Experimental Measurement of Alford’s Force in Axial Flow Turbomachinery

1984 ◽  
Vol 106 (3) ◽  
pp. 585-590 ◽  
Author(s):  
J. M. Vance ◽  
F. J. Laudadio
Keyword(s):  
Prediction Model ◽  
Experimental Measurement ◽  
High Speed ◽  
Aerodynamic Force ◽  
Axial Flow ◽  
Experimental Measurements ◽  
Test Apparatus ◽  
Rotor Speed ◽  
Flow Conditions ◽  
Flow Test

This paper presents the results of experimental measurements made on a small, high-speed, axial-flow test apparatus to verify the existence of Alford’s force and to investigate the validity of his mathematical prediction model. The measurements show that the cross-coupled aerodynamic force is linearly proportional to rotor eccentricity, and to stage torque, as predicted by Alford’s theory. However, it was found that the force is also speed-dependent, and that the inlet flow conditions to the stage have a pronounced effect. For some special combinations of rotor speed and stage torque, the direction of the force is reversed.

Research on Loading Method of High-Speed Closed Power Flow Test System

2009 ◽  
Vol 419-420 ◽  
pp. 129-132
Author(s):  
Li Quan Wang ◽  
Yong Dong An ◽  
Rong Hua Sun ◽  
Shao Jun An
Keyword(s):  
High Speed ◽  
Power Flow ◽  
Test System ◽  
Power Calculation ◽  
Flow Conditions ◽  
Loading Method ◽  
Flow Test ◽  
New Type ◽  
Loading Devices ◽  
System Power

In this paper, a new type of shaft end torque loadling device is studied for the closed power flow test system of the high-power marine reducer, and it illustrates the structure of the load device, makes the principle of analysis and power calculation of the loading device; and analyses the test system power flow conditions and anti-way self-locking of the installation, Finally, the loading devices of the test system is designed to the order of 100000 magnitude reducer, verify the feasibility of this loading method.

Prediction model of high-speed oblique cutting temperature based on LS-SVM

2015 ◽  
Vol 85 (1-4) ◽  
pp. 317-324 ◽  
Author(s):  
Feng Yong ◽  
Jia Binghui ◽  
Yan Guodong ◽  
Jia Xiaolin
Keyword(s):  
Prediction Model ◽  
High Speed ◽  
Cutting Temperature ◽  
Oblique Cutting

scholarly journals Broadband Power Line Communication for Integration of Energy Sensors within a Smart City Ecosystem

Sensors ◽  
2021 ◽  
Vol 21 (10) ◽  
pp. 3402
Author(s):  
Jan Slacik ◽  
Petr Mlynek ◽  
Martin Rusz ◽  
Petr Musil ◽  
Lukas Benesl ◽  
...  
Keyword(s):  
Smart Grids ◽  
High Speed ◽  
Power Line ◽  
Experimental Simulation ◽  
Power Line Communication ◽  
Experimental Measurements ◽  
Simulation Tool ◽  
Smart Metering ◽  
Complex Simulation ◽  
Simulation Results

The popularity of the Power Line Communication (PLC) system has decreased due to significant deficiencies in the technology itself, even though new wire installation is not required. In particular, regarding the request for high-speed throughput to fulfill smart-grid requirements, Broadband Power Line (BPLC) can be considered. This paper approaches PLC technology as an object of simulation experimentation in the Broadband Power Line Communication (BPLC) area. Several experimental measurements in a real environment are also given. This paper demonstrates these experimental simulation results as potential mechanisms for creating a complex simulation tool for various PLC technologies focusing on communication with end devices such as sensors and meters. The aim is to demonstrate the potential and limits of BPLC technology for implementation in Smart Grids or Smart Metering applications.

Improvement of Stalling Characteristics of an Axial-Flow Fan by Radial-Vaned Air-Separators

2010 ◽  
Vol 132 (2) ◽  
Author(s):  
Nobuyuki Yamaguchi ◽  
Masayuki Ogata ◽  
Yohei Kato
Keyword(s):  
Solid Wall ◽  
Axial Flow ◽  
Internal Flow ◽  
Rotor Blades ◽  
Relative Location ◽  
Flow Conditions ◽  
Axial Flow Fan ◽  
Light Load ◽  
Stall Prevention ◽  
Air Separator

An improved construction of air-separator device, which has radial-vanes embedded within its inlet circumferential opening with their leading-edges facing the moving tips of the fan rotor-blades so as to scoop the tip flow, was investigated with respect to the stall-prevention effect on a low-speed, single-stage, lightly loaded, axial-flow fan. Stall-prevention effects by the separator layout, relative location of the separator to the rotor-blades, and widths of the openings of the air-separator inlet and exit were parametrically surveyed. As far as the particular fan is concerned, the device together with the best relative location has proved to be able to eliminate effectively the stall zone having existed in the original solid-wall characteristics, which has confirmed the promising potential of the device. Guidelines were obtained from the data for optimizing relative locations of the device to the rotor-blades, maximizing the stall-prevention effect of the device, and minimizing the axial size of the device for a required stall-prevention effect, at least for the particular fan and possibly for fans of similar light-load fans. The data suggest the changing internal flow conditions affected by the device conditions.

scholarly journals EXPERIMENTS FOR EVALUATING FLOWABILITY OF FRESH CONCRETE BY USING THE INCLINED FLOW TEST APPARATUS

2012 ◽  
Vol 18 (38) ◽  
pp. 11-14 ◽  
Author(s):  
Hiroyuki SASAKURA ◽  
Yoshihiro MASUDA ◽  
Youngran LEE
Keyword(s):  
Fresh Concrete ◽  
Test Apparatus ◽  
Flow Test ◽  
Inclined Flow

A Method of Making High-Speed Compression Tests on Small Copper Cylinders

1948 ◽  
Vol 15 (3) ◽  
pp. 248-255
Author(s):  
E. T. Habib
Keyword(s):  
High Speed ◽  
Underwater Explosion ◽  
Dynamic Calibration ◽  
Test Apparatus ◽  
Compression Tests ◽  
High Speeds

Abstract In mechanical gages used to measure the pressure from an underwater explosion, small copper cylinders are compressed at high speeds. This paper describes the test apparatus designed for the dynamic calibration of these cylinders, presents the results obtained with this apparatus, and compares these results with those obtained by other experimenters.

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