Temat: IR device - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Heat balance of the military vehicle
Autorzy:: Brzeżański, M.
Mężyk, P.
Tematy:: heat balance
thermal energy storage
emission of heat
thermal image
IR device
bilans cieplny
magazynowanie energii cieplnej
emisja ciepła
obraz termowizyjny; Pokaż więcej
Wydawca:: Polskie Towarzystwo Naukowe Silników Spalinowych
Powiązania:: https://bibliotekanauki.pl/articles/133873.pdf Link otwiera się w nowym oknie
Opis:: In modern combat vehicles there are very often used observation devices with the capability of operating in the infrared. They allow detecting heat emission. It is very important to reduce such situation on the battlefield; therefore generated heat masking or reducing systems are used. The article presents the heat balance of the military vehicle, impact of heat amount on detectability and solutions reducing or changing the thermal image which impedes recognition.
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Study of inline-slot ejector diffuser under varying ambient conditions: A passive infrared suppression device for ships
Autorzy:: Singh, L.
Singh, S. N.
Sinha, S. S.
Tematy:: applications for navy
ejector diffuser
passive iInfrared suppression device
InfraRed (IR)
IR imaging
IR locking
Shear Stress Transport (SST)
Infrared Suppression System (IRSS); Pokaż więcej
Wydawca:: Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Powiązania:: https://bibliotekanauki.pl/articles/117455.pdf Link otwiera się w nowym oknie
Opis:: Passive infrared (IR) suppression device, commonly known as ejector diffuser, is an integral part of the defence system of a ship. The definitive role of passive IR suppressor to counter the IR tracking and locking of the ship has made them indispensable for any combat marine. The gas turbine exhaust gases are the leading heat source on a ship. The exhaust temperature of the gases ranges between 650K-850K. At such temperatures, the ship can be easily detected by the enemy through IR imaging. The role of the ejector diffuser is to (i) lower the gas turbine exhaust gases temperature to the limits (< 450K) such that the IR locking of the marine can be avoided, and (ii) recover static pressure such that the engine performance of the gas turbine is not affected. Ejector diffuser has the ability to entrain ambient air and allow mixing it with the exhaust gases thereby, lowering the temperature of the exhaust gases. However, the mixed exhaust gases temperature depends on the ambient air temperature which under extreme conditions can fluctuate from 273K to 323K. This temperature range can affect the temperature characteristics of an ejector diffuser. The present study undertakes the effect of ambient temperature on the performance of inline-slot ejector diffuser. The ambient temperature (T0) has been varied in the range 273K ≤ T0 ≤ 323K in the step of 10K. It has been found that the mass entrainment increases (≈ 8%) as the ambient temperature decreases. The core temperature at the exit decreases, from 457.58 K to 417.75K, with a decrease in the ambient temperature. However, no significant changes in static pressure recovery.
Dostawca treści:: Biblioteka Nauki

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