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Many of the upper stages of the liquid rockets are configured with bi-propellant/mono-propellant thrusters for Attitude and Orbit Control System (AOCS). Majority of the propellant feed system of the rocket stage is designed for main engine of the rocket. Hence, AOCS thrusters may need to be operated at off-design conditions or in multiple different environments in various missions. Considering today’s scenario and number of space launch, experimental evaluations of the AOCS thrusters for every mission is not possible. So, in this work a numerical method is developed to evaluate performance of the bi-propellant thruster at off-design conditions and validated numerical model by conducting hot test on the bi-propellant thruster at LPSC/ISRO. Experimental test on bi-propellant thruster was conducted in vacuum condition. Variations in major parameters like chamber pressure, mixture ratio and characteristic velocity (C*) are analysed and summarized in this paper.

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Off-Design Testing of Bi-propellant Rocket Thruster and Development of Numerical Method to Predict Combustion Parameters

  • 会议论文

  • 发表日期：

    2026年

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  • Dhavalkumar Paghdar,
  • Anurag Butola,
  • K. M. Muhammed Rafi

摘要

Many of the upper stages of the liquid rockets are configured with bi-propellant/mono-propellant thrusters for Attitude and Orbit Control System (AOCS). Majority of the propellant feed system of the rocket stage is designed for main engine of the rocket. Hence, AOCS thrusters may need to be operated at off-design conditions or in multiple different environments in various missions. Considering today’s scenario and number of space launch, experimental evaluations of the AOCS thrusters for every mission is not possible. So, in this work a numerical method is developed to evaluate performance of the bi-propellant thruster at off-design conditions and validated numerical model by conducting hot test on the bi-propellant thruster at LPSC/ISRO. Experimental test on bi-propellant thruster was conducted in vacuum condition. Variations in major parameters like chamber pressure, mixture ratio and characteristic velocity (C*) are analysed and summarized in this paper.