... received May 10, 2018; final manuscript received May 10, 2018; published online July 9, 2018. Editor: David Wisler. 10 05 2018 10 05 2018 Engines Friction Internal combustion engines Wear Electroplated soft metal overlays were first applied to copper-based engine bearing...

... with particular wall friction laws for the stator and the rotor. Indeed, the presence of a texture on the stator wall modifies the shear stress on the rotor and the stator. The wall friction coefficient was determined by Zerarka [ 12 ] after a large number of three-dimensional CFD parametric studies performed...

... Fouling Friction Multiphase flows Nonintrusive diagnostics Sprays Two-phase Visualization Wear The change in energy production from fossil fuels to renewable sources results in a fluctuation of the produced electric energy. To ensure grid stability, a higher flexibility of conventional...

... to instantaneous lubricant film thickness. Then, the photomultiplier signal is calibrated for lubricant film thickness using a laser textured cylinder bore with known geometries. Additional marks were etched on the liner for calibration. The LIF system is adapted to a piston ring and cylinder bore friction test...

...: David Wisler. 04 10 2017 04 11 2017 Friction Structural dynamics Vibration Wear One of the challenges of turbine designers is to design correctly the interfaces with friction between different turbine parts [ 1 – 7 ]. These interfaces should provide enough damping...

...Giuseppe Battiato; Christian M. Firrone; Teresa M. Berruti; Bogdan I. Epureanu Most aircraft turbojet engines consist of multiple stages coupled by means of bolted flange joints which potentially represent source of nonlinearities due to friction phenomena. Methods aimed at predicting the forced...

... Convective heat transfer Energy conversion Friction Heat transfer Modeling Power systems Structural dynamics Wear Turbocharging is a common method to make an automotive engine of a given size produce more power. Past research mainly focused on turbochargers (TCs) thermal performance...

...Mario Schinnerl; Jan Ehrhard; Mathias Bogner; Joerg Seume The measured performance maps of turbochargers (TCs), which are commonly used for the matching process with a combustion engine, are influenced by heat transfer and friction phenomena. Internal heat transfer from the hot turbine side...

... URBINES AND P OWER . Manuscript received July 5, 2017; final manuscript received July 5, 2017; published online September 19, 2017. Editor: David Wisler. 05 07 2017 05 07 2017 Aerospace applications Friction Gas turbine technology Wear Foil bearings (FB) using air or gas...

... in the literature. Experimental Friction Wear Gas bearings are fluid film bearings that utilize a gas as the working fluid, typically the same gas as the process of a turbomachine (compressor, turboexpander, etc.). Gas bearings for turbomachinery have notable advantages over traditional oil film...

...Donghyun Lee; Daejong Kim 26 01 2017 27 01 2017 Friction Fuel cell applications Gas turbine technology Wear Equation (7) in the paper should have been (7) V θ − D = 1 − D ( Q θ + ∂ M r θ ∂ r ) = ∂ r ∂ θ...

... Wisler. 29 08 2016 02 09 2016 Design optimization Energy Finite element Friction Petroleum engineering Power systems Swirling Vibration Wear In 2014, Childs et al. [ 1 ] presented lateral rotordynamic predictions for a 20 cm impeller diameter electric submersible pump...

... in an internal combustion (IC) engine can be divided into thermal and parasitic as well as due to gas leakage because of untoward compression ring motions. Frictional losses are particularly of concern at low engine speeds, assuming a greater share of the overall losses. Piston–cylinder system accounts...

... October 11, 2016. Editor: David Wisler. 14 07 2016 14 07 2016 Computational mechanics Finite element methods Friction Structural dynamics Vibration Wear Increasingly tight operating clearances between rotating and static components of aircraft engines advantageously...

... to a contact of the bristles and the rotor surface. Besides abrasive wear occurrence, the friction between the bristles and the rotor leads to heat generation which can be detrimental to turbine operation due to thermal effects, leading to rotor bending connected to increasing shaft vibrations. In order...

...E. P. Petrov An efficient method is proposed for the multiharmonic frequency-domain analysis of the stability for nonlinear periodic forced vibrations in gas turbine engine structures and turbomachines with friction, gaps, and other types of nonlinear contact interfaces. The method allows using...

..., the motion at the frictional interfaces can lead to a highly nonlinear dynamic response and cause fretting wear at the contact. The latter will change the contact conditions of the interface and consequently impact the nonlinear dynamic response of the entire assembly. Accurate prediction of the nonlinear...

... and RI mode increases slightly in comparison to that of CC mode, and these three boundary lubrication durations are almost same. However, the thickness of lubricant film between friction pair of three modes is quite different, resulting in their different tribological properties. Among these parameters...

... selected (i.e., pre-optimized) in such a way that those parameter combinations leading to undesirable damper behavior are ruled out a priori: —ensure that damper jamming is avoided by ruling out the undesirable combinations of platform and friction angles; —ensure that damper lift-off is avoided through...

... of bifurcations in realistic gas-turbine structures with friction contacts and with cubic nonlinearity has been shown. Solution of this simple equation allows calculation of the increments for displacements and the null vector using Eqs. (20) and (21) . It should be noted that such solution of the branching...