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Combined effects of inlet airflow temperature and upper expansion angle on the performance of scramjet nozzle

Yifang Sun (Kharkiv Aviation Institute, National Aerospace University, Kharkiv, Ukraine and Anhui Jiebo Hytron Provincial Academician Research Institute, Huaibei, China)
Chunxu Duan (HuiYang Aviation Propeller Co. Ltd., Aviation Industry Corporation of China, Baoding, China)
Renfu Li (School of Aerospace Engineering, Huazhong University of Science and Technology, Wuhan, China)
Chenghu Li (School of Aerospace Engineering, Huazhong University of Science and Technology, Wuhan, China)

Aircraft Engineering and Aerospace Technology

ISSN: 0002-2667

Article publication date: 2 March 2022

Issue publication date: 30 May 2022

144

Abstract

Purpose

The purpose of this paper is to study the combined effects of inlet airflow temperature and the expansion angle of the upper expansion surface (upper expansion angle) on the performance of the scramjet nozzle.

Design/methodology/approach

The Spalart-Allmaras turbulence two-dimensional model of the nozzle is established for the study. The influence of inlet airflow temperature on the performance of the nozzle is analyzed by detecting the change of the wall pressure of the nozzle. The three angles are chosen for the upper expansion angle (βb) in the model: 8°, 12° and 16°. The temperature of inlet airflow is 600–1,800 K.

Findings

The study results show that when the βb is 8° and 16°, the wall pressure of the nozzle has a complicated and large fluctuation with the inlet airflow temperature, while the wall pressure has little change as βb is 12°; the thrust coefficient, pitching moment coefficient and lift coefficient of the nozzle fluctuate greatly with the increase of the inlet airflow temperature when βb is 8° and 16°, while the thrust coefficient, pitching moment coefficient and lift coefficient have little fluctuation as βb is 12°.

Originality/value

The study of the combined effects of the inlet airflow temperature and upper expansion angle on the performance of the scramjet nozzle can provide guidance for the design of scramjet nozzles.

Keywords

Acknowledgements

This work was supported by the National Scholarship Council of China (No. 201908360296).

Conflicts of Interest: The authors declare that there is no conflict of interest regarding the publication of this paper.

Citation

Sun, Y., Duan, C., Li, R. and Li, C. (2022), "Combined effects of inlet airflow temperature and upper expansion angle on the performance of scramjet nozzle", Aircraft Engineering and Aerospace Technology, Vol. 94 No. 7, pp. 1037-1046. https://doi.org/10.1108/AEAT-08-2021-0237

Publisher

:

Emerald Publishing Limited

Copyright © 2022, Emerald Publishing Limited

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