二次元ラム加速器の着火管を用いた始動の数値計算

概要

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The ram accelerator is a device to accelerate a projectile up to hypervelocity in a tube filled with combustible gaseous mixtures. One of the most troublesome problems in operating the facility is a difficulty to start. In order to improve the ram accelerator system in Hiroshima University, direct numerical simulations are carried using finite difference methods. A projectile and an igniter move at speed of 1 200 m/s from an evacuated chamber into a ram acceleration tube, where hydrogen-oxygen-nitrogen gas mixtures are filled as combustible gases. When combustible gas mixtures are filled in the acceleration tube, any solution without detonation or quenching is not obtained. To solve this problem, we introduce a ignition tube between the evacuated chamber and the acceleration tube. In the ram acceleration tube undetonable but combustible gas mixtures are filled, while in the ignition tube detonable gases are used. As a result, a solution is obtained with a choking mode combustion when the boundary layer is taken into account.
一般社団法人日本機械学会の論文
1998-08-25