Theoretical and experimental investigation of the function of the wall flow deflecting ring. A single ring

1985 ◽  
Vol 50 (12) ◽  
pp. 2685-2696 ◽  
Author(s):  
Vladimír Staněk ◽  
Krumm Semkov ◽  
Nikolai Kolev ◽  
Georgii Paskalev
Keyword(s):  
Experimental Investigation ◽  
Theoretical Model ◽  
Reasonable Agreement ◽  
Experimental Results ◽  
Single Ring ◽  
The Future ◽  
Wall Flow ◽  
Trickle Bed ◽  
Theoretical Results

Theoretical model has been formulated of the flow of liquid in a randomly packed trickle bed column equipped with special wall flow deflecting rings (WFDR). Solutions have been obtained of the model for the case of a single ring. Theoretical results have been compared with experimental distributions of liquid in a 188.6 mm in diameter column packed with 25 mm Raschig rings and equipped with a single WFDR. Reasonable agreement of the theory with experimental results has been found and the theory is felt to be important in the future for optimizations of the number, size and spacing of the WFDR's to be used in industrial columns to check the extent of the flow on the wall.

Unbalance Response of a Dual Rotor System: Theory and Experiment

1993 ◽  
Vol 115 (4) ◽  
pp. 427-435 ◽  
Author(s):  
K. Gupta ◽  
K. D. Gupta ◽  
K. Athre
Keyword(s):  
System Theory ◽  
Transfer Matrix ◽  
Mode Shape ◽  
Reasonable Agreement ◽  
Complex Variables ◽  
Rotor System ◽  
Experimental Results ◽  
Unbalance Response ◽  
Theoretical Results ◽  
Theory And Experiment

A dual rotor rig is developed and is briefly discussed. The rig is capable of simulating dynamically the two spool aeroengine, though it does not physically resemble the actual aeroengine configuration. Critical speeds, mode shape, and unbalance response are determined experimentally. An extended transfer matrix procedure in complex variables is developed for obtaining unbalance response of dual rotor system. Experimental results obtained are compared with theoretical results and are found to be in reasonable agreement.

Experimental Investigation of the Characteristics of Dynamic Cutting Process

1977 ◽  
Vol 99 (2) ◽  
pp. 410-418 ◽  
Author(s):  
M. M. Nigm ◽  
M. M. Sadek
Keyword(s):  
Experimental Investigation ◽  
Theoretical Model ◽  
High Speed ◽  
Cutting Speed ◽  
Chip Thickness ◽  
Shear Plane ◽  
Rake Angle ◽  
Experimental Results ◽  
High Speed Photography ◽  
Cutting Coefficients

The dynamic response of the shear plane and the variations of the dynamic cutting coefficients are experimentally investigated at various values of feed, cutting speed, rake angle, clearance angle, frequency, and amplitude of chip thickness modulation. Wave generating and wave removing cutting tests, in which high-speed photography is used to investigate the geometry of chip formation, are carried out. The theoretical model of dynamic cutting developed in [1] is assessed with reference to these experimental results. A comparison between this model and previous models in relation to the experimental results is also presented.

An Investigation of Nucleating Flows of Steam in a Cascade of Turbine Blading

1993 ◽  
Vol 115 (1) ◽  
pp. 128-134 ◽  
Author(s):  
F. Bakhtar ◽  
R. A. Webb ◽  
M. H. Shojaee-Fard ◽  
M. A. Siraj
Keyword(s):  
Experimental Investigation ◽  
Surface Pressure ◽  
Reasonable Agreement ◽  
Experimental Results ◽  
Pressure Measurements ◽  
Experimental Facility ◽  
Blow Down ◽  
Turbine Blading

During the course of expansion in turbines steam first supercools and then nucleates to become a wet mixture. To reproduce turbine nucleating conditions realistically requires a supply of supercooled vapor. This can be achieved under blow-down conditions and an experimental facility for such studies has been constructed. The results of the first experimental investigation of nucleating flows of steam in a cascade of nozzle blading using the equipment are presented. The experimental results presented consist of surface pressure measurements, Mach-Zehnder and shadow photography. Comparisons with theoretical solutions show reasonable agreement.

Some Consideration Regarding the Models for Collisions with Plastic Indentation

2014 ◽  
Vol 658 ◽  
pp. 161-166 ◽  
Author(s):  
Stelian Alaci ◽  
Florina Carmen Ciornei ◽  
Constantin Filote
Keyword(s):  
Experimental Data ◽  
Theoretical Model ◽  
Comparative Study ◽  
Experimental Results ◽  
Plastic Deformations ◽  
Plastic Indentation ◽  
Impact Parameters ◽  
Experimental Researches ◽  
Theoretical Results ◽  
Collision Models

The paper presents a comparative study between experimental results for a collision with plastic deformations and a theoretical model from literature. A review of collision models is briefly made and a theoretical model is selected after an analysis between theoretical results and data from experimental researches. The theoretical results are evaluated versus experimental data from laser scanned post collision indentations, for the ball-plane impact. The theoretical model requires improvements by considering additional impact parameters.

Experimental Investigation of End-Plate Connection with Cruciform Column Section

2011 ◽  
Vol 250-253 ◽  
pp. 3730-3733
Author(s):  
Poi Ngian Shek ◽  
M.Md. Tahir ◽  
Cher Siang Tan ◽  
Ahmad Beng Hong Kueh
Keyword(s):  
Experimental Investigation ◽  
Theoretical Model ◽  
Failure Modes ◽  
Failure Mechanisms ◽  
Experimental Results ◽  
Tension Zone ◽  
Initial Stiffness ◽  
End Plate ◽  
Plate Connection ◽  
The Cost

This paper presents an experimental investigation on typical end-plate connection with reduced beam-to-end plate welding, connected to cruciform column (CCUB) section. The study aims to reduce the cost of fabrication and materials. Two tests were conducted to study the behavior of the proposed connections and evaluate the failure modes, moment resistance, initial stiffness and rotational capacity of the connections. The experimental results indicated that the failure mechanisms for the tested specimens begin with the end-plate yielding followed by bolt slippage that was limited to the tension region of the joint due to the tension forces exerted through the top bolt rows. The experimental results will then be used to validate the theoretical model for the T-stub idealization of the tension zone.

Theoretical and Experimental Investigation of the Nonlinear Torsion and Extension of Initially Twisted Bars

1983 ◽  
Vol 50 (2) ◽  
pp. 321-326 ◽  
Author(s):  
A. Rosen
Keyword(s):  
Experimental Investigation ◽  
Nonlinear Equations ◽  
Cross Sections ◽  
Nonlinear Deformation ◽  
Experimental Results ◽  
Tension Force ◽  
Torsional Moment ◽  
Steel Strips ◽  
Thin Steel ◽  
Theoretical Results

A set of nonlinear equations that describe the nonlinear deformation of initially twisted bars under the influence of torsional moment and tension force, which act simultaneously, are derived. Special attention is devoted to the case of thin symmetrical cross sections and the equations appropriate to this case are shown. The linear terms of the equations, in the case of thin rectangular cross sections, are compared to solutions of the same problem, obtained by other researchers, who investigated the torsion and extension of helicoidal shells. It is shown that even for thin cross sections having large values of initial twist, the deviations between the two linear solutions are very small. To check the applicability of the theory to nonlinear regions, the theoretical results are compared to experimental results obtained during the course of the present research. The experiments include the torsion and extension of thin steel strips having rectangular cross sections. The agreement between both is very good, which proves the validity of the theory.

A Theoretical and Experimental Investigation of a Gas Operated Bearing Damper for Turbomachinery: Part II — Experimental Results and Comparison With Theory

1993 ◽  
Author(s):  
Padmanabhan Sundararajan ◽  
John M. Vance
Keyword(s):  
Experimental Investigation ◽  
High Temperature ◽  
Theoretical Model ◽  
Natural Frequency ◽  
Experimental Results ◽  
Experimental Measurements ◽  
Vibration Damper ◽  
Theoretical Predictions ◽  
Present Design ◽  
Gas Damper

Abstract This is the second of two papers describing results of a research project directed at developing a gas operated vibration damper for high temperature turbomachinery applications. This part presents the experimental measurements made on three variations of the gas damper hardware and compares them with the theoretical predictions presented in Part I. It is found that the isentropic theoretical model predicts the damper characteristics quite well. A maximum damping of 13.2 Ib-s/in was measured for a single actuator at a natural frequency of 100 hz using the present design and the results suggest that significantly higher damping levels are possible with design modifications.

Experimental Rotor Unbalance Response Using Hydrostatic Gas Lubrication

1973 ◽  
Vol 95 (4) ◽  
pp. 469-476 ◽  
Author(s):  
R. D. Dayton ◽  
M. R. Chasman
Keyword(s):  
Theoretical Model ◽  
Reasonable Agreement ◽  
Journal Bearings ◽  
Rotor Speed ◽  
Supply Pressure ◽  
Unbalance Response ◽  
Gas Lubrication ◽  
Theoretical Predictions ◽  
Theoretical Results

This paper investigates the adequacy of the theoretical model in predicting the unbalance response of a rotor supported in hydrostatic gas-lubricated journal bearings. The magnitude of experimental whirl amplitudes induced by applying various unbalances to a rotor supported in hydrostatic journal bearings were measured and compared to the theoretical predictions. Variables investigated were rotor unbalance, rotor speed, and bearing supply pressure. Reasonable agreement between the experimental and theoretical results was obtained.

Experimental Rotor Unbalance Response Using Hydrodynamic Gas Lubrication

1972 ◽  
Vol 94 (1) ◽  
pp. 74-80
Author(s):  
R. D. Dayton ◽  
M. R. Chasman
Keyword(s):  
Theoretical Model ◽  
Reasonable Agreement ◽  
Journal Bearings ◽  
Rotor Speed ◽  
Unbalance Response ◽  
Bearing Load ◽  
Gas Lubrication ◽  
Theoretical Predictions ◽  
Theoretical Results

This paper investigates the adequacy of the theoretical model in predicting the unbalance response of a rotor supported in hydrodynamic gas lubricated journal bearings. The magnitude of experimental whirl amplitudes induced by applying various unbalances to a rotor supported in hydrodynamic journal bearings were measured and compared to the theoretical predictions. Variables investigated were rotor unbalance, rotor speed, and bearing load. Reasonable agreement between the experimental and theoretical results was obtained.

Measurement of Li X-ray fluorescence production cross sections and intensity ratios of some elements at 59.54 keV

2015 ◽  
Vol 93 (10) ◽  
pp. 1057-1066 ◽  
Author(s):  
F. Akman ◽  
R. Durak ◽  
M.R. Kaçal ◽  
M.F. Turhan
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Reasonable Agreement ◽  
Production Cross ◽  
Radioactive Source ◽  
Experimental Results ◽  
X Ray ◽  
Intensity Ratios ◽  
Theoretical Results ◽  
Excitation Geometry

The Li (i = l, α, β, γ) X-ray production cross section and Lα/Ll, Lα/Lβ, Lα/Lγ, Ll/Lβ, Ll/Lγ, and Lβ/Lγ intensity ratio values for Yb, Ta, W, Hg, Tl, Pb, Bi, Th, and U have been determined using an excitation geometry at 59.54 keV incident photon energy. The measurements were performed using an Am-241 annular radioactive source and a high resolution Si(Li) detector. The experimental results of Li X-ray production cross sections and intensity ratios were compared with three different theoretical results and other available experimental results in the literature. Reasonable agreement is typically observed between the present and theoretical results.

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