• thermal fatigue failure of fuel spray bars of a jet engine afterburner

    نویسندگان :
    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 601
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     afterburning or reheating is one the methods to periodically augment the basic thrust of the turbojet engines. it increases the thrust by adding fuel to the exhaust gases after they have passed through the turbine section. at this point there is still much uncombined oxygen in the exhaust. the resultant increase in the temperature raises the velocity of the exiting gases and therefore boosts engine thrust. most afterburners will produce an approximate 50% thrust increase, but with a corresponding threefold increase in fuel flow. since the specific and actual fuel consumption is considerably higher during the time the engine is in afterburning or ‘‘hot” operation, as compared to the non-afterburning or ‘‘cold” mode of operation, reheating is used only for the time-limited operation of takeoff, climb, and maximum bursts of speed. fig. 1 shows a simple afterburner schematic. it consists of the following components: (i) engine or turbine-driven afterburner fuel pump, (ii) afterburner fuel control, (iii) pressurizing valve—if multistage operation is possible, (iv) spray bars, (v) torch igniter and or ignition system, (vi) flame holders, (vii) variable-area exhaust nozzle, (viii) connections (mechanical and pressure) from main fuel control.

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