|Table of Contents|

Experimental study on propagation mode of detonation wave in annular channel(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2021年06期
Page:
101-110
Research Field:
专刊
Publishing date:

Info

Title:
Experimental study on propagation mode of detonation wave in annular channel
Author(s):
YUAN Xueqiang; JIANG Luxin; ZHANG Duo; LIU Shijie
(Science and Technology on Scramjet Laboratory,National University of Defense Technology,Changsha 410073,China)
Keywords:
rotating detonation engine annular channel propagation mode experimental study wave structure velocity distribution
PACS:
V439
DOI:
-
Abstract:
The design of the annular combustion chamber is a key factor affecting the performance of a rotating detonation engine. Studying the propagation process of the detonation wave through the annular channel can provide a powerful guide for the design of the combustion chamber. In order to systematically study this propagation process and its propagation mode,the flow field shadow observation method is used to experimentally observe the propagation of detonation wave through the annular channel,and the propagation mode is divided in detail based on the influence of the inner and outer walls of the channel.The formation mechanism and velocity characteristics of each propagation mode are analyzed. The research results indicate that the propagation mode of detonation wave can be divided into unstable and stable propagation modes according to whether the wave front is decoupled. While considering the change of the Mach-stem,the propagation mode can be subdivided into Mach-stem growing type,steady type and decaying type. In the unstable propagation mode,the wave velocity experiences obvious attenuation while the velocity is relatively steady in the stable propagation mode,the detonation wave front near the outer wall is overdriven,and the overdriven degree increases with the attenuation of the Mach-stem. With the increase of the initial pressure,the ability of the detonation wave in realizing stable propagation is enhanced,and the Mach-stem shows a growing-steady-decaying transition trend,while the increase of the ratio of the wall curvature radius to the channel width makes the Mach-stem present a decaying-steady-growing transition law.

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