超临界压力下航空煤油结焦换热综述及实验

Review and experimental study of the coke deposition and heat transfer characteristics of aviation kerosene at supercritical pressure

综述了航空发动机CCA(cooled cooling air)冷却方式,对利用航空发动机外涵空气和航空煤油作为冷源两种不同技术路线的技术效能进行了对比,结果表明后者具有明显的优势.对国内外超临界压力下航空煤油结焦机理、结焦影响因素、结焦抑制以及换热、流动特性研究现状进行了综述,结果表明煤油温度、压力、表面材料对结焦有影响作用,加入相应添加剂可以有效抑制结焦,流动不稳定的影响因素以及浮升力对换热影响的判据.针对国内燃油RP-3进行了超临界流动结焦、静态结焦、以及流动换热的初步实验研究,结果表明压力、进口温度、材料表面特性影响煤油热氧化结焦,质量流量、流动方向、实验段弯曲对煤油换热有所影响.

The aero-engine cooling method using CCA（cooled cooling air） was studied by comparison of two different technical routes using bypass flow and aviation kerosene.The result indicates that the latter method offers greater potential benefits for improving engine performance.According to the studies made at home and abroad,the results show that the fuel temperature,pressure and surface material have influence on fuel deposition.The relative addictives in the fuel could reduce the deposition effectively.The influential factors of flow instability and the criterion for buoyancy were also found.The initial experimental studies on coke deposition and heat transfer characteristics at supercritical pressure show that,the fuel pressure,inlet temperature and surface material affect the thermal deposition.And the mass flow rate,flow orientation and the bend of the tube have influence on the heat transfer characteristics.