Experimental and Numerical Study of Underwater Scarfed Nozzle Jet

WANG Xugang; YE Yonghao; QU Zehui; HE Baiyan; LIU Huaping

doi:10.12382/bgxb.2025.0360

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Experimental and Numerical Study of Underwater Scarfed Nozzle Jet

更新时间：2026-04-24

- Experimental and Numerical Study of Underwater Scarfed Nozzle Jet
- Acta Armamentarii Vol. 47, Issue 3, Pages: 250360(2026)
- 作者机构：
  
  哈尔滨工程大学船舶工程学院，黑龙江哈尔滨 150009
  华中科技大学航空航天学院，湖北武汉 430074
- 作者简介：
- 基金信息：
- DOI：10.12382/bgxb.2025.0360
  CLC： TJ630
- Received：12 May 2025，
  
  Online First：06 February 2026，
  
  Published：2026-03
- 稿件说明：
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WANG Xugang, YE Yonghao, QU Zehui, et al. Experimental and Numerical Study of Underwater Scarfed Nozzle Jet[J]. Acta Armamentarii, 2026, 47(3): 250360.
DOI：

WANG Xugang, YE Yonghao, QU Zehui, et al. Experimental and Numerical Study of Underwater Scarfed Nozzle Jet[J]. Acta Armamentarii, 2026, 47(3): 250360. DOI： 10.12382/bgxb.2025.0360.

摘要

针对水下斜切喷管矢量控制技术，开展不同喷射压比及斜切角度下的射流试验观测和数值模拟研究，详细分析静水环境下射流初期的流场演化及喷管推力特性。研究结果表明：斜切喷管射流的非对称发展主要经历短边侧椭球状凸起气团-扁平盘状附壁气泡-中间囊状凸起-中心回缩形成附壁盘状-中心再次凸起-持续轴向发展6个阶段；在斜切射流发展初期，气泡的非对称发展导致推力向长边侧偏斜，在稳定发展段，推力偏斜角度较小；随着喷射压比的增大，各阶段相同时刻气体体积越大，气体与周围流体的相互干扰增强，尤其是持续发展阶段，远离喷管出口的气液掺混与剪切增强，团状气泡脱落越明显，导致长边侧壁面压力脉动幅值较垂直射流时显著升高。

Abstract

Focusing on the vectoring control technology of underwater scarfed nozzles

the experimental observation and numerical simulation are conducted on the scarfed nozzle jets under different injection pressure ratios and scarfed angles

and the evolution of flow field during the initial jet stage and the thrust characteristics of nozzle in a static water environment are analyzed in detail. The results indicate that the asymmetric development of the scarfed nozzle jet goes through six stages:an ellipsoidal bulge gas cluster on the short-edge side

a flat disk-shaped wall-attached bubble

a central saclike bulge

subsequent central retraction forming a wall-attached disk-shaped structure

re-bulging at the center

and ultimately sustained axial development. In the initial stage of the scarfed jet development

the asymmetric evolution of the bubble induces the thrust to deviate towards the long-edge side. In the stable stage

the thrust deviation angle is notably reduced. With the increase of the jet pressure ratio

the gas volume at the same moment in each stage becomes larger

leadinsustained g to an enhanced interaction between the gas and surrounding fluid. Particularly during the development stage

the gas-liquid mixing and shear forces intensify at regions far from the nozzle exit. This results in more pronounced shedding of clustered bubbles

ultimately causing a significant increase in the pressure fluctuation amplitude on the long-side wall surface compared to vertical jet conditions.

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references

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