Influence of propellant filling ratio for liquid rocket cold ejection on rocket launch accuracy

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (6) : 313-324.

WANG Jinghui1， JIANG Yi1， YANG Changzhi2, WEI Dongdong2

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Abstract

In order to study the effects of liquid propellant sloshing with different liquid filling ratios on rocket launch accuracy under cold ejection load, the liquid rocket with cold ejection is studied in this paper. The dynamic response of propellant sloshing is studied by fluid-solid coupling technique based on MPS method. Finally, the interference on rocket tank and influence on initial disturbance of rocket and mechanical characteristics of adaptor at different propellant liquid filling ratio are obtained. The results show that the larger the liquid filling ratio is, the greater the force of liquid propellant on a single tank is; In a certain range, with the increase of the filling ratio, the propellant sloshing makes the off-orbit pitch and yaw angular velocity of the rocket increase first and then decrease; When the liquid filling ratio is 80%, the initial disturbance of the rocket and the force of the adapter are worse. Propellant sloshing can not be ignored in the dynamics study of liquid rocket cold ejection.

Key words

liquid rocket / propellant sloshing / liquid filling ratios / fluid-structure coupling

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WANG Jinghui1， JIANG Yi1， YANG Changzhi2, WEI Dongdong2. Influence of propellant filling ratio for liquid rocket cold ejection on rocket launch accuracy[J]. Journal of Vibration and Shock, 2023, 42(6): 313-324

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