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| 电控汽油喷油器瞬态流动的建模方法及其数值模拟 |
| Modeling method and numerical simulation of transient flow in the electronic gasoline injector |
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| DOI： |
| 中文关键词: 电控汽油喷油器 建模方法 瞬态特性 空化现象 |
| 英文关键词:electronic control gasoline injector modeling method transient characteristics cavitation phenomenon |
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| 中文摘要: |
| 为了研究电控汽油喷油器内部瞬态流动情况,建立了喷油器的几何模型和数学模型.采用FLUENT软件中的动网格技术和自编程序控制模型的边界条件,计算了球阀的受力情况和速度,从而模拟了喷油器球阀的运动过程.该建模方法使每一步的数值模拟计算都依赖于前一步的计算结果,从而保证了数值模拟的连续性.通过每一步的迭代,得到每一时刻喷油器内部流体的压力、速度、流量.结果表明:该喷油器瞬态流动的建模方法是行之有效的,其数值模拟结果和实验结果相吻合.该方法也揭示了喷油器喷孔拐角处空化现象的产生、发展和消失过程,并可给出喷孔出口处速度分布情况. |
| 英文摘要: |
| In order to study the transient flow in the electronic gasoline injector, the geometric model and mathematic model of the injector were established in this paper. A dynamic grid technique in the FLUENT code and a self compiled program were used to control the boundary conditions, and the movement of the ball valve for the injector was simulated including calculations of the ball velocity and forces. In this modeling method, every step of computation was decided by the former flow field so that the consistency of the numerical simulation was ensured. Through every step of iteration, we can get statistics of pressure, velocity and flow at any time inside the injector. The results showed that the transient flow modeling method for the injector is effective and the acquired simulation results show good agreement with the experimental data. Cavitation generation, expansion and disappearance at the nozzle corner during fuel injection were also investigated and the velocity distribution at the nozzle exit was given by the simulation. |
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