Abstract
In order to study the internal flow characteristics of centrifugal pumps with a split impeller under gas-liquid mixed transportation conditions, this paper conducted a steady calculation of the flow field in the centrifugal pump under the conditions of different inlet gas volume fractions based on the Eulerian-Eulerian heterogeneous flow model, using air and water as the working media and the Schiller Nauman model for the interphase resistance. This paper takes a low specific speed centrifugal pump as the research object, through the controlling variables, using the same pump body structure and pump body geometric parameters and setting three different arrangements of long and short blades (each plan uses the same long and short blades) to explore the influence of the short blade arrangement on the low specific speed centrifugal pump performance under a gas-liquid two-phase flow. The research results show that, under pure water conditions, the reasonable arrangement of the short blade circumferential position can eliminate the hump of the centrifugal pump under low-flow conditions, can make the flow velocity in the impeller more uniform, and can optimize the performance of the pump. Under the design conditions and the gas-liquid two-phase inflow conditions, when the circumferential position of the short blades is close to the suction surface of the long blades, some of the bubbles on the suction surface of the long blade can be broken under the work of the pressure surface of the short blade and flow out of the impeller with the liquid, which improves the flow state of the flow field in the impeller.
Highlights
IntroductionThe centrifugal pump is an important energy conversion device and fluid transportation equipment
The centrifugal pump is an important energy conversion device and fluid transportation equipment.In engineering practice such as in chemical processes, oil and gas transportation, nuclear pump operating, loss of water accidents, etc. [1,2,3,4], the problem of gas-liquid mixed transportation with centrifugal pumps is often encountered
In scheme 2, the short blades are arranged between the two long blades, and it can be seen from the efficiency characteristic curve that the optimal working point of the centrifugal pump corresponding to the impeller is shifted to the high-flow operating point (Q/Qd = 1.1), This may be caused by the matching of the throat area of the volute with a too-large impeller vane
Summary
The centrifugal pump is an important energy conversion device and fluid transportation equipment. Binghui Pan et al [13] used the mixture model to study the influence of the gas-liquid two-phase flow on the head and efficiency of a centrifugal pump. When the circumferential arrangement positions of the splitter blades are close to the suction surface of the long blades, the low-speed area in the impeller-path increases and the flow are distributed unevenly. Jiao Yao et al [17] established a solid-liquid two-phase flow model, and compared and analyzed three numerical simulations of centrifugal pumps with splitter blades. This paper uses the Euler-Euler two-fluid model to numerically simulate the centrifugal pump under air-contenting conditions under design conditions to explore the influence of circumferential arrangement impellers with different lengths of blades under different inflow air-containing conditions. The influence of the arrangement of different short blades on the pump performance under pure water conditions is analyzed
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