A comprehensive model of the system piston–ring–cylinder (PRC) of a marine two-stroke engine is presented. Among submodels developed by the author concerning gas flow through the labyrinth seal of piston rings, oil flow, ring twist, and axial ring motion in piston grooves, the model includes submodels of mixed lubrication formulated by Patir, Cheng and Greenwood, Tripp. The main parts of the developed model and software have been experimentally verified by the author during a research period at a marine engine design center. A relatively good qualitative and quantitative compatibility between the experimental measurements and calculated results has been achieved.

The effectiveness of railway brakes strongly depends on their thermal condition. A computer simulation and experimental investigations on a full-scale dynamometric stand were chosen as an adequate analysis of the heat transfer process in brakes. The article introduces a two-dimensional, axisymmetric numerical model of the tested disc brake. Boundary conditions related to the heat generated in the friction brake and heat transferred to the environment are also presented. The transient heat transfer problem was solved using the in-house computer program of the finite element method. The article presents simulations and experimental investigations of the intensive braking of a train with an initial high speed. Temperature responses of the disc brake on the friction surface and at other selected points are shown. In addition, a thermal imaging camera was used to assess the temperature distribution on the friction surface of the disc. The results of experimental and simulation tests were preliminarily compared. Similar maximum temperature values were obtained at the end of braking with a particular discrepancy in temperature responses during the analyzed process.

De Gruyter | 270 years of academic publishing

In the paper a model of transient gas flows through the labyrinth seal: piston-rings-cylinder (PRC) has been presented. The results of calculations for a ring pack of three piston rings operating on a cylinder liner of a spark ignition internal combustion engine have been shown. The analysis of the gas dynamics and a parametric study considering this phenomenon has been carried out. It allowed evaluating the influence of the most important parameters of this sealing on the gas pressure acting on the rings and blow-by to the crankcase. The simulation results show the necessity of taking into account the following parameters: uneven wear of cylinder liner and its thermal and mechanical deformation, thermal deformation of piston rings, heat transfer between the flowing gas and the labyrinth walls, dynamics of axial ring displacements in piston grooves.

A multilayer Intermetallic Thermal Barrier Coating has been developed at the University of Windsor using a Cold Spray method. The coating is composed of layers of SHS717 stainless steel (Fe, Cr, Mo, W, C, Mn, Si & B) and layers of aluminum acting as bond coats. The coating properties match...