Potential of inertial instabilities for fuel film separation in port fuel injection engine conditions
Potential of inertial instabilities for fuel film separation in port fuel injection engine conditions
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端口燃油喷射发动机条件下油膜分离的惯性不稳定性的可能性
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
C. Habchi
中科院分区：
文献类型：
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作者：
F. Maroteaux;D. Llory;J. Le Coz;C. Habchi
摘要在进气道燃油喷射发动机中，在进气阶段，积聚在进气门附近的液体油膜被撕裂并进入气缸。为了预测缸内混合气的制备过程，建立了进气门锐缘附近油膜分离的模型。一个分离的标准是使用一个类比瑞利-泰勒不稳定性驱动的惯性力的电影。分离准则的临界值是使用在二维风洞中获得的实验数据进行调整的，该风洞装有不同形状的阀座，并再现火花点火发动机进气的主要特性。计算流体动力学模拟使用KMB代码，修改后的版本KIVA-2已经包括一个电影模型和随机拉格朗日描述的喷雾。对一台四缸1.9升进气道燃油喷射发动机进气冲程的计算证实，在进气冲程结束时，燃油液滴没有完全汽化。
Abstract In port fuel injection engines, the liquid fuel film accumulated in the vicinity of intake valves is torn away and goes into the cylinder during the intake phase. In order to predict the fuel mixture preparation inside the cylinder, a model for the fuel film separation near the sharp edges of the intake valves has been developed. A separation criterion is set up using an analogy with Rayleigh-Taylor instabilities driven by the inertial forces of the film. The critical value for the separation criterion is adjusted using experimental data obtained in a two-dimensional wind tunnel fitted with different steps shaped as the valve seat and reproducing the main characteristics of the intake of a spark ignition engine. Computational fluid dynamics simulations are performed using the KMB code, a modified version of KIVA-2 already including a film model and a stochastic Lagrangian description of the spray. Computation for the intake stroke on a four-cylinder 1.9 litre port fuel injection engine confirms that the fuel droplets are not completely vaporized at the end of the intake stroke.