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基于PR(Peng-Robinson)状态方程,采用二维轴对称的两相流控制方程和相关文献中的混合规则,建立了超临界燃油喷射的数值模型并采用预处理方法进行求解.以正癸烷为替代燃料研究了超临界燃油喷射到静止超临界氮气环境中时射流长度和射流扩张角的变化规律.结果表明:超临界射流长度和射流扩张角随环境压力的升高而减小,随环境温度和喷射温度的升高而增加,且超临界射流长度受环境和喷射参数影响的敏感性稍高于射流扩张角.分析认为影响超临界喷射的两个主要因素是喷射密度比和喷射动量,且后者占主导地位.
Based on the Peng-Robinson equation of state (PR), a two-dimensional axisymmetric two-phase flow control equation and the mixing rule in the related literature were used to establish a numerical model of supercritical fuel injection and to solve it using a preconditioning method. The variation of jet length and jet divergence angle when supercritical fuel was injected into stationary supercritical nitrogen environment was studied as an alternative fuel.The results show that the length of supercritical jet and jet divergence angle decrease with the increase of ambient pressure, Temperature and jet temperature increase, and the sensitivity of the supercritical jet length to the jet and jet parameters is slightly higher than that of the jet divergence angle.The analysis shows that the two main factors affecting the supercritical jet are the jet density ratio and the jet momentum, And the latter dominates.