Orthogonal experiment on structural parameters of self-suction pulse nozzle for cleaning
LIU Houlin1,2*, ZHANG Zhaoliang1, WANG Yong1,2
1. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. Zhenjiang Fluid Engineering Equipment Technology Research Institute, Jiangsu University, Zhenjiang, Jiangsu 212000, China
Abstract：In order to study the effect of suction on the operating characteristics of pulse nozzles, a self-suction pulse nozzle for intelligent toilets cleaning was designed, and the overall performance test rig of which was also built. With the optimization objective of improving the jet performance of the pulse nozzle, the inlet hole diameter, the inlet hole position and the inclination angle of the nozzle cavity bottom were selected as the optimization variables, and the optimization scheme orthogonal experimental design is adopted to measure the nozzles under different structural parameters. The experimental results show that there are few interactions among structural parameters of the self-suction pulse nozzle, except the inlet hole position and the inclination angle of the nozzle cavity bottom. The single factor that has the greatest influence on the jet striking force and the main frequency of jet pulse is the inlet hole dia-meter. Compared with the non-suction one before optimization, the jet velocity of the optimized self-suction pulse nozzle is increased by 150% with lower jet decay rate and larger jet range. The hitting force and main frequency is increased by 44.4% and 33.3% respectively. In addition, the amplitude of the hitting force and cleaning rate are higher than those before optimization, up to 80.0% and 98.3%, respectively.
