Effect of axial and circumferential length of rotating detonation combustor on pressure and temperature of outlet flow field
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摘要: 为了研究旋转爆震燃烧室与涡轮的匹配特性，利用二维欧拉方程数值研究了基于当量H2/Air燃烧的旋转爆震燃烧室出口流场特性，对比分析了不同燃烧室轴向长度和周向长度出口总压脉动、总压畸变以及出口温度分布规律。结果表明：旋转爆震燃烧室在稳定工作状态下，其出口总压的脉动值会呈现周期性振荡；燃烧室尺度对发动机出口流场的不均匀性有很大影响，随着燃烧室轴向长度的增大或周向尺寸的减小，其出口总压脉动均值、畸变指数和出口温度分布系数均会减小，其出口流场均匀性提高。此外，爆震波高度随着周向尺寸的增大而增大；轴向尺寸对爆震波高度几乎不产生影响。Abstract: For a better characterization of the correlation between the rotating detonation combustion chamber and the turbine, the characteristics of the rotating detonation outlet's flow field with equivalent hydrogen-air mixture were investigated numerically based on two-dimensional compressible Euler equations. The mean value of the outlet's total pressure pulse, distortion index and temperature distribution factor were analyzed in connection with different axial lengths and radiuses of the combustion. The results show that the value of the outlet's total pressure fluctuates periodically when the rotating detonation combustion remains in a steady state. The size of the combustor has significant influence on the homogeneity of the outlet's flow field. With the increase of the axial length or the decrease of the circumferential dimension of the combustion, the mean value of the outlet's total pressure pulsation, the distortion index and the outlet temperature distribution coefficient all decrease, whereas the homogeneity of the outlet's flow field increases. In addition, the height of the detonation wave gets bigger as does the circumferential size but the axial length has little effect on the height of the detonation wave.
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图 6 不同周向长度RDC的温度云图
Figure 6. Temperature contours of RDC with different circumferential lengths
图 7 出口总压峰值和爆震波高度随轴向长度的变化
Figure 7. Variation of outlet's peak total pressure and detonation wave height with combustion axial length
图 8 出口总压峰值和爆震波高度随半径的变化
Figure 8. Variation of outlet's peak total pressure and detonation wave height with combustion radius
图 9 工况2下出口总压和总温沿周向位置的变化
Figure 9. Variation of outlet's total pressure and temperature along the circumferential position in case 2
图 10 出口总压脉动值随时间的变化规律
Figure 10. Variation of outlet's total pressure pulse value with time
图 11 出口畸变指数和脉动均值随燃烧室轴向长度的变化
Figure 11. Variation of outlet distortion index and pulsation mean with combustion axial length
图 12 出口畸变指数和脉动均值随燃烧室半径的变化
Figure 12. Variation of outlet distortion index and pulsation mean with combustion radius
图 13 出口温度分布系数、最大总温和平均总温随燃烧室轴向长度的变化
Figure 13. Variation of OTDF, maximum and average total temperature with combustion axial length
图 14 出口温度分布系数、最大总温和平均总温随半径的变化
Figure 14. Variation of OTDF, maximum and average total temperature with combustion radius
表 1 不同燃烧室尺度的计算工况
Table 1. Calculation conditions with different combustion scales
Case Size/(mm×mm) 1 314×75 2 314×100 3 314×125 4 314×150 5 188×50 6 251×50 7 314×50 8 377×50 
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