刘 涛.涡扇发动机装机状态自然低温试验[J].航空发动机,2023,49(6):121-126
涡扇发动机装机状态自然低温试验
Natural Low-Temperature Test Research for the Installed Turbofan Engine
  
DOI:
中文关键词:  涡扇发动机  自然低温试验  装机状态  冷浸透  起动性能  加速时间
英文关键词:turbofan engine  natural low-temperature test  installed state  cold soak  starting performance  acceleration time
基金项目:航空动力基础研究项目资助
作者单位
刘 涛 中国飞行试验研究院西安 710089 
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中文摘要:
      为完成涡扇发动机状态鉴定,在北方场站开展了发动机装机状态下的自然环境低温试验。通过地面试验完成了自然低 温试验环境的量化分析,研究了不同气源起动模式、不同使用方法对装机状态自然低温条件下发动机起动性能的影响,分析了发 动机样本量对试验鉴定结果的影响。结果表明:APU供气是低温冷浸透起动的首选起动方式;冷运转可以有效改善发动机低温起 动性能,使相对起动时间缩短0.125~0.250;增加发动机样本量可以获得更加科学的鉴定结果,在低温起动过程中,发动机可能出 现失速等不稳定现象,甚至造成起动失败。开展了飞行试验,研究了空中低温环境对发动机工作参数及加减速特性的影响。结果 表明:在相同高度和速度下发动机加速时间随进气温度的降低而延长,当空中进气温度相差约30 ℃时,加速时间延长最多约为 18%;减速时间随进气温度的变化不大。
英文摘要:
      Low-temperature tests in the natural environment of the installed engine were conducted in the north air-force station as a part of T&E for the turbofan engine. Quantitative analysis of the natural low-temperature test environment was completed through ground tests, the effects of different air source starting modes and operational modes on the starting performance of the installed engine under natu? ral low-temperature conditions were studied, and the influence of engine sample size on the test assessment results was analyzed. The test results show that the APU air supply is the preferred starting method for low-temperature cold soak starting; Cold-running can effectively improve the cold soak starting performance of the engine and shorten the relative starting time by 0.125 ~ 0.250. More scientific assessment results can be obtained by increasing the sample size of the engine. During low-temperature starting, the engine may experience unstable phenomena such as stall, and even starting failure. Flight tests were conducted to investigate the impact of the in-flight low-temperature en? vironment on engine operating parameters and acceleration/deceleration characteristics. Flight test results indicate that the acceleration time increases with the decrease of inlet temperature at the same altitude and indicated airspeed. When the difference of inlet air tempera? ture is about 30 ℃, the acceleration time is extended by up to 18%; The deceleration time varies little with the inlet temperature.
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