Dynamic Simulation of Reusable Rocket Aerodynamics Turning 0-to-180 Degrees

What is it about?

To reuse the rocket, JAXA is considering a return flight method in which the rocket re-enters with nose pointing to the ground, then turns 180 degrees and lands in the same attitude at launch. This flight method can save the propellant required for landing. Since conventional expandable rockets have never been experienced a 180-degree turnover, CFD analysis was conducted. In particular, this study compares a static analysis of various angles of attack at a zero turning speed with a dynamic analysis in which the angle of attack is changed continuously to investigate the aerodynamic effects of the turnover. The results showed that hysteresis of the air flow exists during the turnover, i.e., the flow field at one time affects the flow field at subsequent times.

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