Experimental and numerical investigations into cold flow characteristics of multiple micro-mixing jets for hydrogen-rich gas turbines

IF 5 1区工程技术 Q1 ENGINEERING, AEROSPACE Aerospace Science and Technology Pub Date : 2024-10-31 DOI:10.1016/j.ast.2024.109702

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Abstract

To explore the flow field of micro-mixing jets, cold flow characteristics of a model Micromix burner were investigated by particle image velocimetry (PIV) system and Large-eddy simulation (LES) model. Results show that LES results are in good agreement with experimental results. In the flow field of multiple micro-mixing jets, the jet velocities of nozzles farther away from the burner center have a high increase and decay rate. When the outlet Reynolds number increases, the Reynolds stress increases first and then decreases in the merging region indicating that the velocity fluctuation disappears in the second jet half, but it has little effect on the flow field structure. Comparing the flow fields of round multiple micro-mixing jets, the merging point and combined point in the elliptical jets flow field move backward. Moreover, the maximum velocity for elliptical jets is also faster than the round jets, which is caused by the high turbulent kinetic energy in the elliptical jet flow field. When the tube spacing increases from 2 to 3 times the tube diameter, positions of the two feature points change linearly. Further, the surrounding jets can decrease the velocity attenuation of the center nozzle and elongate the axial length of the two feature regions.

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富氢燃气轮机多重微混合喷流冷流特性的实验和数值研究

为了探索微混合射流的流场，我们利用粒子图像测速仪（PIV）系统和大涡流模拟（LES）模型研究了模型 Micromix 燃烧器的冷流特性。结果表明，LES 结果与实验结果非常吻合。在多个微混合射流的流场中，距离燃烧器中心较远的喷嘴的射流速度具有较高的上升率和衰减率。当出口雷诺数增大时，雷诺应力在合并区域先增大后减小，表明速度波动在后半段射流中消失，但对流场结构影响不大。比较圆形多重微混合射流的流场，椭圆形射流流场中的合并点和结合点向后移动。此外，椭圆形射流的最大速度也比圆形射流快，这是因为椭圆形射流流场中的湍流动能较高。当管道间距从管道直径的 2 倍增加到 3 倍时，两个特征点的位置呈线性变化。此外，周围的射流可降低中心喷嘴的速度衰减，并拉长两个特征区域的轴向长度。

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来源期刊

Aerospace Science and Technology 工程技术-工程：宇航

CiteScore

10.30

自引率

28.60%

发文量

654

审稿时长

54 days

期刊介绍： Aerospace Science and Technology publishes articles of outstanding scientific quality. Each article is reviewed by two referees. The journal welcomes papers from a wide range of countries. This journal publishes original papers, review articles and short communications related to all fields of aerospace research, fundamental and applied, potential applications of which are clearly related to: • The design and the manufacture of aircraft, helicopters, missiles, launchers and satellites • The control of their environment • The study of various systems they are involved in, as supports or as targets. Authors are invited to submit papers on new advances in the following topics to aerospace applications: • Fluid dynamics • Energetics and propulsion • Materials and structures • Flight mechanics • Navigation, guidance and control • Acoustics • Optics • Electromagnetism and radar • Signal and image processing • Information processing • Data fusion • Decision aid • Human behaviour • Robotics and intelligent systems • Complex system engineering. Etc.