Two-dimensional axisymmetric large eddy simulation was conducted to model the sheet formation and primary breakup of gelled kerosene and gelled hydrogen peroxide in a pintle injector. This was done by varying the pintle opening distance. To simulate a hollow conical gelled hydrogen peroxide sheet from the center gap and the sheet breakup by the gelled kerosene from the annular gap, volume of fluid (VOF) simulation was employed. Here, the viscosity was considered as a function of the shear rate. The power law expression for hydrogen peroxide and the Herschel-Bulkley extended expression for kerosene were used as the user-defined function codes. The variations of the breakup length, wavelength, and the amplitude of the formed sheet due to disturbance waves using VOF simulation with varied pintle opening distances were studied. The viscosity distributions due to the shear rate of the gel flow and the velocity at the exit of the injector were plotted to investigate the gel flow behavior.

中文翻译：

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可变注射面积的针状射流中板料形成的流体模拟量和非牛顿推进剂的初次破裂

进行了二维轴对称大涡模拟，以模拟针状注射器中片状胶凝煤油和胶凝过氧化氢的形成和初次破裂。这是通过改变枢轴打开距离来完成的。为了从中心间隙模拟空心锥形胶凝过氧化氢片，并从环形间隙模拟胶凝煤油使片破裂，采用了流体体积（VOF）模拟。在此，粘度被认为是剪切速率的函数。用户定义的功能代码使用了过氧化氢的幂律表达式和煤油的Herschel-Bulkley扩展表达式。利用VOF模拟研究了在不同的枢轴开口距离情况下，扰动波引起的破碎长度，波长和振幅的变化。