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2025 , Vol. 34 >Issue 5: 1798 - 1812

DOI: https://doi.org/10.1007/s11630-025-2175-5

Experimental Investigation of Ramjet Rotating Detonation Fueled by Kerosene under Different Outlet Area Ratios with S-Shaped Isolator

  • MA Ming ,
  • GUO Shanguang ,
  • WU Yun ,
  • KOU Yitao ,
  • ZHOU Jianping
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  • 1. National Key Lab of Aerospace Power System and Plasma Technology, Xi’an Jiaotong University, Xi’an 710049, China
    2. National Key Lab of Aerospace Power System and Plasma Technology, Air Force Engineering University, Xi’an 710038, China
    3. School of Mechanical Engineering, Xian Jiaotong University, Xi’an 710049, China

网络出版日期: 2025-09-01

基金资助

Research reported in this publication was supported by the National Natural Science Foundation of China (Grant No. 52025064).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2025
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Experimental Investigation of Ramjet Rotating Detonation Fueled by Kerosene under Different Outlet Area Ratios with S-Shaped Isolator

  • MA Ming ,
  • GUO Shanguang ,
  • WU Yun ,
  • KOU Yitao ,
  • ZHOU Jianping
Expand
  • 1. National Key Lab of Aerospace Power System and Plasma Technology, Xi’an Jiaotong University, Xi’an 710049, China
    2. National Key Lab of Aerospace Power System and Plasma Technology, Air Force Engineering University, Xi’an 710038, China
    3. School of Mechanical Engineering, Xian Jiaotong University, Xi’an 710049, China

Online published: 2025-09-01

Supported by

Research reported in this publication was supported by the National Natural Science Foundation of China (Grant No. 52025064).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2025
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摘要

本文旨在实现旋转爆震燃烧室（RDC）与冲压发动机隔离段的高效耦合匹配及稳定运行。通过采用渐扩式S型隔离段，系统研究了不同出口面积比下旋转爆震波（RDW）的传播特性及隔离段压力回传行为。实验以液态航空煤油与空气为推进剂，在空气流量恒定为2.17 kg/s，当量比可调工况下开展，重点分析了RDW的典型模态，压力特性及模态分布规律。研究发现：中等面积比工况可获得主频为1138.63 Hz的稳定单波模态；减小出口面积比有利于增强爆震波强度，同时爆震波强度随当量比提升而增大，且在中等面积比内存在使爆震波强度最大化的最优当量比；增大出口面积比虽可拓宽可燃当量比边界，但“pop-out”现象更为明显。通过定义脉动压力衰减百分比与稳态压力衰减百分比，定量评估了S型隔离段压力回传程度。结果表明：旋转爆震模态下，出口面积比越小，脉动压力衰减百分比越大，压力回传程度越强；同时随着当量比增加，脉动压力衰减百分比呈上升趋势。在选定工况下，S型隔离段对爆震波脉动压力回传的抑制效果分别达71.53%和12.07%，对稳态压力回传的抑制效果分别为14.32%和45.55%。实验验证了S型隔离段方案可行性，为抑制爆震波压力反馈提供了新思路。

关键词： ramjet rotating detonation; outlet area ratio; pressure feedback; kerosene; S-shaped isolator

本文引用格式

MA Ming , GUO Shanguang , WU Yun , KOU Yitao , ZHOU Jianping . Experimental Investigation of Ramjet Rotating Detonation Fueled by Kerosene under Different Outlet Area Ratios with S-Shaped Isolator[J]. 热科学学报, 2025 , 34(5) : 1798 -1812 . DOI: 10.1007/s11630-025-2175-5

Abstract

In this paper, the objective is to achieve a successful coupling match and stable operation between the rotating detonation combustor (RDC) and the ramjet engine isolator. The propagation characteristics of the rotating detonation wave (RDW) under different outlet areas, as well as the pressure feedback behavior of the isolator, are examined through the use of a gradually expanded S-shaped isolator. Liquid aviation kerosene and air are employed as propellants, and experiments are carried out at a constant air flow rate of 2.17 kg/s and varying equivalence ratios (ERs). The typical mode, pressure, and mode distribution of RDW are analyzed. A stable single-wave mode with a dominant frequency of 1138.63 Hz is obtained at the medium area ratio. Reducing the outlet area ratio is beneficial for enhancing the intensity of the detonation wave. Simultaneously, the intensity of the detonation wave increases with the rise of the equivalence ratio, and there exists an optimal equivalence ratio within the medium area ratio, which maximizes the intensity of the detonation wave. With the increase of the outlet area ratio, the boundary of detonable equivalence ratio can be widened, although the pop-out phenomenon becomes more pronounced. The pressure feedback degree of the S-shaped isolator is evaluated by defining the percentage decays of pulsating pressure and steady-state pressure. In the rotating detonation mode, the smaller the outlet area ratio, the larger the percentage decay of pulsation pressure, indicating a greater extent of pressure feedback. At the same time, as the equivalence ratio is increased, the percentage decay of pulsation pressure shows an upward trend. Under the selected operating conditions, the suppression effects of the S-shaped isolator on the pulsating pressure feedback of the detonation wave are 71.53% and 12.07%, and the suppression effects on the steady-state pressure feedback are 14.32% and 45.55%. The experimental verification of the feasibility of the S-shaped isolator presents a novel concept for suppressing the pressure feedback of the detonation wave.

Key words： ramjet rotating detonation; outlet area ratio; pressure feedback; kerosene; S-shaped isolator

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