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New approach to injection of pressurizing gas into fuel tanks of power units

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Authors:


I.Kravchenko, orcid.org/0000-0003-2304-3356, Zaporizhzhia Machine-Building Design Bureau Progress State Enterprise named after Academician O.H.Ivchenko, Zaporizhzhia, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Yu.Mitikov, orcid.org/0000-0002-4787-603X, Oles Honchar Dnipro National University, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Yu.Torba, orcid.org/0000-0001-8470-9049, Zaporizhzhia Machine-Building Design Bureau Progress State Enterprise named after Academician O.H.Ivchenko, Zaporizhzhia, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

O.Zhyrkov, orcid.org/0000-0003-4003-6078, Zaporizhzhia Machine-Building Design Bureau Progress State Enterprise named after Academician O.H.Ivchenko, Zaporizhzhia, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.


повний текст / full article



Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2021, (6): 090 - 095

https://doi.org/10.33271/nvngu/2021-6/090



Abstract:



Purpose.
Determination a rational way to injection of high-temperature pressurizing gas into fuel tanks of large elongation. Determination of longitudinal overload effect on the Archimedes force during the gas jet penetration in the tank. Reducing the need for pressurizing gas, the mass of the storage system.


Methodology.
A retrospective design analysis of devices for injecting the gas into tanks and taxonomy basics are used. With their help, it is possible to determine the causes of a wide variety of device designs for injecting gas into tanks and the common fundamental disadvantages of all known devices.


Findings.
As a result of the research carried out, a new method for supplying hot gas to the tanks has been found and substantiated. It is suitable for most conditions and provides a reduction in the need for pressurizing gas, does not reduce the operating fuel reserves, shows the trends for further research.


Originality.
The main reason for the differences between the results of ground tests and flight tests in terms of the gas parameters in the tank and the temperature of its upper bottom has been determined. This is overload effect on the increase in the buoyancy force on hot pressurizing gas jet, which is injected traditionally from the upper tank bottom to the side of the lower tank bottom. In this case, the buoyancy force acts against the dynamic component, reduces the jet range and presses the hot gas to the upper bottom. A new method for injecting the hot pressurizing gas, devoid of the indicated drawback, has been proposed and developed by using a theory of similarity. This makes it possible to mix the gas in the free volume of the tank as much as possible due to the action of the Archimedes force, to equalize gas temperature, reducing the maximum temperature at the upper bottom, and noticeable mass transfer processes in the tank are excluded.


Practical value.
The application of the proposed method permits defining correctly and accurately the gas flow rate for tank pressurization, using it with a temperature of up to ~1800 K. The drop in gas pressure disappears in the tank at the initial moment of operation of the pressurization system, caused by the injection of a hot gas jet into the fuel surface. Depending on the conditions, the pressurizing gas requirement can be reduced by up to 50%. In this case, the main fuel reserves in the tank are not reduced.



Keywords:
propulsive unit, fuel tanks, high-temperature gas, inlet section, upper tank bottom

References.


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ISSN (print) 2071-2227,
ISSN (online) 2223-2362.
Journal was registered by Ministry of Justice of Ukraine.
Registration number КВ No.17742-6592PR dated April 27, 2011.

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