在蛇形微管中流动的超临界压力 RP-3 弯头的局部阻力特性

IF 5.4 2区 工程技术 Q1 ENGINEERING, AEROSPACE
Yanchen Fu , Yinlong Liu , Juan Wang , Yu Wang , Guoqiang Xu , Jie Wen
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引用次数: 0

摘要

根据航空发动机航空热防护对紧凑型热交换器和微冷却通道的需求,实验研究了超临界压力航空燃料 RP-3 在内径为 1.8 mm、质量通量为 1179 kg/(m-s) 的绝热水平蛇形管中流动时的弯头局部流阻特性。在热物性变化的基础上,分析了系统压力(/ = 1.72-2.58)和几何参数(包括弯管数(= 5-11)、弯管直径(/ = 16.7-27.8)和弯管距离(/ = 20-60))对弯管压降和局部阻力系数的影响。结果表明,在温度大于 0.85 的近伪临界温度区域,弯头压降的增加和局部阻力系数的减小都随温度的升高而加快。系统压力的增加可以抑制弯头局部压降的增加,而局部阻力系数受压力的影响较小。在直管内流动充分发展的前提下,当 / 大于 22.2 时,弯管直径对局部阻力系数的影响较小。此外,考虑到弯管直径和物理特性比,建立了片断经验相关性,以预测蛇形管的弯管压降,优化航空发动机冷却管系统的布局。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Local resistance characteristics of elbows for supercritical pressure RP-3 flowing in serpentine micro-tubes

Based on the demands of compact heat exchangers and micro cooling channels applied for aviation thermal protection on aero-engines, the elbow local flow resistance characteristics for supercritical pressure aviation fuel RP-3 flowing in adiabatic horizontal serpentine tubes with the inner diameter of 1.8 mm and the mass flux of 1179 kg/(m2·s) were experimentally studied. The long-short-tube method was used to obtain the elbow pressure drop from the total serpentine tube pressure drop, and the effects of system pressures (P/Pc = 1.72–2.58) and geometry parameters including bend numbers (n = 5–11), bend diameters (D/d = 16.7–27.8), and bend distances (L/d = 20–60) on elbow pressure drops and local resistance coefficients are analyzed on the basis of the thermal physical property variation. The results show that both the increase in the elbow pressure drop and the decrease in the local resistance coefficient with temperatures speed up at the near pseudo-critical temperature region of T > 0.85Tpc. And the growth of the elbow local pressure drop could be inhibited by the increase of system pressures, while the local resistance coefficient is slightly affected by pressures. The influence of bend diameters on the local resistance coefficient is mild when D/d is larger than 22.2 in the premise of fully developed flow in straight tubes. Furthermore, a piecewise empirical correlation considering the bend diameter and physical property ratio is developed to predict the elbow pressure drop of the serpentine tube and optimize the layout of the cooling tube system on aero-engines.

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来源期刊
CiteScore
7.50
自引率
5.70%
发文量
30
期刊介绍: Propulsion and Power Research is a peer reviewed scientific journal in English established in 2012. The Journals publishes high quality original research articles and general reviews in fundamental research aspects of aeronautics/astronautics propulsion and power engineering, including, but not limited to, system, fluid mechanics, heat transfer, combustion, vibration and acoustics, solid mechanics and dynamics, control and so on. The journal serves as a platform for academic exchange by experts, scholars and researchers in these fields.
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