作　　者： (王丁）; (吉洪湖）; (黄伟）;

机构地区： 南京航空航天大学能源与动力学院,南京210016

出　　处： 《工程热物理学报》 2017年第9期1944-1951,共8页

摘　　要： 基于某轴对称排气系统,建立了一种小中段偏径比(S_m/D)、出口偏径比(S_o/D)大于0的双S形二元排气系统模型。该双S形二元排气系统在除了上方探测面0°到20°的角度范围内,所研究的其余方位角均做到了喷管型面对排气系统内部涡轮等高温部件的遮挡。通过数值计算研究了双S形二元排气系统的推力和红外特性,并与基准轴对称排气系统进行了对比。结果表明:小中段偏径比和大长径比使双S形二元排气系统避免了推力损失,相比基准轴对称排气系统,该双S形二元排气系统的推力增加了0.2%;双S形二元排气系统的红外辐射强度在侧向探测面上最小,在上方探测面最大;相比基准轴对称排气系统,双S形二元排气系统在0°方位角降低了97%以上,在侧向、上方和下方探测面90°方向分别降低了62.1%、26.1%和34.9%。 Based on an axisymmetric exhaust system, a serpentine 2-D exhaust system with small middle offset-diameter ratio （Sm/D） and exit offset-diameter ratio （So8D） greater than zero was established. Excepting the range of 0° to 20° on the upper detection plane, the serpentine 2-D exhaust system could completely blocked the infrared （IR） radiation of internal components such as turbine and cone, etc. at other detection directions studied in this work. The thrust and IR characteristics of the serpentine 2-D exhaust system were studied numerically. The results show that, the serpentine 2-D exhaust system has little thrust loss because of small Sm/D and large L/D, and the thrust of the serpentine 2-D exhaust system increases 0.2% compared with the axisymmetric exhaust system; the integral IR radiation intensity of the serpentine 2-D exhaust system is the weakest on the side detection plane while the strongest on the upper detection plane; comparing with the axisymmetric exhaust system, the integral IR radiation intensity of the serpentine 2-D exhaust system reduces at least 97% at the angle on the direction right behind the exit of the nozzle, and reduces at least 62.1%, 26.1% and 34.9% on the direction vertical to the axis of the exit of the nozzle on the side, upper and lower detection planes respectively.

关 键 词： 排气系统 双 弯二元喷管 红外辐射 推力