Internal flow and energy loss characteristics of asymmetric pulse device
CHEN Qi1, LI Wei1, 2*, JI Leilei1, LU Dele1, PAN Yunxin1
1. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. Institute of Fluid Engineering Equipment Technology, Jiangsu University, Zhenjiang, Jiangsu 212009, China
Abstract：In order to study the pulse jet performance and internal loss mechanism, an asymmetric pulse jet device was used as the research object to investigate the effects of different forms of the impeller and disc valve clearances on the pulse performance of the device. The energy loss in the device is quantitatively analyzed by using entropy generation theory. The research shows that when the moving disc valve channel and the static disc valve orifice fit, the maximum pulse velocity at the outlet of the device is reached. The maximum pulse velocity of the new axial flow impeller device is 47.22 m/s, and the maximum pressure pulse amplitude is 1.07 MPa, which is similar to the pulse performance of the initial impeller device; The total entropy production of the hydrodynamic impeller section of the pulse jet device of the initial impeller is 33.90 W/K, while the total entropy production of the hydrodynamic impeller section of the pulse jet device of the new axial flow impeller is 28.72 W/K. The energy loss of the impeller section of the pulse jet device of the new axial flow impeller is less; The pulse jet device can form periodic strong asymmetric pulse jet. The smaller the gap between the moving disc valve and the stationary static disc valve, the better the pulse performance of the device and the greater the energy loss.
