|Born||March 17, 1898
|Died||March 27, 1981
|Alma mater||ETH Zurich|
Birth and education
Jakob Ackeret was born in 1898 in Switzerland. He received his Diploma degree in Mechanical Engineering from ETH Zurich in 1920 under the supervision of Aurel Stodola. From 1921 to 1927 he worked with Ludwig Prandtl at the "Aerodynamische Versuchsanstalt" in Göttingen, witnessing a legendary period in the development of modern fluid dynamics. He received his PhD from ETH Zurich in 1927.
After completing his PhD, Ackeret worked at Escher Wyss AG in Zurich as Chief Engineer of Hydraulics, where he applied, with great success, modern aerodynamics to the design of turbines.
Ackeret was an expert on gas turbines and was known for his research on propellors and on high-speed propulsion problems.
When he was at ETH Zurich, he actively participated in the solution of practical engineering problems, such as the design of variable pitch propellers for ships and airplanes. His most important invention was the gas turbine with a closed circuit. He made the invention together with C. Keller.
Ackeret also contributed significantly to research in supersonic aerodynamics. He led the initial work on calculating the lift and drag on a supersonic airfoil and he proposed the designation of the "Mach number" for multiples of the speed of sound.  On a conference in Rome in 1935 Ackeret presented a design for a supersonic wind tunnel.
In 1976, he was elected foreign associate member of the American National Academy of Engineering for his "contributions to the understanding of high-speed and supersonic fluid mechanics, leading to significant improvements to the science of flight".
- Ackeret, J. (1925). Luftkräfte auf Flügel, die mit größerer als Schallgeschwindigkeit bewegt werden. Zeitschrift für Flugtechnik und Motorluftschiffahrt (16), 72-74.
- "Aeronautical research in Germany: from Lilienthal until today", Volume 147 by Ernst-Heinrich Hirschel, Horst Prem, Gero Madelung
- Jakob Ackeret
- Jakob Ackeret and the "Institut für Aerodynamik (IfA)
- Jakob Ackeret at the Mathematics Genealogy Project