外涵引气双层壁喷油杆冷却特性数值模拟

Numerical simulation on cooling characteristics of an afterburner fuel injector with double-wall construction

通过数值模拟对新型加力用外涵引气双层壁喷油杆冷却性能进行了研究.该喷油杆为双层壁结构,从外涵引气冷却喷油杆.首先对实验油杆冷却性能进行了计算,并与油杆冷却性能模拟实验结果进行了对比,两者变化规律基本符合,表明该计算方法可用.随后用该方法对真实加力室油杆冷却性能进行了计算,得到该喷油杆在真实加力室4个工况下外套及油杆内壁温度分布及从外涵引气量.数值模拟结果表明该双层壁喷油杆方案可以有效引气和降温,使得喷油杆在高温的加力燃烧室内能正常工作.

The performance of the cooling air flow extracted from the bypass duct to cool a new fuel injector with double-wall construction for afterburner was simulated numerically.The results of the simulation and the experiment agree with each other very well.The temperature distribution of outer casing and inner pipe,and cooling air rate extracted from the bypass duct were obtained by calculations under four working conditions of the afterburner.It shows that the type of afterburner fuel injector can extract enoug...