关键词: 超燃冲压发动机;污染效应;并行计算;化学反应动力学模型

Abstract: Understanding the complicated issues with regard to the effects of airstream vitiation on scramjet test performance requires a lot of efforts involving experiment, modeling and CFD simulation. Based on comparative experiments for combustion in clean air and air vitiated with H₂O, massively parallel CFD simulations of reacting flowfield in the combustor for three cases corresponding to experimental conditions were conducted with a relatively detailed chemical kinetic model involving 13 species and 33 reactions. The simulated results are close to measured wall pressures of comparative experiments, and could “distinguish” the vitiation effects of H₂O in test gas. The simulated results show that for overall performance of the combustor, 7.4% H₂O and 18.3%H₂O contaminants of inflow decrease the thrust by 4.1% and 10.7% for unit air mass flow rate, and the combustion efficiency by 5.5%and 9.5%, respectively.

Key words: Scramjet; Vitiation effect; Parallel computation; Chemical kinetic model