CAJ | 학술논문

通过数值模拟研究了3种不同喷管内型面发动机的尾焰特性,将计算结果与某试验液氧/煤油发动机进行比较,分析喷管内型面对尾焰速度场、温度场和湍动能分布的影响.结果表明,采用数值仿真方法可以有效模拟出发动机尾焰的马赫盘和连续激波等基本结构、特性;相比于钟形喷管,锥形喷管和内型面为直线的喷管由于喷管扩张段内燃气存在非轴向流动,造成大量能量损失的同时引起了斜激波的产生,导致喷管出口膨胀更加剧烈、尾焰中连续激波更加明显.
통과수치모의연구료3충불동분관내형면발동궤적미염특성,장계산결과여모시험액양/매유발동궤진행비교,분석분관내형면대미염속도장、온도장화단동능분포적영향.결과표명,채용수치방진방법가이유효모의출발동궤미염적마혁반화련속격파등기본결구、특성;상비우종형분관,추형분관화내형면위직선적분관유우분관확장단내연기존재비축향류동,조성대량능량손실적동시인기료사격파적산생,도치분관출구팽창경가극렬、미염중련속격파경가명현.
Numerical simulations were carried out to analyze plume characteristics of three engines of different inner nozzle surface,the calculated results were compared to a test LO2/kerosene engine, the impact of inner nozzle surface on chamber pressure and velocity field, temperature field, turbulent kinetic energy distribution of plume were analyzed. The results show that the basic structure and characteristic of the engine plume such as Mach disk and continuous shock can be simulated effectively. Compared to the bell nozzle, because of the presence of non-axial movement of gas in nozzle expansion section, the conical nozzle and the linear nozzle made the oblique shock wave generation as time as there was a lot of energy loss. As a result, the expansion out of nozzle was more intense and the continuous shock in plume was more obvious.