Numerical Study of the Ejection Cooling Mechanism of Ventilation for a Marine Gas Turbine Enclosure

IF 2 3区工程技术 Q2 ENGINEERING, MARINE Polish Maritime Research Pub Date : 2022-09-01 DOI:10.2478/pomr-2022-0032

Hong Shi, Qianwei Zhang, M. Liu, Kaijie Yang, Jie Yuan

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引用次数: 2

Abstract

Abstract A marine gas turbine enclosure must be designed to prevent overheating of the electrical and engine control components as well as diluting potential fuel leaks. In order to achieve an optimal enclosure design, a numerical study of the ventilation-ejection cooling mechanism of a gas turbine enclosure is carried out in this paper. The evaluation index of the ejection cooling performance is first proposed and the algorithm of numerical simulation is verified. On this basis, orthogonal combinations of structural parameters are carried out for the expansion angle α of the lobed nozzle and the spacing S between the outlet plane of the lobed nozzle and the inlet plane of the mixing tube. The flow and the temperature distribution inside the enclosure are analysed under different operating conditions. The results show that the influence of the lobed nozzle expansion angle α and the spacing S on the performance is not a single-valued function but the two influencing factors are mutually constrained and influenced by each other. For any spacing, the combined coefficient is optimal for the expansion angle α = 30°. When the expansion angle α = 45° and the spacing S = 100 mm, the combined coefficient and the temperature distribution inside the enclosure are optimal at the same time.

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船用燃气轮机机壳通风喷射冷却机理的数值研究

船用燃气轮机外壳必须设计成防止电气和发动机控制部件过热以及稀释潜在的燃料泄漏。为了实现燃气轮机机壳的优化设计，本文对某型燃气轮机机壳的通风-喷射冷却机理进行了数值研究。首次提出了喷射冷却性能的评价指标，并对数值模拟算法进行了验证。在此基础上，对叶状喷嘴的膨胀角α和叶状喷嘴出口平面与混合管进口平面的间距S进行了结构参数的正交组合。分析了不同工况下箱体内的流量和温度分布。结果表明，叶状喷管膨胀角α和间距S对性能的影响不是单值函数，而是相互制约、相互影响的。对于任意间距，当膨胀角α = 30°时，复合系数最优。当膨胀角α = 45°，膨胀间距S = 100 mm时，复合系数与箱体内温度分布同时最佳。

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来源期刊

Polish Maritime Research 工程技术-工程：海洋

CiteScore

3.70

自引率

45.00%

发文量

审稿时长

>12 weeks

期刊介绍： The scope of the journal covers selected issues related to all phases of product lifecycle and corresponding technologies for offshore floating and fixed structures and their components. All researchers are invited to submit their original papers for peer review and publications related to methods of the design; production and manufacturing; maintenance and operational processes of such technical items as: all types of vessels and their equipment, fixed and floating offshore units and their components, autonomous underwater vehicle (AUV) and remotely operated vehicle (ROV). We welcome submissions from these fields in the following technical topics: ship hydrodynamics: buoyancy and stability; ship resistance and propulsion, etc., structural integrity of ship and offshore unit structures: materials; welding; fatigue and fracture, etc., marine equipment: ship and offshore unit power plants: overboarding equipment; etc.