Dynamic Behavior of Solid Particles Suspended by Polluted Flow in a Turbine Stage

1973 ◽  
Vol 10 (7) ◽  
pp. 434-440 ◽  
Author(s):  
M. Fathy Hussein ◽  
W. Tabakoff
Keyword(s):  
Dynamic Behavior ◽  
Solid Particles ◽  
Turbine Stage

Experimental Investigation on the Forced Response of a Dummy Counter Rotating Turbine Stage With Friction Damping

2012 ◽  
Author(s):  
Teresa Berruti ◽  
Vanni Maschio ◽  
Paolo Calza
Keyword(s):  
Experimental Investigation ◽  
Dynamic Behavior ◽  
Dry Friction ◽  
Vibration Damping ◽  
Forced Response ◽  
Test Results ◽  
Turbine Stage ◽  
Friction Damping ◽  
Experimental Activity ◽  
Open Rotor

The paper shows the results of the experimental activity about the dynamics of a stage of a counter rotating turbine of an open rotor architecture engine. The tests here presented explore the dynamic behavior of a simplified counter-rotating turbine stage. The test results show the dynamic behavior of a counter rotating turbine stage and highlight the importance of the presence of dry friction for vibration damping.

Experimental Investigation on the Forced Response of a Dummy Counter-Rotating Turbine Stage With Friction Damping

2012 ◽  
Vol 134 (12) ◽  
Author(s):  
Teresa Berruti ◽  
Vanni Maschio
Keyword(s):  
Experimental Investigation ◽  
Dynamic Behavior ◽  
Dry Friction ◽  
Vibration Damping ◽  
Forced Response ◽  
Test Results ◽  
Turbine Stage ◽  
Friction Damping ◽  
Experimental Activity ◽  
Open Rotor

The paper shows the results of the experimental activity about the dynamics of a stage of a counter-rotating turbine of an open rotor architecture engine. The tests presented here explore the dynamic behavior of a simplified counter-rotating turbine stage. The test results show the dynamic behavior of a counter-rotating turbine stage and highlight the importance of the presence of dry friction for vibration damping.

Hydrodynamic Characteristics of Free Rise of Light Spheres and Bubbles in Newtonian and Non-Newtonian Liquids

2008 ◽  
Vol 591-593 ◽  
pp. 785-790 ◽  
Author(s):  
F.R.G. Melo ◽  
Marcos A.S. Barrozo ◽  
Carlos Henrique Ataíde
Keyword(s):  
Experimental Data ◽  
Reynolds Number ◽  
Dynamic Behavior ◽  
Gas Bubbles ◽  
Free Fall ◽  
Solid Particles ◽  
Hydrodynamic Characteristics ◽  
Light Particles ◽  
Newtonian Liquids

Some authors showed that the results obtained for the movement of particle fall in liquids could not be extended to describe the rising of light particles with the same diameter in the same difference of density conditions, especially in the region of higher Reynolds number. The main objective of this study was the investigation of the dynamic behavior of light spheres and of gas bubbles isolated in stagnant liquids. The experimental data of the rising of light spheres and bubbles were obtained with photographic techniques and a stroboscope. The obtained results showed that there were significant differences between the behavior of the ascending gas bubbles and the solid particles in free fall.

Ball bearing turbocharger vibration management: application on high speed balancer

2020 ◽  
Vol 21 (6) ◽  
pp. 619
Author(s):  
Kostandin Gjika ◽  
Antoine Costeux ◽  
Gerry LaRue ◽  
John Wilson
Keyword(s):  
Dynamic Behavior ◽  
High Speed ◽  
Internal Combustion Engines ◽  
Ball Bearing ◽  
Squeeze Film ◽  
Design And Technology ◽  
Squeeze Film Damper ◽  
Damping Coefficients ◽  
Bearing Loads ◽  
Stiffness And Damping

Today's modern internal combustion engines are increasingly focused on downsizing, high fuel efficiency and low emissions, which requires appropriate design and technology of turbocharger bearing systems. Automotive turbochargers operate faster and with strong engine excitation; vibration management is becoming a challenge and manufacturers are increasingly focusing on the design of low vibration and high-performance balancing technology. This paper discusses the synchronous vibration management of the ball bearing cartridge turbocharger on high-speed balancer and it is a continuation of papers [1–3]. In a first step, the synchronous rotordynamics behavior is identified. A prediction code is developed to calculate the static and dynamic performance of “ball bearing cartridge-squeeze film damper”. The dynamic behavior of balls is modeled by a spring with stiffness calculated from Tedric Harris formulas and the damping is considered null. The squeeze film damper model is derived from the Osborne Reynolds equation for incompressible and synchronous fluid loading; the stiffness and damping coefficients are calculated assuming that the bearing is infinitely short, and the oil film pressure is modeled as a cavitated π film model. The stiffness and damping coefficients are integrated on a rotordynamics code and the bearing loads are calculated by converging with the bearing eccentricity ratio. In a second step, a finite element structural dynamics model is built for the system “turbocharger housing-high speed balancer fixture” and validated by experimental frequency response functions. In the last step, the rotating dynamic bearing loads on the squeeze film damper are coupled with transfer functions and the vibration on the housings is predicted. The vibration response under single and multi-plane unbalances correlates very well with test data from turbocharger unbalance masters. The prediction model allows a thorough understanding of ball bearing turbocharger vibration on a high speed balancer, thus optimizing the dynamic behavior of the “turbocharger-high speed balancer” structural system for better rotordynamics performance identification and selection of the appropriate balancing process at the development stage of the turbocharger.

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