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Regression rate characteristics of hybrid rocket motor with helical grain

机译：螺旋纹混合动力火箭发动机的回归速率特性

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This paper concentrates on the fuel regression rate characteristics of hybrid rocket motor with helical grain and attempts to overcome the low regression rate shortcoming of conventional hybrid rocket motor. Both three-dimensional numerical simulations and lab-scale firing tests are conducted to analyze the regression behavior of solid helical fuel grain. Gaseous oxygen and polyethylene are utilized as the propellants. Head axial injection method and Laval nozzle are adopted in the motor. A steady numerical model based on pure-gas-phase reaction assumption is established. Flow field characteristics of the hybrid rocket motor with helical grain are identified through three-dimensional numerical simulations. Simulation results show that the helical structure can both increase turbulence kinetic energy and swirl number in the flow field. These two factors both contribute to the increase of the fuel regression rate. Geometric factors influencing the fuel regression rate are thread pitch, groove depth and groove width. Experimental results reveal that the fuel regression rate increases with the increase of the groove depth and the groove width. The thread pitch can also obviously influence the regression behavior of the helical grain. Overall, the helical grain can effectively increase the fuel regression rate of hybrid rocket motor. (C) 2017 Elsevier Masson SAS. All rights reserved.
机译：本文着重研究具有螺旋纹的混合动力火箭发动机的燃料回归率特性，并试图克服常规混合动力火箭发动机的低回归率缺点。进行了三维数值模拟和实验室规模的燃烧试验，以分析固体螺旋燃料颗粒的回归行为。气态氧气和聚乙烯被用作推进剂。电机采用头部轴向喷射方式和拉瓦尔喷嘴。建立了基于纯气相反应假设的稳态数值模型。通过三维数值模拟，确定了带螺旋纹混合动力火箭发动机的流场特性。仿真结果表明，螺旋结构既可以增加湍流动能，又可以增加流场中的旋流数。这两个因素都有助于增加燃料的回归率。影响燃料回归率的几何因素是螺距，凹槽深度和凹槽宽度。实验结果表明，随着槽深和槽宽的增加，燃料的回弹率增加。螺距显然也会影响螺旋纹的回归行为。总的来说，螺旋纹可以有效地提高混合动力火箭发动机的燃料回归率。 （C）2017 Elsevier Masson SAS。版权所有。

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