Abstract

The turbulent flow field characteristics of a gun-type gas burner with and without a duct were investigated under the isothermal condition of non-combustion. Vectors and mean velocities were measured by hot-wire anemometer system with an X-type hot-wire probe in this paper. The turbulent flow field with a duct seems to cause a counter-clockwise recirculation flow from downstream to upstream due to the unbalance of static pressure between a main jet flow and a duct wall. Moreover, the recirculation flow seems to expand the main jet flow to the radial and to shorten it to the axial. Therefore, the turbulent flow field with a duct increases a radial momentum but decreases a axial momentum. As a result, an axial mean velocity component with a duct above the downstream range of about X/R=1.5 forms a smaller magnitude than that without a duct in the inner part of a burner, but it shows the opposite trend in the outer part.

Keywords

• Duct;
• Gun-Type Gas Burner(GTGB);
• Hot-Wire Anemometer(HWA);
• Slit;
• Subsonic Wind Tunnel;
• Swirl Flow;
• Swirl Vane;
• X-Type Hot-Wire Probe(X-probe)

• 덕트;
• 건식가스버너;
• 열선풍속계;
• 슬릿;
• 아음속풍동;
• 스월유동;
• 스월베인;
• X형열선프로브;