How can i calculate the speed of a fan in a commercial jet engine?
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Open In AppSign In Jet EnginesAirplanesEngines What RPM do the revolving parts of commercial and military jet engines operate at? Still have a question? Ask your own! What is your question? Ad by Sefda.com The countries with the most billionaires in the world. Is your country in the list? Learn More 2 ANSWERS Arman Siani Arman Siani, Engineer, Entrepreneur, Traveler Answered Jan 28 · Author has 2.4k answers and 6.5m answer views Around 5000–30,000, depending on size, but that’s not really an important number. The fastest rotating part in a jet engine would be the compressor fans (the giant fans at the front of a jet engine). The RPM needed for the purpose would be whatever RPM would give the compressor fan blade a linear speed which is more than the speed of sound, and this linear speed is required to compress the incoming air. As a rough estimation: RPM (needed) = > (speed of sound)/(radius of compressor). So, the smaller your engine diameter, the higher would be your RPM, roughly speaking. But this RPM doesn’t determine the speed of the engine or the thrust output, and hence, isn’t important as an independent characteristic.