Tip clearance inevitably exists in helico-axial flow multiphase pumps, which generates a great impact on characteristics. To select reasonable tip and improve the transporting efficiency, different clearances (Rtc = 0.5, 1.0, 1.5 mm) are chosen to investigate behaviors hydraulic Based shear stress transport k-ω turbulence model, unsteady Reynolds averaged Navier–Stokes equations applied solve f...

tracheomegaly or tracheobronchomegaly is a rare syndrome which is characterized by dramatic dilatation of the trachea and the major bronchi. this syndorme is usually associated with chronic respiratory infection and airway obstruction. in this paper, a case with tracheomegaly and bronchiectasis was scrutinized.

We investigated the interaction of 2,4,6-triiodophenol (TIP), a potent thyroid hormone disrupting chemical, with serum proteins from rainbow trout (Onchorhynchus mykiss), bullfrog (Rana catesbeiana), chicken (Gallus gallus), pig (Sus scrofa domesticus), and rat (Rattus norvegicus) using a [(125)I]TIP binding assay, gel filtration chromatography, and native polyacrylamide gel electrophoresis. [(...

A large-eddy simulation (LES) solver which combines an immersed-boundary technique with a curvilinear structured grid has been developed to study the temporal and spatial dynamics of a rotor tip-clearance flow, with the objective of determining the underlying mechanisms for low pressure fluctuations downstream of the rotor near the endwall. Salient feature of the numerical methodology, includin...

This paper investigates the effect of inserting a ring type barrier on leakage flow of brush seals with different bristles clearances (the distance between bristle pack tip and rotor surface). The ring is placed on both upstream and downstream sides of the bristles. An axisymmetric CFD model is employed to calculate radial pressure distribution along backing plate, axial pressure variation on r...

The tip-clearance flow in axial turbomachines is studied using large-eddy simulation with particular emphasis on understanding the underlying mechanisms for viscous losses in the end-wall region and the unsteady characteristics of the tipleakage vortical structures. Systematic and detailed analysis of the mean flow field and turbulence statistics has been made in a linear cascade with a moving ...

A pump-jet, which is generally and widely adopted on underwater vehicles for applications from deep sea exploration to mine clearing, consists of a rotor, stator, duct, with the properties high critical speed, propulsion efficiency, great anti-cavitation performance, low radiated noise. The complex interaction flow field between various components degree coupling appendage result in requirement...