Micro-cogeneration with locally produced biogas from waste is a proven technique for supporting the decarbonization process. However, strongly variable composition of can make its use in internal combustion engines quite challenging. Dual-fuel offer advantages over conventional SI and diesel engines, but there are still issues to be addressed, such as low-load thermodynamic efficiency nitrogen ...

A newly developed heavy duty diesel engine in dual fuel mode of operation has been studied in detail. The main fuel would be natural gas and diesel oil as pilot injection. The importance and effects of mixture preparation and formation through ports, valves and in cylinder flow field with different swirl ratio and tumble on diesel combustion phenomena is an accepted feature which has been studi...

In three-dimensional (3D) computational fluid dynamics (CFD) simulations, the effects of injection timing and spray inclusion angle (SIA) on performance emissions diffusion-controlled Premixed Charge Compression Ignition (PCCI) combustion in part load for a heavy-duty direct (HDDI) diesel engine are studied. The start (SOI) 146° SIA injector is varied between ?70 ?10 °crank (°CA) after top dead...

Two stages gas guns are used for various purposes, particularly for mechanical characterization of materials at high rate of deformations. The performance of a two stages gas gun is studied in this work using the theory of the two-stage gas gun proposed by Rajesh, numerical simulation using combined Eulerian/ Lagrangian elements in Autodyna commercial code and experiment using a two stage gas g...

The friction in the swash plate type axial piston pumps is mainly influenced by fluid film interface. piston–cylinder interface one of key interfaces pumps. geometry determined gap between and cylinder. dimensions parts determine geometry, deformation structure also influences geometry. viscosity strongly temperature. Thus, a novel approach studying film, structure, temperature interaction prov...

We calculate the scalar Casimir energy and Casimir force for a R×N Kaluza-Klein piston setup in which the extra dimensional space N contains a non-commutative 2sphere, SFZ . The cases to be studied are T d × SFZ and SFZ respectively as extra dimensional spaces, with T d the d dimensional commutative torus. The validity of the results and the regularization that the piston setup offers are exami...

Our goal is to model and analyze a stationary fluid flow through the junction of two pipes in the gravity field. Inside ’vertical’ pipe there is a heavy piston which can freely move along the pipe. We are interested in the equilibrium position of the piston in dependence on geometry of junction. Fluid is modeled with the Navier-Stokes equations and the piston is modeled as a rigid body. We form...