塞式喷管气动特性与性能研究

对6单元瓦状塞式喷管、6单元圆转方内喷管塞式喷管和1单元直排塞式喷管进行了实验和数值模拟研究.实验表明,3个塞式喷管具有良好的高度补偿特性和较高的效率,6单元瓦状塞式喷管和1单元直排塞式喷管在设计高度的效率接近100%;由于内喷管型面不够理想和加工时存在的缺陷,6单元圆转方内喷管塞式喷管的设计点效率在95%左右.数值模拟结果与实验数据吻合较好,结合实验和数值模拟分析了外界反压对气流,进而对底部气动特性的影响.实验研究了底部二次流流量变化对性能的影响.

Studies on Aerodynamic Behavior and Performance of Aerospike Nozzles

Experimental and numerical studies are carried out on a 6-cell tile-shaped aerospike nozzle, a 6-cell aerospike nozzle with round-to-rectangle primary nozzles and a 1-cell linear aerospike nozzle. Good altitude compensation capacities and high efficiencies are obtained in the tests. The efficiencies of 6-cell tile-shaped aerospike nozzle and 1-cell linear aerospike nozzle at design altitude approach to 100 %, and that of 6-cell aerospike nozzle with round-to-rectangle primary nozzles in the same condition is about 95 % due to the imperfect cell contour and manufacturing defects. Numerical results are in good agreements with test data. The effects of ambient pressure on exhaust and then on base behavior are analyzed, The effects of variation in the amount of base bleed on performance are also examined in the tests.