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Jakob Ackeret

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Parent: Ludwig Prandtl Hop 4
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Jakob Ackeret
Jakob Ackeret
source
NameJakob Ackeret
CaptionSwiss engineer and aerodynamics pioneer
Birth date17 March 1898
Birth placeZürich, Switzerland
Death date26 March 1981
Death placeZürich, Switzerland
NationalitySwiss
FieldsAerodynamics, Fluid dynamics
WorkplacesETH Zurich, Aerodynamic Research Institute Göttingen
Alma materETH Zurich
Doctoral advisorAurel Stodola
Known forAckeret theory, Mach number, Gas turbines
AwardsDaniel Guggenheim Medal, Ludwig-Prandtl-Ring

Jakob Ackeret was a pioneering Swiss engineer and professor whose fundamental work in aerodynamics and fluid dynamics shaped the development of high-speed flight and turbomachinery in the 20th century. He is best known for his theoretical contributions to compressible flow, notably the Ackeret theory for supersonic airfoils, and for popularizing the use of the Mach number in honor of his mentor, Ernst Mach. His career was centered at the ETH Zurich, where he educated generations of engineers and conducted influential research for industry and government.

Biography

Born in Zürich, he studied mechanical engineering at the ETH Zurich under the renowned professor Aurel Stodola. After completing his doctorate, he worked from 1925 to 1927 at the prestigious Aerodynamic Research Institute Göttingen in Germany under the direction of Ludwig Prandtl, a foundational figure in modern fluid dynamics. He returned to Switzerland in 1928 to become a professor at his alma mater, ETH Zurich, where he established a leading school of aerodynamics and directed the Institute of Aerodynamics for decades, influencing major projects like the Swiss Federal Railways and the Swiss Air Force.

Scientific contributions

His most celebrated theoretical achievement is the linearized theory for the lift and drag of airfoils in supersonic flow, universally known as Ackeret theory, which became a cornerstone for the design of early supersonic aircraft. He played a crucial role in the advancement of gas turbine and jet engine technology, conducting seminal research on compressor and turbine blade design that benefited companies like BBC Brown Boveri and the Allied war effort during World War II. Furthermore, he made significant contributions to the understanding of cavitation in hydraulic machinery, such as water turbines and pumps, and conducted early experiments with shock tubes for studying high-speed phenomena.

Aerodynamic research

His research at the ETH Zurich wind tunnel facilities extensively investigated the performance of propellers and airfoils at high subsonic speeds, providing critical data for the burgeoning aviation industry. He conducted pioneering studies on wind turbine aerodynamics and the effects of ground effect on aircraft during takeoff and landing, which informed the design of transport aircraft. His work on boundary layer control and flow separation had direct applications in improving the efficiency of various aerodynamic bodies and industrial components.

Professional affiliations and honors

He was a long-standing member of the Swiss Academy of Engineering Sciences and served as president of the International Council of the Aeronautical Sciences. His expertise was sought by organizations like the International Union of Theoretical and Applied Mechanics and the Advisory Group for Aerospace Research and Development of NATO. His numerous accolades include the prestigious Daniel Guggenheim Medal in 1965, awarded jointly by the AIAA, the SAE, and the ASME, and the Ludwig-Prandtl-Ring from the German Society for Aeronautics and Astronautics.

Legacy and recognition

The fundamental parameter for supersonic flow, the Ackeret number, is named in his honor, cementing his legacy in the annals of aerospace engineering. His teachings and textbooks influenced countless engineers across Europe and North America, shaping the post-war development of the aerospace industry. The research institute at ETH Zurich he led continues to be a major center for fluid dynamics research, and his theoretical frameworks remain essential in the design of modern supersonic and hypersonic vehicles.

Category:Swiss aerospace engineers Category:Fluid dynamicists Category:ETH Zurich alumni Category:ETH Zurich faculty