RP-2液滴爆轰与激波破碎特性

IF 1.7 4区 工程技术 Q3 MECHANICS
S. Salauddin, A. J. Morales, R. Hytovick, R. Burke, V. Malik, J. Patten, S. Schroeder, K. A. Ahmed
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引用次数: 0

摘要

研究了液体火箭推进剂2 (RP-2)液滴在激波管内的变形与破碎特性。通过对RP-2液滴进行弱激波、强激波和爆震波的实验,推导高速和超声速反应流对液滴变形和破碎的影响。高速影成像和纹影成像技术被用来表征液滴的形态、变形速率和液滴质心的位移。结果表明,从激波到爆轰的过渡抑制了液滴的变形,增加了小尺度的破裂。主要破裂机制的转变与韦伯数的显著增加有关,这是由于过渡到爆轰情况时流速和温度的增加。将实验数据与液滴稳定性分析相结合,预测每个测试条件下的“子”液滴(或初始“母”液滴的碎片)大小。随着流态向爆轰过渡,子液滴尺寸减小。分析质量剥离模型还确定,当接近超音速反应条件时,从母液滴剥离的总质量增加。在超声速反应流中,子液滴的大小和质量剥离速率将最终影响蒸发时间尺度和点火,这对基于爆轰的推进和动力系统的发展具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Detonation and shock-induced breakup characteristics of RP-2 liquid droplets

Detonation and shock-induced breakup characteristics of RP-2 liquid droplets

The deformation and breakup characteristics of liquid rocket propellant 2 (RP-2) droplets are experimentally investigated in a shock tube. The RP-2 droplets are subjected to a weak shock wave, a strong shock, and a detonation wave to deduce the impacts of high-speed and supersonic reacting flows on droplet deformation and breakup. High-speed shadowgraph and schlieren imaging techniques are employed to characterize droplet morphologies, deformation rates, and displacement of the droplet centroid. The results reveal that the transition from a shock wave to a detonation suppresses the deformation of the droplet and augments small-scale breakup. A shift in dominant breakup mechanisms is linked to a significant increase in the Weber number due to an increase in flow velocities and temperatures when transitioning to the detonation case. The experimental data are combined with a droplet stability analysis to predict the “child” (or fragments of the initial “parent” droplet) droplet sizes of each test condition. The child droplet size is shown to decrease as the flow regime transitions toward a detonation. An analytical mass stripping model was also used to determine that the total mass stripped from the parent droplet increased when approaching supersonic reacting conditions. The child droplet sizes and mass stripping rate will ultimately influence evaporation timescales and ignition in supersonic reacting flows, which is important for the development of detonation-based propulsion and power systems.

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来源期刊
Shock Waves
Shock Waves 物理-力学
CiteScore
4.10
自引率
9.10%
发文量
41
审稿时长
17.4 months
期刊介绍: Shock Waves provides a forum for presenting and discussing new results in all fields where shock and detonation phenomena play a role. The journal addresses physicists, engineers and applied mathematicians working on theoretical, experimental or numerical issues, including diagnostics and flow visualization. The research fields considered include, but are not limited to, aero- and gas dynamics, acoustics, physical chemistry, condensed matter and plasmas, with applications encompassing materials sciences, space sciences, geosciences, life sciences and medicine. Of particular interest are contributions which provide insights into fundamental aspects of the techniques that are relevant to more than one specific research community. The journal publishes scholarly research papers, invited review articles and short notes, as well as comments on papers already published in this journal. Occasionally concise meeting reports of interest to the Shock Waves community are published.
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