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为研究高温升燃烧室喷油杆热防护问题,建立高温升燃烧室喷油杆热防护试验系统,设计加工三个不同尺寸隔热屏,探讨了进气温度、进气速度、供油压力、喷油杆布置方式和隔热屏方案等气动和结构参数影响喷油杆壁面温度、换热特性及油道出口燃油温度的变化规律。研究表明:当进气温度为903K,进气速度为36m/s,压力为0.22MPa时,不安装隔热屏的喷油杆出口燃油温度达到的最高温度为435K,随着供油压力增大,燃油出口温度逐渐降低,但最低温度也超过375K。三种方案隔热屏均能够起到对喷油杆的热防护,能够降低喷油杆壁面温度和油道出口燃油温度,考虑热防护效果和结构重量等综合因素,方案二隔热屏效果最佳,燃油出口最高温度不超过388K。
In order to study the hot protection of the fuel injection rod in the high temperature rise combustion chamber, a thermal protection test system of the fuel injection rod in the high temperature rise combustion chamber was established. Three different size heat shields were designed and processed. The effects of intake air temperature, intake air velocity, The aerodynamic and structural parameters, such as the layout of the fuel injection rod and the scheme of the heat shield, affect the variation of wall temperature, heat transfer characteristics and fuel temperature at the fuel outlet. The results show that when the inlet air temperature is 903K, the inlet air speed is 36m / s and the pressure is 0.22MPa, the highest temperature reached by the fuel temperature at the outlet of the fuel rod without heat shield is 435K. With the increase of the oil supply pressure , The fuel outlet temperature gradually decreased, but the minimum temperature also exceeded 375K. Three schemes heat shield can play the protection of the fuel injection rod heat, can reduce the fuel injection nozzle wall temperature and oil outlet fuel temperature, taking into account the thermal protection effect and structural weight and other comprehensive factors, the second scheme heat shield effect Good, the maximum temperature of the fuel export does not exceed 388K.