Effect of lobe-type rear variable area bypass injector on flow field characteristics in a variable cycle engine model afterburner under different modes

IF 6.1 2区工程技术 Q2 ENERGY & FUELS

Applied Thermal Engineering Pub Date : 2025-05-09 DOI:10.1016/j.applthermaleng.2025.126791

Zhijie He, Guanghai Liu, Yuying Liu

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引用次数: 0

Abstract

The influence of the rear variable area bypass injector (RVABI) on the flow field characteristics of the afterburner is crucial, particularly for combustion stability in a variable cycle engine (VCE), as both the bypass ratio and the flow pattern vary significantly under different modes. Herein, the evolution of vortex structure and the characteristics of the recirculation zone (RZ) are numerically investigated in a VCE afterburner configured with lobe-type RVABI, core-region stabilizer (CRS), and mixing-region stabilizer (MRS). The results show that in the three-bypass mode, the large-scale streamwise vortices induced by lobe-type RVABI split into pairs when interacting with MRS, and then the orthogonal vortices are formed, which leads to significant asymmetry in spanwise vortex structures and a shortened RZ shape. Compared with the CRS, the length and width of RZ behind MRS are reduced by up to 29.94% and 28.21%, accompanied by migration of the asymmetric spanwise vortex core. This phenomenon is attributed to the mass transport within RZ under the entrainment effect of streamwise vortices behind MRS. Moreover, in the two-bypass mode, the disturbances caused by RVABI to MRS and CRS are both weak, and the symmetric RZ shapes and stable spanwise vortices for both stabilizers are maintained, which is different from those in the three-bypass mode.

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叶状后置变面积旁通喷油器对变循环发动机加力燃烧室不同模式下流场特性的影响

后置变面积旁通喷油器（RVABI）对加力燃烧室流场特性的影响是至关重要的，特别是对于变循环发动机（VCE）的燃烧稳定性，因为在不同的模式下，旁通比和流型都有很大的变化。本文采用数值模拟的方法研究了采用叶型RVABI、核心区稳定器（CRS）和混合区稳定器（MRS）的VCE加力燃烧室涡结构的演变和再循环区（RZ）特性。结果表明：在三涵道模式下，叶型RVABI诱导的大尺度流向涡在与MRS相互作用时分裂成对，然后形成正交涡，导致展向涡结构明显不对称，RZ形状缩短；与CRS相比，MRS后RZ的长度和宽度分别减少了29.94%和28.21%，并伴有不对称展向涡核的迁移。这一现象是由于在MRS后的顺流涡夹带作用下，RZ内的质量输运造成的，而且在双旁路模式下，RVABI对MRS和CRS的扰动都较弱，保持了对称的RZ形状和稳定的两种稳定器的展向涡，这与三旁路模式不同。

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

Applied Thermal Engineering 工程技术-工程：机械

CiteScore

11.30

自引率

15.60%

发文量

1474

审稿时长

57 days

期刊介绍： Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.