|Table of Contents|

Simulation and optimization design of hydrodynamic torque characteristics of ball-type regulating valves(PDF)

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

Issue:
2024年03期
Page:
53-64
Research Field:
目次
Publishing date:

Info

Title:
Simulation and optimization design of hydrodynamic torque characteristics of ball-type regulating valves
Author(s):
LIANG Wendong1; 2;  XU Jian1; 2;  LIU Bo1;  LI Youzhi1
1.Beijing Aerospace Propulsion Institute, Beijing 100076, China; 2.Laboratory of Science and Technology on Cryogenic Liquid Propulsion of CASC, Beijing 100076, China
Keywords:
regulating valve;  hydrodynamic torque;  numerical simulation;  influence factor;  optimization design
PACS:
V434
DOI:
10.3969/j.issn.1672-9374.2024.03.006
Abstract:
To obtain the hydrodynamic torque characteristics of the regulating valve used in liquid rocket engines, the Kubota cavitation model and standard k-ε turbulence model are utilized in this paper to numerically investigate the evolution of the flow field in the regulating valve. The numerical simulation results are compared with experimental data to verify the accuracy of the simulation model. The influence factors, distribution characteristics and evolution of hydrodynamic torque are analyzed quantitatively. The results indicate that the hydrodynamic torque depends on the opening, pressure difference and diameter of the flow passage. Under the same pressure difference, when the opening increases from 10 degrees to 80 degrees, the hydrodynamic torque monotonously increases and the direction is to close the valve. Under the same opening, when the pressure difference increases 3 times and 5 times, the hydrodynamic torque changes to about 3 times and 5 times respectively. The hydrodynamic torque distribution consists of the sealing surface moment and main passage moment. With the increase of the opening, the sealing surface moment first decreases and then increases, while the main passage moment first increases and then decreases. When the diameter of the flow passage decreases from 70 mm to 60 mm, the maximum value of hydrodynamic torque increases by 24.5 N·m. This is because under the same working condition, reducing the diameter of the flow passage will increase the valve opening, and the increasing value of the flow passage is greater than the decreasing value of the sealing surface torque. An optimization scheme is proposed to cut off the lower wall of the main channel in the original model, and the hydrodynamic torque of the optimized model is only 13.2 N·m at 100% working conditions. The flow coefficient of the optimized model remains unchanged. The maximum hydrodynamic torque of the optimization model decreases by 94.4 N·m, which greatly reduces the load of the control motor. An important reference is provided for improving the reliability of liquid rocket engines and achieving lightweight.

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