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<p>Minimizing frictional forces due to jamming between critical components such as shutters and nozzle necks is essential for ensuring the reliability of solid-propellant thrusters. This study presents innovative Rod-type and Slot-pin nozzle neck designs, incorporating rolling-structure concepts and high-temperature-resistant materials to effectively reduce friction in extreme operational conditions. The Slot-pin design, in particular, integrates a deformation-absorbing mechanism that accommodates initial interference, further mitigating frictional forces. Experimental results demonstrate that both designs significantly decrease friction compared to conventional configurations, with the Slot-pin design achieving superior performance at low interference distances. Finite Element Method (FEM) structural analyses corroborate these findings, highlighting each design’s capacity to prevent jamming-induced mechanical failures. This research provides critical insights into friction reduction and deformation-absorbing strategies for high-stress aerospace components, establishing a robust framework for enhanced durability and performance.</p>

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Development and validation of heat resistant rolling and deformation absorbing nozzle necks for friction and reaction force reduction

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月14日

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  • Yeon-Gwan Lee,
  • Min-Su Jang

摘要

Minimizing frictional forces due to jamming between critical components such as shutters and nozzle necks is essential for ensuring the reliability of solid-propellant thrusters. This study presents innovative Rod-type and Slot-pin nozzle neck designs, incorporating rolling-structure concepts and high-temperature-resistant materials to effectively reduce friction in extreme operational conditions. The Slot-pin design, in particular, integrates a deformation-absorbing mechanism that accommodates initial interference, further mitigating frictional forces. Experimental results demonstrate that both designs significantly decrease friction compared to conventional configurations, with the Slot-pin design achieving superior performance at low interference distances. Finite Element Method (FEM) structural analyses corroborate these findings, highlighting each design’s capacity to prevent jamming-induced mechanical failures. This research provides critical insights into friction reduction and deformation-absorbing strategies for high-stress aerospace components, establishing a robust framework for enhanced durability and performance.