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利用二维可压缩欧拉方程数值研究了当量氢气/空气在连续旋转爆轰燃烧室(CRDC)中的流场情况,主要考查了不同CRDC周向尺寸下燃料入流总压对增压比、燃烧效率、容积热负荷及其NOx排放等性能的影响.结果表明:当CRDC周向尺寸为150mm时,随着燃料入流总压的提高,增压比基本保持不变,燃烧效率和容积热负荷均呈线性增长;当CRDC周向尺寸为250mm时,随燃料入流总压的提高,爆轰波头数加倍,容积热负荷仍呈线性增长,但是增压比及燃烧效率均出现转折性下降.与传统的等压燃烧室相比,CRDC具有更高的性能.当计算域为250mm×40mm时,增压比高达2.706,大大提高了燃气的做功能力;容积热负荷达到2.18×1010 W/m3;而NOx排放质量浓度为0.692mg/m3,保证了低排放的要求.
The two-dimensional compressible Euler equation was used to study the flow field of hydrogen / air in a continuous rotary detonation combustor (CRDC). The effects of total fuel inflow pressure, pressure ratio, Efficiency, volumetric heat load and its NOx emission.The results show that when the circumferential size of CRDC is 150mm, the supercharging pressure ratio remains basically unchanged with the increase of the total fuel inflow pressure, and both combustion efficiency and volumetric heat load When the circumferential size of CRDC is 250mm, the total heat input increases with the increase of the total pressure of the inflow, the number of detonation waves doubles, and the volumetric heat load still increases linearly, but the turbocharged ratio and the combustion efficiency all show a turning decline. Compared with traditional isobaric combustion chamber, CRDC has higher performance.When the computational domain is 250mm × 40mm, the supercharging ratio is as high as 2.706, which greatly improves the workability of gas and the volume heat load reaches 2.18 × 1010 W / m3 ; And the mass concentration of NOx emission is 0.692mg / m3, which ensures low emission requirements.