Ahmed El-Sayed on LinkedIn: TURBO-RAMJET ENGINES The Lockheed SR-71 "Blackbird" is a long-range… (2025)

Ahmed El-Sayed

Professor of Aerospace and Mechanical Power Engineering, Zagazig University

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TURBO-RAMJET ENGINESThe Lockheed SR-71"Blackbird" is a long-range, high-altitude,Mach3+strategicreconnaissance aircraftdeveloped and manufactured by the American aerospace companyLockheed Corporation. It is powered by two Pratt & Whitney J58(turbo-ramjet engines)with 25,000 lbf (110 kN) thrust each. The J-58 engine is of the WRAPAROUND Turbo-ramjet type. At subsonic speed, it operates as a turbojet engine, while at high supersonic speeds, it operates as a ramjet engine, and at low supersonic speed, it combines both turbojet and ramjet operations. The different cases are illustrated on the T-S diagram. A detailed analysis of this engine, as well as the second type of turbo-ramjet (Over/under type), is given in my book (Aircraft Propulsion and Gas Turbine Engines, 2nd edition, Taylor & Francis/CRC Press, 2017).The third edition will be available soon.

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