|Table of Contents|

Optimal stage-transition Mach number of the rocket-ramjet combined engine(PDF)

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

Issue:
2021年06期
Page:
46-54
Research Field:
专刊
Publishing date:

Info

Title:
Optimal stage-transition Mach number of the rocket-ramjet combined engine
Author(s):
WANG Youyin; TANG Jingfeng; CHANG Juntao; GAO Jin; BAO Wen
(School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)
Keywords:
rocket-ramjet combined engine scramjet transition Mach number fuel consumption engine performance
PACS:
V236
DOI:
-
Abstract:
As the combined engine is widely used on the reusable hypersonic vehicle,the selection of transition Mach number of combined engines is significant to the overall performance of the entire flight system. By calculating the flight process of rocket-ramjet combined propulsion system with the flight simulation model,the characteristics of 0～6 Ma acceleration process and the influence factors of the cruising duration corresponding to different acceleration schemes were analyzed. The analysis showed that lower transition Mach number leads to higher fuel consumption of ramjet engine,but higher transition Mach number leads to higher fuel consumption of rocket engine. So,there is an optimal transition Mach number. The analysis on the influences of transition Mach number showed that the optimal transition Mach number largely depends on the specific impulse of rocket engine,and the high specific impulse and thrust rocket engine of the wide range propulsion system can increase the cruise time of hypersonic vehicles.

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