气体混合物中直接起爆能量的临界衰变时间模型

IF 1.7 4区 工程技术 Q2 ENGINEERING, AEROSPACE Journal of Propulsion and Power Pub Date : 2023-09-03 DOI:10.2514/1.b39263
Yuen Liu, Qing Xie, Yuxuan Chen, Rémy Mével, Zhuyin Ren
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引用次数: 0

摘要

建立了一个临界衰变时间(CDT)模型来预测气体混合物中直接起爆的临界能量。基于全局启动标准,能量沉积应允许衰减冲击速度至少在临界衰减时间内保持在低于Chapman–Jouguet(CJ)速度的特定范围内。速度范围通过子CJ Zeldovich–von Neumann–Döring(ZND)模拟进行估计。在亚CJ-ZND模拟中,临界衰变时间被计算为达到单位马赫数的最短时间。速度下限被视为低于直接启动应失败的特征消光速度(这意味着速度下限)。该速度使用[公式:见正文]混合物的一维模拟进行校准。然后,将校准后的CDT模型应用于点爆破理论估算临界起爆能量。与众所周知的临界衰变率模型相比,该模型与氢燃料混合物(如[公式:见正文]和[公式:参见正文]混合物)的实验数据更为一致。对于以碳氢化合物为燃料的小型混合物,如[公式:见正文]、[公式:见图正文]、]公式:见文本]和[公式:见正文]混合物,预测的临界能量也与实验结果一致。CDT模型为评估燃料-氧化剂混合物的可解毒性提供了一个有效的工具,这可能有利于推进和动力装置(如旋转爆震发动机)的点火启动。
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Critical Decay Time Model for Direct Detonation Initiation Energy in Gaseous Mixtures
A critical decay time (CDT) model is developed to predict the critical energy of direct detonation initiation in gaseous mixtures. It is based on the global initiation criterion that the energy deposit should allow the decaying shock speed to stay in a specific range below the Chapman–Jouguet (CJ) speed at least for a critical decay time. The speed range is estimated with the sub-CJ Zel’dovich–von Neumann–Döring (ZND) simulations. The critical decay time is calculated as the minimum time to reach unity Mach number in the sub-CJ ZND simulations. The lower-speed bound is taken as a characteristic extinction speed below (which means the lower-speed bound) which the direct initiation should fail. This speed is calibrated using one-dimensional simulations for [Formula: see text] mixtures. The calibrated CDT model is then applied to estimate the critical initiation energy with the point-blast theory. The model yields better agreement with experimental data for hydrogen-fueled mixtures such as [Formula: see text] and [Formula: see text] mixtures than the well-known critical decay rate model. For small hydrocarbon-fueled mixtures such as [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text] mixtures, the predicted critical energies also agree well with experimental results. The CDT model provides an efficient tool to evaluate the detonability of fuel–oxidizer mixtures, which could be beneficial for ignition initiation in propulsion and power devices such as rotating detonation engines.
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来源期刊
Journal of Propulsion and Power
Journal of Propulsion and Power 工程技术-工程:宇航
CiteScore
4.20
自引率
21.10%
发文量
97
审稿时长
6.5 months
期刊介绍: This Journal is devoted to the advancement of the science and technology of aerospace propulsion and power through the dissemination of original archival papers contributing to advancements in airbreathing, electric, and advanced propulsion; solid and liquid rockets; fuels and propellants; power generation and conversion for aerospace vehicles; and the application of aerospace science and technology to terrestrial energy devices and systems. It is intended to provide readers of the Journal, with primary interests in propulsion and power, access to papers spanning the range from research through development to applications. Papers in these disciplines and the sciences of combustion, fluid mechanics, and solid mechanics as directly related to propulsion and power are solicited.
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