Internal Flow Analysis on Sweeping Jet Actuator

2019 ◽  
Author(s):  
Sushanth Gowda B C ◽  
Vinuth N ◽  
Poornananda T ◽  
Dhanush G J, ◽  
T Paramesh
Keyword(s):  
Flow Analysis ◽  
Internal Flow

Internal Flow Analysis in a Two-Channel Pump Used for Salt Transportation

2018 ◽  
Author(s):  
Jiaqi Wang ◽  
Xianwu Luo ◽  
Wanming Li ◽  
Bin Ji
Keyword(s):  
Particle Concentration ◽  
Flow Analysis ◽  
Internal Flow ◽  
Leading Edge ◽  
Pressure Side ◽  
Operation Condition ◽  
Static State ◽  
Erosion Risk ◽  
Salt Particle ◽  
Blade Leading Edge

Two-channel pumps usually have very complicated flow field due to the special impeller geometry. The present paper treats the internal flow analysis based on numerical simulation so as to investigate the pumping performance and passage erosion for a two-channel centrifugal pump used for transporting salt particles. The static state flows are calculated by applying RANS method and k-omega SST turbulence model. The numerical results indicate that there are strong circulation flows near the impeller inlet and blade pressure side, and zones with high turbulent kinetic energy near impeller exit when the pump is operated under the designed flow rate i.e. Qd. Pressure decay is also found at the rear part of blade pressure side. At the operation condition of 1.3Qd, the internal flow becomes better. Further, the numerical analysis based on Eulerian-Lagrangian method shows the trajectory of salt particle, salt particle concentration and erosion rate in the pump. It is noted that the salt particles go smoothly in the flow passage due to the large section size of the pump, and there is severe erosion at the blade leading edge and the wall of volute casing due to strong impingement and high particle concentration. Thus, these areas such as blade leading edge and the wall of volute casing are the zones with high erosion risk in the two-channel pump.

Unsteady Flow Simulations of a Transonic Nozzle and Cascade for a Time-Dependent Boundary Flow

2002 ◽  
Author(s):  
Erdal Turkbeyler
Keyword(s):  
Shock Wave ◽  
Unsteady Flow ◽  
Flow Analysis ◽  
Internal Flow ◽  
Wave Mode ◽  
Accurate Solution ◽  
Single Step ◽  
Integration Scheme ◽  
Inlet Flow ◽  
Flow Fluctuations

In this study we investigate unsteady compressible internal flow caused by flow fluctuations at an inlet or outlet flow-boundary. A finite-volume time-marching method has been developed for the unsteady flow analysis. This paper presents the proposed method and reports the results of a numerical investigation into the effects of a time-varying back pressure to a two-dimensional transonic nozzle and of a pulsating inlet flow to a transonic three-dimensional cascade of tapered blades. The computational model is based on a solution of the unsteady Euler equations for compressible flow. The time accurate solution is advanced by an explicit single-step second order time integration scheme. It has been found that the flow fluctuations at flow boundaries can cause strong unsteady effects on the operation of nozzles and cascades. Two modes of operation have been predicted for the unsteady flow in the nozzle: an upstream moving shock wave (mode-A) and an oscillating shock wave (mode-B). The results for the cascade have shown that the pulsating inlet flow causes the shock wave to originate, to move upstream and weaken over the period; the supersonic region on the blade surface varies continuously. The instantaneous mass flow rates and shock motions have been determined for them; they are important for their design and performance calculations.

Internal Flow Analysis on an Open Ducted Cross Flow Turbine with Very Low Head

2014 ◽  
Vol 17 (5) ◽  
pp. 67-71
Author(s):  
Qingsheng Wei ◽  
Yeong-Cheol Hwang ◽  
Young-Do Choi
Keyword(s):  
Flow Analysis ◽  
Cross Flow ◽  
Internal Flow ◽  
Low Head

2432 Internal Flow Analysis of Low Specific Speed Centrifugal Pump with Circular Casing

2006 ◽  
Vol 2006.2 (0) ◽  
pp. 183-184
Author(s):  
Jun MATSUI ◽  
Junichi KUROKAWA ◽  
Kouichi NISHINO ◽  
Young-Do Choi ◽  
Kouichi MOURI
Keyword(s):  
Centrifugal Pump ◽  
Flow Analysis ◽  
Internal Flow ◽  
Low Specific Speed ◽  
Specific Speed

Simulations of micropolar nanofluid-equipped natural convective-driven flow in a cavity

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Naeem Ullah ◽  
Sohail Nadeem ◽  
Luthais McCash ◽  
Anber Saleem ◽  
Alibek Issakhov
Keyword(s):  
Flow Analysis ◽  
Internal Flow ◽  
Viscosity Coefficient ◽  
Mathematical Framework ◽  
Flow Profile ◽  
Content Type ◽  
Contour Maps ◽  
Linear Partial Differential Equations ◽  
Micropolar Nanofluid ◽  
Heated Source

Purpose This paper aims to focus on the natural convective flow analysis of micropolar nanofluid fluid in a rectangular vertical container. A heated source is placed in the lower wall to generate the internal flow. In further assumptions, the left/right wall are kept cool, while the upper and lower remaining portions are insulated. Free convection prevails in the regime because of thermal difference in-between the lower warmer and upper colder region. Design/methodology/approach The physical setup owns mathematical framework in-terms of non-linear partial differential equations. For the solution purpose of the differential system, finite volume method is adopted. The interesting features of the flow along with thermal transportation involve both translational and rotational movement of fluid particles. Findings Performing the simulations towards flow controlling variables the outputs are put together in contour maps and line graphs. It is indicated that the variations in flow profile mass concentration and temperature field augments at higher Rayleigh parameter because of stronger buoyancy effects. Higher viscosity coefficient implies decrease in flow and thermal transportation. Further, the average heat transfer rate also grows by increasing both the Rayleigh parameter and heated source length. Originality/value To the best of the authors’ knowledge, no such study has been addressed yet. Further, the results are validated by comparing with previously published work.

Aerodynamic Optimization Design of a Turbocharger Compressor Impeller

2012 ◽  
Vol 455-456 ◽  
pp. 389-394
Author(s):  
Chun Jun Ji ◽  
Xiao Qing Li
Keyword(s):  
Optimization Design ◽  
Flow Analysis ◽  
Internal Flow ◽  
Design Parameters ◽  
Trial And Error ◽  
Aerodynamic Optimization ◽  
Compressor Impeller ◽  
Final Design ◽  
Compressor Performance ◽  
Design Software

The flow inside the impeller and diffuser of a turbocharger compressor was analyzed numerically in this paper. The results indicate that the internal flow is disturbed and efficiency is low. There exists a big vortex in the diffuser which dissipates a large amount of energy. Based on the commercial design software, different design parameters were optimized by trial-and-error. Numerical flow analysis results of the final design show that the efficiency is increased by 6.26% and internal flow is improved greatly. It can be concluded that the meridian radius of the impeller flow path has great effect on the compressor performance.

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