It is known that vortex rings formed by large stroke ratios ~in a piston/cylinder arrangement! pinch off from their generating jets at a fairly constant universal time scale. In this paper we show that the hypothesis that at the pinch off the translational velocity of the ring equals the jet flow velocity near the ring is equivalent to the recently proposed idea based on a variational principle...

In the present paper the elastodynamic finite integration technique (EFIT) is combined with pointsource-synthesis (PSS) in order to efficiently calculate 3-D ultrasonic wave fields in the time-domain. The technique can be applied to arbitrarily layered locally isotropic media and includes the complete spectrum of linear elastic wave phenomena like surface and interface waves, head waves, mode c...

A novel integrated multi-physics assessment of the piston top compression ring an internal combustion engine under normal operation mode, as well subjected to cylinder deactivation is carried out. The methodology comprises ring-liner thermo-mixed hydrodynamics, elastodynamics ring, gas blow-by and emissions. Therefore, analysis provides prediction contact’s energy losses power leakage across cr...

This article concerns the method of material consumption assessment cylinder-piston group diesel engines in biodiesel environment. The obtained experimental dependences wear coefficients on example tribounit cylinder liner and piston ring can be used to forecast resource use during operation under specific conditions engine environment as a whole. systematizes types biofuels, depending type raw...