Design, Validation and Application of a Radial Cascade for Centrifugal Compressors

2008 ◽  
Author(s):  
Alexander Simpson ◽  
Christian Aalburg ◽  
Michael Schmitz ◽  
Robbert Pannekeet ◽  
Florian Larisch ◽  
...  
Keyword(s):  
Design Space ◽  
Three Dimensional ◽  
Measurement Data ◽  
Test Results ◽  
Pressure Loading ◽  
Test Rig ◽  
Three Dimensional Flow ◽  
Blow Down ◽  
Operation Conditions ◽  
Flow Pressure

A novel sector test rig has been used to evaluate a new airfoil concept for multistage radial compressors. The test rig is supported by a blow-down facility where the operation conditions are adjusted by controlling mass flow, pressure and temperature. At inlet to the sector test rig itself a set of adjustable inlet guide vanes provide the test vanes with the correct inlet three-dimensional flow-field. The rig is equipped with instrumentation to allow a detailed description of the inlet and outlet conditions, as well as the blade pressure loading. This rig, using rapid prototyped vanes, allows design candidates to be screened quickly and is ideal for conducting an experimental investigation of a design space using a Design-of-Experiments approach. In this paper the rationale for the sector approach is described, the design of the test rig with 3D-CFD methods is outlined and a detailed validation of the rig is presented. For the vane in question detailed investigations of different operation points close to stall are reported, blade pressures and inlet and exit flow profiles are given. Where applicable, measurement data from the sector rig was compared to 3D-CFD calculations of the full annulus multistage configuration, to 3D-CFD calculations of the sector rig itself and to the test results from a 1.5-stage rotating test rig. The measurement data are compared to the CFD predictions and served as a calibration basis for the design tools.

Performance Investigations of Large Capacity Centrifugal Compressors

1978 ◽  
Author(s):  
H. Mishina ◽  
I. Gyobu
Keyword(s):  
Pressure Ratio ◽  
Flow Analysis ◽  
Three Dimensional ◽  
Design Procedure ◽  
Test Results ◽  
Three Dimensional Flow ◽  
Loss Analysis ◽  
Area Distribution ◽  
Specific Speed ◽  
Sectional Shape

An experimental investigation concerning the optimum relative velocity distribution within impellers, the optimum diffusion ratio of vaned diffusers and the optimum circumferential area distribution, sectional shape of scrolls was carried out using high specific speed shrouded impellers with backward leaning blades. A performance design procedure based on loss analysis and quasi-three-dimensional flow analysis was also developed and modified by introducing experimental results. The design procedure was applied to a 7900-kw four-stage air compressor to demonstrate the usefulness. Field test results of the complete machine showed that the maximum isothermal efficiency was 75 percent with the pressure ratio of 5.96 and the flow rate of 29.3 m3/s.

scholarly journals Mathematical Modelling of Biomechanical Interactions between Backpack and Bearer during Load Carriage

2013 ◽  
Vol 2013 ◽  
pp. 1-12
Author(s):  
Lei Ren ◽  
David Howard ◽  
Richard K. Jones
Keyword(s):  
Mathematical Model ◽  
Mathematical Modelling ◽  
Equations Of Motion ◽  
Three Dimensional ◽  
Measurement Data ◽  
Load Carriage ◽  
Human Gait ◽  
Test Rig ◽  
Interaction Forces ◽  
Suspension Model

This paper proposes a three-dimensional mathematical model of the biomechanical interactions between backpack and bearer during load carriage. The model considers both the coupled pack motions, which follow the torso, and also the longitudinal compliance and damping in the backpack suspension. The pack interaction forces and moments, acting on the bearer, are determined from kinematic relationships, equations of motion, and a dynamic pack suspension model. The parameters of the pack suspension model were identified from test data obtained using a load carriage test rig. Output from the load carriage mathematical model has been compared with measurement data during human gait and conclusions drawn with regard to the validity of the proposed approach.

Numerical Simulation and Experimental Study on Hydraulic Performance of Centrifugal Pump's Impeller Based on FINE

2013 ◽  
Vol 444-445 ◽  
pp. 390-394
Author(s):  
Yong Shang ◽  
Xiao Bing Liu ◽  
Xue Jun Yu
Keyword(s):  
Numerical Simulation ◽  
Centrifugal Pump ◽  
Flow Rate ◽  
Flow Analysis ◽  
Three Dimensional ◽  
Hydraulic Performance ◽  
Test Results ◽  
Turbulent Model ◽  
Three Dimensional Flow ◽  
Dimensional Flow

By using the FINE software developed by NUMECA Company, the hydraulic performance of the impeller of a centrifugal pump with spatial guide vanes was numerically simulated. The S-A turbulent model was used to numerically calculate the three-dimensional flow field in the centrifugal pump under three different conditions. The flow analysis shows that the pressure gradient on the vane surface gradually reduces with the increasing of the flow rate; the position of axial vortex between vanes has nothing to do with the flow rate; the tangential flow gradient in the flow passage decreases with the increasing of the flow rate. Compared with the test results, it is obvious that this numerical simulation can accurately predicate the complicated three-dimensional flow and the hydraulic performance of the pump.

Application of Flow Control in a Novel Sector Test Rig

2013 ◽  
Vol 136 (4) ◽  
Author(s):  
Alexander Simpson ◽  
Christian Aalburg ◽  
Michael B. Schmitz ◽  
Robbert Pannekeet ◽  
Vittorio Michelassi ◽  
...  
Keyword(s):  
Flow Control ◽  
Numerical Study ◽  
Three Dimensional ◽  
Test Rig ◽  
Blow Down ◽  
Radial Compressor ◽  
Injection Flow ◽  
The Matrix ◽  
Return Channel ◽  
Formed Part

An experimental and numerical study has been performed to evaluate the effectiveness of steady injection flow control for the reduction of losses in the return channel of a radial compressor. This investigation formed part of an overall attempt to develop a strategy for reducing the diffusion ratio of radial compressors. It is envisaged that this flow control would be activated at off-design conditions, where separation levels on the return channel vanes are considerable. A novel radial compressor sector test rig, supported by a blow-down facility and equipped with a range of instrumentation, was used for the experimental portion of the study. This allowed multiple flow control configurations to be studied in a simplified environment. A set of exchangeable, inlet guide vanes provide the test vanes with the correct inlet three-dimensional flow-field, while airfoil static pressure taps allowed the blade loading to be assessed. The numerical portion of the study was conducted using 3D-computational fluid dynamics (CFD) and involved simulations of both the sector test rig and a “substitute system”. In this paper, the rationale for the inclusion of flow control in a radial compressor return channel is discussed. The sector test rig is then described, including the implementation of flow control. The results of the matrix of flow control experiments are then discussed with comparison to the numerical results.

scholarly journals The accelerated laboratory test of biodegradable fluid type “ertto”

2010 ◽  
Vol 56 (No. 1) ◽  
pp. 18-25 ◽  
Author(s):  
Z. Tkáč ◽  
R. Majdan ◽  
Š. Drabant ◽  
J. Jablonický ◽  
R. Abrahám ◽  
...  
Keyword(s):  
Test Results ◽  
Fluid Type ◽  
Pressure Loading ◽  
Test Device ◽  
Operation Conditions ◽  
Limit Value ◽  
Transmission Oil ◽  
Environmentally Responsible ◽  
Short Time

The accelerated laboratory tests can evaluate the properties of new biodegradable fluids under relatively short time. These test results are the ground for the continuity of the tests under operation conditions in machine. The paper presents the test of new biodegradable hydraulic fluid type “Environmentally responsible tractor transmission oil” by designed special test device. The test evaluation was realized by technical state of concrete hydrostatic pump UD 25 which is used in tractors Zetor Forterra. This pump was loaded by cyclic pressure loading during the test with tested fluid. The evaluated parameter was flow efficiency of hydrostatic pump which reached the value 7.3% after the test. The reached value hints a high quality of the tested fluid (the limit value per standard is the flow efficiency decrease – 20%).

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.

Application of Flow Control in a Novel Sector Test Rig

2009 ◽  
Author(s):  
Alexander Simpson ◽  
Christian Aalburg ◽  
Michael Schmitz ◽  
Robbert Pannekeet ◽  
Florian Larisch ◽  
...  
Keyword(s):  
Flow Control ◽  
Numerical Study ◽  
Three Dimensional ◽  
Test Rig ◽  
Blow Down ◽  
Radial Compressor ◽  
Injection Flow ◽  
The Matrix ◽  
Return Channel ◽  
Formed Part

An experimental and numerical study has been performed to evaluate the effectiveness of steady injection flow control for the reduction of losses in the return channel of a radial compressor. This investigation formed part of an overall attempt to develop a strategy for reducing the diffusion ratio of radial compressors. It is envisaged that this flow control would be activated at off-design conditions where separation levels on the return channel vanes are considerable. A novel radial compressor sector test rig, supported by a blow-down facility and equipped with a range of instrumentation, was used for the experimental portion of the study. This allowed multiple flow control configurations to be studied in a simplified environment. A set of exchangeable, inlet guide vanes provide the test vanes with the correct inlet three-dimensional flow-field whilst airfoil static pressure taps allowed the blade loading to be assessed. The numerical portion of the study was conducted using 3D-CFD and involved simulations of both the sector test rig and a “substitute system”. In this paper the rationale for the inclusion of flow control in a radial compressor return channel is discussed. The sector test rig is then described including the implementation of flow control. The results of the matrix of flow control experiments are then discussed with comparison to the numerical results.

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