Development of a Lagrangian–Eulerian approach-based five-equation two-fluid model for simulation of multiphase reactive flows

Abstract

The purpose of the current study is to develop numerical capability to analyze the flow structures of the scramjet engine in which many complex physical phenomena are involved, such as shock waves, breakup, atomization, and chemical reactions. To understand these complex physical phenomena, we first proposed the five-equation multiphase flow model coupling with the Lagrangian method to reproduce the process of fuel atomization and evaporation in a flow over a side jet problem. Shock waves, recirculation zones, and breakup processes of droplet particles were well captured in the computational works. It was shown that the five-equation multiphase model achieved better resolution of the shock-capturing comparing with the single-phase Navier–Stokes equation coupling with the Lagrangian approach. In addition, the single-step reaction model was performed with the current five-equation multiphase model to simulate the detonative cell in the detonation flow problem. The detonation waves under various operating conditions were discussed. Finally, a preliminary simulation is applied to the flow phenomena through DLR scramjet. The current works have achieved satisfactory agreement compared to the experimental data no matter in reacting flow case or nonreacting flow case.

Keywords:

• Atomization
• cellular structure
• detonation wave
• five-equation two-fluid model
• multiphase flow
• shock wave

Acknowledgement

We acknowledge the computer facility supported by the National Center for High-Performance Computing, Hsin-Chu, Taiwan.

Additional information

Funding

The authors acknowledge the support of the Ministry of Science and Technology, R.O.C. under the grant of 110- 2221-E-032-020-MY3.