Investigation of rotating detonation combustor operation with H2-Air mixtures
Investigation of rotating detonation combustor operation with H2-Air mixtures
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DOI：
10.1016/j.ijhydene.2015.11.041
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发表时间：
2016-01
影响因子：
7.2
通讯作者：
V. Anand;A. S. George;R. Driscoll;E. Gutmark
中科院分区：
文献类型：
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作者：
V. Anand;A. S. George;R. Driscoll;E. Gutmark
对旋转爆轰燃烧室（RDC）在三种燃油喷射方案和两种空气喷射方案下的工作范围和波速性能进行了表征。通过改变喷油孔的总数和单个喷油孔的面积来改变喷油方案，同时在三种方案中保持相同的燃油质量通量。此外，还对加装背压收敛喷管后的可操作性、性能和燃烧引起的压力上升进行了分析。虽然工作范围在很大程度上不受喷油器孔长径比变化的影响，但长径比越高，过渡RDC工作次数越少，在这种情况下，连续传播的爆震波一旦在燃烧室内建立起来，就会突然减弱。增加的空气注入面积降低了可操作性，同时在RDC的性能中产生高随机性。燃料孔的长径比对爆轰波的数量有重要的影响。对于燃料孔的最大长径比，在最高的空气流速下，RDC在腔室内支持多个爆震波。在没有会聚喷嘴的情况下，所有三种燃油喷射方案都能达到80%的Chapman-Jouguet （C-J）爆速。通过喷管对RDC进行背压，可在环空获得C-J的爆震波速度。反应物填充高度与爆轰池宽度之比在贫和富工况下逐渐减小，在1.2左右达到峰值。在RDC中产生的爆轰静压上升取决于空气流量和反应物的当量比。
The operating range and wave speed performance of a Rotating Detonation Combustor (RDC) is characterized for hydrogen-air mixtures for three fuel injection schemes and two air injection schemes. The fuel injection scheme is altered by changing the total number of injection orifices and the individual orifice area, while maintaining the same fuel mass flux across the three schemes. The operability, performance and combustion-induced pressure rise due to the addition of a back-pressurizing convergent nozzle is also characterized. While the operating range is largely unaffected by changes in the length-to-diameter ratio of the fuel injector orifices, higher length-to-diameter ratios correspond to a lower number of transitional RDC operation where there is a sudden abatement of the continuously propagating detonation wave, once established inside the combustor. Increased air injection area diminishes the operability, while producing high stochasticity in the performance of the RDC. The length-to-diameter ratio of the fuel orifices has a significant impact on the number of detonation waves that can exist in the chamber. For the highest length-to-diameter ratio of the fuel orifices, and at the highest air flow rates, the RDC supports multiple detonation waves inside the chamber. Without the convergent nozzle attachment, 80% of Chapman–Jouguet (C–J) detonation speed is achieved for all three fuel injection schemes. C–J detonation wave speed is achieved in the annulus when the RDC is back-pressurized using the nozzle. The ratio of reactant fill-height to the detonation cell-width tapers at the lean and rich operating conditions, while peaking at an equivalence ratio of around 1.2. The detonation-induced static pressure rise produced in the RDC is found to be dependent on the air flow rate and the equivalence ratio of the reactants.