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Injector Flow Characteristics for Gel Propellants

机译：凝胶推进剂的喷射器流动特性

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Computational and experimental efforts to investigate the injector flow characteristics for gel propellants are presented. Two different types of injectors are considered: a tapered tube and plain-orifice type. Paraffin/Thixatrol and Water/HPC Gels are used as working fluids and are modeled as a shear-thinning fluid. Flows are characterized by a time-averaged discharge coefficient, viscosity at the exit, and velocity and viscosity profiles at the exit for various injector geometries. Factors in a parametric study include convergence angle in a tapered tube injector, orifice length-to-diameter ratio, and chamfer length in a plain-orifice injector. According to a parametric study, hydraulic resistance increases by increasing the convergence angle in a tapered tube injector and orifice L/D ratio in a plain-orifice injector. It is found that the discharge coefficient and viscosity at the exit are reduced under these conditions. The effect of chamfer length on steady injector flows are negligible in a plain-orifice injector.
机译：提出了用于研究凝胶推进剂喷射器流动特性的计算和实验方法。考虑了两种不同类型的喷油器：锥形管和普通孔口类型。石蜡/硫杂醇和水/ HPC凝胶被用作工作流体，并被建模为剪切稀化流体。流量的特征在于时间平均的排放系数，出口处的粘度以及各种喷射器几何形状的出口处的速度和粘度曲线。参数研究的因素包括锥形管进样器的会聚角，孔口长度与直径之比以及平孔口进样器的倒角长度。根据一项参数研究，通过增加锥形管喷油器的会聚角和平孔喷油器的孔L / D比，液压阻力会增加。发现在这些条件下出口的排出系数和粘度降低。在平孔喷射器中，倒角长度对稳定喷射器流量的影响可以忽略不计。

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