{"id":672988,"date":"2024-09-24T17:00:31","date_gmt":"2024-09-24T16:00:31","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=672988"},"modified":"2024-09-24T17:00:31","modified_gmt":"2024-09-24T16:00:31","slug":"hieu-ung-coanda-giup-voi-phun-tang-luc-nang-nhu-the-nao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/hieu-ung-coanda-giup-voi-phun-tang-luc-nang-nhu-the-nao\/","title":{"rendered":"Hi\u1ec7u \u1ee9ng Coanda gi\u00fap v\u00f2i phun t\u0103ng l\u1ef1c n\u00e2ng nh\u01b0 th\u1ebf n\u00e0o?"},"content":{"rendered":"<p class=\"sidekick\">Hi\u1ec7u \u1ee9ng Coanda gi\u00fap v\u00f2i phun t\u0103ng l\u1ef1c n\u00e2ng b\u1eb1ng c\u00e1ch l\u00e0m l\u1ec7ch lu\u1ed3ng kh\u00ed, t\u1ea1o \u00e1p su\u1ea5t ch\u00eanh l\u1ec7ch, t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t v\u00e0 ki\u1ec3m so\u00e1t d\u00f2ng ch\u1ea3y t\u1ed1t h\u01a1n.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/hieu_ung_coanda_giup_voi_phun_tang_luc_nang_nhu_the_nao.png\" alt=\"Hi\u1ec7u \u1ee9ng Coanda gi\u00fap v\u00f2i phun t\u0103ng l\u1ef1c n\u00e2ng nh\u01b0 th\u1ebf n\u00e0o?\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>Hi\u1ec7u \u1ee9ng Coanda gi\u00fap v\u00f2i phun t\u0103ng l\u1ef1c n\u00e2ng nh\u01b0 th\u1ebf n\u00e0o?<\/h2>\n<p>Trong l\u0129nh v\u1ef1c k\u1ef9 thu\u1eadt nhi\u1ec7t, hi\u1ec7u \u1ee9ng Coanda \u0111\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c t\u0103ng l\u1ef1c n\u00e2ng c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb chuy\u1ec3n \u0111\u1ed9ng nh\u01b0 v\u00f2i phun. Hi\u1ec7u \u1ee9ng Coanda \u0111\u01b0\u1ee3c \u0111\u1eb7t t\u00ean theo nh\u00e0 khoa h\u1ecdc ng\u01b0\u1eddi Romania Henri Coanda, ng\u01b0\u1eddi \u0111\u00e3 kh\u00e1m ph\u00e1 ra r\u1eb1ng ch\u1ea5t l\u1ecfng c\u00f3 xu h\u01b0\u1edbng b\u00e1m v\u00e0o b\u1ec1 m\u1eb7t cong khi ch\u00fang di chuy\u1ec3n qua n\u00f3. Hi\u1ec7u \u1ee9ng n\u00e0y gi\u00fap t\u0103ng \u0111\u1ed9ng l\u1ef1c v\u00e0 t\u00ednh hi\u1ec7u qu\u1ea3 c\u1ee7a nhi\u1ec1u lo\u1ea1i thi\u1ebft b\u1ecb v\u00e0 c\u00f4ng ngh\u1ec7 kh\u00e1c nhau.<\/p>\n<h2>Hi\u1ec7u \u1ee9ng Coanda l\u00e0 g\u00ec?<\/h2>\n<p>Hi\u1ec7u \u1ee9ng Coanda m\u00f4 t\u1ea3 h\u00e0nh vi c\u1ee7a d\u00f2ng ch\u1ea5t l\u1ecfng (ho\u1eb7c kh\u00ed) khi n\u00f3 \u0111i d\u1ecdc theo m\u1ed9t b\u1ec1 m\u1eb7t cong. Thay v\u00ec di chuy\u1ec3n theo \u0111\u01b0\u1eddng th\u1eb3ng, d\u00f2ng ch\u1ea5t l\u1ecfng n\u00e0y s\u1ebd b\u00e1m theo b\u1ec1 m\u1eb7t cong do s\u1ef1 gi\u1ea3m \u00e1p su\u1ea5t g\u00e2y ra b\u1edfi d\u00f2ng ch\u1ea3y. Khi d\u00f2ng ch\u1ea5t l\u1ecfng r\u1ebd sang ph\u00eda cong, n\u00f3 t\u1ea1o ra m\u1ed9t v\u00f9ng c\u00f3 \u00e1p su\u1ea5t th\u1ea5p, t\u1eeb \u0111\u00f3 gi\u00fap d\u00f2ng ch\u1ea3y &#8220;d\u00ednh&#8221; ch\u1eb7t h\u01a1n v\u00e0o b\u1ec1 m\u1eb7t.<\/p>\n<h2>\u1ee8ng d\u1ee5ng trong v\u00f2i phun<\/h2>\n<p>Trong thi\u1ebft k\u1ebf c\u1ee7a v\u00f2i phun, hi\u1ec7u \u1ee9ng Coanda \u0111\u01b0\u1ee3c t\u1eadn d\u1ee5ng \u0111\u1ec3 t\u1ea1o ra l\u1ef1c n\u00e2ng b\u1ed5 sung. Khi d\u00f2ng kh\u00ed ho\u1eb7c ch\u1ea5t l\u1ecfng phun ra t\u1eeb v\u00f2i phun, n\u00f3 s\u1ebd b\u00e1m theo v\u1ecf b\u00ean ngo\u00e0i (th\u01b0\u1eddng l\u00e0 m\u1ed9t b\u1ec1 m\u1eb7t cong). \u0110i\u1ec1u n\u00e0y t\u1ea1o ra m\u1ed9t v\u00f9ng \u00e1p su\u1ea5t th\u1ea5p xung quanh v\u00f2i phun, gi\u00fap t\u0103ng l\u1ef1c n\u00e2ng.<\/p>\n<ul>\n<li>V\u00f2i phun c\u00f3 h\u00ecnh d\u00e1ng cong \u0111\u1ec3 t\u1eadn d\u1ee5ng hi\u1ec7u \u1ee9ng Coanda.<\/li>\n<li>\u0110i\u1ec1u n\u00e0y l\u00e0m gi\u1ea3m \u00e1p su\u1ea5t b\u00ean ngo\u00e0i v\u00e0 t\u1ea1o \u00e1p su\u1ea5t th\u1ea5p, d\u1eabn \u0111\u1ebfn t\u1ed1c \u0111\u1ed9 d\u00f2ng ch\u1ea3y t\u0103ng v\u00e0 l\u1ef1c n\u00e2ng c\u0169ng t\u0103ng theo.<\/li>\n<li>C\u00f4ng ngh\u1ec7 n\u00e0y \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng trong c\u00e1c thi\u1ebft b\u1ecb bay nh\u01b0 tr\u1ef1c th\u0103ng v\u00e0 m\u00e1y bay kh\u00f4ng ng\u01b0\u1eddi l\u00e1i, gi\u00fap c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t bay v\u00e0 kh\u1ea3 n\u0103ng c\u01a1 \u0111\u1ed9ng.<\/li>\n<\/ul>\n<h2>C\u00f4ng th\u1ee9c m\u00f4 t\u1ea3 l\u1ef1c n\u00e2ng<\/h2>\n<p>\u0110\u1ec3 \u0111\u1ecbnh l\u01b0\u1ee3ng l\u1ef1c n\u00e2ng \u0111\u01b0\u1ee3c t\u1ea1o ra b\u1edfi hi\u1ec7u \u1ee9ng Coanda, ch\u00fang ta c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng ph\u01b0\u01a1ng tr\u00ecnh Bernoulli:<\/p>\n<p>\\(P + \\frac{1}{2} \\rho v^2 + \\rho gh = h\u1eb1ng s\u1ed1\\)<\/p>\n<p>Trong \u0111\u00f3:<\/p>\n<ol>\n<li>\\(P\\) l\u00e0 \u00e1p su\u1ea5t c\u1ee7a d\u00f2ng ch\u1ea5t l\u1ecfng.<\/li>\n<li>\\(\\rho\\) l\u00e0 m\u1eadt \u0111\u1ed9 c\u1ee7a ch\u1ea5t l\u1ecfng.<\/li>\n<li>\\(v\\) l\u00e0 t\u1ed1c \u0111\u1ed9 c\u1ee7a ch\u1ea5t l\u1ecfng.<\/li>\n<li>\\(g\\) l\u00e0 gia t\u1ed1c tr\u1ecdng tr\u01b0\u1eddng.<\/li>\n<li>\\(h\\) l\u00e0 \u0111\u1ed9 cao so v\u1edbi m\u1eb7t \u0111\u1ea5t.<\/li>\n<\/ol>\n<p>\u00c1p d\u1ee5ng nguy\u00ean l\u00fd n\u00e0y v\u00e0o hi\u1ec7u \u1ee9ng Coanda, ch\u00fang ta c\u00f3 th\u1ec3 th\u1ea5y r\u1eb1ng s\u1ef1 gi\u1ea3m \u00e1p su\u1ea5t \u1edf v\u00f9ng cong gi\u00fap t\u0103ng t\u1ed1c \u0111\u1ed9 v\u00e0 do \u0111\u00f3 t\u0103ng l\u1ef1c n\u00e2ng c\u1ee7a d\u00f2ng ch\u1ea3y phun ra t\u1eeb v\u00f2i.<\/p>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>Hi\u1ec7u \u1ee9ng Coanda l\u00e0 m\u1ed9t hi\u1ec7n t\u01b0\u1ee3ng r\u1ea5t h\u1eefu \u00edch trong k\u1ef9 thu\u1eadt nhi\u1ec7t v\u00e0 kh\u00ed \u0111\u1ed9ng h\u1ecdc, gi\u00fap t\u0103ng l\u1ef1c n\u00e2ng c\u1ee7a v\u00f2i phun v\u00e0 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t c\u1ee7a nhi\u1ec1u thi\u1ebft b\u1ecb bay. B\u1eb1ng c\u00e1ch hi\u1ec3u v\u00e0 t\u1eadn d\u1ee5ng hi\u1ec7u \u1ee9ng n\u00e0y, c\u00e1c k\u1ef9 s\u01b0 c\u00f3 th\u1ec3 thi\u1ebft k\u1ebf c\u00e1c h\u1ec7 th\u1ed1ng hi\u1ec7u qu\u1ea3 h\u01a1n, ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng h\u01a1n v\u00e0 c\u00f3 kh\u1ea3 n\u0103ng c\u01a1 \u0111\u1ed9ng t\u1ed1t h\u01a1n.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hi\u1ec7u \u1ee9ng Coanda gi\u00fap v\u00f2i phun t\u0103ng l\u1ef1c n\u00e2ng b\u1eb1ng c\u00e1ch l\u00e0m l\u1ec7ch lu\u1ed3ng kh\u00ed, t\u1ea1o \u00e1p su\u1ea5t ch\u00eanh l\u1ec7ch, t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t v\u00e0 ki\u1ec3m so\u00e1t d\u00f2ng ch\u1ea3y t\u1ed1t h\u01a1n.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[132],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - 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