{"id":18916177,"date":"2026-09-01T14:47:23","date_gmt":"2026-09-01T12:47:23","guid":{"rendered":"https:\/\/migflug.com\/afterburner\/how-does-a-jet-engine-work\/"},"modified":"2026-09-01T14:48:51","modified_gmt":"2026-09-01T12:48:51","slug":"how-does-a-jet-engine-work","status":"publish","type":"post","link":"https:\/\/migflug.com\/afterburner\/it\/how-does-a-jet-engine-work\/","title":{"rendered":"How Does a Jet Engine Work?"},"content":{"rendered":"\r\n<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\r\n\r\n<p>Stand behind a jet at full power and the experience is less like hearing a machine than being shoved by one. A modern airliner engine can produce more than 100,000 pounds of thrust from a device with essentially no reciprocating parts &mdash; just a shaft, some blades, and fire. And underneath the engineering, the idea is almost embarrassingly simple.<\/p>\r\n<p>A jet engine grabs a great deal of air, throws it backwards very hard, and gets pushed forwards in return. Everything else is detail. Here is how that detail works.<\/p>\r\n\r\n<div style=\"background:#f5f5f5;padding:20px 24px;margin:24px 0;border-left:4px solid #5C91FF\"><p style=\"margin:0 0 10px;font-weight:700;font-size:17px;color:#1a1a1a\">Quick Facts<\/p><table style=\"width:100%;border-collapse:collapse;font-size:15px\"><tr><td style=\"padding:6px 12px 6px 0;font-weight:600;color:#333;vertical-align:top;white-space:nowrap\">Cycle<\/td><td style=\"padding:6px 0;color:#444\">The Brayton cycle: intake, compression, combustion, expansion<\/td><\/tr><tr><td style=\"padding:6px 12px 6px 0;font-weight:600;color:#333;vertical-align:top;white-space:nowrap\">Shorthand<\/td><td style=\"padding:6px 0;color:#444\">\"Suck, squeeze, bang, blow\"<\/td><\/tr><tr><td style=\"padding:6px 12px 6px 0;font-weight:600;color:#333;vertical-align:top;white-space:nowrap\">Core parts<\/td><td style=\"padding:6px 0;color:#444\">Fan, compressor, combustor, turbine, nozzle<\/td><\/tr><tr><td style=\"padding:6px 12px 6px 0;font-weight:600;color:#333;vertical-align:top;white-space:nowrap\">Key principle<\/td><td style=\"padding:6px 0;color:#444\">Newton\u2019s third law: throw mass backwards, get pushed forwards<\/td><\/tr><tr><td style=\"padding:6px 12px 6px 0;font-weight:600;color:#333;vertical-align:top;white-space:nowrap\">Turbine inlet temp<\/td><td style=\"padding:6px 0;color:#444\">Hotter than the melting point of the blades themselves<\/td><\/tr><tr><td style=\"padding:6px 12px 6px 0;font-weight:600;color:#333;vertical-align:top;white-space:nowrap\">Bypass ratio<\/td><td style=\"padding:6px 0;color:#444\">~5:1 on older CFM56s to over 12:1 on the GE9X<\/td><\/tr><tr><td style=\"padding:6px 12px 6px 0;font-weight:600;color:#333;vertical-align:top;white-space:nowrap\">First run<\/td><td style=\"padding:6px 0;color:#444\">Frank Whittle\u2019s Power Jets WU, 12 April 1937<\/td><\/tr><tr><td style=\"padding:6px 12px 6px 0;font-weight:600;color:#333;vertical-align:top;white-space:nowrap\">Why turbofans win<\/td><td style=\"padding:6px 0;color:#444\">Moving a lot of air slowly beats moving a little air fast<\/td><\/tr><\/table><\/div>\r\n\r\n<h2 style=\"padding-top:22px\">Suck, squeeze, bang, blow<\/h2>\r\n<p>Generations of engineers have learned the gas turbine through four words.<\/p>\r\n\r\n<div style=\"background:#f8f9fa;border-left:4px solid #5C91FF;padding:20px 22px;margin:18px 0 24px;font-size:16px;line-height:1.7;display:flex;gap:20px;align-items:flex-start\"><div><em>&ldquo;The jet engine works on the principle of suck, squeeze, bang, blow.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Rolls-Royce<\/strong> &mdash; on the fundamentals of the gas turbine<\/div><\/div><\/div>\r\n\r\n<p><strong>Suck.<\/strong> Air enters the intake, funnelled in by the fan at the front. <strong>Squeeze.<\/strong> That air passes through the compressor &mdash; rank after rank of spinning blades, each stage raising the pressure, until the air is many times denser than the atmosphere outside. <strong>Bang.<\/strong> In the combustor, fuel is sprayed into that high-pressure air and burned continuously. <strong>Blow.<\/strong> The hot, expanding gas rushes rearward through the turbine and out of the nozzle.<\/p>\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img data-opt-id=501157740  fetchpriority=\"high\" decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/ml5psubhxdln.i.optimole.com\/cb:0e0_.b970\/w:auto\/h:auto\/q:mauto\/ig:avif\/https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/09\/turbofan-engine-cutaway-compressor-turbine.jpg\" alt=\"Cutaway of a turbofan engine showing compressor, combustor and turbine\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">Cut one open and the logic is visible: air is squeezed through stage after stage of blades, burned, then expanded through turbines on its way out. Photo: Wikimedia Commons.<\/figcaption><\/figure>\r\n\r\n<p>The clever part is that the turbine sits in that exhaust stream and is spun by it &mdash; and the turbine is connected by a shaft to the compressor and fan at the front. The engine therefore powers its own air supply. Once it is running, it keeps itself running.<\/p>\r\n\r\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/KjiUUJdPGX0\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n\r\n<h2 style=\"padding-top:22px\">The thermodynamics, briefly<\/h2>\r\n<p>Formally, this is the Brayton cycle: compress a gas, add heat at roughly constant pressure, then expand it to extract work. The engine converts chemical energy in kerosene into a fast-moving column of gas. What escapes the nozzle carries far more momentum than the still air that entered the intake, and by Newton&rsquo;s third law that difference is thrust.<\/p>\r\n<p>Which points at a question with a counter-intuitive answer: is it better to throw a small amount of air very fast, or a lot of air moderately fast?<\/p>\r\n<h2 style=\"padding-top:22px\">Why modern engines are mostly fan<\/h2>\r\n<p>Early jets were turbojets: every scrap of air went through the burning core and out the back at enormous velocity. Effective, thirsty, and deafening. Then engineers realised it is far more efficient to accelerate a large mass of air a little than a small mass of air a lot.<\/p>\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img data-opt-id=1938003014  fetchpriority=\"high\" decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/ml5psubhxdln.i.optimole.com\/cb:0e0_.b970\/w:auto\/h:auto\/q:mauto\/ig:avif\/https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/09\/boeing-787-trent-1000-engine-nacelle.jpg\" alt=\"A Rolls-Royce Trent 1000 engine on a Boeing 787\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">A modern high-bypass turbofan. Most of the air you see entering that fan never touches the burning core at all. Photo: Wikimedia Commons.<\/figcaption><\/figure>\r\n\r\n<p>Hence the turbofan. A huge fan at the front pushes most of its air <em>around<\/em> the core rather than through it. That bypass air never burns; it simply gets shoved rearward, producing the majority of the thrust on a modern airliner engine. The ratio between bypass and core flow &mdash; the bypass ratio &mdash; runs from about 5:1 on older CFM56s to more than 12:1 on the newest GE9X. Higher bypass means better fuel burn and far less noise, which is why airliner engines have grown into the enormous barrels you see today, while fighters keep slim, low-bypass engines built for speed.<\/p>\r\n\r\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/xkZnOtyrzdQ\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n\r\n<h2 style=\"padding-top:22px\">Hotter than the metal it is made of<\/h2>\r\n<p>Here is the detail that surprises people most: the gas entering the turbine is hotter than the melting point of the turbine blades. Efficiency rises with turbine temperature, so engineers push past what the metal can survive and then cheat. Blades are grown as single crystals with no grain boundaries to fail along, coated in ceramic thermal barriers, and riddled with tiny holes that bleed cool compressor air over their surfaces as a protective film. The blade never quite touches the hottest gas.<\/p>\r\n<p>Each of those blades, incidentally, is extracting power comparable to a Formula 1 car &mdash; while glowing, spinning at tens of thousands of rpm, and holding on against centrifugal loads measured in tonnes.<\/p>\r\n<h2 style=\"padding-top:22px\">The man who started it<\/h2>\r\n<p>The whole architecture traces back to two people who worked it out independently: Hans von Ohain in Germany and Frank Whittle in Britain. Whittle first ran his Power Jets WU on 12 April 1937, and the experience was not soothing.<\/p>\r\n\r\n<div style=\"background:#f8f9fa;border-left:4px solid #1565c0;padding:20px 22px;margin:18px 0 24px;font-size:16px;line-height:1.7;display:flex;gap:20px;align-items:flex-start\"><div><em>&ldquo;I opened the control valve which admitted fuel. For a second or two, the speed increased slowly. Then, with a rising shriek like an air-raid siren, the speed began to rise rapidly and large patches of red heat became visible on the combustion chamber casing.&rdquo;<\/em><div style=\"margin-top:10px;font-size:14px;color:#555\"><strong>Sir Frank Whittle<\/strong> &mdash; describing the first run of his turbojet, 12 April 1937<\/div><\/div><\/div>\r\n\r\n\r\n<figure class=\"wp-block-image size-large\" style=\"margin:0 0 24px;width:100%\"><img data-opt-id=1245299878  decoding=\"async\" class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" width=\"1024\" src=\"https:\/\/ml5psubhxdln.i.optimole.com\/cb:0e0_.b970\/w:auto\/h:auto\/q:mauto\/ig:avif\/https:\/\/migflug.com\/afterburner\/wp-content\/uploads\/sites\/4\/2026\/09\/whittle-w2-700-jet-engine.jpg\" alt=\"A Power Jets W2-700, from Frank Whittle\u2019s turbojet family\" style=\"width:100%;height:auto;max-width:100%;display:block\"><figcaption style=\"font-size:13px;color:#777;text-align:center;margin-top:6px;font-style:italic\">A Power Jets W2-700. Whittle\u2019s first engine ran in 1937 and terrified everyone present. Photo: Wikimedia Commons.<\/figcaption><\/figure>\r\n\r\n<p>Britain&rsquo;s first jet, the Gloster E.28\/39, flew on 15 May 1941. Within a decade the piston fighter was obsolete; within three, the jet had shrunk the world. Every turbofan hanging under a wing today is a direct descendant of that shrieking, red-hot machine in a workshop in 1937.<\/p>\r\n\r\n<div style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin:24px 0\"><iframe class=\"skip-lazy\" data-no-lazy=\"1\" loading=\"eager\" src=\"https:\/\/www.youtube.com\/embed\/OgwvH9yk7XQ\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0\" allowfullscreen><\/iframe><\/div>\r\n\r\n<p><em>Sources: Rolls-Royce; NASA Glenn Research Center; GE Aerospace; Imperial War Museums; Popular Science.<\/em><\/p>\r\n\r\n<section style=\"margin:34px 0 8px\"><h2 style=\"padding-top:22px\">Frequently Asked Questions<\/h2><details open style=\"border-top:1px solid #e2e7ee;padding:12px 0\"><summary style=\"font:600 18px\/1.45 Montserrat,system-ui,sans-serif;color:#1a1a1a;cursor:pointer\">How does a jet engine work in simple terms?<\/summary><div style=\"font-size:16px;line-height:1.7;color:#333;margin-top:8px\">A jet engine sucks in air, squeezes it to high pressure with a compressor, sprays in fuel and burns it, then lets the hot gas expand out through a turbine and nozzle. Throwing that mass backwards pushes the aircraft forwards, following Newton\u2019s third law.<\/div><\/details><details style=\"border-top:1px solid #e2e7ee;padding:12px 0\"><summary style=\"font:600 18px\/1.45 Montserrat,system-ui,sans-serif;color:#1a1a1a;cursor:pointer\">What does \"suck, squeeze, bang, blow\" mean?<\/summary><div style=\"font-size:16px;line-height:1.7;color:#333;margin-top:8px\">It is the standard shorthand for the four stages of a gas turbine. Suck is the intake drawing in air, squeeze is the compressor raising its pressure, bang is fuel burning in the combustor, and blow is the hot gas expanding out through the turbine and nozzle.<\/div><\/details><details style=\"border-top:1px solid #e2e7ee;padding:12px 0\"><summary style=\"font:600 18px\/1.45 Montserrat,system-ui,sans-serif;color:#1a1a1a;cursor:pointer\">What is the Brayton cycle?<\/summary><div style=\"font-size:16px;line-height:1.7;color:#333;margin-top:8px\">The Brayton cycle is the thermodynamic cycle a gas turbine actually follows: air is compressed, heat is added at roughly constant pressure by burning fuel, and the hot gas then expands to produce work. \"Suck, squeeze, bang, blow\" is the plain-English version of it.<\/div><\/details><details style=\"border-top:1px solid #e2e7ee;padding:12px 0\"><summary style=\"font:600 18px\/1.45 Montserrat,system-ui,sans-serif;color:#1a1a1a;cursor:pointer\">What is the difference between a turbojet and a turbofan?<\/summary><div style=\"font-size:16px;line-height:1.7;color:#333;margin-top:8px\">A turbojet pushes all of its air through the burning core. A turbofan adds a large fan at the front, and most of that air bypasses the core entirely. The turbofan moves far more air slightly slower, which is quieter and much more fuel efficient.<\/div><\/details><details style=\"border-top:1px solid #e2e7ee;padding:12px 0\"><summary style=\"font:600 18px\/1.45 Montserrat,system-ui,sans-serif;color:#1a1a1a;cursor:pointer\">What is bypass ratio?<\/summary><div style=\"font-size:16px;line-height:1.7;color:#333;margin-top:8px\">Bypass ratio is the mass of air flowing around the engine core divided by the mass flowing through it. A 10:1 ratio means ten kilograms bypass the core for every kilogram that goes through it. Modern engines range from about 5:1 to over 12:1.<\/div><\/details><details style=\"border-top:1px solid #e2e7ee;padding:12px 0\"><summary style=\"font:600 18px\/1.45 Montserrat,system-ui,sans-serif;color:#1a1a1a;cursor:pointer\">Why do jet engines run hotter than their blades can survive?<\/summary><div style=\"font-size:16px;line-height:1.7;color:#333;margin-top:8px\">Because efficiency rises with turbine inlet temperature, engineers push gas temperatures above the melting point of the turbine blades. The blades survive through single-crystal alloys, ceramic thermal-barrier coatings and a film of cooling air bled from the compressor.<\/div><\/details><details style=\"border-top:1px solid #e2e7ee;padding:12px 0\"><summary style=\"font:600 18px\/1.45 Montserrat,system-ui,sans-serif;color:#1a1a1a;cursor:pointer\">Who invented the jet engine?<\/summary><div style=\"font-size:16px;line-height:1.7;color:#333;margin-top:8px\">Sir Frank Whittle in Britain and Hans von Ohain in Germany developed turbojets independently. Whittle first ran his Power Jets WU engine on 12 April 1937, and Britain\u2019s first jet aircraft, the Gloster E.28\/39, flew on 15 May 1941.<\/div><\/details><details style=\"border-top:1px solid #e2e7ee;padding:12px 0\"><summary style=\"font:600 18px\/1.45 Montserrat,system-ui,sans-serif;color:#1a1a1a;cursor:pointer\">Can I fly in a jet-powered aircraft myself?<\/summary><div style=\"font-size:16px;line-height:1.7;color:#333;margin-top:8px\">Yes. You do not need to join an air force to feel a turbojet at full power. MiGFlug offers flights in genuine military jets such as the L-39 Albatros and the MiG-29, with details at https:\/\/migflug.com\/flights-prices\/.<\/div><\/details><\/section>\r\n\r\n\r\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"How does a jet engine work in simple terms?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A jet engine sucks in air, squeezes it to high pressure with a compressor, sprays in fuel and burns it, then lets the hot gas expand out through a turbine and nozzle. Throwing that mass backwards pushes the aircraft forwards, following Newton\u2019s third law.\"}},{\"@type\":\"Question\",\"name\":\"What does \\\"suck, squeeze, bang, blow\\\" mean?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It is the standard shorthand for the four stages of a gas turbine. 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MiGFlug offers flights in genuine military jets such as the L-39 Albatros and the MiG-29, with details at https:\/\/migflug.com\/flights-prices\/.\"}}]}<\/script><div style=\"background:#f0f4ff;border-left:4px solid #5C91FF;padding:16px 20px;margin:32px 0 8px\"><p style=\"margin:0 0 8px;font-weight:600;color:#333\">Related Posts<\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/jet-engine-compressor-stall-explained\/\">Why a Jet Engine Coughs: The Compressor Stall<\/a><\/p><p style=\"margin:4px 0\"><a href=\"https:\/\/migflug.com\/afterburner\/thrust-vectoring-explained-fighter-jets\/\">Thrust Vectoring: Pointing the Engine to Win the Fight<\/a><\/p><\/div>\r\n","protected":false},"excerpt":{"rendered":"<p>Suck, squeeze, bang, blow \u2014 how a jet engine turns kerosene into thrust, why modern engines are mostly fan, and how the turbine survives gas hotter than its own melting point.<\/p>","protected":false},"author":27,"featured_media":18915778,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"editor_notices":[],"footnotes":""},"categories":[665,664],"tags":[],"class_list":["post-18916177","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aviation-world","category-military-aviation"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How Does a Jet Engine Work? 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