发动机泄漏辅助制动数值模拟

罗福强; 杭瑾; 何仁

doi:10.19818/j.cnki.1671-1637.2009.05.010

发动机泄漏辅助制动数值模拟

doi: 10.19818/j.cnki.1671-1637.2009.05.010

江苏大学汽车与交通工程学院, 江苏镇江 212013

基金项目:

国家863计划项目 2006AA11A1B4

江苏省汽车工程重点实验室开放基金项目 QC200507

详细信息

作者简介:
罗福强(1963-), 男, 湖南邵东人, 江苏大学教授, 工学博士, 从事发动机工作过程研究

中图分类号: U461.3
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- 被引次数: 0
出版历程
- 收稿日期: 2009-05-21
- 刊出日期: 2009-10-25

Numerical simulation of engine bleeding brake

School of Automobile and Traffic Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China

More Information

Author Bio:
LUO Fu-qiang(1963-), male, professor, PhD, + 86-511-8780072, 15432154321@163.com

摘要

摘要: 为了研究发动机泄漏辅助制动系统的工作过程, 应用计算流体力学软件Fluent建立了发动机泄漏辅助制动系统的数值模拟计算模型, 利用压力曲线对模型进行了验证, 计算了发动机泄漏制动时的缸内压力和流场分布情况。发现: 发动机泄漏辅助制动系统工作时, 排气门预开间隙大, 则缸内所能达到的压力峰值小, 得到的制动功率小。在压缩过程开始阶段与膨胀过程中, 出现了气体由排气道倒流入气缸中的现象, 且转速低, 排气门开度大时, 倒流现象出现得早。分析结果表明: 适当选择排气门预开间隙, 可以提高发动机泄漏辅助制动系统的制动功率。
- 汽车工程 /
- 发动机泄漏辅助制动 /
- 数值模拟 /
- 缸内压力 /
- 流场
Abstract: In order to investigate the working process of engine bleeding brake, a numerical simulation model was built by computational fluid dynamics software Fluent. Its prescision was tested by using pressure curves. The pressure and flowfield of cylinder under bleeding brake were calculated. It is pointed that when exhaust valve lash is larger, the maximum pressure of cylinder and brake power are smaller in the working process of engine bleeding brake. At the beginning of compress process and the expand process, gas flows into cylinder from exhaust pipe. When engine speed is higher and exhaust valve lash is larger, the starting of flow backwards is earlier. The result indicates that the brake power of engine bleeding brake will increase if the choice of exhaust valve lash is reasonable.
- automobile engineering /
- engine bleeding brake /
- numerical simulation /
- cylinder pressure /
- flowfield

HTML全文

图 1 发动机泄漏辅助制动系统网格模型

Figure 1. Grid model of engine bleeding brake

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图 2 试验结果与模拟结果对比

Figure 2. Comparison of simulation result with experimental result

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图 3 模拟结果对比

Figure 3. Comparison of simulation results

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图 4 转速为900 r·min^-1, 排气门开度为0.5 mm时的流场

Figure 4. Flowfields when engine speed is 900 r·min^-1 and exhaust valve lash is 0.5 mm

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图 5 转速为1 900 r·min^-1, 排气门开度为0.5 mm时的流场

Figure 5. Flowfields when engine speed is 1 900 r·min^-1 and exhaust valve lash is 0.5 mm

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图 6 转速为2 800 r·min^-1, 排气门开度为0.5 mm时的流场

Figure 6. Flowfields when engine speed is 2 800 r·min^-1 and exhaust valve lash is 0.5 mm

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图 7 转速为900 r·min^-1, 排气门开度为1.0 mm时的流场

Figure 7. Flowfields when engine speed is 900 r·min^-1 and exhaust valve lash is 1.0 mm

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图 8 转速为1 900 r·min^-1, 排气门开度为1.0 mm时的流场

Figure 8. Flowfields when engine speed is 1 900 r·min^-1 and exhaust valve lash is 1.0 mm

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图 9 转速为2 800 r·min^-1, 排气门开度为1. 0 mm时的流场

Figure 9. Flowfields when engine speed is 2 800 r·min^-1 and exhaust valve lash is 1.0 mm

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参考文献(10)

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