Heat and mass transfer mechanistic investigation of wall intervention on spray ignition characteristics under aviation piston engine-like conditions

IF 2.8 2区 工程技术 Q2 ENGINEERING, MECHANICAL Experimental Thermal and Fluid Science Pub Date : 2024-06-06 DOI:10.1016/j.expthermflusci.2024.111247
Dongfang Wang , Qiming Ouyang , Yikai Li , Jilin Lei , Yue Lou , Zhongjie Shi , Ziming Yang
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Abstract

The interaction between spray and walls significantly influences the mixture formation and ignition characteristics in aviation piston engines, primarily due to the dynamics of heat and mass transfer. To elucidate the wall’s influence on the impingement spray ignition process and reconcile discrepancies in the extant literature, we conducted a comprehensive suite of optical experiments encompassing free and impinging sprays with wide ambient temperature conditions (680 to 1200 K). Numerical simulations were utilized to dissect the flow field’s distribution patterns, as well as heat and mass transfer dynamics. Our investigation reveals that impinging sprays exhibit markedly shorter ignition delay times than free sprays under comparable conditions, with this divergence becoming more pronounced at lower ambient temperatures. Notably, impingement sprays are capable of auto-ignition at reduced ambient temperatures. The spray-wall interaction effect accelerates the accumulation of heat from the low-temperature reaction, facilitating swifter attainment of the threshold temperature for the high-temperature reaction. This is attributable to the generation of a higher quantity of high-temperature mixtures with a diminished local equivalence ratio. The disparity in the ignition delay times between impinging and free sprays is exacerbated by the elevated heat demand for the transition from low-temperature reaction to high-temperature reaction at lower ambient temperature conditions, predominantly driven by the exothermic nature of low-temperature reaction.

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在类似航空活塞发动机的条件下,壁面干预对喷雾点火特性的传热和传质机理研究
在航空活塞发动机中,喷雾和壁面之间的相互作用对混合气的形成和点火特性有很大影响,这主要是由于热量和质量的动态传递。为了阐明壁面对撞击喷雾点火过程的影响并协调现有文献中的差异,我们进行了一整套光学实验,包括自由喷雾和撞击喷雾,以及宽环境温度条件(680 至 1200 K)。我们利用数值模拟来剖析流场的分布模式以及传热和传质动力学。我们的研究发现,在可比条件下,撞击喷雾的点火延迟时间明显短于自由喷雾,而且在环境温度较低时,这种差异变得更加明显。值得注意的是,撞击喷雾能够在较低的环境温度下自动点火。喷壁相互作用效应加速了低温反应的热量积累,有利于更快地达到高温反应的临界温度。这是因为产生了更多的高温混合物,而这些混合物的局部等效比降低了。在较低的环境温度条件下,从低温反应过渡到高温反应所需的热量增加,加剧了撞击喷射和自由喷射之间点火延迟时间的差异。
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来源期刊
Experimental Thermal and Fluid Science
Experimental Thermal and Fluid Science 工程技术-工程:机械
CiteScore
6.70
自引率
3.10%
发文量
159
审稿时长
34 days
期刊介绍: Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.
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