镁基燃料水冲压发动机的热声振荡特性研究

推进技术 ›› 2016, Vol. 37 ›› Issue (4): 669-674.

镁基燃料水冲压发动机的热声振荡特性研究

杨亚晶,李晓亚,荆宏达

西安交通大学航天学院机械结构强度与振动国家重点实验室，陕西西安 710049,西安交通大学航天学院机械结构强度与振动国家重点实验室，陕西西安 710049,西安交通大学航天学院机械结构强度与振动国家重点实验室，陕西西安 710049

发布日期:2021-08-15
作者简介:杨亚晶，女，博士，讲师，研究领域为流动、传热及燃烧稳定性方面。
基金资助:
国家自然科学基金(11102151)；高等学校博士学科点专项科研基金(20110201120022)；中央高校基本科研业务费专项资金。

Characteristics of Thermoacoustic Oscillations in Magnesium-Based Water Ramjet

School of Aerospace，State Key Laboratory for Strength and Vibration of Mechanical Structures， Xi’an Jiaotong University，Xi’an 710049，China,School of Aerospace，State Key Laboratory for Strength and Vibration of Mechanical Structures， Xi’an Jiaotong University，Xi’an 710049，China and School of Aerospace，State Key Laboratory for Strength and Vibration of Mechanical Structures， Xi’an Jiaotong University，Xi’an 710049，China

Published:2021-08-15

摘要/Abstract

摘要： 为了探究金属基燃料发动机内的燃烧不稳定性问题，以镁基燃料水冲压发动机为背景，从理论上开展了热声振荡机理及特征频率特性的研究。通过Mg/H2O燃烧化学反应动力学分析，证实了高温环境中水的热分解特性是引起燃烧反应热释放波动的原因，结合不稳定燃烧中的声压振荡，合理解释了热声振荡的发生机理。进一步考虑平均流作用，建立了一维热声振荡计算模型，基于自行开发的热力计算程序，获得了三种选定镁基燃料一次燃烧产物的热力学性质及燃烧水燃比的上限2.0，2.4，2.6，同时结合边界条件、守恒条件求解了声压传播方程，获得了不同工况下的复频特性，实部均在700Hz以内属低频振荡，镁基燃料质量组分配比、进水口位置及水燃比均对特征频率虚部有较大影响，对于既定的燃烧室结构构型及镁基燃料，可通过调节进水量来主动干预热声振荡的发展趋势。

关键词: 金属基燃料；热声振荡；特征频率；水燃比

Abstract: Characteristics of thermoacoustic oscillations in magnesium-based water ramjets are investigated theoretically. The mechanism of thermoacoustic oscillations for magnesium combustion in steam atmospheres has been obtained based on analysis of Mg/H2O chemical reaction kinetics，and the results indicate that water dissociation under high temperature arouse heat release fluctuations，then coupled with pressure fluctuations under reliable phase，thermoacoustic oscillations would occure. A one-dimensional calculation model considering a mean flow for calculating eigenfrequency of thermoacoustic oscillations is established，and it is known that thermodynamic properties of primary combustion products and maximum water/fuel ratio 2.0，2.4，2.6 could be achieved based on developed thermodynamic calculation. The pressure wave equation is solved based on these inlet thermodynamic properties coupled with boundary conditions and conservation conditions. The results show that the oscillation model belongs to low-frequency oscillation due to real part of eigenfrequency less than 700Hz，while the imaginary part profile of complex frequency along with water/fuel ratio，water inlet position for three magnesium-based fuels indicate that these three factors hold great influence，and the development trend of oscillations could be transformed by through altering water supply.

Key words: Metal-based fuel；Thermoacoustic oscillations；Eigenfrequency；Water/fuel ratio

杨亚晶,李晓亚,荆宏达. 镁基燃料水冲压发动机的热声振荡特性研究[J]. 推进技术, 2016, 37(4): 669-674.

YANG Ya-jing,LI Xiao-ya,JING Hong-da. Characteristics of Thermoacoustic Oscillations in Magnesium-Based Water Ramjet[J]. Journal of Propulsion Technology, 2016, 37(4): 669-674.

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