单边膨胀喷管试验和数值模拟

谭杰; 金捷; 杜刚; 徐惊雷

单边膨胀喷管试验和数值模拟

1.
北京航空航天大学能源与动力工程学院, 航空发动机数值仿真研究中心,北京 100191
2.
南京航空航天大学能源与动力学院,南京 210016

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- 被引次数: 0
出版历程
- 收稿日期: 2010-05-24
- 修回日期: 2010-07-20
- 刊出日期: 2011-06-28

Experimental and computational investigation of single-expansion-ramp-nozzle

1.
Aeroengine Numerical Simulation Research Center,School of Jet Propulsion, Beijing University of Aeronautics and Astronautics,Beijing 100191,China
2.
College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China

摘要

摘要: 在落压比为4~60范围内,对两种不同膨胀型面的高速二元单边膨胀喷管模型试验件(SERN 1和SERN 2)进行了试验研究,获得了壁面静压分布和纹影照片.用三维数值计算得到了喷管性能参数,丰富了流场信息.试验和数值模拟结果表明:下腹板出口气流处于深度过膨胀状态时,喷管内部激波/边界层相互干扰并存在4~5道斜激波,而且SERN 1和SERN 2内部分别出现了自由激波分离和受限激波分离,这使得上膨胀面压力分布和喷管总体性能差别较大.两个模型在设计点附近总体性能差别较小,在设计点轴向推力系数可达0.96,推力矢量角约为9°;在低落比范围内,喷管性能变化较大而且两者差别明显;总体上来说,SERN 2性能优于SERN 1.
- 单边膨胀喷管 /
- 激波/边界层干扰 /
- 壁面静压分布 /
- 数值模拟 /
- 高超声速飞行器
Abstract: An experimental study was conducted for two high-speed two-dimensional(2-D) single-expansion-ramp-nozzles with different ramp contours at nozzle pressure ratios R_np between 4 and 60 under wind off condition.The wall static pressure distributions and schlieren flow visualization were obtained.A computational investigation was also conducted to determine the performance of the nozzle and enrich the details of flowfield.Results from this study indicate that under highly overexpanded conditions of cowl trailing edge,the inner nozzle flow is dominated by shock-induced boundary-layer separation and accompanied by four to five oblique shocks.Moreover,the free shock and restricted shock separation are identified respectively in SERN 1 and SERN 2,which exert large influence on the wall pressure distributions and overall performance of nozzles.The performance of two models has little difference in the vicinity of design point,the axial thrust coefficient reaches 0.96 and thrust vector angle is about 9 degrees at the design point.Through the low R_np regime,the performance of nozzles show large variation and the difference is obvious between SERN 1 and SERN 2.In general,the performance of SERN 2 is superior to SERN 1.
- single-expansion-ramp-nozzle /
- shock wave/boundary-layer interaction /

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参考文献(12)

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