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Journal of Zhejiang University SCIENCE A
ISSN 1673-565X(Print), 1862-1775(Online), Monthly
2022 Vol.23 No.5 P.415-420
Influence of momentum ratio control mode on spray and combustion characteristics of a LOX/LCH4 pintle injector
Abstract: The test piece is shown in Fig. 1. The simulation domain is the area of the test piece within red lines, and the area was meshed as shown in Fig. 2. One part where pintle extends into the combustion chamber is complicated and was divided by non-structural grids with axial length of 48 mm. The other part of the combustion chamber, including the nozzle, has a regular structure and was divided by structural grids with axial length of 425 mm. The x coordinate represents axial length, the y coordinate represents height, and the z coordinate represents width. Holes near the observation windows on both sides of combustion chamber are used to inject normal temperature nitrogen to prevent the observation windows from bursting, and to establish the desired combustion chamber pressure quickly.
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机构：国防科技大学，空天科学学院，高超声速冲压发动机技术重点实验室，中国长沙，410073
目的：目前对液氧/液甲烷针栓式喷注器燃烧特性的研究还有限。本文旨在通过数值模拟对不同动量比调节方式下的液氧/液甲烷针栓式喷注器的喷雾燃烧特性进行研究，以期为后期试验提供参考。
创新点：通过变化喷注压降改变喷注动量，得出了不同动量比调节方式下液氧/液甲烷针栓式喷注器燃烧室内甲烷与氧气浓度分布特点、温度分布特点、燃烧室压力分布特点、针栓头部液甲烷索泰尔平均粒径变化趋势以及燃烧室头部涡结构特征，可为液氧/液甲烷针栓式喷注器在变工况条件下的工程应用提供参考。
方法：1.通过理论计算，得到液氧/液甲烷撞击过程中的一次破碎粒径，并将其作为数值模拟中的初始喷注粒径；2.通过数值模拟，运用计算流体动力学后处理模块得到各目标参数的分布特征。
结论：1.高总动量比（TMR）条件下的推进剂撞击动量强，混合良好，有助于提高整体燃烧效率；与TMR=0.62相比，TMR=1.37条件下的LCH4蒸发更快，能够更快参与化学燃烧，且针栓头部的富燃区域较小。2.两种推进剂充分混合的接触面最先开始出现燃烧高温并形成火焰；随着混合过程的加强，火焰表面积增加，形成明显的弧形剪切火焰。3.针栓喷注器的喷雾结构呈三维空间分布，有利于能量快速扩散，因此燃烧稳定性较好。4.涡通过延长气相混合时间稳定火焰，可有效防止高温对燃烧室头部与针栓头部的烧蚀。
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DOI:
10.1631/jzus.A2100402
CLC number:
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On-line Access:
2024-08-27
Received:
2023-10-17
Revision Accepted:
2024-05-08
Crosschecked:
2022-05-23