|Table of Contents|

Research on internal flow field characteristics of RBCC during mode transition(PDF)

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

Issue:
2021年06期
Page:
39-45
Research Field:
专刊
Publishing date:

Info

Title:
Research on internal flow field characteristics of RBCC during mode transition
Author(s):
LI Menglei1; YANG Xue2; YANG Yiyan2; LI Peibo1; SHI Lei2
(1.School of Aerospace Sciences,National University of Defense Technology,Changsha 410073,China 2.Science and Technology on Combustion,Internal Flow and Thermal-structure Laboratory, Northwestern Polytechnical University,Xian 710072,China)
Keywords:
rocket based combined cycle(RBCC)engine ejector-ramjet mode numerical simulation detached eddy simulation(DES) control
PACS:
V438
DOI:
-
Abstract:
In order to obtain the working characteristics of RBCC(rocket-based combined cycle)engine in the process of model transition,the numerical simulation of the flow field in the process of ejector-ramjet mode transition based on wide adjustment ratio rocket was carried out. The wave system structure and parameter distribution of RBCC isolator and rear combustor with specific geometry under the combined influence of rocket jet and back pressure were studied. Results show that affected by the rocket jet and back pressure,the flow field can be divided into three areas:the mainstream area,the back pressure influence area and the rocket jet influence area. Mainstream flow separation or gas recirculation occurs on the lower wall of combustor,which provides physical conditions for stable combustion. In the process of mode transition,it is most beneficial to maintain the stability of the flow field parameters by adjusting the rocket to a small flow state.At this point,the maximum variances of the pressure and mach number at the feature point are only 0.087 and 0.003 respectively,and the maximum volatility are 27.44% and 8.29% respectively.

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