Flow separation unsteadiness in an over-expanded single expansion ramp nozzle

Combined with the focusing schlieren and dynamic pressure measurement technology, the flow field and nozzle wall pressure were experimentally measured, under the different nozzle pressure ratios (NPR) of the single expansion ramp nozzle (SERN). Time and frequency domain analysis provide unsteady flo...

Full description

Saved in:
Bibliographic Details
Published in:Journal of physics. Conference series 2019-08, Vol.1300 (1), p.12081
Main Authors: He, Chengjun, Li, Jianqiang, Li, Yaohua, Gao, Rongzhao, Fan, Zhaolin, Miao, Lei, Liang, Jinmin
Format: Article
Language:English
Subjects:
Dynamic pressure
Flow characteristics
Flow separation
Frequency analysis
Frequency domain analysis
Nozzle walls
Physics
Pressure measurement
Separation
Shear layers
Unsteady flow
Wall pressure
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Combined with the focusing schlieren and dynamic pressure measurement technology, the flow field and nozzle wall pressure were experimentally measured, under the different nozzle pressure ratios (NPR) of the single expansion ramp nozzle (SERN). Time and frequency domain analysis provide unsteady flow characteristics within the nozzle. The results show that the flow field structure inside SERN is asymmetry. The flow separation mode on the upper wall of the nozzle is restricted shock separation (RSS), while on the lower wall is free shock separation (FSS); in RSS mode, the pressure on the wall near the outlet sharply oscillated relative to FSS mode. Near separation point, the shock motion exhibits obvious low-frequency characteristics, and the separated shear layer has an influence on the wall pressure near the nozzle exit.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1300/1/012081