Hypersonic rarefied flows DSMC analysis by a simplified chemical model
Hypersonic rarefied flows DSMC analysis by a simplified chemical model
复制标题
通过简化化学模型进行高超声速稀薄流 DSMC 分析
DOI:
10.1007/bf00987128
复制
发表时间:
1995
期刊:
影响因子:
2.7
通讯作者:
S. Sibilla
中科院分区:
文献类型:
--
作者:
C. Cercignani;A. Frezzotti;S. Sibilla
A simplified model for the analysis of molecular and reaction dynamics in hypersonic flows of rarefied gases is used to investigate the influence of oxygen dissociation in the prediction of aerothermal coefficients. The model is a direct simulation Monte Carlo method derived from the Larsen-Borgnakke method for the analysis of inelastic collisions. Tests performed in conditions near to re-entry conditions at an altitude of 115 km show significant effects of chemical reactions on the evaluation of the heat-transfer coefficient, while no real influence is found on lift and drag coefficients. Good agreement is found with results achieved using more sophisticated chemical models, as a 4 % maximum difference arises in the determination of surface quantities in re-entry conditions at 160 km.SommarioSi studiano gli effetti delle reazioni chimiche sui coefficienti aerodinamici di un' ala piana priva di spessore in regime di moto ipersonico in un gas rarefatto. A tal fine, si sono ottenute delle soluzioni numeriche della equazione di Boltzmann con reazioni chimiche mediante il cosiddetto metodo di Simulazione Diretta. Le collisioni reattive sono state trattate con un modello fortemente semplificato che però fornisce risultati molto vicini a quelli ottenuti da modelli più sofisticati.