TAILIEUCHUNG - Air and Abrasive Acceleration_2

Tham khảo tài liệu 'air and abrasive acceleration_2', kỹ thuật - công nghệ, điện - điện tử phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 64 3 Air and Abrasive Acceleration The abrasive mass flow rate must be inserted in kg min. The coefficient of regression is as high as for all fits. It can be seen that 0P 1 for mP 0. For a typical abrasive mass flow rate of mP 10kg min the equation delivers 0P which corresponds well with the values cited earlier. The regression is valid for Laval nozzles fed with steel grit. The basic number in is independent of the dimensions of the nozzles dN lN and it can be assumed to be typical for Laval nozzles. However the basic number may change if other abrasive materials than steel grit are utilised. Results of measurements of volumetric flow rates performed by some authors are presented in Figs. and Fig. . The results provided in Fig. demonstrate the effects of different abrasive types on the volumetric air flow rate. The addition of chilled iron was more critical to the volumetric air flow rate compared with the addition of the non-ferrous abrasive material. The results plotted in Fig. showed that air volumetric flow rate depended on abrasive type nozzle type and air pressure if abrasive material was added. Interestingly the effect of the abrasive material type was only marginal for small nozzle diameters. This effect was also reported by Adlassing 1960 . The reduction in air flow rate was more severe if a Laval nozzle was utilised instead of a standard nozzle. Laval nozzles consumed approximately 10 more air volume than conventional cylindrical nozzles if abrasives quartz SiC corundum and steel grit were added Lukschandel 1973 . This result agrees with measurements provided in Table . Based on these results the following very preliminary approach can be made Fig. Effect of abrasive type on volumetric air flow rate Plaster 1973 Air Flow in Nozzles 65 Fig. Effects of air pressure nozzle diameter nozzle geometry and abrasive type on volumetric air flow rate Lukschandel 1973 . N - cylindrical nozzle L - .

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