Numerical Analysis of a Spray Combustion with Nongray Radiation Using Weighted Sum of Gray Gases Model

Abstract

In this study, the effect or radiation has been considered in a liquid spray combustion chamber. The discrete ordinates method (DOM) was employed to solve the radiative transfer equation (RTE) and the weighted sum of gray gases model (WSGGM) was applied to model a nongray radiation effect by C02 and H20 gases. The absorption coefficients derived from WSGGM were used with DOM by summing solutions of the RTE for each gray gas. Eulerian- Lagran-gian scheme was adopted to alalyze the two phase combustion. The interactions between two phases are accounted for by using the particle source in cell(PSIC) model. The results have shown that the gasfication of the droplets is more quickly completed by radiation, which results in shorter droplet trajectories. The radiation also led to a broader high temperature zone inside the combustor. Therefore, it was found that the performance of the spray combus-tor was enhanced by the radiation effect.

Keywords:

• Spray combustion
• nongray radiation
• discrete ordinates method (DOM)
• weighted sum of gray gases model (WSGGM)

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Notes on contributors

SEUNG WOOK BAEK

Corresponding author. Prof. Seung Wook Beak Korea Advanced Institute of Science and Technology Aerospace Engineering Department 373-1 Gusungdong, Yusungku, Taejon, South Korea Tel: [phone] Fax: [phone] E-Mail: swbaek@sorak. kaist.ac.kr