A Phenomenological Thermal Spray Wall Interaction Modeling Framework Applied to A High Temperature Ignition Assistant Device

S. K. Oruganti, Roberto Torelli, Kenneth Kim, Eric Mayhew, Chol-Bum M. Kweon
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Abstract

Airborne compression ignition engines must operate with reliable ignition systems to achieve proper ignition at every cycle, particularly at high altitudes. Glow-plug-based ignition assistant (IA) devices can provide the necessary energy to preheat the fuel and ensure ignitability of the fuel-air mixture. Ignitability of liquid sprays can be facilitated via direct impingement onto the hot IA surface; however, this comes with adverse effects on the IA durability. Therefore, optimizing an IA's design requires detailed understanding of the physics of fuel spray impingement of superheated surfaces. To this end, this work aims to formulate a new phenomenological thermal spray-wall interaction framework for modeling the film boiling-induced heat transfer, atomization, and dispersion of fuel spray droplets impinging onto a superheated IA device. A qualitative comparison of the new phenomenological model is performed against optical experiments from the literature of an F-24 fuel spray injected onto an IA device located 12 mm away from the injector tip. The temperature of the IA was set at 1400 K. The fuel injection pressure was 400 bar, while the ambient gas pressure and temperature were 30 bar and 800 K, respectively. The performance of the phenomenological model is evaluated in comparison with two other state-of-art models from the literature. A qualitative analysis of the different spray and fuel-air mixture characteristics is performed to outline the differences in the predictions offered by the new phenomenological model and the two state-of-art spray-wall interaction models.
应用于高温点火辅助装置的现象学热喷涂壁相互作用建模框架
机载压燃发动机必须配备可靠的点火系统,才能在每个循环中实现正确点火,尤其是在高海拔地区。基于火花塞的点火辅助(IA)装置可提供预热燃料所需的能量,并确保燃料-空气混合物的可燃性。液体喷雾的可燃性可通过直接撞击到热的辅助点火装置表面来实现;但这会对辅助点火装置的耐用性产生不利影响。因此,要优化 IA 的设计,就必须详细了解燃料喷雾撞击过热表面的物理学原理。为此,这项工作旨在制定一个新的现象学热喷射-壁相互作用框架,用于模拟薄膜沸腾引起的热传导、雾化以及燃料喷射液滴撞击过热内燃机设备的分散。新的现象学模型与文献中的光学实验进行了定性比较,实验中,F-24 燃料喷射到距离喷射器顶端 12 毫米的 IA 设备上。IA 的温度设定为 1400 K。燃料喷射压力为 400 巴,环境气体压力和温度分别为 30 巴和 800 K。通过与文献中另外两个最新模型的比较,对现象模型的性能进行了评估。对不同的喷射和燃料-空气混合物特性进行了定性分析,以概述新的现象学模型和两种最先进的喷壁相互作用模型在预测结果上的差异。
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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