scholarly journals Intensification of mixing of fuel with supersonic air flow when injection and electric discharge are combined

2021 ◽  
Vol 2100 (1) ◽  
pp. 012007
Author(s):  
A A Firsov ◽  
A V Efimov ◽  
N S Kolosov ◽  
I A Moralev ◽  
S B Leonov
Keyword(s):  
Electric Discharge ◽  
Wide Frequency Range ◽  
Gas Jet ◽  
Experimental Investigations ◽  
Oncoming Flow ◽  
Frequency Range ◽  
Pressure Pulsations ◽  
Dc Discharge ◽  
Discharge Operation ◽  
Mixing Intensification

Abstract This paper presents the results of experimental investigations of DC discharge influence on mixing intensification of transvers injected gas jet into supersonic aiflow. The air was used as injected gas to prevent the influence of chemical reactions on measurements. The data obtained during discharge includes current and voltage acquisition, registration of pressure pulsations in the jet downstream of discharge operation accompanied by correlation and Fourier analysis allowed to conclude that discharge significantly increase the pressure pulsations in a wide frequency range of 1000 Hz to 50kHz. Increase of the oscillations near the jet boundary is assumed to be related to kinematic mixing intensification of the injected gas with the oncoming flow.

scholarly journals Experimental investigations of acoustic field in sea shelf zone

2020 ◽  
Vol 196 ◽  
pp. 02011
Author(s):  
Vasiliy Chernenko ◽  
Chen Ven’tszyan’ ◽  
Viktor Petrosyants ◽  
Ivan Garasev ◽  
Vladimir Grishchenko
Keyword(s):  
Information Transfer ◽  
Acoustic Pressure ◽  
Wide Frequency Range ◽  
Shelf Zone ◽  
Experimental Investigations ◽  
Experimental Facility ◽  
Acoustic System ◽  
Frequency Range ◽  
Shallow Sea ◽  
Remote Communication

Developed experimental facility allows one to generate acoustic pressure within the intervals from 105 to 106 Pa with an affective system of matching layers of bottom, water and ice. Theoretical and experimental investigations showed the possibility of information transfer in a shallow sea under an ice layer. Experimental acoustic system allows one to make measurements in a wide frequency range from 40 to 1100 Hz. The conducted investigation can be used to develop effective remote communication and to model earthquake acoustic precursor measurements.

Installation for testing electronic voltmeters over a wide frequency range

1976 ◽  
Vol 19 (10) ◽  
pp. 1525-1526
Author(s):  
A. M. Fedorov ◽  
V. V. Krestovskii ◽  
V. S. Kiselev ◽  
S. A. Razumovskii ◽  
V. A. Shcheglov
Keyword(s):  
Wide Frequency Range ◽  
Frequency Range

Analysis of Dielectric Spectra of Water with Conductive Impurities in a Wide Frequency Range

2018 ◽  
Vol 60 (11) ◽  
pp. 1893-1900 ◽  
Author(s):  
V. A. Zhuravlev ◽  
V. I. Suslyaev ◽  
A. V. Zhuravlev ◽  
E. Yu. Korovin
Keyword(s):  
Wide Frequency Range ◽  
Frequency Range ◽  
Dielectric Spectra

Methods for improving the accuracy of frequency shift estimation in 5G NR

2021 ◽  
Author(s):  
Vladimir Sergeevich Milyutin ◽  
Eugeniy Vasilevich Rogozhnikov ◽  
Kirill Petrovskiy ◽  
Dmitriy Pokamestov ◽  
Edgar Dmitriyev ◽  
...  
Keyword(s):  
Frequency Shift ◽  
High Frequency ◽  
Communication Systems ◽  
Wide Frequency Range ◽  
Wireless Communication Systems ◽  
Frequency Synchronization ◽  
Frequency Range ◽  
Transmission Rates ◽  
Synchronization Accuracy ◽  
High Order Modulation

Abstract Frequency synchronization is a necessary operation for all wireless communication systems. Due to the wide frequency range defined for 5G NR systems, this procedure becomes critical. To ensure high transmission rates and the use of high-order modulation, up to 256 QAM for 5G communication systems, it is necessary to ensure high frequency synchronization accuracy. In this article, we have reviewed various approaches to implementing frequency synchronization and proposed, in our opinion, the most effective method for correcting the frequency shift of the signal.

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