Registration Number
0221U100516,
0118U003442
, R & D reports
Title
Investigation of applied issues of application of supercavitating, jet and unseparated flows for high-speed underwater motion
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Head
Savchenko Yurii M., Доктор технічних наук
Registration Date
06-01-2021
Organization
Institute of Hydromechanics of NAS of Ukraine
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A series of studies on the disk entry into the water at small angles of
inclination of the trajectory to the free surface was continued. The
experimental setup was modernized, stroboscopic illumination on LEDs with a
frequency of up to 1000 frames per second was completed and recording
equipment was improved. Work was carried out to modernize the pool to
increase the depth to 500 mm and length to 2000 mm, as well as catapults to
expand the range of angles of entry of the model into the water. The test
results are presented and analyzed.
Experimental studies of the previously proposed body of revolution V
with a very short zone of pressure increase were conducted. The use of a wind
tunnel at the Technical University of Braunschweig (Germany) has reduced the
influence of flow boundaries and increased the Reynolds number. Measurement
of static pressure and visualization of the flow using the oil flow on the
surface of the model showed the presence of separation on a smooth body. It
was partially eliminated due to the use of thin obstacle rings. The obtained
experimental pressure distributions deviate significantly from the
theoretical one.
A completely nonlinear solution of the problem of a heavy liquid
flow around a submerged body with a free surface is presented in the form of
analytical expressions for the complex potential, complex velocity and
reflection function. These functions explicitly contain the magnitude of the
velocity on the free surface and the direction of velocity on the surface of
the body as a function of a variable parameter. They are determined from a
system of integral equations and solved numerically using the developed
iterative method. For the weightless flow, the coefficient of lift decreases
as the cylinder approaches the free surface. The shape of the free surface
significantly depends on the circulation, and at a certain value on the depth of immersion.
Product Description
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Ivanyuk Volodymyr F.
Vlasenko Yurij D.
Kashirikhin Leonid P.
Kyselyov Taras P.
Kozenko Oleg M.
Manova Zinaida I.
Naumova Olena I.
Nesteruk Ihor G
Savchenko Georgii Yu.
Savchenko Yurii M.
Semenenko Volodymyr M.
Semenov Yurii A.
Chychyk Petro D.
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2021-03-17
