翻译Investigation of a Solid Fuel Scramjet Combustor.doc

The combustion of a solid fuel under supersonic crossflow conditions in a scramjet configuration has been studied experimentally. Self-ignition and sustained combustion of polymethylmethacrylate with no external aid (such as reactive gas injection or a pilot flame) were demonstrated in static tests simulating a flight Mach number of about 5 at high altitude. The appropriate inlet conditions, i.e., stagnation temperature and pressure in excess of 1200 K and 16 atm, respectively, were provided by a vitiated air heater. The diverging combustion chamber included a fore-end flame stabilization zone, whose flameholding limits were determined experimentally. Flow and combustion phenomena were studied both by pressure measurements along the fuel grain and by video recording, taking advantage of the fuel transparency. Comparison between theoretical results of a one-dimensional flow model with test data showed fair agreement, indicating the existence of a supersonic flow regime within the combustor. The video pictures provided temporal and spatial fuel regression rate data, using a computerized image analysis system. 超音速横向气流条件下的燃烧固体燃料超燃冲压发动机配置的实验研究。自燃和持续燃烧的有机玻璃,没有外部援助(如活性气体注入或引燃火焰)在静态测试模拟飞行马赫数5在高海拔。适当的入口条件,即。,临界温度和压力超过1200 K和16个atm,分别提供的空气加热器。不同燃烧室包括火焰稳定区域,其火焰稳定极限测定实验。流量和燃烧现象进行了研究通过压力测量沿燃料颗粒通过录像,利用燃料的透明度。对比一维流模型的理论结果与测试数据显示公平的协议,表明超音速燃烧室中的流态的存在。视频照片提供了时间和空间的燃料回归率数据,用计算机图像分析系统。the?selection?of an appropriate air-breathing engine type is greatly ?affected by?the design flight speed.?Regarding the?energetic performance, the ramjet engine is superior to the?turbojet engine for flight Mach numbers greater than 3.?Nevertheless, the stagnation pressure losses associated with the?deceleration of the airflow from supersonic to subsonic increase with increasing flight Mach number and may substantially reduce the operating cycle efficiency (reflected by the specific?impulse).?Thus, for hypersonic flights (starting at?Mach 5 – 7), a supersonic combustion ramjet (scramjet) or its?derivati