论文部分内容阅读
为了适应超燃冲压发动机模块化设计及圆形燃烧室的需求,隔离段必须设计成矩形截面渐变为圆形出口的形状。发展了一种基于超椭圆曲线的截面渐变方法,以此设计了矩形转圆隔离段,开展了数值模拟研究并进行了在Ma=2.1且来流条件非对称下的矩形转圆隔离段吹风实验。研究结果表明:在反压相同时,两种不同来流条件下矩形转圆隔离段的出口总压恢复系数较等直矩形隔离段分别提高了4%和5%;在非对称来流实验条件下,矩形转圆隔离段壁面沿程压力分布规律与等直矩形隔离段压力分布规律趋势一致,上壁面沿程压力曲线前部呈波动式上升,后半部上升平缓,而下壁面沿程压力曲线整体上升较为平缓,随着出口反压的增大,总压恢复系数随之减小,矩形转圆隔离段最大能够承受4.1倍的来流静压,极限反压状态下出口总压恢复系数为0.505。
In order to meet the modular design of scramjet and the requirement of a round chamber, the isolation section must be designed in the shape of a rectangular cross-section tapered into a circular outlet. A method based on hyperelliptic curve was developed to design the rectangular round isolation section. The numerical simulation was carried out and the blowing experiment was carried out on rectangular round isolated section under the condition of Ma = 2.1 and asymptotic condition of incoming flow . The results show that at the same backpressure, the outlet pressure recovery coefficient of rectangular round isolation section increases by 4% and 5% respectively compared with the straight rectangular isolation section under the two different incoming flow conditions. Under asymmetric flow conditions , The pressure distribution along the wall of the rectangular round and round isolation section is consistent with the pressure distribution law of the isolating section under the straight rectangular section. The front of the pressure curve along the upper wall shows a fluctuating rise, the latter half rises gently, while the pressure along the lower wall As the outlet pressure increases, the total pressure recovery coefficient decreases, and the rectangular rotary isolation section can withstand 4.1 times the maximum hydrostatic pressure. The total pressure recovery coefficient Is 0.505.