连续旋转爆轰燃烧室增压特性的热力学分析

推进技术 ›› 2018, Vol. 39 ›› Issue (5): 1057-1066.

连续旋转爆轰燃烧室增压特性的热力学分析

郑洪涛,祁磊,赵宁波,刘世铮

哈尔滨工程大学动力与能源工程学院，黑龙江哈尔滨 150001,哈尔滨工程大学动力与能源工程学院，黑龙江哈尔滨 150001,哈尔滨工程大学动力与能源工程学院，黑龙江哈尔滨 150001,哈尔滨工程大学动力与能源工程学院，黑龙江哈尔滨 150001

发布日期:2021-08-15
作者简介:郑洪涛，男，博士，教授，研究领域为燃气轮机燃烧技术、燃气轮机先进循环技术等。E-mail: zhenghongtao9000 @163.com 通讯作者:赵宁波，男，博士，讲师，研究领域为爆轰燃烧推进技术。
基金资助:
中央高校基本科研业务费专项资金(HEUCFJ170304)。

Thermodynamic Analysis on Pressurization Characteristics of Continuously Rotating Detonation Combustor

College of Power and Energy Engineering，Harbin Engineering University，Harbin 150001，China,College of Power and Energy Engineering，Harbin Engineering University，Harbin 150001，China,College of Power and Energy Engineering，Harbin Engineering University，Harbin 150001，China and College of Power and Energy Engineering，Harbin Engineering University，Harbin 150001，China

Published:2021-08-15

摘要/Abstract

摘要： 为了探究连续旋转爆轰燃烧室(CRDC)增压特性产生的根本原因，利用二维可压缩欧拉方程对正庚烷-空气CRDC进行了数值研究，从熵和自由能变化的角度对比了燃气轮机燃烧过程、等压燃烧过程、旋转爆轰燃烧过程和等容燃烧过程的差异，并分析了轴向尺寸对CRDC增压特性的影响。研究表明:对比等压燃烧过程，旋转爆轰燃烧过程熵增更小，吉布斯自由能损失更小，出口工质做功能力更强；但旋转爆轰燃烧过程增压能力远小于等容燃烧过程。轴向尺寸越小，旋转爆轰燃烧过程中经斜激波作用的工质比例越小，吉布斯自由能损失越小，CRDC的增压能力越大。当轴向尺寸由200mm逐渐减小至100mm，CRDC的热效率始终保持在99%以上，增压比由1.8279提高至2.2167，吉布斯自由能减小量由5067.1kJ/kg降低至4914.6kJ/kg，然而等容燃烧过程增压比为6.1467，吉布斯自由能减小量为4192.2 kJ/kg，两者仍有较大差距。

关键词: 旋转爆轰；数值模拟；增压比；熵；吉布斯自由能

Abstract: Based on compressible Euler equation， two-dimensional numerical study was conducted to investigate the basic reason of pressurization characteristics in continuously rotating detonation combustor (CRDC) using heptane-air mixture. The difference from gas turbine combustion， isobaric combustion， rotating detonation combustion and constant-volume combustion was discovered by studying the entropy and Gibbs free energy. And the effects of axial length on pressurization characteristics were analyzed. It can be concluded that compared with that in isobaric combustion， the smaller entropy increase in rotating detonation combustion contributes to a smaller loss of Gibbs free energy and a stronger potential power. But the pressurization ratio in rotating detonation combustion is still much smaller than that in constant-volume combustion. With the decrease of axial length， the ratio of the working fluid passing through the oblique shock in CRDC decreases， so the loss of Gibbs free energy decreases， and the pressurization characteristics of CRDC strengthens. When the axial length decreases from 200mm to 100mm gradually， the thermal efficiency is always greater than 99%， the pressurization ratio increases from 1.8279 to 2.2167， and the loss of Gibbs free energy decreases from 5067.1kJ/kg to 4914.6kJ/kg， but there are also great gaps as the pressurization ratio is 6.1467 and the loss of Gibbs free energy is 4192.2kJ/kg in constant-volume combustion.

Key words: Rotating detonation；Numerical simulation；Pressurization ratio；Entropy；Gibbs free energy

郑洪涛,祁磊,赵宁波,刘世铮. 连续旋转爆轰燃烧室增压特性的热力学分析[J]. 推进技术, 2018, 39(5): 1057-1066.

ZHENG Hong-tao,QI Lei,ZHAO Ning-bo,LIU Shi-zheng. Thermodynamic Analysis on Pressurization Characteristics of Continuously Rotating Detonation Combustor[J]. Journal of Propulsion Technology, 2018, 39(5): 1057-1066.

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