Drag and heat reduction performance of a dual-jet spike configuration in hypersonic flow

WANG Junfeng; LI Jun; LUO Shibin

doi:10.7638/kqdlxxb-2023.0040

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Drag and heat reduction performance of a dual-jet spike configuration in hypersonic flow

更新时间：2026-05-28

- Drag and heat reduction performance of a dual-jet spike configuration in hypersonic flow
- Vol. 42, Issue 2, Pages: 34-46(2024)
- 作者机构：
  
  中南大学航空航天技术研究院,长沙,410083
- 作者简介：
- 基金信息：
- DOI：10.7638/kqdlxxb-2023.0040
  CLC： V211.3;V411.3;V435+.14
- Published：2024
- 稿件说明：
移动端阅览
王俊峰, 李珺, 罗世彬. 双射流激波针在高超声速下的减阻降热特性[J]. 空气动力学学报, 2024, 42(2): 34−46.

WANG Junfeng, LI Jun, LUO Shibin. Drag and heat reduction performance of a dual-jet spike configuration in hypersonic flow[J]. 2024, 42(2): 34-46.
王俊峰, 李珺, 罗世彬. 双射流激波针在高超声速下的减阻降热特性[J]. 空气动力学学报, 2024, 42(2): 34−46. DOI： 10.7638/kqdlxxb-2023.0040

WANG Junfeng, LI Jun, LUO Shibin. Drag and heat reduction performance of a dual-jet spike configuration in hypersonic flow[J]. 2024, 42(2): 34-46. DOI： 10.7638/kqdlxxb-2023.0040.

摘要

严酷的气动力和气动热环境是制约高超声速飞行器发展的两个重要因素，如何高效地降低高超声速飞行过程中的阻力和热流一直是设计者们追求的目标。为此，本文提出了一种结合后向射流和根部逆向射流的双射流激波针新构型。数值模拟研究发现：该构型能够利用后向射流产生的反作用力削减逆向射流附加阻力对减阻效果的影响，因此与无射流和单一射流方案相比，双射流激波针的流场结构显著改变，减阻降热效果极大提高。此外，增大激波针的长径比（

）有利于提高双射流激波针的减阻效果，但会使降热性能有所下降：在本文研究中，当激波针长径比从1增大到 4时，结构的总阻力系数降低了71.9%，而钝体总热流增大了13.7倍。同时，增大射流总压比

可以显著降低壁面热流：当逆向射流总压比（

）或后向射流总压比（

）大于0.4时，钝体壁面的热流极低并开始出现负值；然而，阻力系数随

和

的变化趋势恰好相反，随着

从0.2增大到0.5，由于逆向射流附加阻力的影响，结构总阻力系数增大了66.7%，而得益于后向射流的推力作用，结构总阻力系数则降低了59.3%。

Abstract

High aerodynamic drag and severe aeroheating are the two most important factors impeding the development of hypersonic vehicles. Thus

how to reduce the drag and heat flux effectively in hypersonic flight has attracted worldwide attention. In this paper

a novel strategy combining a spike and a dual-jet has been propose

d for the drag reduction and thermal protection. In this configuration

the reaction force generated by the root jet can balance the additional resistance of the rear jet

and the surface heat flux of the vehicle can also be reduced effectively. The flow characteristics and the drag/heat reduction efficiency is explored by numerical simulations. Meanwhile

the influence of the spike length and the total jet pressure on the drag and heat flux are quantitatively analyzed. The results reveal that flow structures of the dual-jet spike configuration are significantly changed

and the drag and heat reduction efficient is greatly improved compared to the cases with a single jet or without any jet. In addition

increasing the spike length ratio (

) is beneficial to improve the drag reduction performance

but has a negative effect on the thermal protection. Specifically

by increasing the spike length

from

= 1 to

= 4

the drag coefficient of the dual-jet spike configuration is decreased by 71.9%

while the total heat flux on the blunt body is increased by 13.7 times. On the other hand

the wall heat flux can be remarkably reduced by increasing the total jet pressure

and it becomes negative when the total pressure ratio of the opposing jet (

) or that of the rear jet (

) is larger than 0.4. However

the variation tendency of the drag coefficient with the increasing of

and

is completely opposite. Due to the drag induced by the opposing jet

the total drag coefficient of the dual-jet spike configuration is increased by 66.7% from

= 0.2 to

= 0.5. On the contrary

thanks to the thrust generated by the rear jet

the total drag coefficient of the dual-jet spike configuration is decreased by 59.3% from

= 0.2 to

= 0.5.

关键词

Keywords

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