连续旋转爆轰波在无内柱圆筒内的数值模拟

在对同轴圆管内的连续旋转爆轰的已有研究成果进行总结分析后,提出无内柱的连续旋转爆轰的燃烧室模型.利用结合了一步化学反应模型的圆柱坐标系下的Euler方程三维数值模拟了在这种燃烧室内爆轰波的传播行为.数值结果表明:爆轰波由初始起爆的单向传播最终自动收敛稳定到若干个典型爆轰波头的流场结构.在当前进气条件下,流量可以达到450kg/m2s,其基于反应物的比冲约为1900s.与同以H₂/Air作为燃料时同轴连续旋转爆轰发动机(RDE)燃烧室模型的2000s相比,基于反应物的比冲十分接近,但由于内部有可燃气以爆燃形式燃烧等原因,有5%的损失. 

3-D simulation of rotating detonation wave in combustion chambers without inner wall

Based on summary and analysis of existing results and conclusions on rotating detonation wave in annular combustion chambers, an alternative model of chamber for rotating detonation engines was presented. It has no inner wall. We utilized one step chemistry kinetic model together with the Eular function in three-dimensional space to testify the possibility of continuous rotation. The simulation showing that the detonation spontaneously converged to a propagation structure of two central symmetric detonation waves. Under the present condition, the mass flow could reach as large as 450kg/m²s and the fuel-based impulse was 1900s, which is 5 percent lower than that in the annular combustion chamber.