| 线性可调音速喷嘴工作特性仿真 |
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| 引用本文： | 成鹏,李清廉,张新桥,康忠涛,陈慧源.线性可调音速喷嘴工作特性仿真[J].国防科技大学学报,2015,37(6):48-53. |
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| 作者姓名： | 成鹏 李清廉 张新桥 康忠涛 陈慧源 |
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| 作者单位： | 国防科学技术大学航天科学与工程学院,国防科学技术大学航天科学与工程学院,国防科学技术大学航天科学与工程学院,国防科学技术大学航天科学与工程学院,国防科学技术大学航天科学与工程学院 |
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| 基金项目： | 国家高技术研究发展计划（863计划）;新世纪优秀人才支持计划（NCET-13-0156） |
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| 摘 要： | 为了满足组合发动机模态转换的要求,连续稳定调节推进剂流量十分关键。为此,针对气体推进剂,在常规音速喷嘴的基础上设计了一种可调音速喷嘴。通过塞锥改变音速喷嘴的节流面积,进而实现流量的连续调节。采用两次包络线方法设计塞锥型面,使得可调音速喷嘴具有线性的流量特性。采用计算流体动力学数值仿真研究可调音速喷嘴的工作特性。仿真结果表明反压小于临界反压时,可调音速喷嘴流量不受反压影响。可调音速喷嘴保持临界状态的临界反压比随流量的减小呈增大的趋势。线性可调音速喷嘴的流量与塞锥位置有较好的线性关系,其流量系数高且几乎不受塞锥位置的影响。
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| 关 键 词： | 可调音速喷嘴 线性 流量特性 流量调节 反压 |
| 收稿时间： | 2014/12/11 0:00:00 |
Simulation on the performance of linear throttleable sonic nozzle |
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| CHENG Peng,LI Qinglian,ZHANG Xinqiao,KANG Zhongtao and CHEN Huiyuan.Simulation on the performance of linear throttleable sonic nozzle[J].Journal of National University of Defense Technology,2015,37(6):48-53. |
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| Authors: | CHENG Peng LI Qinglian ZHANG Xinqiao KANG Zhongtao and CHEN Huiyuan |
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| Institution: | Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, China,Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, China,Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, China,Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, China and Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha 410073, China |
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| Abstract: | The transition between the operation modes for a combined-cycle engine makes it is necessary to throttle the mass flux of propellants stably. In present study, a throttleable sonic nozzle was designed based on the normal sonic nozzle. The throttleable sonic nozzle achieves continuously throttling through a plug moving along axis. By adopting the twice envelope method, the contour of the plug was designed to satisfy linear characteristic of mass flux. Moreover, the performance of the throttleable sonic nozzle was investigated through numerical simulation. It is found that the mass flux is independent on the back pressure when back pressure is lower than the critical back pressure. And the critical back pressure increases as mass flux decreases. Furthermore, the linear characteristic of mass flux was verified and results show that the discharge coefficient keeps at 0.95 when plug moves. |
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| Keywords: | throttleable sonic nozzle linear flow characteristic mass flow rate throttling back pressure |
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