{"id":47967,"date":"2019-11-07T13:13:56","date_gmt":"2019-11-07T12:13:56","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-razao-de-pressao-ciclo-de-brayton-turbina-a-gas-definicao\/"},"modified":"2020-01-26T13:19:09","modified_gmt":"2020-01-26T12:19:09","slug":"o-que-e-razao-de-pressao-ciclo-de-brayton-turbina-a-gas-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-razao-de-pressao-ciclo-de-brayton-turbina-a-gas-definicao\/","title":{"rendered":"O que \u00e9 raz\u00e3o de press\u00e3o – Ciclo de Brayton – Turbina a g\u00e1s – Defini\u00e7\u00e3o"},"content":{"rendered":"
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Em geral, aumentar a taxa de press\u00e3o \u00e9 a maneira mais direta de aumentar a efici\u00eancia t\u00e9rmica geral de um ciclo de Brayton, porque o ciclo se aproxima do ciclo de Carnot.\u00a0Engenharia T\u00e9rmica<\/div>\n<\/div>\n
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Rela\u00e7\u00e3o de Press\u00e3o – Ciclo de Brayton – Turbina a G\u00e1s<\/h2>\n

A\u00a0efici\u00eancia t\u00e9rmica<\/strong>\u00a0em termos da\u00a0raz\u00e3o de press\u00e3o<\/strong>\u00a0do compressor\u00a0(PR = p\u00a02<\/sub>\u00a0\/ p\u00a01<\/sub>\u00a0), que \u00e9 o par\u00e2metro comumente usado:<\/p>\n

\"efici\u00eancia<\/a><\/p>\n

\"efici\u00eancia<\/a>Em geral,\u00a0aumentar a taxa de press\u00e3o<\/strong>\u00a0\u00e9 a maneira mais direta de aumentar a efici\u00eancia t\u00e9rmica geral de um ciclo de Brayton, porque o ciclo se aproxima do ciclo de Carnot.<\/p>\n

De acordo com\u00a0o princ\u00edpio de Carnot, \u00e9<\/a>\u00a0poss\u00edvel obter maiores efici\u00eancias aumentando a temperatura do g\u00e1s.<\/p>\n

Mas tamb\u00e9m h\u00e1\u00a0limites nas rela\u00e7\u00f5es de press\u00e3o<\/strong>\u00a0que podem ser usadas no ciclo.\u00a0A temperatura mais alta do ciclo ocorre no final do processo de combust\u00e3o e \u00e9 limitada pela\u00a0temperatura m\u00e1xima<\/strong>\u00a0que as\u00a0p\u00e1s<\/strong>\u00a0da\u00a0turbina<\/strong>\u00a0podem suportar.\u00a0Como de costume, considera\u00e7\u00f5es metal\u00fargicas (cerca de 1700 K) imp\u00f5em limites superiores \u00e0 efici\u00eancia t\u00e9rmica.<\/p>\n

\"Turbina<\/a>
Ciclos Brayton ideais com diferentes taxas de press\u00e3o e a mesma temperatura de entrada da turbina.<\/figcaption><\/figure>\n

Considere o efeito da taxa de press\u00e3o do compressor na efici\u00eancia t\u00e9rmica quando a temperatura de entrada da turbina estiver restrita \u00e0 temperatura m\u00e1xima permitida.\u00a0Existem dois diagramas Ts dos ciclos de Brayton com a mesma temperatura de entrada da turbina, mas diferentes propor\u00e7\u00f5es de press\u00e3o do compressor na imagem.\u00a0Como pode ser visto para uma temperatura de entrada de turbina fixa, a produ\u00e7\u00e3o l\u00edquida de trabalho por ciclo (W\u00a0net<\/sub>\u00a0= W\u00a0T<\/sub>\u00a0– W\u00a0C<\/sub>\u00a0) diminui com a raz\u00e3o de press\u00e3o (\u00a0Ciclo A<\/strong>\u00a0).\u00a0Mas o ciclo A tem maior efici\u00eancia.<\/p>\n

Por outro lado, o\u00a0Ciclo B<\/strong>\u00a0tem uma maior produ\u00e7\u00e3o l\u00edquida de trabalho por ciclo (\u00e1rea delimitada no diagrama) e, portanto, o maior trabalho l\u00edquido desenvolvido por unidade de fluxo de massa.\u00a0O trabalho produzido pelo ciclo vezes uma taxa de fluxo de massa atrav\u00e9s do ciclo \u00e9 igual \u00e0 pot\u00eancia produzida pela turbina a g\u00e1s.<\/p>\n

Portanto, com menos produ\u00e7\u00e3o de trabalho por ciclo (Ciclo A),\u00a0\u00e9 necess\u00e1ria\u00a0uma taxa de fluxo de massa maior (portanto, um\u00a0sistema maior<\/strong>\u00a0) para manter a mesma produ\u00e7\u00e3o de energia, o que pode n\u00e3o ser econ\u00f4mico.\u00a0Essa \u00e9 a principal considera\u00e7\u00e3o no projeto de turbinas a g\u00e1s, pois aqui os engenheiros devem equilibrar a efici\u00eancia t\u00e9rmica e a compacta\u00e7\u00e3o.\u00a0Nos projetos mais comuns, a raz\u00e3o de press\u00e3o de uma turbina a g\u00e1s varia de cerca de 11 a 16.<\/p>\n<\/div>\n<\/div>\n

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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<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Em geral, aumentar a taxa de press\u00e3o \u00e9 a maneira mais direta de aumentar a efici\u00eancia t\u00e9rmica geral de um ciclo de Brayton, porque o ciclo se aproxima do ciclo de Carnot.\u00a0Engenharia T\u00e9rmica Rela\u00e7\u00e3o de Press\u00e3o – Ciclo de Brayton – Turbina a G\u00e1s A\u00a0efici\u00eancia t\u00e9rmica\u00a0em termos da\u00a0raz\u00e3o de press\u00e3o\u00a0do compressor\u00a0(PR = p\u00a02\u00a0\/ p\u00a01\u00a0), que … 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":"\nO que \u00e9 raz\u00e3o de press\u00e3o - Ciclo de Brayton - Turbina a g\u00e1s - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Em geral, aumentar a taxa de press\u00e3o \u00e9 a maneira mais direta de aumentar a efici\u00eancia t\u00e9rmica geral de um ciclo de Brayton, porque o ciclo se aproxima do ciclo de Carnot. 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