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The effect of fuel injection advance angle on temperature state of diesel engine piston

Aryan R., Pylyov V.

Zeszyty Naukowe Instytutu Pojazdów / Politechnika Warszawska

2016

z. 4/108

77--86

It was proven that fuel injection advance angle has an effect on temperature state of diesel engine piston. This effect is significant and commensurable with the piston oil cooling effect. The methodology for determining boundary conditions of piston heat exchange that considers fuel injection advance angle was developed. Empiric dependency of heat transfer in piston CC from diesel power and fuel injection advance angle is offered. The results of temperature state of diesel piston 4ЧН12/14 are represented at different engine boost levels, fuel injection advance angle and structure oil-cooling methods.

Wykazano, że stan cieplny tłoka zależy od kąta wyprzedzenia wtrysku oleju napędowego. Efekt ten jest istotny i współmierny z efektem chłodzenia tłoków olejem smarującym. W pracy przedstawiono empiryczną zależność przewodzenia ciepła w komorze spalania tłoka silnika o zapłonie samoczynnym od kąta wyprzedzenia wtrysku paliwa. Artykuł zawiera również wyniki badań stanu cieplnego tłoka silnika o zapłonie samoczynnym 4ChN12/14 dla różnych wartości obciążenia, kąta wyprzedzenia wtrysku paliwa i konstrukcji systemu chłodzenia olejem.

On an application of an interval backward ﬁnite diﬀerence method for solving the one-dimensional heat conduction problem

Jankowska M., Marciniak A., Hoﬀmann T.

Control and Cybernetics

2015

Vol. 44, no. 4

463--480

The paper concerns the interval method for solving the one-dimensional heat conduction problem. It is based on the conventional backward ﬁnite diﬀerence scheme with the appropriate local truncation error terms that are also taken into account. For the theoretical formulation of the interval approach we can show that the exact solution is included in the interval one. In practice, there are problems, for which we cannot determine the endpoints of the error term intervals exactly. Nevertheless, if we use the appropriate approximation, related to the endpoints considered, then the numerical experiments conﬁrm that the interval solution includes the exact one.

Heat conduction problem in a two-layered hollow cylinder by using the Green's function method

Kukla S., Siedlecka U.

Journal of Applied Mathematics and Computational Mechanics

2013

Vol. 12, nr 2

45--50

In this paper, a solution of the heat conduction problem in a two-layered hollow cylinder by using the Green’s function method is presented. The considerations concern the heat conduction in the radial direction while taking into account time-dependent boundary conditions. The continuity condition of the temperature at the dividing surface of the layers is written in the form of a Volterra integral equation.