto-cycle.png\" \/><\/a><span>Nesta se\u00e7\u00e3o, \u00e9 mostrado um\u00a0<\/span><strong><span>ciclo Otto ideal,<\/span><\/strong><span>\u00a0no qual existem muitas\u00a0<\/span><strong><span>suposi\u00e7\u00f5es<\/span><\/strong><span>\u00a0diferentes do\u00a0<\/span><strong><span>ciclo Otto real<\/span><\/strong><span>\u00a0.\u00a0As principais diferen\u00e7as entre o mecanismo Otto real e ideal aparecem na figura.\u00a0Na realidade, o ciclo ideal n\u00e3o ocorre e h\u00e1 muitas perdas associadas a cada processo.\u00a0Para um ciclo real, a forma do diagrama de pV \u00e9 semelhante ao ideal, mas a \u00e1rea (trabalho) delimitada pelo diagrama de pV \u00e9 sempre menor que o valor ideal.\u00a0O ciclo Otto ideal \u00e9 baseado nas seguintes premissas:<\/span><\/p>\n<ul>\n<li><strong><span>Ciclo fechado.\u00a0<\/span><\/strong><span>\u00a0A maior diferen\u00e7a entre os dois diagramas \u00e9 a simplifica\u00e7\u00e3o dos movimentos de admiss\u00e3o e escape no ciclo ideal.\u00a0No curso de escape, o calor Q\u00a0<\/span><sub><span>out<\/span><\/sub><span>\u00a0\u00e9 ejetado para o ambiente, em um motor real, o g\u00e1s sai do motor e \u00e9 substitu\u00eddo por uma nova mistura de ar e combust\u00edvel.<\/span><\/li>\n<li><strong><span>Adi\u00e7\u00e3o instant\u00e2nea de calor<\/span><\/strong><span>\u00a0(\u00a0<strong>adi\u00e7\u00e3o<\/strong>\u00a0isoc\u00f3rica de calor).\u00a0Em motores reais, a adi\u00e7\u00e3o de calor n\u00e3o \u00e9 instant\u00e2nea; portanto, o pico de press\u00e3o n\u00e3o est\u00e1 no TDC, mas logo ap\u00f3s o TDC.<\/span><\/li>\n<li><strong><span>Sem transfer\u00eancia de calor (adiab\u00e1tico)<\/span><\/strong>\n<ul>\n<li><span>Compress\u00e3o &#8211; O g\u00e1s (mistura combust\u00edvel-ar) \u00e9 comprimido adiabaticamente do estado 1 ao estado 2. Nos motores reais, sempre existem algumas inefici\u00eancias que reduzem a efici\u00eancia t\u00e9rmica.<\/span><\/li>\n<li><span>Expans\u00e3o.\u00a0O g\u00e1s (mistura combust\u00edvel-ar) se expande adiabaticamente do estado 3 para o estado 4.<\/span><\/li>\n<\/ul>\n<\/li>\n<li><strong><span>Combust\u00e3o completa<\/span><\/strong><span>\u00a0da mistura combust\u00edvel-ar.<\/span><\/li>\n<li><strong><span>Nenhum trabalho de bombeamento<\/span><\/strong><span>\u00a0.\u00a0Trabalho de bombeamento \u00e9 a diferen\u00e7a entre o trabalho realizado durante o golpe de escape e o trabalho realizado durante o golpe de admiss\u00e3o.\u00a0Nos ciclos reais, h\u00e1 uma diferen\u00e7a de press\u00e3o entre as press\u00f5es de exaust\u00e3o e de entrada.<\/span><\/li>\n<li><strong><span>Sem perda de purga<\/span><\/strong><span>\u00a0.\u00a0A perda de purga \u00e9 causada pela abertura precoce das v\u00e1lvulas de escape.\u00a0Isso resulta em perda de produ\u00e7\u00e3o durante o curso de expans\u00e3o.<\/span><\/li>\n<li><strong><span>Sem perda de impacto<\/span><\/strong><span>\u00a0.\u00a0A perda soprada \u00e9 causada pelo vazamento de gases comprimidos atrav\u00e9s de an\u00e9is de pist\u00e3o e outras fendas.<\/span><\/li>\n<li><strong><span>Sem perdas por atrito<\/span><\/strong><span>\u00a0.<\/span><\/li>\n<\/ul>\n<p><span>Essas suposi\u00e7\u00f5es e perdas simplificadoras levam ao fato de que a \u00e1rea fechada (trabalho) do diagrama de pV para um motor real \u00e9 significativamente menor que o tamanho da \u00e1rea (trabalho) envolvida pelo diagrama de pV do ciclo ideal.\u00a0Em outras palavras, o ciclo ideal do motor superestimar\u00e1 o trabalho l\u00edquido e, se os motores funcionarem na mesma velocidade, maior pot\u00eancia produzida pelo motor real em cerca de 20%.<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"inside-grid-column\"><\/div>\n<div><\/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>Este artigo \u00e9 baseado na tradu\u00e7\u00e3o autom\u00e1tica do artigo original em ingl\u00eas. Para mais informa\u00e7\u00f5es, consulte o artigo em ingl\u00eas. Voc\u00ea pode nos ajudar. Se voc\u00ea deseja corrigir a tradu\u00e7\u00e3o, envie-a para: translations@nuclear-power.com ou preencha o formul\u00e1rio de tradu\u00e7\u00e3o on-line. Agradecemos sua ajuda, atualizaremos a tradu\u00e7\u00e3o o mais r\u00e1pido poss\u00edvel. Obrigado.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Ciclo Otto real e ideal.\u00a0Nesta se\u00e7\u00e3o, \u00e9 mostrado um ciclo Otto ideal, no qual existem muitas suposi\u00e7\u00f5es diferentes do ciclo Otto real.\u00a0Engenharia T\u00e9rmica Compara\u00e7\u00e3o dos ciclos Otto reais e ideais Nesta se\u00e7\u00e3o, \u00e9 mostrado um\u00a0ciclo Otto ideal,\u00a0no qual existem muitas\u00a0suposi\u00e7\u00f5es\u00a0diferentes do\u00a0ciclo Otto real\u00a0.\u00a0As principais diferen\u00e7as entre o mecanismo Otto real e ideal aparecem na figura.\u00a0Na &#8230; <a title=\"O que \u00e9 o Ciclo Otto Real e Ideal &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-ciclo-otto-real-e-ideal-definicao\/\" aria-label=\"More on O que \u00e9 o Ciclo Otto Real e Ideal &#8211; Defini\u00e7\u00e3o\">Ler mais<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[14],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>O que \u00e9 o Ciclo Otto Real e Ideal - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Ciclo Otto real e ideal. 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