Performance Evaluation of a Regenerative Pump of Small Size

2004 ◽  
Author(s):  
Shin-Hyoung Kang ◽  
Hyung-Soo Lim ◽  
Su-Hyun Ryu
Keyword(s):  
Three Dimensional ◽  
Flow Simulation ◽  
Side Channel ◽  
Complex Flow ◽  
Momentum Exchange ◽  
Leakage Loss ◽  
Flow Rates ◽  
Viscous Losses ◽  
Performance Reduction ◽  
And Performance

Performance of a regenerative pump for automobile was tested and carefully corrected to obtain performance of the pump. Flow calculations are also performed in one vane to vane region of the impeller and side channel. Corrections of leakage loss and performance reduction in the transient regions at the inlet and outlet are discussed in the study. The calculated values are good coincident with the measured and corrected values near the design and high flow rates. The flow is very complex three dimensional with a strong radial vortex due to centrifugal force and an axial vortex due to re-circulating flow between the impeller and the side channel. Momentum exchange on the plane between the impeller and the side channel are evaluated to estimate viscous losses in the pump. The present study contributes to showing the capability of flow simulation of complex flow in the regenerative pump by comparing the calculated performance with the measured value.

Detailed Three-Dimensional Velocity Field Measurements of a Complex Internal Cooling Flow Within a Gas Turbine Vane

2019 ◽  
Author(s):  
Michael J. Benson ◽  
David Helmer ◽  
Bret P. Van Poppel ◽  
Benjamin Duhaime ◽  
David Bindon ◽  
...  
Keyword(s):  
Gas Turbine ◽  
Three Dimensional ◽  
Leading Edge ◽  
Scale Model ◽  
Internal Cooling ◽  
Complex Flow ◽  
Copper Sulfate Solution ◽  
Flow Rates ◽  
Experimental Apparatus ◽  
Turbine Vane

Abstract A 6.67 scale model of the Advanced Recirculation Total Impingement Cooling (ARTIC) gas turbine vane insert’s leading edge was designed, built using stereolithography (SLA) fabrication methods, and tested using Magnetic Resonance Velocimetry (MRV), a non-invasive data acquisition technique that captures three-dimensional, three-component velocity fields of a copper sulfate solution over the course of several hours. The experimental apparatus supplied constant flow rates through a test section placed within a 3.0 Tesla MRI magnet. Tests were run at two fully turbulent flow rates corresponding to Reynolds numbers based on hydraulic diameter of 10,000 and 20,000 with the higher flow rate case achieving dynamic similarity with the full-scale ARTIC device. The experimental results elucidated key details and intricacies of the complex flow within the insert. Analysis of flow distribution between each of the three independent impingement zones revealed a degree of measurable jet to jet variability. Stagnation and recirculation zones were detected, informing design modifications and enabling assessment of inlet effects on impingement. Measurement uncertainty was assessed and estimated to be approximately 7.5% of the peak velocity at the inlet to the central feed cavity.

Analysis on the Inhomogeneity of Air Intake and Retrofit Optimization of the Air Intake Pipe in the Engine T12V190

2014 ◽  
Vol 635-637 ◽  
pp. 7-12
Author(s):  
Xiao Jie Li ◽  
Zhong Yu Zhao ◽  
Yu Tian Pan
Keyword(s):  
Flow Field ◽  
Three Dimensional ◽  
Three Dimension ◽  
Intake Pipe ◽  
Performance Reduction ◽  
Cavity Structure ◽  
Air Intake ◽  
Dimensional Simulation ◽  
And Performance ◽  
Retrofit Design

Taking the air intake pipe in the engine as the target of the research, the software STAR-CDE is adopted to build a three-dimensional simulation model for the air intake pipe in the engine T12V190 with the aim to solve the problems of air input deficiency, Combustion deterioration and performance reduction of one cylinder caused by the non-uniformity. Moreover, the non-uniformity of the flux of air intake of the air intake pipe is mainly studied and analyzed through a calculation on the CFD of the inner flow field of the three dimension of the air intake pipe in the engine T12V190. In addition, a retrofit design with multiple schemes is made based on the cavity structure of the original mold for the air intake pipe. Finally, through a comparison among the three selected designs, a more feasible retrofit designing scheme and a designing thought on the air intake pipe in the engine with directional significance are got.

Compressor Volute Design System: Part I — Volute Design by Bezier Application

2002 ◽  
Author(s):  
Guy Phuong ◽  
Sylvester Abanteriba ◽  
Paul Haley
Keyword(s):  
System Approach ◽  
Three Dimensional ◽  
Flow Simulation ◽  
Design System ◽  
Centrifugal Compressors ◽  
Output Data ◽  
B Spline ◽  
Actual Design ◽  
System Part ◽  
And Performance

This is Part I of a two-part paper describing a new compressor volute design system, which is applied to an interactive program that completely describes volute geometry and its interactions with CFD. Part I goes into the theory behind the program and the design of the volute geometry by application of Bezier polynomials while Part II fully describes the actual design system approach and its application to the program. Based on the developed mathematics of B-spline and Bezier polynomials, the present paper further develops the extent of Bezier polynomials by application of Bezier to volute design. Bezier polynomials will be used to describe and define volute geometry for centrifugal compressors with the objective of serving as an aid for volute design and performance analysis. The current research aims to develop an algorithm for volute design that will enable the volute geometry, to be fully described and viewed, in two-dimensional (2D) and three-dimensional (3D) modes. A program based on this algorithm will deliver output data for grid generation and CFD flow simulation and eventual manufacture of the volute. These procedures will be developed for a family of centrifugal compressors.

Pumping Performance of a Valveless Micropump Using Three-Dimensional Electro-Fluid-Structural Interaction Simulation

2008 ◽  
Author(s):  
Van Phuoc Phan ◽  
Nam Seo Goo ◽  
Cheol Heui Han
Keyword(s):  
Three Dimensional ◽  
Flow Simulation ◽  
Structural Domain ◽  
Flow Rates ◽  
Structural Part ◽  
Valveless Micropump ◽  
Ansys Cfx ◽  
Interaction Simulation ◽  
Dimensional Simulation ◽  
Diffuser Angle

In this study, the pumping performance of a piezoelectric valveless micropump is simulated. The micropump, which was developed in the previous work, is composed of a four-layer lightweight piezocomposite actuator, a polydimethylsiloxane (PDMS) pump chamber, and two diffusers. The piezoelectric domain, the structural domain and the fluid domain are coupled in the three-dimensional simulation. For structural part, we used ANSYS. The fluid flow simulation is done with ANSYS CFX. The water flow rates are numerically predicted for geometric parameters of the micropump such as diffuser length and diffuser angle. The simulation is also verified with the experiment and the simulation results are acceptable for predicting the pumping performance.

Effects of Blade-End Open Ratio on Aerodynamic Performance of Multi-Blade Fan

2012 ◽  
Author(s):  
Ho Ho Lee ◽  
Hang Cheol Choi ◽  
Jae Gu Jung ◽  
Yoon Pyo Lee ◽  
Youhwan Shin ◽  
...  
Keyword(s):  
Flow Behavior ◽  
Three Dimensional ◽  
Numerical Results ◽  
Separated Flows ◽  
Test Rig ◽  
Complex Flow ◽  
Three Dimensional Flow ◽  
Commercial Code ◽  
Internal Loss ◽  
And Performance

This paper is studied to the performance characteristics and the flow behavior of multi-blade fan according to blade-end open-ratio (k) of near the shroud side. Firstly, the properties related to performance of the fan have been measured in a test rig. In the next, numerical calculations are conducted to explain the complex, three-dimensional flow behavior and performance of the fan using CFX 12.0 commercial code. The validation of numerical results has been performed in comparison with the experimental results. The numerical results provide a comprehensive understanding of the flow behavior inside the fan. By changing the open ratio of blade-end near the shroud side, the flow behavior and inactive zone is respectively different. The separated flows are strongly occurred in a blade passage and the inactive zones are formed near the shroud as k = 0 and 20% cases, relatively. The flow separation and inactive zone reduce fan’s efficiency because they cause internal loss. The best efficiency and flow behavior of the fan is appeared to be at k = 70% case. According to open ratio of blade-end near shroud side, the flow behavior can be changed and the efficiency of a fan can be increasing. The objective of this study is to understand of the complex flow behavior inside the fan and offer guidance for fan designing.

Mixing Quality Improvement of a Coaxial Syngas Mixer by Adding Optimized Mechanical Tabs Using Three-Dimensional CFD Modeling

2014 ◽  
Vol 699 ◽  
pp. 429-434
Author(s):  
Dominicus Danardono ◽  
Ki Seong Kim
Keyword(s):  
Quality Improvement ◽  
Aspect Ratio ◽  
Pressure Loss ◽  
Computational Models ◽  
Three Dimensional ◽  
Cfd Modeling ◽  
Flow Rates ◽  
Mixing Performance ◽  
Mixing Quality ◽  
And Performance

A coaxial gas mixer is designed for mixing air and synthesis gas or syngas as fuel. Three-dimensional computational models are harnessed to analyze and predict the influence of the mechanical tabs aspect ratio and number on the mixing characteristics and performance of the gas mixer. Attention is concentrated on the influence of mechanical tabs on the air-fuel ratio, pressure loss and mixing quality. The optimum design of the mechanical tab was realized with aspect ratio of 0.32 and 4 tabs with 45o tab angle. The coaxial gas mixer using the optimized mechanical tabs was realized with λ of 1.13 corresponding to pressure loss of 37.2 Pa at 100 m3/h air-flow rates and the coefficient of variation (CoV) of mixing was 0.29. The gas mixer with the mechanical tabs had much better mixing performance than the gas mixer without mechanical tabs with only relatively small increase in pressure loss.

Development of a Throughflow Method for Aerodynamic Analysis of Highly Loaded Axial Flow Compressors

2015 ◽  
Author(s):  
Bo Li ◽  
Chun-wei Gu ◽  
Xiao-tang Li ◽  
Tai-qiu Liu ◽  
Yao-bing Xiao
Keyword(s):  
Three Dimensional ◽  
Axial Flow ◽  
Internal Flow ◽  
Momentum Exchange ◽  
Viscous Shear ◽  
Multistage Compressors ◽  
And Performance ◽  
Energy And Momentum ◽  
Reliability And Robustness ◽  
Highly Loaded

In this paper, a novel engineering platform for throughflow analysis based on streamline curvature approach is developed for the research of a 5-stage compressor. It includes several types of improved loss and deviation angle models for the purpose of reflecting the influences of three-dimensional internal flow in highly loaded multistage compressors with higher accuracy. A spanwise mixing model considering viscous shear force with a no-slip condition is applied to improve assessment about the substantial amounts of radial energy and momentum exchange, a shock model accounting for shock geometry changes is also contained to better simulate transonic flow near the tip regions. In order to validate the reliability and robustness of the method, series of test cases including a subsonic compressor P&W 3S1, a transonic rotor NASA Rotor 1B and especially an advanced high pressure core compressor GE E3 HPC have been conducted. Then the computation procedure is applied to the research of a 5-stage compressor which is designed for developing an industry gas turbine. The overall performance and aerodynamic configuration predicted by the procedure both at design- and part-speed conditions are analyzed and compared with experimental results, which show a good agreement. The throughflow method is verified as a reliable and convenient tool for aerodynamic design and performance prediction of modern highly loaded compressors. It is also qualified for further optimization of the 5-stage compressor.

Digitalization system of ancient architecture decoration art based on neural network and image features

2020 ◽  
pp. 1-12
Author(s):  
Wu Xin ◽  
Qiu Daping
Keyword(s):  
Neural Network ◽  
Construction Industry ◽  
Three Dimensional ◽  
Performance Testing ◽  
Image Features ◽  
Three Dimensional Model ◽  
Performance Effect ◽  
Data Process ◽  
And Performance ◽  
Construction Mode

The inheritance and innovation of ancient architecture decoration art is an important way for the development of the construction industry. The data process of traditional ancient architecture decoration art is relatively backward, which leads to the obvious distortion of the digitalization of ancient architecture decoration art. In order to improve the digital effect of ancient architecture decoration art, based on neural network, this paper combines the image features to construct a neural network-based ancient architecture decoration art data system model, and graphically expresses the static construction mode and dynamic construction process of the architecture group. Based on this, three-dimensional model reconstruction and scene simulation experiments of architecture groups are realized. In order to verify the performance effect of the system proposed in this paper, it is verified through simulation and performance testing, and data visualization is performed through statistical methods. The result of the study shows that the digitalization effect of the ancient architecture decoration art proposed in this paper is good.

Sea Urchins and Circuses: The Modernist Natural Histories of Jean Painlevé and Alexander Calder

2018 ◽  
Vol 13 (2) ◽  
pp. 187-211
Author(s):  
Patricia E. Chu
Keyword(s):  
New Media ◽  
Sea Urchins ◽  
Life Sciences ◽  
Three Dimensional ◽  
Machine Age ◽  
Avant Garde ◽  
History Of ◽  
And Performance ◽  
The One ◽  
Natural Historian

The Paris avant-garde milieu from which both Cirque Calder/Calder's Circus and Painlevé’s early films emerged was a cultural intersection of art and the twentieth-century life sciences. In turning to the style of current scientific journals, the Paris surrealists can be understood as engaging the (life) sciences not simply as a provider of normative categories of materiality to be dismissed, but as a companion in apprehending the “reality” of a world beneath the surface just as real as the one visible to the naked eye. I will focus in this essay on two modernist practices in new media in the context of the history of the life sciences: Jean Painlevé’s (1902–1989) science films and Alexander Calder's (1898–1976) work in three-dimensional moving art and performance—the Circus. In analyzing Painlevé’s work, I discuss it as exemplary of a moment when life sciences and avant-garde technical methods and philosophies created each other rather than being classified as separate categories of epistemological work. In moving from Painlevé’s films to Alexander Calder's Circus, Painlevé’s cinematography remains at the forefront; I use his film of one of Calder's performances of the Circus, a collaboration the men had taken two decades to complete. Painlevé’s depiction allows us to see the elements of Calder's work that mark it as akin to Painlevé’s own interest in a modern experimental organicism as central to the so-called machine-age. Calder's work can be understood as similarly developing an avant-garde practice along the line between the bestiary of the natural historian and the bestiary of the modern life scientist.

Electrical Capacitance Volume Tomography (ECVT) for industrial and medical applications-An Overview

2015 ◽  
Vol 11 (1) ◽  
pp. 2897-2908
Author(s):  
Mohammed S.Aljohani
Keyword(s):  
Imaging Technique ◽  
Three Dimensional ◽  
Biological Processes ◽  
Electrical Capacitance ◽  
Image Reconstruction Techniques ◽  
Phase Dynamics ◽  
Non Invasive ◽  
Electrical Capacitance Volume Tomography ◽  
And Performance ◽  
Optimization And Performance

Tomography is a non-invasive, non-intrusive imaging technique allowing the visualization of phase dynamics in industrial and biological processes. This article reviews progress in Electrical Capacitance Volume Tomography (ECVT). ECVT is a direct 3D visualizing technique, unlike three-dimensional imaging, which is based on stacking 2D images to obtain an interpolated 3D image. ECVT has recently matured for real time, non-invasive 3-D monitoring of processes involving materials with strong contrast in dielectric permittivity. In this article, ECVT sensor design, optimization and performance of various sensors seen in literature are summarized. Qualitative Analysis of ECVT image reconstruction techniques has also been presented.

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