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Test of wall pressure during transition of flow separation modes in nozzle(PDF)

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

Issue:
2015年05期
Page:
101-105
Research Field:
测控与试验
Publishing date:

Info

Title:
Test of wall pressure during transition of flow separation modes in nozzle
Author(s):
WANG Yibai;  LU Xingyu;  LI Bo;  LIU Yu
School of Astronautics, Beijing Univ. of Aeronautics and Astronautics, Beijing 100191, China
Keywords:
rocket engine nozzle;  flow separation;  TOP nozzle;  wall pressure;  experiment
PACS:
V431-34
DOI:
-
Abstract:
Cold flow testing experiments for wall pressure of a thrust optimized parabolic (TOP) nozzle were conducted at different nozzle pressure ratios to study the transition process at different flow separation modes in TOP nozzles, and to ensure the characteristics of the pressure distribution and the critical pressure ratio of separation mode transition. The wall pressure of different positions was measured. The result shows that the transition from free shockwave separation to restricted shockwave separation happens in the nozzle pressure ratio (NPR, ratio of local nozzle pressure to ambient pressure) range of 17.61~18.49. The asymmetrical pressure distribution phenomenon during the transition was captured. It was also found that the local wall pressure intensity at downstream of the restricted proves that the measured pressure distributions is corresponding to different flow separation modes.

References:

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