Abstract
The present study focuses on numerical simulation of the gas-solid suspension flow in a supersonic nozzle. The Euler- Lagrange approach using a Discrete Phase Model (DPM) has been used to solve the compressible Navier-Stokes equa- tions. A fully implicit finite volume scheme has been employed to discretize the governing equations. Based upon the present CFD results, the particle loading effect on gas-solid suspension flow was investigated. The results show that the presence of particles has a big influence on the gas phase behavior. The structure of shock train, the separation point, and the vortex of the backflow are all related to particle loading. As the particle loading increases the flow characteris- tics behave differently such as 1) the strength of shock train decreases, 2) the separation point moves toward the nozzle exit, 3) the number and strength of vortex increase, 4) the strength of first shock also increases while the other pseudo shocks decreases. The change of gas flow behavior in turn affects the particle distribution. The particles are concen- trated at the shear layers separated from the upper wall surface.
Highlights
High-velocity gas flows including very fine solid particles are often encountered in many diverse fields of engineering applications, such as solid rocket engines, pneumatic conveying systems, powdered drug delivery devices, thermal spray coating systems, etc. [1]
The present study focuses on numerical simulation of the gas-solid suspension flow in a supersonic nozzle
The structure of shock train, the separation point, and the vortex of the backflow are all related to particle loading
Summary
High-velocity gas flows including very fine solid particles are often encountered in many diverse fields of engineering applications, such as solid rocket engines, pneumatic conveying systems, powdered drug delivery devices, thermal spray coating systems, etc. [1]. Such gas-solid suspension flows can be obtained in supersonic nozzles in which fine particles with several to several 10 μm in diameter are flowing suspended with the high velocity gas stream. A flow in which particle motion is controlled by inter-particle collision is referred to as a “dense flow” In this kind of flow, the particleparticle collision cannot be neglected. Okuda and Choi [8] have done the analytical and experimental study gas-particle mixture flow in various types of convergent-divergent nozzle. They found the velocity of particle was influenced by particle size, particle density, nozzle geometry, and operating conditions, etc. Present study will investigate particle loading effect on supersonic suspension flow through a convergent-divergent nozzle. The discrete particle phase (DPM) from FLUNT was employed to calculate the particle motions, and the two way turbulence coupling method was used to monitor the particle-turbulent interactions
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