Quasi-One-Dimensional Method for Ejecting Process in RBCC Engine

被引：0
|
作者：
Chen J. [1 ]
Bai H.-C. [1 ]
Wan B. [1 ]
机构：
[1] Science and Technology on Scramjet Laboratory, Aerospace Technology Institute, CARDC, Mianyang
来源：
Tuijin Jishu/Journal of Propulsion Technology | 2022年 / 43卷 / 08期
关键词：
Critical back pressure; Ejecting flow; Entrainment ratio; Quasi-one-dimensional method; RBCC engine; Verification;
D O I：
10.13675/j.cnki.tjjs.200915
中图分类号：
学科分类号：
摘要：
To improve the accuracy of ejecting model，a new method is established based on the mechanism of ejecting process. The mass exchange caused by velocity difference between the primary and the second flow is selected to be the control factor，and the parameter profile at the section where the momentum of the primary flow covers the whole normal cross-section is taken to calculate the ejecting process. CFD and experiment results are used to verify the method. The comparison shows that the parameter profile calculated by this new method is approximate to the CFD results. While the primary flow is over-expanded and slightly under-expanded，the error of the entrainment ratio calculated by this method is 4.56%. While the primary flow is deeply under-expanded，the error of the entrainment ratio is 6% with the correction of pressure at the normal cross-section by characteristic method. And the precision is higher than conventional Fabri mode. This new method can calculate the critical back pressure accurately，so it is applicative for the RBCC engine. © 2022 Journal of Propulsion Technology. All rights reserved.
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