Multi-objective optimization of a high efficiency and suction performance for mixed-flow pump impeller

Proceedings of the Institution of Mechanical Engineers, Part C:

et al. 2020

Tubular pumps are widely used in irrigation and water conveyance projects. However, the operating head of most of these pumps is low, and only a few studies have focused on the design of an efficient tubular pump with a head more than 5 m, which is common in long-distance water supply projects. This work aims to improve the operating head and efficiency of tubular pumps while maintaining a low shaft power. The multi-objective orthogonal optimization method was used to determine the critical parameters of the tubular pump, i.e., blade number, airfoil, blade thickness and guide vane distance, and nine design schemes were selected. Next, by using computational fluid dynamics (CFD), a 3D model of the tubular pumps under different schemes was established, and the results were compared. Subsequently, the range method and weighted matrix method were utilized to find the optimized scheme. In addition, an experimental investigation was performed to verify the simulation and the performance of the designed tubular pump. The results indicated that the optimized scheme improved the operating head to 6.9 m with higher efficiency of 84.2% and a lower shaft power of 27.7 kW. The modeling results were in agreement with the experimental measurements, and the designed tubular pump had a wide range of high-efficiency zones.

Section: Introductionmentioning

confidence: 99%

Multiobjective optimization of a tubular pump to improve the applicable operating head and hydraulic performance

Zhao

Proceedings of the Institution of Mechanical Engineers, Part C:

et al. 2020

“…Pinto et al (2017) provided a more comprehensive overview of the latest application of CFD in turbomachinery, including compressors, turbines, and pumps. More and more researchers regard CFD as an indispensable tool to investigate extended topics, such as the flow-induce noises in pumps (Si et al, 2019) and multi-objective optimization of impeller blades in the mixed flow pump (Dash et al, 2018;Suh et al, 2019). More uses are extended to other fields.…”

Section: Introductionmentioning

confidence: 99%

Clocking effect of outlet RGVs on hydrodynamic characteristics in a centrifugal pump with an inlet inducer by CFD method

Engineering Applications of Computational Fluid Mechanics

Jiang

et al. 2021

This paper investigates the hydrodynamic characteristic of a single-stage centrifugal pump with inlet inducer and outlet Radial Guided Vanes (RGVs) influenced by the clocking effect for the first time. Different from general ones, the outlet RGVs in this paper have specificities. The hydraulic performance and dynamic characteristics of the centrifugal pump are numerically studied and validated by experiments. The results indicate that there is an optimum position of RGVs that can not only increase the pump head and efficiency but also reduce the pressure fluctuation intensity. A non-dimensional parameter describing the velocity non-uniformity of the impeller outlet is first proposed, which is negatively related to the pump's hydraulic performance. The clocking position of the RGVs will affect the velocity homogeneity at the impeller outlet, and further influence the hydraulic characteristics of the pump. Besides, the clocking effect of outlet RGVs mainly affects the amplitudes of BPF for both the pressure fluctuation and radial force, and the most obvious frequency of pressure pulsation and radial force is 3 BPF correlating with the inlet inducer. It is recommended to install the volute-tongue tip near the middle of two vanes.

“…As a core component of the waterjet propulsion system, effective operation of the pump is conducive to the improvement of the overall system efficiency. Local and international experts and scholars conducted extensive research on the optimization of the pump, including centrifugal [6][7], mixed flow [8][9], and axial pumps [10][11]. With the improvement of design and manufacturing level of pumps, the operation stability and efficiency of mixed and axial flow pumps -being two commonly used pumps in waterjet propulsion systems -have been greatly enhanced [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Key Parameters for Hydraulic Optimization of an Inlet Duct Based on a Whole Waterjet Propulsion Pump System

Jiao

Cheng

et al. 2021

TFAMENA

The hydraulic performance of an inlet duct directly affects the overall performance of a waterjet propulsion system. Key parameters for the hydraulic optimization of the inlet duct are explored using the computational fluid dynamics (CFD) technology to improve the hydraulic performance of the waterjet propulsion system. In the CFD simulation and experiment, an inlet duct with different flow and geometric parameters is simulated. By comparing grid sensitivity and different turbulence models, a suitable grid size and a turbulence model are determined. The comparison between the numerical simulation and the experiment shows that the numerical results are reliable. The results of the calculation and analysis of different speed cases show that the ship speed affects the efficiency of the waterjet propulsion system. In particular, the system efficiency increases first and then decreases with an increase in the ship speed. Under the conditions of constant ship speed and rotational speed, the influence of the length and dip angle of the inlet duct on the waterjet propulsion system is investigated using a single factor method. The results show that the dip angle has an obvious effect on the hydraulic performance of the inlet duct, and an extremely small angle of inclination will lead to poor flow patterns in the inlet passage. When the length is approximately six times the inlet duct outlet diameter, and the dip angle is 30°-35°, the hydraulic performance of the waterjet propulsion pump system is satisfactory.