{"id":709857,"date":"2024-08-20T19:07:49","date_gmt":"2024-08-20T18:07:49","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=709857"},"modified":"2024-08-20T19:07:49","modified_gmt":"2024-08-20T18:07:49","slug":"so-strouhal-trong-chat-long-la-gi","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/so-strouhal-trong-chat-long-la-gi\/","title":{"rendered":"S\u1ed1 Strouhal trong Ch\u1ea5t L\u1ecfng L\u00e0 G\u00ec?"},"content":{"rendered":"<p class=\"sidekick\">T\u00ecm hi\u1ec3u v\u1ec1 s\u1ed1 Strouhal trong ch\u1ea5t l\u1ecfng, m\u1ed9t \u0111\u1ea1i l\u01b0\u1ee3ng quan tr\u1ecdng trong k\u1ef9 thu\u1eadt nhi\u1ec7t, gi\u00fap \u0111\u00e1nh gi\u00e1 c\u00e1c hi\u1ec7n t\u01b0\u1ee3ng dao \u0111\u1ed9ng v\u00e0 d\u00f2ng ch\u1ea3y c\u1ee7a ch\u1ea5t l\u1ecfng.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/so_strouhal_trong_chat_long_la_gi.png\" alt=\"S\u1ed1 Strouhal trong Ch\u1ea5t L\u1ecfng L\u00e0 G\u00ec?\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>S\u1ed1 Strouhal trong Ch\u1ea5t L\u1ecfng L\u00e0 G\u00ec?<\/h2>\n<p>Trong l\u0129nh v\u1ef1c c\u01a1 h\u1ecdc ch\u1ea5t l\u1ecfng, s\u1ed1 Strouhal (vi\u1ebft t\u1eaft l\u00e0 St) l\u00e0 m\u1ed9t trong nh\u1eefng s\u1ed1 kh\u00f4ng th\u1ee9 nguy\u00ean quan tr\u1ecdng, \u0111\u1ea1i di\u1ec7n cho t\u1ea7n s\u1ed1 c\u1ee7a c\u00e1c hi\u1ec7n t\u01b0\u1ee3ng dao \u0111\u1ed9ng trong d\u00f2ng ch\u1ea5t l\u1ecfng. S\u1ed1 Strouhal \u0111\u01b0\u1ee3c \u0111\u1eb7t theo t\u00ean c\u1ee7a nh\u00e0 v\u1eadt l\u00fd ng\u01b0\u1eddi \u00c1o, Vincenc Strouhal, ng\u01b0\u1eddi \u0111\u00e3 nghi\u00ean c\u1ee9u v\u1ec1 c\u00e1c dao \u0111\u1ed9ng c\u1ee7a s\u1ee3i d\u00e2y trong ch\u1ea5t l\u1ecfng v\u00e0o cu\u1ed1i th\u1ebf k\u1ef7 19.<\/p>\n<h2>C\u00f4ng Th\u1ee9c T\u00ednh S\u1ed1 Strouhal<\/h2>\n<p>S\u1ed1 Strouhal \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a b\u1eb1ng c\u00f4ng th\u1ee9c sau:<\/p>\n<p><b>St = \\(\\frac{fL}{V}\\)<\/b><\/p>\n<ul>\n<li>f: T\u1ea7n s\u1ed1 \u0111\u1eb7c tr\u01b0ng c\u1ee7a hi\u1ec7n t\u01b0\u1ee3ng dao \u0111\u1ed9ng (Hz)<\/li>\n<li>L: Chi\u1ec1u d\u00e0i \u0111\u1eb7c tr\u01b0ng (m)<\/li>\n<li>V: T\u1ed1c \u0111\u1ed9 d\u00f2ng ch\u1ea3y (m\/s)<\/li>\n<\/ul>\n<p>C\u00f4ng th\u1ee9c tr\u00ean cho ph\u00e9p x\u00e1c \u0111\u1ecbnh t\u1ea7n s\u1ed1 c\u1ee7a hi\u1ec7n t\u01b0\u1ee3ng dao \u0111\u1ed9ng li\u00ean quan \u0111\u1ebfn c\u00e1c y\u1ebfu t\u1ed1 nh\u01b0 chi\u1ec1u d\u00e0i \u0111\u1eb7c tr\u01b0ng c\u1ee7a v\u1eadt th\u1ec3 v\u00e0 t\u1ed1c \u0111\u1ed9 d\u00f2ng ch\u1ea3y c\u1ee7a ch\u1ea5t l\u1ecfng.<\/p>\n<h2>\u1ee8ng D\u1ee5ng c\u1ee7a S\u1ed1 Strouhal<\/h2>\n<p>S\u1ed1 Strouhal c\u00f3 r\u1ea5t nhi\u1ec1u \u1ee9ng d\u1ee5ng trong c\u00e1c l\u0129nh v\u1ef1c kh\u00e1c nhau c\u1ee7a k\u1ef9 thu\u1eadt v\u00e0 v\u1eadt l\u00fd:<\/p>\n<ol>\n<li><b>Thi\u1ebft K\u1ebf \u0110\u01b0\u1eddng \u1ed0ng:<\/b> Trong thi\u1ebft k\u1ebf \u0111\u01b0\u1eddng \u1ed1ng v\u00e0 c\u00e1c h\u1ec7 th\u1ed1ng d\u1eabn ch\u1ea5t l\u1ecfng, s\u1ed1 Strouhal gi\u00fap d\u1ef1 \u0111o\u00e1n v\u00e0 ki\u1ec3m so\u00e1t hi\u1ec7n t\u01b0\u1ee3ng dao \u0111\u1ed9ng d\u00f2ng ch\u1ea3y, tr\u00e1nh c\u00e1c v\u1ea5n \u0111\u1ec1 nh\u01b0 rung \u0111\u1ed9ng hay m\u00e0i m\u00f2n qu\u00e1 m\u1ee9c.<\/li>\n<li><b>Aerodynamics:<\/b> Trong ng\u00e0nh h\u00e0ng kh\u00f4ng v\u00e0 thi\u1ebft k\u1ebf \u00f4 t\u00f4, s\u1ed1 Strouhal \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 nghi\u00ean c\u1ee9u s\u1ef1 dao \u0111\u1ed9ng c\u1ee7a kh\u00f4ng kh\u00ed xung quanh c\u00e1c v\u1eadt th\u1ec3 \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a h\u00ecnh d\u00e1ng v\u00e0 hi\u1ec7u qu\u1ea3 kh\u00ed \u0111\u1ed9ng h\u1ecdc.<\/li>\n<li><b>C\u00e1c Hi\u1ec7n T\u01b0\u1ee3ng T\u1ef1 Nhi\u00ean:<\/b> S\u1ed1 Strouhal c\u00f2n \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng trong nghi\u00ean c\u1ee9u c\u00e1c hi\u1ec7n t\u01b0\u1ee3ng t\u1ef1 nhi\u00ean nh\u01b0 s\u1ef1 dao \u0111\u1ed9ng c\u1ee7a c\u1ea7u c\u1ea1n khi gi\u00f3 th\u1ed5i qua, ho\u1eb7c s\u1ef1 di chuy\u1ec3n c\u1ee7a c\u00e1 trong n\u01b0\u1edbc.<\/li>\n<\/ol>\n<h2>V\u00ed D\u1ee5 C\u1ee5 Th\u1ec3<\/h2>\n<p>M\u1ed9t v\u00ed d\u1ee5 kh\u00e1 ph\u1ed5 bi\u1ebfn l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng dao \u0111\u1ed9ng c\u1ee7a c\u1ea7u d\u00e2y khi c\u00f3 gi\u00f3 th\u1ed5i qua. Khi gi\u00f3 th\u1ed5i qua c\u00e1c d\u00e2y c\u1ea7u, n\u00f3 t\u1ea1o ra nh\u1eefng dao \u0111\u1ed9ng m\u00e0 t\u1ea7n s\u1ed1 c\u1ee7a ch\u00fang c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n b\u1eb1ng s\u1ed1 Strouhal. N\u1ebfu t\u1ea7n s\u1ed1 n\u00e0y tr\u00f9ng v\u1edbi t\u1ea7n s\u1ed1 dao \u0111\u1ed9ng t\u1ef1 nhi\u00ean c\u1ee7a d\u00e2y c\u1ea7u, c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn hi\u1ec7n t\u01b0\u1ee3ng c\u1ed9ng h\u01b0\u1edfng v\u00e0 g\u00e2y h\u1ea1i cho c\u1ea7u.<\/p>\n<p>K\u1ebft lu\u1eadn, s\u1ed1 Strouhal l\u00e0 m\u1ed9t c\u00f4ng c\u1ee5 quan tr\u1ecdng trong vi\u1ec7c nghi\u00ean c\u1ee9u v\u00e0 hi\u1ec3u bi\u1ebft c\u00e1c hi\u1ec7n t\u01b0\u1ee3ng dao \u0111\u1ed9ng trong d\u00f2ng ch\u1ea3y c\u1ee7a ch\u1ea5t l\u1ecfng. N\u00f3 cung c\u1ea5p m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3 \u0111\u1ec3 d\u1ef1 \u0111o\u00e1n v\u00e0 ki\u1ec3m so\u00e1t c\u00e1c hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y, \u0111\u1ea3m b\u1ea3o an to\u00e0n v\u00e0 t\u1ed1i \u01b0u h\u00f3a trong nhi\u1ec1u \u1ee9ng d\u1ee5ng k\u1ef9 thu\u1eadt.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>T\u00ecm hi\u1ec3u v\u1ec1 s\u1ed1 Strouhal trong ch\u1ea5t l\u1ecfng, m\u1ed9t \u0111\u1ea1i l\u01b0\u1ee3ng quan tr\u1ecdng trong k\u1ef9 thu\u1eadt nhi\u1ec7t, gi\u00fap \u0111\u00e1nh gi\u00e1 c\u00e1c hi\u1ec7n t\u01b0\u1ee3ng dao \u0111\u1ed9ng v\u00e0 d\u00f2ng ch\u1ea3y c\u1ee7a ch\u1ea5t l\u1ecfng.<\/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 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>S\u1ed1 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