The Influences of Scavenging Conditions and Port Geometry on Flow Characteristics and In-cylinder Swirl Flow Field of OP2S Engine

WU Han; HUANG Yanrui; YANG Ziming; SHI Zhicheng; ZHANG Yongquan; DUAN Jialong

doi:10.12382/bgxb.2025.0289

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The Influences of Scavenging Conditions and Port Geometry on Flow Characteristics and In-cylinder Swirl Flow Field of OP2S Engine

更新时间：2026-04-24

- The Influences of Scavenging Conditions and Port Geometry on Flow Characteristics and In-cylinder Swirl Flow Field of OP2S Engine
- Acta Armamentarii Vol. 47, Issue 3, Pages: 250289(2026)
- 作者机构：
  
  北京理工大学机械与车辆学院，北京 100081
  北京理工大学长三角研究院，浙江嘉兴 314019
  北京理工大学（珠海），广东珠海 519088
- 作者简介：
- 基金信息：
- DOI：10.12382/bgxb.2025.0289
  CLC： TK422
- Received：16 April 2025，
  
  Online First：04 April 2026，
  
  Published：2026-03
- 稿件说明：
移动端阅览
WU Han, HUANG Yanrui, YANG Ziming, et al. The Influences of Scavenging Conditions and Port Geometry on Flow Characteristics and In-cylinder Swirl Flow Field of OP2S Engine[J]. Acta Armamentarii, 2026, 47(3): 250289.
DOI：

WU Han, HUANG Yanrui, YANG Ziming, et al. The Influences of Scavenging Conditions and Port Geometry on Flow Characteristics and In-cylinder Swirl Flow Field of OP2S Engine[J]. Acta Armamentarii, 2026, 47(3): 250289. DOI： 10.12382/bgxb.2025.0289.

摘要

为寻求对置活塞二冲程（Opposed Piston Two Stroke，OP2S）发动机换气品质提升的方法，开展进气条件和气口参数对OP2S发动机流通特性和缸内涡流特性的影响研究。采用气道稳流试验和计算流体力学仿真相结合的方法，分析了进气压力、换气压差、气口升程和气口倾角4种参数对流量系数与涡流比的影响规律。研究结果表明：增大换气压差能够提高气体流速，通过增强气体惯性抑制气口处分离区的形成，从而显著提高流量系数和涡流比；增加气口升程会加强气口侧壁面处的流动分离现象导致流量系数减小，同时影响缸内速度分布，使涡流比增长趋势逐渐变缓；在顺时针旋流导向的气口构型中，左侧倾角采用大角度，左侧倾角的变化对流量系数影响较小，增大右侧倾角会扩大气口壁面分离区导致流量系数减小，增大两侧倾角均会明显提高气流切向速度使涡流比增大。

Abstract

To investigate the approaches for enhancing the gas exchange quality of opposed-piston two-stroke（OP2S）engine

this paper studies the effects of intake conditions and port parameters on flow characteristics and in-cylinder swirl dynamics. The steady-flow scavenging experiment and computational fluid dynamics simulation are conducted

and the influence mechanisms of four critical parameters such as intake pressure

scavenging pressure difference

port lift

and port inclination angle on the discharge coefficient and swirl ratio are analyzed. The results indicate that the scavenging pressure difference can be increased to elevate gas flow velocity. The the formation of flow separation zone near the port is inhibited by enhancing gas inertia

thereby significantly improving both the discharge coefficient and swirl ratio. The port lift is increased to intensify the flow separation along the sidewalls of port

thereby reducing the discharge coefficient. Simultaneously

it alters the in-cylinder velocity distribution

causing the growth rate of swirl ratio to gradually diminish. In a clockwise-swirl-oriented port configuration

the left ports feature a large inclination angle. The variations in the left inclination angle has a negligible influence on the discharge coefficient. However

the right inclination angle is increased to expand the flow separation zone along the port walls

thereby reducing the discharge coefficient. Elevating the inclination angles on both sides enhances the tangential velocity of gas flow

leading to a significant increase in the swirl ratio.

关键词

Keywords

references

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