PREDICTION OF THERMAL LOADING OF SUPERCHARGED DIESEL ENGINES

1979 ◽  
Author(s):  
Gerhard Woschni
Keyword(s):  
Diesel Engines ◽  
Thermal Loading

INCREASING THE RESOURCE OF DIESEL CYLINDER HEADS BY IMPROVING THE TECHNOLOGY OF THEIR RESTORATION

2020 ◽  
Vol 15 (7) ◽  
pp. 950-957
Author(s):  
G.D. Mezhetskiy ◽  
◽  
V.A. Strelnikov ◽  
Keyword(s):  
Diesel Engines ◽  
Thermal Loading ◽  
Theoretical Calculations ◽  
Operating Conditions ◽  
Advanced Technology ◽  
Temperature Fields ◽  
Cylinder Block ◽  
Diesel Cylinder ◽  
Thermal Intensity

The article presents the results of studies of the thermal fatigue strength of diesel cylinder heads and their resource under operating conditions, by using the most advanced technology for their restoration. Based on the results of theoretical calculations of durability and operational studies, a restoration technology has been proposed, which makes it possible to increase the resource of cylinder heads by 2 ÷ 2.5 times. For this purpose, the non-uniformity of the temperature field on the firing bottom of the cylinder heads of YaMZ-238NB diesel engines was theoretically determined and experimentally confirmed. On the basis of theoretical calculations, the most heatstressed sections of the plane of the cylinder heads of diesel engines bonded to the cylinder block were determined, and the appearance of cracks in them. When developing a method for calculating the temperature fields of the fire bottom, the universal finite element method (FEM) was used. This method makes it possible to take into account the geometry and conditions of thermal loading of the cylinder heads quite accurately. For the determination of temperature fields, a well-founded assignment of the boundary conditions is crucial. With this in mind, a number of surfaces were determined that characterize the durability of the entire part during operation. As a result of calculations carried out on a computer, temperature fields have been obtained that make it possible to analyze the distribution of temperatures and temperature gradients at any point of the fire bottom. The highest temperatures (620...635K) are localized in the central part of the fire bottom, which is two times higher in thermal intensity than the peripheral one and confirms the appearance of cracks in these places during the operation of diesel cylinder heads.

Paper 2: Some Aspects of the Development of the LVA24 Traction Engine

1968 ◽  
Vol 183 (2) ◽  
pp. 24-34
Author(s):  
A. Dolenc ◽  
R. Lees
Keyword(s):  
Diesel Engines ◽  
High Speed ◽  
Thermal Loading ◽  
Lightweight Design ◽  
Practical Experience ◽  
Specific Output

Lightweight design, high speed and high mean pressures permit high specific output of diesel engines but these are normally associated with high mechanical and thermal loading of critical parts. The paper outlines the approach to the development of the Sulzer LVA24 traction engine and explains the practical experience gained with the components.

Piston Motion and Thermal Loading Analyses of Two-Stroke and Four-Stroke Cycle Engines for Locomotives

1989 ◽  
Vol 111 (3) ◽  
pp. 536-542 ◽  
Author(s):  
S. D. Haddad
Keyword(s):  
Diesel Engines ◽  
Thermal Loading ◽  
Correct Choice ◽  
Combustion Efficiency ◽  
Cycle Performance ◽  
Piston Motion ◽  
The Status ◽  
Current Production ◽  
Stroke Cycle ◽  
Locomotive Diesel

Two-stroke cycle and four-stroke cycle diesel engines are in use in rail traction, with the four-stroke cycle design dominating the field. Cycle simulations using computer programs have shown that the conventional two-stroke cycle is somewhat inferior to its four-stroke cycle counterpart in combustion efficiency and thermal loading. Research at Sulzer concluded that the conventional two-stroke cycle engine is not very suitable for locomotive application. A survey by Ricardos, based on an investigation of engines in current production for traction application, suggested that there are potentials in two-stroke cycle design. This paper presents a summary of the results of a research project concerned with comparison of two well-proven typical locomotive diesel engines, one with a two-stroke cycle and the other with a four-stroke cycle. Performance, mechanical loading, thermal loading, and vibration were chosen as parameters to be investigated to provide information on the status of the two cycles in relation to power range, fuel consumption, reliability, and durability, with a view to assisting the users of locomotive engines to make the correct choice.

scholarly journals Computational and Experimental Method for Assessing the Thermal Strength of High-Loaded Diesel Engines

2021 ◽  
Vol 2096 (1) ◽  
pp. 012204
Author(s):  
V P Belov ◽  
D V Apelinskiy
Keyword(s):  
Diesel Engines ◽  
Thermal Loading ◽  
Thermal Strength ◽  
Piston Head ◽  
Correct Calculation ◽  
Deformation Kinetic ◽  
Kinetic Criterion ◽  
Experimental Values ◽  
Specific Implementation ◽  
Isothermal Stamping

Abstract The article discusses the reasons of fatigue failure of pistons of high-loaded diesel engines. A deformation-kinetic criterion is proposed, generalized to non-isothermal loading, which allows more correct calculation of the number of thermal loading cycles before the appearance of fatigue damage. For a specific implementation of the proposed criterion, a calculated assessment of the piston stress-strain rate was carried out using the FEM. The boundary conditions for the calculation were obtained by thermometry of the piston head on a non-motorized thermal stand (TS). Comparison of the calculated and experimental values of the number of thermal cycles before the appearance of cracks on the edge of the combustion chamber (CC) of pistons made by casting and isothermal stamping is given.

scholarly journals MATHEMATICAL MODEL OF COMBINED PARAMETRICAL ANALYSIS OF IN INDICATOR PROCESS AND THERMAL LOADING ON THE DIESEL ENGINE PISTON

Transport ◽  
2004 ◽  
Vol 19 (3) ◽  
pp. 108-118 ◽  
Author(s):  
Sergejus Lebedevas ◽  
Galina Lebedeva
Keyword(s):  
Mathematical Model ◽  
Diesel Engine ◽  
Diesel Engines ◽  
Thermodynamic Model ◽  
Thermal Loading ◽  
Design Work ◽  
Engine Piston ◽  
Engine Cycle

In the publication the methodical aspects of a mathematical model of the combined parametrical analysis of an indicator process and thermal loading on the diesel engine piston have been considered. A thermodynamic model of a diesel engine cycle is developed. The executed development is intended for use during researches and on the initial stages of design work. Its realization for high revolution diesel engines of perspective type CHN15/15 allowed to choose rational variants for the organization of an indicator process and to prove power ranges of application for not cooled and created cooled oil welded pistons.

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