Working process study of a novel scroll type multiphase pump for the transportation of gas-liquid mixtures

Abstract

A novel scroll type multiphase pump was proposed to transport gas-liquid two-phase mixture. There is a pressure unloading gap from compression chambers to the discharge port by constructing scroll wrap profile with variational meshing clearance in this scroll multiphase pump. In the working process when the volume of working chamber decreases, the pressure of gas-liquid mixtures increases gradually, at the same time small amounts of gas-liquid mixture are pushed to the discharge port from compression chambers through the pressure unloading gap. Therefore, this multiphase pump has an advantage of unloading pressure method automatically, and the frequently problem of liquid impacting in volume multiphase pump is solved. The safety and reliability of volumetric multiphase pump are improved, and the scope of multiphase pump of the gas-liquid ratio is expanded. The working process and the performance characteristics of scroll multiphase pump were analyzed too, and the generation method of scroll wrap profile with variational meshing clearance was investigated. The equations of the profile were obtained, and the changing principle of the working volume and the meshing clearance were analyzed. The geometric theory of scroll multiphase pump was formed. All of that lay the theoretical foundation for engineering design of this novel scroll.

Analysis and numerical simulation of a novel gas–liquid multiphase scroll pump

“…Because the multiphase scroll pump has only recently been proposed [13,14], no such device currently exists; and, thus, no experimental data are available to verify the computed results of this study, as alluded to above. The results can help to develop this novel multiphase scroll pumps.…”

“…1, the multiphase scroll pump consists of fixed scroll, orbiting scroll, frame, crankshaft, anti-rotation mechanism, bearing and balance weight [13,14], etc. The fixed scroll and orbiting scroll are assembled with a relative rotation angle of 180°( p rad), and offset by a distance which equals the radius of the crankshaft, so that they can form a series of crescent-shaped working chambers.…”

“…The range of constant a is 0 6 a 6 0:028 for the case of t s = 247.6°, R b = 3.6606 mm and a ¼ 43 . It can be seen that bigger value of a will result in bigger flank clearance d [13,14]. So it is important to choose appropriate value of a for the scroll wrap profiles.…”

Numerical analysis on the cavitation and unsteady flow in a scroll hydraulic pump

“…Nowadays, the technology of computer fluid dynamics (CFD) has been applied in scroll compressor [9,10] , and can help the researchers to obtain more accurate pressure and temperature values in the working chamber. However, the CFD has merely been used in the scroll pump.…”

Novel structured dynamic mesh generation for CFD analysis of scroll compressors

“…Vande et al 11 developed a Laplacian-based mesh generator in rotary volumetric pumps and compressors. Wang et al [12][13][14] employed an unstructured dynamic mesh for numerical simulations of transient flow of scroll compressors. However, the unstructured mesh has a disadvantage of small amount of meshes (sometimes only one layer of meshes) in the flank clearance, which may lead to inaccurate simulation results.…”