|Table of Contents|

Dynamic simulation of factors affecting the adjustment accuracy for adjustable cavitation venturi(PDF)

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

Issue:
2024年03期
Page:
65-74
Research Field:
目次
Publishing date:

Info

Title:
Dynamic simulation of factors affecting the adjustment accuracy for adjustable cavitation venturi
Author(s):
TIAN Liang1; 2;  HAN Xu1; 2;  YUAN Jianzhou1; 2;  ZHU Shaohua3
1.College of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China; 2.Hebei Key Laboratory of Geothermal Energy Utilization Technology, Cangzhou 062550, China; 3.College of Astronautics, Northwestern Polytechnical University, Xi'an 710072, China
Keywords:
adjustable cavitation Venturi;  adjustment accuracy;  numerical simulation;  dynamic grid;  adjusting cone eccentricity;  reverse motion
PACS:
V432
DOI:
10.3969/j.issn.1672-9374.2024.03.007
Abstract:
The factors affecting the adjustment accuracy of the tunable cavitation Venturi are studied for engineering application. The flow linearity and internal flow characteristics of the designed tunable cavitation Venturi are simulated by using the Schnerr-Sauer mixed fluid hole model in FLUENT under dynamic conditions. The influence of eccentric-reverse motion on the adjustment accuracy is also studied. The results show that the length of the cavitation section increases and the precision decreases because the initial movement of the adjustable cavitation cone does not enter the throat. The linearity of flow decreases at the initial stage due to the influence of throttling surface, and the linearity is the best and the accuracy is the highest within the range of 12% to 70% of percentage flow. The influence of flow rate on the accuracy of cavitation Venturi is less than 5%. When the eccentricity of the adjusting cone is 0.02 mm and 0.05 mm, the accuracy of adjusting the length of the cavitation zone is less than 20%, but it is increased to 40% when the eccentricity is 0.10 mm. At this time, the cavitation zone in the gradually expanding section will shift, and the pressure distribution is uneven, and the upper side increases while the lower side decreases, resulting in pressure oscillation. The influence of different eccentricity values on the accuracy of throat flow regulation is less than 4%. Because the initial cavitation section length is too short, the cavitation characteristics are weakened, the change rate of the cavitation zone is slowed down, and the accuracy of flow regulation is less than 3%.

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