{"id":4767,"date":"2012-02-24T00:55:57","date_gmt":"2012-02-24T00:55:57","guid":{"rendered":"http:\/\/www.autolexicon.net\/?p=4767"},"modified":"2016-03-24T08:26:25","modified_gmt":"2016-03-24T08:26:25","slug":"oktanove-cislo","status":"publish","type":"post","link":"https:\/\/www.autolexicon.net\/cs\/articles\/oktanove-cislo\/","title":{"rendered":"Oktanov\u00e9 \u010d\u00edslo"},"content":{"rendered":"<p><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-family: verdana,geneva; font-size: small;\">Oktanov\u00e9 \u010d\u00edslo (O\u010c) paliva vyjad\u0159uje objemov\u00fd pod\u00edl dvou l\u00e1tek: <strong>izooktanu<\/strong> (odpov\u00edd\u00e1 oktanov\u00e9mu \u010d\u00edslu 100) a <strong>n-heptanu<\/strong> (\u010dist\u00fd n-heptan m\u00e1 definic\u00ed ur\u010deno oktanov\u00e9 \u010d\u00edslo 0). Prim\u00e1rn\u00ed benz\u00edny z\u00edskan\u00e9 destilac\u00ed ropy maj\u00ed vzhledem k\u00a0po\u017eadavk\u016fm dne\u0161n\u00edch motor\u016f nedostate\u010dn\u00e9 oktanov\u00e9 \u010d\u00edslo, proto je ho t\u0159eba zv\u00fd\u0161it. <strong>Sou\u010dasn\u00e9 motory vy\u017eaduj\u00ed O\u010c minim\u00e1ln\u011b 90, <\/strong>i kdy\u017e\u00a0nap\u0159. USA je b\u011b\u017en\u011b k dost\u00e1n\u00ed\u00a0tzv. \u201eREGULAR\u201c s\u00a0O\u010c 87. Nejd\u016fle\u017eit\u011bj\u0161\u00ed metodou ke zv\u00fd\u0161en\u00ed oktanov\u00e9ho \u010d\u00edsla benz\u00ednu je izomerace lehk\u00fdch benz\u00edn\u016f a reformov\u00e1n\u00ed t\u011b\u017ek\u00fdch benz\u00edn\u016f. Oktanov\u00e9 \u010d\u00edslo upraven\u00e9ho benz\u00ednu m\u016f\u017ee m\u00edt i vy\u0161\u0161\u00ed hodnotu ne\u017e 100, co\u017e vyjad\u0159uje fakt, \u017ee dan\u00e9 palivo je je\u0161t\u011b odoln\u011bj\u0161\u00ed proti samoz\u00e1palu ne\u017e \u010dist\u00fd izooktan.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-family: verdana,geneva; font-size: small;\">Od dvac\u00e1t\u00fdch let dvac\u00e1t\u00e9ho stolet\u00ed se zvy\u0161ovalo oktanov\u00e9 \u010d\u00edslo pomoc\u00ed olovnat\u00fdch aditiv. Jeliko\u017e je ale olovo jedovat\u00e1 l\u00e1tka, kter\u00e1 se nesp\u00e1l\u00ed, a nav\u00edc po\u0161kozuje <a href=\"http:\/\/www.autolexicon.net\/articles\/katalyzator\/\">katalyz\u00e1tor<\/a>, postupn\u011b se od olovnat\u00e9ho benz\u00ednu ustupovalo. V roce 1995 ji\u017e tvo\u0159ila olovnat\u00e1 paliva pouh\u00fdch 0,6\u00a0% celkov\u00e9ho prodeje benzinu a od 1. ledna 1996 byl <strong>prodej olova pro pou\u017eit\u00ed v silni\u010dn\u00edch vozidlech zak\u00e1z\u00e1n \u00fapln\u011b<\/strong>. V\u00a0sou\u010dasn\u00e9 dob\u011b se tedy vyr\u00e1b\u00ed benz\u00edny bezolovnat\u00e9, jejich\u017e oktanov\u00e9 \u010d\u00edslo je zvy\u0161ov\u00e1no p\u0159\u00edm\u011bs\u00ed uhlovod\u00edk\u016f \u00e9terick\u00e9ho p\u016fvodu.<\/span><\/p>\n<p style=\"text-align: center;\" align=\"center\"><span style=\"font-family: verdana,geneva; font-size: small;\">\u00a0<a href=\"http:\/\/www.autolexicon.net\/obr_clanky\/cs_oktanove_cislo_001.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-4776\" title=\"oktanov\u00e9 \u010d\u00edslo benz\u00edn\u016f je uvedeno na stojanu\" src=\"http:\/\/www.autolexicon.net\/obr_clanky\/cs_oktanove_cislo_001.jpg\" alt=\"\" width=\"478\" height=\"322\" srcset=\"https:\/\/www.autolexicon.net\/obr_clanky\/cs_oktanove_cislo_001.jpg 478w, https:\/\/www.autolexicon.net\/obr_clanky\/cs_oktanove_cislo_001-250x168.jpg 250w\" sizes=\"auto, (max-width: 478px) 100vw, 478px\" \/><\/a><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-family: verdana,geneva; font-size: small;\">Velikost oktanov\u00e9ho \u010d\u00edsla \u0159idi\u010d zjist\u00ed u\u017e p\u0159i tankov\u00e1n\u00ed nap\u0159. ze stojanu nebo na <a href=\"http:\/\/www.autolexicon.net\/articles\/vydejni-pistole-u-cerpaci-stanice\/\">v\u00fddejn\u00ed pistoli<\/a>. Nap\u0159\u00edklad palivo Natural 91, kter\u00e9 m\u00e1 oktanov\u00e9 \u010d\u00edslo 91. Znamen\u00e1 to, \u017ee palivo je stejn\u011b odoln\u00e9 proti samoz\u00e1palu jako sm\u011bs, skl\u00e1daj\u00edc\u00ed se z 91\u00a0% oktanu a 9\u00a0% heptanu.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-family: verdana,geneva; font-size: small;\"><strong>Detona\u010dn\u00ed spalov\u00e1n\u00ed<br \/>\n<\/strong><\/span><span style=\"font-family: verdana,geneva; font-size: small;\">Antidetona\u010dn\u00ed vlastnosti automobilov\u00fdch benz\u00edn\u016f jsou charakterizov\u00e1ny oktanov\u00fdm \u010d\u00edslem, kter\u00e9 vyjad\u0159uje odolnost benz\u00ednu proti <strong>detona\u010dn\u00edmu spalov\u00e1n\u00ed<\/strong>. Detona\u010dn\u00ed spalov\u00e1n\u00ed vznik\u00e1 p\u0159i m\u00edstn\u00edm vzplanut\u00ed \u010d\u00e1sti sm\u011bsi paliva se vzduchem, kter\u00e9 m\u00e1 charakter detonace. Tzn., \u017ee se tlakov\u00e1 vlna, vyvolan\u00e1 detona\u010dn\u00edm spalov\u00e1n\u00edm, \u0161\u00ed\u0159\u00ed spalovac\u00edm prostorem nadzvukovou rychlost\u00ed a p\u0159i dopadu na st\u011bny spalovac\u00edho prostoru vyvol\u00e1 r\u00e1zy v\u00a0klikov\u00e9m mechanismu. Detona\u010dn\u00ed spalov\u00e1n\u00ed se projevuje tzv. \u201eklep\u00e1n\u00edm motoru\u201c.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-family: verdana,geneva; font-size: small;\">P\u0159\u00edpadn\u00fd vznik detona\u010dn\u00edho spalov\u00e1n\u00ed je ovlivn\u011bn p\u0159edev\u0161\u00edm <a href=\"http:\/\/www.autolexicon.net\/articles\/kompresni-pomer\/\">kompresn\u00edm pom\u011brem<\/a>, tvarem spalovac\u00edho prostoru, p\u0159edstihem z\u00e1\u017eehu a samoz\u0159ejm\u011b zmi\u0148ovan\u00fdm oktanov\u00fdm \u010d\u00edslem benz\u00ednu. Rychlost \u0161\u00ed\u0159en\u00ed plamene p\u0159i norm\u00e1ln\u00edm ho\u0159en\u00ed je 20 \u2013 40 m\/s a rychlost \u0161\u00ed\u0159en\u00ed tlaku je 1000 m\/s. P\u0159i detona\u010dn\u00edm spalov\u00e1n\u00ed se plamen \u0161\u00ed\u0159\u00ed m\u00edstn\u00ed \u0159et\u011bzovou reakc\u00ed a \u0161\u00ed\u0159en\u00ed tlakov\u00e9 vlny dosahuje rychlosti a\u017e 3000 m\/s.<\/span><\/p>\n<p style=\"text-align: center;\"><a href=\"http:\/\/www.autolexicon.net\/obr_clanky\/cs_oktanove_cislo_002.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-medium wp-image-4777\" title=\"detona\u010dn\u00ed spalov\u00e1n\u00ed\" src=\"http:\/\/www.autolexicon.net\/obr_clanky\/cs_oktanove_cislo_002-500x310.jpg\" alt=\"\" width=\"500\" height=\"310\" srcset=\"https:\/\/www.autolexicon.net\/obr_clanky\/cs_oktanove_cislo_002-500x310.jpg 500w, https:\/\/www.autolexicon.net\/obr_clanky\/cs_oktanove_cislo_002-250x155.jpg 250w, https:\/\/www.autolexicon.net\/obr_clanky\/cs_oktanove_cislo_002.jpg 759w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-family: verdana,geneva; font-size: small;\"><strong>Stanoven\u00ed velikosti oktanov\u00e9ho \u010d\u00edsla<br \/>\n<\/strong><\/span><span style=\"font-family: verdana,geneva; font-size: small;\">Hodnoty oktanov\u00e9ho \u010d\u00edsla paliva se z\u00edskaj\u00ed m\u011b\u0159en\u00edm na zku\u0161ebn\u00edm jednov\u00e1lcov\u00e9m motoru s prom\u011bnn\u00fdm kompresn\u00edm pom\u011brem, tedy podobnou cestou jako u stanovov\u00e1n\u00ed <a href=\"http:\/\/www.autolexicon.net\/articles\/cetanove-cislo\">cetanov\u00e9ho \u010d\u00edsla<\/a> motorov\u00e9 nafty. Existuj\u00ed dv\u011b metody stanoven\u00ed velikosti oktanov\u00e9ho \u010d\u00edsla:<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li><span style=\"font-family: verdana,geneva; font-size: small;\"><strong><em>stanoven\u00ed oktanov\u00e9ho \u010d\u00edsla motorovou metodou &#8211; \u010cSN 65 6197 <\/em><\/strong><\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"font-family: verdana,geneva; font-size: small;\">je ur\u010dov\u00e1no p\u0159i 900\u00a0ot\u00e1\u010dk\u00e1ch za minutu. Popisuje sp\u00ed\u0161e chov\u00e1n\u00ed p\u0159i provozu ve vy\u0161\u0161\u00edch rychlostech, nap\u0159. na d\u00e1lnici. Oktanov\u00e9 \u010d\u00edslo motorovou metodou je typicky o cca 10 bod\u016f ni\u017e\u0161\u00ed!!!<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li><span style=\"font-family: verdana,geneva; font-size: small;\"><strong><em>stanoven\u00ed oktanov\u00e9ho \u010d\u00edsla v\u00fdzkumnou metodou &#8211; \u010cSN 65 6161<\/em><\/strong><\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"font-family: verdana,geneva; font-size: small;\">je ur\u010dov\u00e1no p\u0159i 600\u00a0ot\u00e1\u010dk\u00e1ch za minutu. Je vhodn\u00e9 pro popis m\u011bstsk\u00e9ho provozu p\u0159i n\u00edzk\u00fdch rychlostech a s \u010dastou akcelerac\u00ed. V praxi se t\u00e9m\u011b\u0159 v\u0161ude uv\u00e1d\u00ed pouze oktanov\u00e9 \u010d\u00edslo z\u00edskan\u00e9 touto metodou, oktanov\u00e9 \u010d\u00edslo motorovou metodou je v\u0161ak definov\u00e1no v norm\u00e1ch.<\/span><span style=\"font-family: verdana,geneva; font-size: small;\">\u00a0<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-family: verdana,geneva; font-size: small;\"><strong>Princip stanoven\u00ed<br \/>\n<\/strong><\/span><span style=\"font-family: verdana,geneva; font-size: small;\">Jednov\u00e1lcov\u00fd zku\u0161ebn\u00ed motor umo\u017e\u0148uje postupnou zm\u011bnu kompresn\u00edho pom\u011bru. U motoru b\u011b\u017e\u00edc\u00edm na zkou\u0161en\u00e9 palivo je zvy\u0161ov\u00e1n kompresn\u00ed pom\u011br, dokud nenastane detona\u010dn\u00ed spalov\u00e1n\u00ed. Na motoru je ponech\u00e1n nastaven\u00fd kompresn\u00ed pom\u011br. V\u00a0druh\u00e9m kroku je motor spu\u0161t\u011bn na sm\u011bs isooktanu a n-heptanu. Pom\u011br sm\u011bsi se plynule m\u011bn\u00ed, dokud op\u011bt nenastane p\u0159i dan\u00e9m kompresn\u00edm pom\u011bru detona\u010dn\u00ed spalov\u00e1n\u00ed. Zn\u00e1m\u00fd pom\u011br isooktanu a n-heptanu, kter\u00fd je pr\u00e1v\u011b spalov\u00e1n ur\u010d\u00ed oktanov\u00e9 \u010d\u00edslo.<\/span><\/p>\n<p><span style=\"font-family: verdana,geneva; font-size: small;\"><strong>Text:<\/strong> Jan Sajdl<br \/>\n<\/span><span style=\"font-family: verdana,geneva; font-size: small;\"><strong>Foto: <\/strong>www.lcbamarketing.com, www.roper.cz,<br \/>\n<\/span><span style=\"font-family: verdana,geneva; font-size: small;\"><strong>Kl\u00ed\u010dov\u00e1 slova: <\/strong>palivo, oktanov\u00e9 \u010d\u00edslo, octan rating, octan number, benzin, benz\u00edn, kvalita paliva, z\u00e1\u017eehov\u00fd motor<\/span><\/p>","protected":false},"excerpt":{"rendered":"<p>Oktanov\u00e9 \u010d\u00edslo ud\u00e1v\u00e1 kvalitu benz\u00ednu a je sou\u010d\u00e1st\u00ed ozna\u010den\u00ed v\u011bt\u0161iny paliv. \u010c\u00edm vy\u0161\u0161\u00ed m\u00e1 benz\u00edn oktanov\u00e9 \u010d\u00edslo, t\u00edm vy\u0161\u0161\u00ed je jeho odolnost proti samoz\u00e1palu p\u0159i kompresi ve v\u00e1lci.<\/p>\n","protected":false},"author":1,"featured_media":4776,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","rop_custom_images_group":[],"rop_custom_messages_group":[],"rop_publish_now":"initial","rop_publish_now_accounts":{"facebook_10217573569066608_119527941460186":"","twitter_308591058_308591058":""},"rop_publish_now_history":[],"rop_publish_now_status":"pending","ngg_post_thumbnail":0,"two_page_speed":[],"footnotes":""},"categories":[1,86,4],"tags":[358,1185,1188,1187,1186,201,355],"class_list":["post-4767","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-nezarazene","category-palivo-a-provozni-naplne","category-casti-automobilu","tag-benzin","tag-kvalita-paliva","tag-octan-number","tag-octan-rating","tag-oktanove-cislo","tag-palivo","tag-zazehovy-motor"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Oktanov\u00e9 \u010d\u00edslo - autolexicon.net<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.autolexicon.net\/cs\/articles\/oktanove-cislo\/\" \/>\n<meta property=\"og:locale\" content=\"cs_CZ\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Oktanov\u00e9 \u010d\u00edslo - autolexicon.net\" \/>\n<meta property=\"og:description\" content=\"Oktanov\u00e9 \u010d\u00edslo ud\u00e1v\u00e1 kvalitu benz\u00ednu a je sou\u010d\u00e1st\u00ed ozna\u010den\u00ed v\u011bt\u0161iny paliv. \u010c\u00edm vy\u0161\u0161\u00ed m\u00e1 benz\u00edn oktanov\u00e9 \u010d\u00edslo, t\u00edm vy\u0161\u0161\u00ed je jeho odolnost proti samoz\u00e1palu p\u0159i kompresi ve v\u00e1lci.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.autolexicon.net\/cs\/articles\/oktanove-cislo\/\" \/>\n<meta property=\"og:site_name\" content=\"autolexicon.net\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/autolexicon.net\" \/>\n<meta property=\"article:published_time\" content=\"2012-02-24T00:55:57+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2016-03-24T08:26:25+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.autolexicon.net\/obr_clanky\/cs_oktanove_cislo_001.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"478\" \/>\n\t<meta property=\"og:image:height\" content=\"322\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Ing. 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