Temperature probes of different designs were widely used in aero gas turbine engines for measurement of air and gas temperatures at various locations starting from inlet of fan to exhaust gas from the nozzle. Exhaust Gas Temperature (EGT) downstream of low pressure turbine is one of the key parameters in performance evaluation and digital engine control. The paper presents a holistic approach towards life assessment of a high temperature probe housing thermocouple sensors designed to measure EGT in an aero gas turbine engine. Stress and vibration analysis were carried out from mechanical integrity point of view and the same was evaluated in rig and on the engine. Application of 500 g load concept to clear the probe design was evolved. The design showed strength margin of more than 20% in terms of stress and vibratory loads. Coffin Manson criteria, Larsen Miller Parameter (LMP) were used to assess the Low Cycle Fatigue (LCF) and creep life while Goodman criteria was used to assess High Cycle Fatigue (HCF) margin. LCF and HCF are fatigue related damage from high frequency vibrations of engine components and from ground-air-ground engine cycles (zero-max-zero) respectively and both are of critical importance for ensuring structural integrity of engine components. The life estimation showed LCF life of more than 4000 mission reference cycles, infinite HCF life and well above 2000 h of creep life. This work had become an integral part of the health monitoring, performance evaluation as well as control system of the aero gas turbine engine.

中文翻译：

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高温探针的寿命评估，该探针设计用于航空涡轮发动机的性能评估和健康监测

不同设计的温度探头已广泛用于航空涡轮发动机中，用于测量从风扇的入口到喷嘴的排气开始的各个位置的空气和气体温度。低压涡轮下游的废气温度（EGT）是性能评估和数字发动机控制中的关键参数之一。本文提出了一种用于评估高温探头的热电偶传感器寿命的整体方法，该探头设计用于测量航空燃气涡轮发动机的EGT。从机械完整性的角度进行了应力和振动分析，并在钻机和发动机上进行了评估。演变了应用500 g载荷概念来清除探针设计的情况。该设计在应力和振动载荷方面显示出超过20％的强度余量。棺材曼森标准，拉森·米勒参数（LMP）用于评估低周疲劳（LCF）和蠕变寿命，而古德曼标准用于评估高周疲劳（HCF）裕度。LCF和HCF分别是由于发动机部件的高频振动和地面-地面-地面发动机循环（零-最大-零）引起的疲劳相关损坏，两者对于确保发动机部件的结构完整性至关重要。寿命估算显示，LCF寿命超过4000个任务参考周期，HCF寿命无限，蠕变寿命也远高于2000 h。这项工作已成为健康监测，性能评估以及航空燃气涡轮发动机控制系统的组成部分。