Structural design and test of small flow negative pressure feedback jet nozzle
WANG Xi1, WANG Xinkun1*, YAO Jicheng2, MENG Tianshu1, JIN Binbin3,YAN Hailan1, Huang Jianxiang1
1. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. Xuzhou Water Conservancy Project Construction Management Center, Xuzhou, Jiangsu 221000, China; 3. Tangshan Water Administration Supervision Detachment, Tangshan, Hebei 063000, China
Abstract：To further improve the theoretical system for the design of domestic jet pulse nozzles, this research proposed a negative pressure feedback jet nozzle with an inlet width of 2 mm for small flow rate conditions. The single-factor analysis was utilized to determine the effective design interval of the key design parameters of the nozzle, including bit difference ratio, splitting distance ratio, and sidewall inclination angle. A nine-factor four-level orthogonal test with the objective functions of inlet flowrate, outlet velocity, and jet range was conducted to obtain the optimal internal structure parameters of the nozzle. Finally, the results were validated by experiments. The comparison indicated that the numerical results show a remarkable agreement with the experiment. Meanwhile, compared with the national standard and Foreign products, the range of the jet pulse nozzle is improved by 17.3%-23.5% and 19.1%-20.0% under the same operating condition. Furthermore, this research illustrates a valuable method that can guide the subsequent research and domestic product development of this type of nozzle.
