超临界CO<sub>2</sub>磨料射流流场影响因素的模拟分析

贺振国; 李根生; 王海柱; 沈忠厚; 田守嶒

doi:10.11883/1001-1455(2015)05-0659-09

超临界CO₂磨料射流流场影响因素的模拟分析

doi: 10.11883/1001-1455(2015)05-0659-09

中国石油大学油气资源与探测国家重点实验室, 北京 102249

基金项目: 国家自然科学基金项目(51210006, 51304226);国家重点基础研究发展计划(973计划)项目(2014CB239203)

详细信息

作者简介:
贺振国(1986—), 男, 博士研究生

通讯作者:
李根生, ligs@cup.edu.cn

中图分类号: O354
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- 文章访问数: 2592
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- 被引次数: 0
出版历程
- 收稿日期: 2014-02-19
- 修回日期: 2014-07-14
- 刊出日期: 2015-10-10

A simulation analysis of factors influencing the flow field of the abrasive supercritical CO₂ jet

State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China

摘要

摘要: 为了揭示超临界CO₂磨料射流流场特性，利用计算流体动力学模拟软件，对超临界CO₂磨料射流结构及不同因素对射流流场的影响规律进行了研究。结果表明：超临界CO₂磨料射流轴向速度和冲击力随着喷距的增大，先增大后减小，即存在最优喷距，喷射压差为10~30 MPa时最优喷距为3~6倍喷嘴直径；喷射压差一定时，围压由10 MPa增至30 MPa对射流速度场及液相冲击力会造成较小的负面影响。通过超临界CO₂射流破岩实验对上述2因素进行了辅助对比验证；流体温度由333 K增至413 K，固液两相轴向速度增大，而流体密度降低，导致液相冲击力减弱；磨料浓度由3.0%连续增至11.0%，射流固液两相轴向速度逐渐降低，降幅逐渐减小。
- 流体力学 /
- 超临界CO₂ /
- 计算流体动力学模拟软件 /
- 磨料射流 /
- 轴向速度
Abstract: To confirm and reveal the characteristics of the flow field of the abrasive supercritical CO₂ jet, the structure of the jet and the influence of the ambient factors were analyzed through numerical simulation, with the computational fluid dynamics software. Results show that the axial velocities of the fluid and particles on the wall firstly increase and then descend as the standoff distance increases, as well as the impact pressure of the fluid, which means that there is an optimal standoff distance where their peak values exist respectively and it is 3-6 times of the jet nozzle diameter at the differential pressure of 10-30 MPa; given fixed jet differential pressure, increase of the confining pressure from 10 MPa to 30 MPa has a weak negative effect on the axial velocity of the jet fluid. The supercritical CO₂ jet-breaking-rock experiment was conducted to provide test to the results of the numerical simulation. The velocities of the fluid and particles increase as the temperature goes up from 333 K to 413 K, while the impact pressure of the supercritical CO₂ fluid becomes weaker because of fluid density decrease as the volume fraction of the abrasive particles is set from 3.0% to 11.0% in a row, the velocity of each phase gradually decreases and the variation gradually gets smaller.
- fliud mechanics /
- supercritical CO₂ /
- computational fluid dynamics software /
- abrasive jet /
- axial velocity

HTML全文

图 1 数值模拟区域截面示意图

Figure 1. Plane sketch of the geometric model

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图 2 数值模拟区域的三维几何模型

Figure 2. The physical model of the flow field

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图 3 不同横断面上流体速度的径向分布

Figure 3. Distribution of axial velocity in the flow field at different standoff distances

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图 4 液相对壁面冲击力随喷距变化曲线

Figure 4. Jet impact pressure varied with standoff distance

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图 5 超临界CO₂射流破岩实验射孔深度随喷距的变化

Figure 5. Perforation depth varied with standoff distance in the sc-CO₂ jet rock-breaking experiment

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图 6 不同喷距流场中颗粒轴向速度随轴向位置的变化

Figure 6. Axial velocity of particles at different positions in geometric models with different standoff distances

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图 7 不同围压下流体轴向速度的径向分布

Figure 7. Distribution of axial velocity at different confining pressure

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图 8 超临界CO₂射流破岩实验射孔深度随围压的变化

Figure 8. Perforation depth varied with confining pressure in the sc-CO₂ jet rock-breaking experiment

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图 9 入射流体温度对流体轴向速度的影响

Figure 9. Distribution of axial velocity of fluid on the central line at different jet inlet temperatures

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图 10 入射流体温度对颗粒轴向速度的影响

Figure 10. Distribution of axial velocity of particles on the central line at different jet inlet temperatures

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图 11 流体对壁面冲击力随温度变化曲线

Figure 11. Jet impact pressure varied with jet inlet temperatures

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图 12 不同入射流体温度条件下射流中轴线上流体密度分布

Figure 12. Distribution of sc-CO₂ fluid density on the central line at different jet inlet temperatures

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图 13 不同磨料浓度下射流固液两相轴向速度分布

Figure 13. Distribution of axial velocity of fluid and particles at different concentrations of discrete phase

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