Study on influencing factors of combustion characteristics for the nested helical grain [嵌套式螺旋药柱燃烧特性影响因素探究]

作者：Wang Z.; Zhang Z.; Lin X.^*; Li F.; Yu X.

来源：Journal of Solid Rocket Technology, 2022, 45(4): 506-511.

DOI：10.7673/j.issn.1006-2793.2022.04.003

• Characteristic velocity
• Combustion characteristic
• Hybrid rocket
• Regression rate

In order to further explore the influencing factors on combustion characteristics of the nested helical grain, the firing test was carried out. Using oxygen as the oxidizer with initial mass flux about 3.0 g/(cm2?s), the effects of the number of blades, blade rotation angle and the difference of basic regression rate on the combustion performance for the nested helical grain were compared and analyzed, mainly including regression rate and characteristic velocity. The test results show that moderately increasing the number of blades, the rotation angle of the blades, and the difference in the basic regression rate between the component fuels are all beneficial to improving the regression rate and characteristic velocity of the grains. However, due to the low regression rate and characteristic velocity of the ABS helical matrix, excessive increase of blade number will decrease the overall combustion performance of the grain. Meanwhile, affected by the blade-guided swirl strength, rotation angle of the blade has an optimal value for improving regression rate of the grain. Increasing the difference of the basic regression rate between the fuel components of the nested helical grains can help the formation of the characteristic helical structure, further increasing the characteristic velocity. In addition, the regression rate of the nested helical grains filled with pure paraffin fuel is not improved, possibly because ABS blades inhibit the entrainment of paraffin droplets.

• 单位
  高温气体动力学国家重点实验室; 中国科学院大学