Numerical simulation study of flow induced nutation instability in spinning solid propellant rocket
- Paper number
IAC-06-C1.1.09
- Author
Mr. Weiping Zhang, China Academy of Space Technology (CAST), China
- Year
2006
- Abstract
Abstract In order to improve the attitude stability of rocket, a spin-stabilized upper stage solid motor is adopted as a propulsive system. KT-1 series rocket consists of four stages solid rocket motor.The fourth-stage motor other than three of them has no control device.The KT-1 series of spin stabilized upper stage vehicles have exhibited an unexpected nutation instability appearing during operation from the telemetry data.Nutation degrades performance of spin-stabilized solid rocket motors used to raise satellite to expected orbit.The unexpected nutation motion of the fourth stage motor induces abortion of the KT-1 system.Conventional theories of spinning rocket dynamic failed to explain this behavior, but an agreement that the interaction of internal flow fields and nutation motion induced nutation instability of KT-1 series rocket is made by engineering researcher. So it is necessary to study the potential origins of the system.In this paper,numerical simulation study was carried out on different initial spinning frequency and nutation angle,applicating a validated numerical code. The paper include four main aspects:(1)develop CFD code of moving wall boundary conditions;(2)research in two methods of rigid rotating adopting method;(3)simulation study simplified model of motor combining CFD code, dynamic mesh and UDF program;(4)modeling full scale motor with slots grain on various operating conditions including initial spin frequency and nutation angle. Critical internal flow fields parameters was obtained by means of numerical simulation.Lateral momentum that may increase nutation motion can be obtained by ways of pressure integration.A calculation of Regain Coefficient effecting nutation instability was carried out.The numerical result was vilidated by comparing with analytical expression1.Some conclusions and suggestions that may find out the potential origins of abortion were gaven.On the other hand the improvable proposal was put up to improve the attitude dynamics instability of KT-1 rocket system.The results of our study will also be used in theory and experiment research of other spin-stabilized rocket vehicles.
- Abstract document