旋转爆震波发动机推力性能研究
毕业论文关键词 旋转爆震波发动机 推力 比冲 喷管 数值模拟
Title The Study on Thrust Performance of Rotating DetonationEngineAbstractIn recent years, rotating detonation engines (RDE) become a hot topic, but thereare relatively few studies on the thrust and specific impulse. In this paper,experiments and numerical simulation were used to study four factors affectingthe performance of the RDE: the equivalence ratio, chamber length, mass flow rateand nozzle. After detailed analysis, the conclusions were drawn.The H2/Air rotating detonation engine with tilt slot-holes was used in thisexperiment. The atmospheric pressure was selected as back pressure. Results showthat: in a certain range of conditions, thrust and specific impulse increased withincreasing equivalent ratio; the length of combustion chamber and mass flow ratewas proved to influence thrust and specific impulse heavily. Moreover, the engineinstalled a nozzle at the outlet could generate greater thrust and specificimpulse. It had been proved that Laval nozzle performed best within a certain rangeof conditions.A reduced kinetic mechanism based on 8-step reaction and 7 species was usedto simulate three-dimensional rotating detonation engine. The transport processessuch as thermal conduction, viscosity and diffusion were omitted in the study.The back pressure was set to atmospheric pressure. Results show that, under thesame conditions, the longer the length of combustion chamber, the smaller thethrust and specific when mass flow rate is low. The converging nozzle exhibitedsuperior performance within certain range of conditions. The expansion ratio andthe width of the throat of Laval nozzle were also illustrated to have some influenceon the thrust and the specific impulse.
Keywords Rotating detonation engine Thrust Specific impulse Nozzle Numerical simulation
目次
1引言1
1.1研究背景与意义.1
1.2旋转爆震波产生与传播机理.2
1.3旋转爆震波发动机研究进展与现状.3
1.3.1实验研究进展与现状3
1.3.2数值模拟研究进展与现状4
1.4论文主要研究内容.6
2H2/Air旋转爆震波发动机推力测量实验.7
2.1实验系统组成.7
2.2推力测量结果.8
2.2.1H2/Air当量比对旋转爆震波发动机推力性能的影响.9
2.2.2H2/Air质量流率对旋转爆震波发动机推力性能的影响.12
2.2.3轴向长度对旋转爆震波发动机推力性能的影响14
2.2.4喷管对旋转爆震波发动机推力性能的影响14
2.3本章小结.17
3H2/Air旋转爆震波发动机数值模拟.18
3.1控制方程组和计算方法.18
3.1.1控制方程组18
3.1.2求解方法19
3.2物理模型及边界条件.20
3.3三文数值模拟结果.21
3.3.1燃烧室长度对旋转爆震波发动机推力性能的影响21
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