Characteristic Analysis on Effects of High-Energy Pipe Wall Friction on Steam Jets

XU Yanming; XIN Zhiqiang; HE Zheng; CAI Yu

doi:10.21656/1000-0887.450047

Volume 46 Issue 2

Feb. 2025

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Article Navigation > Applied Mathematics and Mechanics > 2025 > 46(2): 142-153

XU Yanming, XIN Zhiqiang, HE Zheng, CAI Yu. Characteristic Analysis on Effects of High-Energy Pipe Wall Friction on Steam Jets[J]. Applied Mathematics and Mechanics, 2025, 46(2): 142-153. doi: 10.21656/1000-0887.450047

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Characteristic Analysis on Effects of High-Energy Pipe Wall Friction on Steam Jets

doi: 10.21656/1000-0887.450047

XU Yanming^1
,,
XIN Zhiqiang^{1
,
,},
HE Zheng²,
CAI Yu²

1.
College of Mechanics and Engineering Science, Hohai University, Nanjing 210098, P.R.China
2.
Chinergy Co., Ltd., Beijing 100193, P.R.China

Received Date: 2024-03-26
Rev Recd Date: 2024-04-24
Publish Date: 2025-02-01

Abstract

Abstract

The steam jetting during the double-end fracture of high-energy pipelines was studied through numerical simulations. The effects of stagnation pressure and pipe wall friction on the jet cone and impingement forces were investigated, and the patterns of velocity, temperature, and pressure in the jet cone were summarized. Additionally, by comparison of the impingement forces under various inlet conditions with the results calculated based on the design criteria, the applicability of the design criteria beyond the applicable pressure range was studied. The results show that, the pressure and temperature of the steam jet decrease rapidly within a certain distance from the nozzle outlet, while the velocity rapidly increases, followed by fluctuations and changes. As the distance from the nozzle outlet increases, the velocity and temperature in the jet cone gradually decrease, and the pressure is close to the atmospheric pressure. The initial spread angle of the jet cone, the influence zone of the jet cone, and the impingement force are positively correlated with the inlet pressure, and negatively correlated with the roughness of the inner wall of the nozzle. The assumption of the initial jet cone angle in the design criteria is not universal, and the actual initial jet cone angle exceeds 45° set by the standard model at higher stagnation pressures. In the case where the whole jet impinges on the flat plate, according to the design criteria, the standard model can precisely predict the impingement force of the steam jet in the ideal pipe without wall friction. However, under the design criteria, there will be some deviation to evaluate the impingement force on a real pipe jet with wall friction, and this deviation will increase with wall friction and pressure.
- igh-energy pipeline,
- steam jet,
- wall friction,
- impingement force

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References(30)

References

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