«Science History»
Zhukovsky, Nikolay

Nikolai Egorovich Zhukovsky

Born: 17 January 1847 in Orekhovo, Vladimir gubernia, Russia
Died: 17 March 1921 in Moscow, USSR

Nikolai Egorovich Zhukovskii (or Zhukovsky or Joukowski) was the son of Egor Zhukovskii who was a communications engineer. Nikolai Egorovich attended the Fourth Gymnasium for Men in Moscow, completing his secondary education there in 1864. He then entered the Faculty of Physics and Mathematics at Moscow University where he studied applied mathematics. He graduated in 1868 and from 1870 he taught at the Second Gymnasium for Women in Moscow.

After two years teaching at the Gymnasium, Zhukovskii received an invitation to teach mathematics at Moscow Technical School then, from 1874, he also taught theoretical mechanics there. While he was teaching these courses, Zhukovskii was also studying for his Master's Degree and in 1876 he was awarded this degree for a thesis on the kinematics of a liquid. It is worth pointing out that the Russian Master's Degree is essentially the equivalent of a British/American Ph.D. today while the Russian doctorate at this time was essentially the equivalent of the German Habilitation. After being awarded his Master's Degree, a special chair of mechanics was created for Zhukovskii at Moscow Technical School.

Zhukovskii obtained a doctorate from Moscow University in 1882 for a dissertation on the stability of motion. He worked at the university, becoming the Head of the Department of Mechanics in 1886. By this time he had begun to receive awards for his outstanding work, having been awarded the N D Brashman prize for theoretical work in fluid dynamics in 1885.

Over his career Zhukovskii had a remarkable publications record producing over 200 publications on mechanics. In 1886 he wrote a [13]:-

... memoir dealing with the motion of bodies filled with a homogeneous incompressible fluid. ... the advantages of Zhukovskii's geometrical and sound mechanical approach to the problem, [means that] his memoir still remains quite up to date.
Perhaps Zhukovskii is most famous, however, as the founder of the Russian schools of hydromechanics and aeromechanics. For his work in these areas he became known as the Father of Russian Aviation. Zhukovskii [1]:-
... became interested in the late 1880s in flight in heavier-than-air machines, a basic problem of which was lift.
During 1890-91 he experimented with disks placed in currents of air and, in 1891, he began to study the dynamics of flight. In 1895 he visited Lilienthal in Berlin. Lilienthal was selling gliders produced in his factory in Berlin. Zhukovskii [2]:-
... observed several of Lilienthal's flights and was most impressed. After returning to Moscow, he spoke before the Society of Friends of the Natural Sciences: "The most important invention of recent years in the area of aviation is the flying machine of the German engineer Otto Lilienthal.
Zhukovskii purchased one of the eight gliders which Lilienthal sold to members of the public. In 1906 Zhukovskii published two papers in which he gave a mathematical expression for the lift on an airfoil. Today it is known as the Kutta-Joukowski theorem, since Kutta pointed out that the equation also appears in his 1902 dissertation.

In 1911 Zhukovskii wrote:-

The field of hydrodynamic phenomena which can be explored with exact analysis is more and more increasing.
Zhukovskii was concerned both with theoretical and with experimental aspects of the subject. His theoretical work concentrated on lift, high-speed aerodynamics, vortex theory, longitudinal and cross stability but he complemented this work with appropriate experimental observations in every case. With this twin approach he became the Russian pioneer on both aspects of aviation. He went on to establish an aerodynamics laboratory and to teach courses on his theories of aerodynamics [1]:-
His lectures at the Moscow Technical School on the theoretical basis of aeronautics (1911-12) were the world's first systematic course in aviation theory and were based largely on his own theoretical research and on experiments conducted in laboratories that he had established.
In mathematics today the conformal mapping of the complex plane zz + 1/z is called the Joukowski transformation. This gave Zhukovskii [2]:-
... a means of designing aerofoils using conformal mappings and the techniques of complex variables. Those Joukowski aerofoils were actually used on some aircraft, and today these techniques provide a mathematically rigorous reference solution to which modern approaches to aerofoil design can be compared for validation.

During World War I Zhukovskii taught a special course for pilots and he was the first person in Russia to study the theory of bombing from aeroplanes in 1915.

In 1918 he organised the Central Aerohydrodynamic Institute and became its first head. The Institute was renamed the N E Zhukovskii Academy of Military and Aeronautical Engineering in 1922 following Zhukovskii's death.

Zhukovsky also worked on hydrodynamics and hydraulics, in particular shock waves in water pipes. In particular he solved problems concerning the bursting of pipes with his studies of hydraulic shock. Other problems he considered were the formation of river beds and the construction of dams, where again his expertise was invaluable in constructing power stations.

Zhukovskii's works were published in 25 volumes from 1935 to 1950.

Article by: J J O'Connor and E F Robertson

May 2000
MacTutor History of Mathematics
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