Temat: separation edge - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Niestandardowe badania identyfikacyjne broni
Customized weapons identification tests
Autorzy:: Bogiel, Grzegorz
Powiązania:: https://bibliotekanauki.pl/articles/2057450.pdf
Data publikacji:: 2020
Wydawca:: Centralne Laboratorium Kryminalistyczne Policji
Tematy:: identyfikacja indywidualna broni
łuska
komora nabojowa
dubeltówka
krawędź rozdzielenia
individual weapons identification
cartridge shell
cartridge chamber
shotgun
separation edge
Opis:: Artykuł porusza temat indywidualnych badań identyfikacyjnych broni. Mogą być one wykonane także w razie braku możliwości wykonania strzałów w celu pozyskania materiału porównawczego. W artykule opisany jest taki przypadek, dotyczący rozerwania komory nabojowej dubeltówki w trakcie strzału.
The article raises the issue of individual weapons identification tests which can be performed, including when it is not possible to fire shots in order to obtain comparative material. The article describes one of such cases, involving bursting of the cartridge chamber of a shotgun during the shooting.
Źródło:: Problemy Kryminalistyki; 2020, 308; 12-14
0552-2153
Pojawia się w:: Problemy Kryminalistyki
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Study on the behavior of streamwise vortices formed between leading edge tubercles in a compressor cascade
Autorzy:: Zheng, Tan
Qiang, Xiao-Qing
Teng, Jin-Fang
Feng, Jin-Zhang
Powiązania:: https://bibliotekanauki.pl/articles/281149.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: compressor cascade
flow separation
leading edge tubercles
streamwise vortices
formation mechanism
Opis:: A study has been carried out to investigate the formation mechanism and development of streamwise vortices induced by leading edge tubercles in a high speed compressor cascade. The preliminary assessment of the cascade performance in terms of the total pressure loss coefficient shows that the loss reduction is achieved at high incidence angles. A smaller wavelength leads to higher additional losses at the design point, but gives rise to a greater loss reduction at high incidence angles. The modified cascade with a tubercle wavelength of 4% chord achieves the maximum loss reduction of 36.1% at i = 10◦ , as well as the stall angle improvement of 27.6%. The formation mechanism of streamwise vortices is elaborated on the basis of the streamwise vorticity equation, in which the streamwise turning terms may be responsible for the generation of streamwise vortices. Slices of streamwise vorticity at various streamwise locations, combined with vorticity strength distributions, have been presented to study the development of streamwise vortices. The counter-rotating vortices are divided into the crest-induced streamwise vortices (CSVs) and trough-induced streamwise vortices (TSVs). A streamwise vortex pair formed from a part of the CSV sheets behind troughs, is gradually entrained by the TSV pair along the streamwise direction. In addition, the tubercles with a smaller wavelength result in higher streamwise vorticity strength with which the streamwise vortices interact with the flow separation more sufficiently and delay the separation to a greater extent.
Źródło:: Journal of Theoretical and Applied Mechanics; 2019, 57, 3; 617-629
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Numerical loss analysis in a compressor cascade with leading edge tubercles
Autorzy:: Zheng, T.
Qiang, X.-Q.
Teng, J.-F.
Teng, J.-Z.
Powiązania:: https://bibliotekanauki.pl/articles/280966.pdf
Data publikacji:: 2018
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: compressor cascade
flow separation
passive flow control
leading edge tubercles
streamwise vortices
loss analysis
Opis:: A numerical analysis of loss has been carried out to explore the loss mechanism of leading edge tubercles in a high speed compressor cascade. Taking the lead from flippers of the humpback whale, tubercles are passive structures of a blade for flow control. Evaluation of the overall performance in terms of entropy increase shows that the loss reduction is achieved both at high negative and high positive incidence angles, while a rise in the loss is obtained near the design point. And a smaller wave number as well as a smaller amplitude results in lower additional losses at the design point. Spanwise and streamwise distributions of pitchwise-averaged entropy increase combined with flow details have been presented to survey the loss development and, subsequently, to interpret the loss mechanism. The tubercle geometry results in the deflection flow and the consequent spanwise pressure gradient. This pressure gradient induces formation of counter-rotating streamwise vortices, transports away the low-momentum fluid near wall from crests towards troughs and leads to local high loss regions behind troughs as well as loss reduction behind the crests in comparison to the baseline. The interaction between these vortices and flow separation by momentum transfer leads to separation delay and the consequent loss reduction at the outlet.
Źródło:: Journal of Theoretical and Applied Mechanics; 2018, 56, 4; 1083-1095
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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