Numerical Study of a Supersonic Nozzle Gas Jet Laden with a Dry Powder Fire-extinguishing Agent Injected from a Bypass Injector

Zhang, L.; Wu, S.; Feng, Y.; Guan, H.

doi:10.47176/jafm.18.4.2840

Numerical Study of a Supersonic Nozzle Gas Jet Laden with a Dry Powder Fire-extinguishing Agent Injected from a Bypass Injector

Document Type : Regular Article

Authors

School of Mechanical Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China

10.47176/jafm.18.4.2840

Abstract

To enhance the firefighting capabilities of traditional dry powder extinguishers, we incorporated an air-assisted supersonic nozzle, which is simulated using Euler-Lagrange interphase coupling to simulate the injection of firefighting agents into a supersonic, two-dimensional axisymmetric gas flow from a bypass injector. During the simulation, we employed our newly developed modified drag coefficient model, capable of accommodating a broad spectrum of particle Reynolds and Mach number conditions. Parameter studies show that an increase in the injector position, angle, and total pressure ratio generally causes a decrease in the average particle velocity v_p,a, and an increase in the dispersion Ψ_p and velocity unevenness Φ_vp; an increase in the total pressure ratio of the main nozzle leads to an increase in Φ_vp and v_p,a. However, under specific conditions, the monotonic dependency upon these parameters may be disrupted. For example, the performance indicators at the position of the injector near the nozzle throat and a larger total injector pressure ratio, as well as v_p,a at smaller injection angles and Ψ_p at larger injection angles, may run counter to the monotonicity.

Keywords

Main Subjects

Multiphase and Particle-Laden Flows

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