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环膜液体射流的破碎机理研究对于GDI汽油机的雾化过程具有重要的意义。利用线性不稳定性理论研究了旋转气体运动对低阶和高阶模式黏性环膜液体射流破碎的影响。对于色散方程的数值计算结果表明,无论是对称模式还是非对称模式,低阶模式的扰动增长率通常较之高阶模式要大得多,但较之低阶模式扰动,高阶模式对气体旋转运动更为敏感。研究结果同时表明,对于非对称模式,无论是低阶模式还是高阶模式的扰动,气体旋转运动都是液体破碎的失稳因素;对于对称模式,气体旋转运动是低阶模式扰动的促稳因素,然而却是高阶模式扰动的强烈的失稳因素。
The research on the crushing mechanism of annular liquid jet is of great significance to the atomization process of GDI gasoline engine. The linear instability theory is used to study the effect of rotating gas motion on the jet breakup of low-order and high-order viscous membrane. The numerical results of the dispersion equation show that in both the symmetric and the asymmetric modes, the rate of increase of the low-order modes is usually much larger than that of the high-order modes. However, compared with the low-order modes, Exercise is more sensitive. The results also show that the gas rotational motion is the destabilizing factor of the liquid fracture for the asymmetric mode, both in the low-order mode and in the high-order mode. For the symmetric mode, the gas rotational motion is the stablizing factor of the low-order mode perturbation However, it is a strong destabilizing factor of high-order mode disturbances.