Investigation on the integrated characteristics of n-decane/air rotating detonation combustor and supersonic turbine

IF 5.1 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress Pub Date : 2024-11-06 DOI:10.1016/j.tsep.2024.103040

Wei Zhang, Ningbo Zhao, Xiaofeng Shao, Hongtao Zheng

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Abstract

In this study, the two-dimensional numerical simulations are conducted to study the flow field characteristics, turbine performance and loss mechanism of integrated system of rotating detonation combustor and supersonic turbine under two different directions of detonation wave propagation. The results indicate that the propagation direction of RDW affects the incident angle between OSW and guide vanes, resulting in different operating modes for aligned and unaligned modes. OSW in the turbine cascade undergoes the leading-edge shock, blade surface reflection and trailing edge diffraction. The backward-propagating rake-type shock envelope is formed due to leading-edge shock of the rotor. In misaligned mode, the stator has higher damping of both pressure and temperature. The stator significantly improves the circumferential uniformity of both velocity and pressure, particularly when operating in aligned mode. The total pressure loss in aligned mode is less, therefore the turbine achieves higher rim work and efficiency. The viscosity is one of the main sources of loss in the flow field. The reflected shock waves at the leading edge of the rotor and in the stator cascade are the primary factors contributing to the leading-edge vortices on the stator vanes.

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正癸烷/空气旋转爆燃燃烧器和超音速涡轮机综合特性研究

本研究通过二维数值模拟，研究了两种不同爆轰波传播方向下旋转爆轰燃烧器和超音速涡轮集成系统的流场特性、涡轮性能和损耗机理。结果表明，爆轰波的传播方向会影响OSW和导叶之间的入射角，从而导致对准和非对准模式的不同运行模式。OSW在涡轮级联中经历了前缘冲击、叶片表面反射和后缘衍射。由于转子的前缘冲击，形成了向后传播的耙型冲击包络。在不对中模式下，定子对压力和温度都有较高的阻尼作用。定子极大地改善了速度和压力的圆周均匀性，尤其是在对齐模式下运行时。对齐模式下的总压力损失较小，因此涡轮机能获得更高的轮缘功和效率。粘度是流场损失的主要来源之一。转子前缘和定子级联中的反射冲击波是造成定子叶片前缘涡流的主要因素。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Thermal Science and Engineering Progress Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

7.20

自引率

10.40%

发文量

327

审稿时长

41 days

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