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首页> 外文期刊>Engineering failure analysis >Thermal fatigue failure of fuel spray bars of a jet engine afterburner
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Thermal fatigue failure of fuel spray bars of a jet engine afterburner

机译：喷气发动机后燃器燃油喷杆的热疲劳失效

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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 [ 1 ]. Fig. 1 shows a simple afterburner schematic [1]. 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.
机译：再燃或再热是定期增加涡轮喷气发动机基本推力的一种方法。在废气通过涡轮部分后，通过向废气中添加燃料来增加推力。此时，排气中仍有大量未结合的氧气。温度的最终升高会提高排出气体的速度，从而提高发动机推力。大多数加力燃烧器将产生大约50％的推力增加，但燃料流量相应增加三倍。由于与非加力或“冷”运行方式相比，在发动机处于加力或“热”运行期间的特定和实际燃料消耗要高得多，因此，再加热仅用于发动机的限时运行。起飞，爬升和最大速度爆发[1]。图1显示了一个简单的加力燃烧器示意图[1]。它由以下组件组成：（i）发动机或涡轮驱动的加力燃油泵，（ii）加力燃油控制，（iii）增压阀-如果可以多级操作，（iv）喷杆，（v）火炬点火器，以及或点火系统，（vi）火焰保持器，（vii）可变面积排气喷嘴，（viii）来自主要燃料控制装置的连接（机械和压力）。

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