Delavan nozzle

To accomplish these things, nozzles are available in different spray patterns and different spray angles. Figure 19.10 below illustrates the Delavan nozzle and three basic patterns that satisfy a wide range of the oil-fired burner requirements. 

Examples of the spray pattern produced by the Delavan nozzles (a) hollow, (b) solid cone, and (c) all purpose. 

A series of experiments has been carried out in the group of G. Brenn, TU Graz, Austria, for water sprays and PVP/water (20% PVP and 80% water by mass) sprays in air with different liquid mass inflow rates [42]. Various atomizers with different dimensions of swirl chambers and exit diameters were used. At various cross-sections, the droplet sizes and velocities are recorded for different liquid inflow rates using phase Doppler anemometry (PDA) [52]. The present simulations concern the experimental data using the Delavan nozzle SDX-SD-90 with an internal diameter of 0.002 m and an outer diameter of 0.012 m at the nozzle throat and 0.016 m at the top [42]. The liquid inflow rates for water/air spray are 80kg/h and 120 kg/h, and a 112 kg/h flow rate is used for the spray of a PVP/water solution in air. The spray is injected into a cylindrical spray chamber with a diameter of 1 m. The carrier gas is at standard conditions. Measurements are taken at cross-sections of 0.08 m, 0.12 m, and 0.16 m away from nozzle exit. The experimental data at the closest position to the nozzle is used to generate initial data for the numerical computations [53]. 

Figure 4 shows a three-dimensional distribution of the Sauter mean diameter, measured 38.1-mm downstream from the nozzle using a Delavan 1 GPH-80°A pressure atomizer. The operating pressure was 690 kPa (100 psi). TypicaUy, the mean diameters graduaUy increase with an increase in radial... 

Olson, E. Fuel Nozzles for Oil Burners Technical Aspects of Applications. Delavan Technical Publication (www.dela-van.com). 

---