Steady and Cyclic Thermal Stresses of Diesel Engine Pistons - A Photothermoelastic Study and Calculation

1972 ◽  
Author(s):  
M. Mihara ◽  
T. Kokubu ◽  
K. Hirata
Keyword(s):  
Diesel Engine ◽  
Thermal Stresses

The analyses of frictional losses and thermal stresses in a diesel engine piston coated with different thicknesses of thermal barrier films using co-simulation method

2021 ◽  
pp. 146808742110656
Author(s):  
Fatma Bayata ◽  
Cengiz Yildiz
Keyword(s):  
Diesel Engine ◽  
Coating Thickness ◽  
Thermal Stresses ◽  
Equivalent Stress ◽  
Simulation Method ◽  
Thermal Barrier ◽  
Barrier Films ◽  
Engine Piston ◽  
Frictional Performance ◽  
Artificial Neural Network Ann

This study comparatively presents the thermal and mechanical effects of different Thermal Barrier Coatings (TBCs) and their thicknesses on the performance of aluminum diesel engine piston by combining Finite Element Analyses (FEA) and Artificial Neural Network (ANN) methods. The piston structure of MWM TbRHS 518S indirect injection six-cylinder diesel engine was modeled. The clustered TBCs (NiCrAlY–Gd2Zr2O7, NiCrAlY–MgO-ZrO2, NiCrAl–Yttria Partially Stabilized Zirconia (YPSZ), and NiCrAlY–La2Zr2O7) were implemented to the related surface of aluminum alloy piston and then static, thermal, and transient structural FEA were conducted for each model. Based on both of the temperature and equivalent stress distributions, NiCrAlY–Gd2Zr2O7 coated model displayed the best performance. Additionally, the effects of top coating thicknesses of TBCs were investigated in the range of 0.1–1.0 mm with 0.1 mm increments in FEAs. The thermally effective top coating thickness was predicted as 0.95 mm for the selected TBC using ANN method. Then the effects of coating thickness on frictional performance were revealed by generating transient structural FE models and utilizing stribeck diagram. The uncoated and 0.95 mm NiCrAlY–Gd2Zr2O7 coated models were adjusted as transient and the related crank angle – dependent in-cylinder combustion pressure data was implemented. The friction force was reduced by at least 15% in NiCrAlY–Gd2Zr2O7 coated model.

Weldment Analysis of a Diesel Engine Exhaust Manifold

2016 ◽  
Author(s):  
Masoud Mojtahed ◽  
Nganh Le ◽  
Jerry Wayne DeSoto
Keyword(s):  
Diesel Engine ◽  
Thermal Loading ◽  
Thermal Stresses ◽  
Engine Performance ◽  
Exhaust Manifold ◽  
Element Analysis ◽  
Performance Requirements ◽  
Pipe Model ◽  
Key Factor ◽  
Double Pipe

The Exhaust Manifold is an increasingly important component of industrial turbocharged diesel engines. It can be a key factor to increase the efficiency of any engine, in this case a power plant diesel engine. Analysis of the various structural and thermal loading of the liquid-cooled manifolds is of vital importance to increase the components efficiency and overall engine performance. In this analysis, problems such as thermal stress issues causing manifold failure are identified and redesigned to meet performance requirements and environmental regulations. These manifolds are of complicated shapes and contain many weld joints to attach several integral parts. The weld regions are identified to be sensitive to thermal stresses and most likely prone to failure. The welds were added to the model in ANSYS® Workbench. Computational Fluid Dynamics (Fluent) and Finite Element Analysis (FEA) were used to analyze the welded model. The main outcome was to understand the welds behavior using the ANSYS software and its powerful tools and to determine whether the areas containing welds are likely to fail under the given conditions. A simple double pipe model was also created and congruently analyzed to validate the results and the techniques used in analyzing the manifold model.

scholarly journals Design, Optimization and Analysis of a 4-stroke Diesel Engine Piston and Piston rings using Different Materials

2018 ◽  
Vol 10 (01) ◽  
pp. 71-80
Author(s):  
Adhir Tandon
Keyword(s):  
Diesel Engine ◽  
High Performance ◽  
Thermal Stresses ◽  
Structural Deformation ◽  
Piston Rings ◽  
Static Structure ◽  
Element Analysis ◽  
Engine Efficiency ◽  
Steel Piston ◽  
Grey Cast

Modern Automobiles expect a high performance from its engines, which in turn places its requirements on the piston and cylinder components. Hence the piston has to deal with harsher, and tougher thermal and mechanical conditions. It has to undergo higher operating temperatures and pressures as well as higher speeds and at the same time keeping a check on the emissions. Pistons play a key role in increasing engine efficiency by reducing weight and frictional losses. This has made it essential to devise and search unique and creative concepts and materials for Pistons repeatedly, which offers what the engine demands. In this work Aluminium Alloy-4032 has been selected as the piston material of a 4-Stroke Diesel Engine and the piston rings are made of grey cast iron and alloy steel. Piston is designed by analytical methods taking both thermal and structural effects into consideration, then modelled on CATIA V5 and the analysis of structural deformation due to thermal stresses has been done using Finite Element Analysis of Steady State Thermal and its effect on static structure using Analysis software ANSYS

Analyses of Temperature and Thermal Stresses of a Ceramic-Coated Diesel Engine Valve

2020 ◽  
pp. 127-134
Author(s):  
Subodh Kumar Sharma ◽  
Krishna V. Ojha ◽  
D. Pradhan ◽  
Pratibha Kumari ◽  
Ajay kumar
Keyword(s):  
Diesel Engine ◽  
Thermal Stresses ◽  
Engine Valve

Design, Optimization and Analysis of a 4-stroke Diesel Engine Piston and Piston rings using Different Materials

2018 ◽  
Vol 10 (1) ◽  
Author(s):  
Adhir Tandon
Keyword(s):  
Diesel Engine ◽  
High Performance ◽  
Thermal Stresses ◽  
Structural Deformation ◽  
Piston Rings ◽  
Static Structure ◽  
Element Analysis ◽  
Engine Efficiency ◽  
Steel Piston ◽  
Grey Cast

Modern Automobiles expect a high performance from its engines, which in turn places its requirements on the piston and cylinder components. Hence the piston has to deal with harsher, and tougher thermal and mechanical conditions. It has to undergo higher operating temperatures and pressures as well as higher speeds and at the same time keeping a check on the emissions. Pistons play a key role in increasing engine efficiency by reducing weight and frictional losses. This has made it essential to devise and search unique and creative concepts and materials for Pistons repeatedly, which offers what the engine demands.In this work Aluminium Alloy-4032 has been selected as the piston material of a 4-Stroke Diesel Engine and the piston rings are made of grey cast iron and alloy steel. Piston is designed by analytical methods taking both thermal and structural effects into consideration, then modelled on CATIA V5 and the analysis of structural deformation due to thermal stresses has been done using Finite Element Analysis of Steady State Thermal and its effect on static structure using Analysis software ANSYS.

Knock criteria for aviation diesel engines

2016 ◽  
Vol 18 (7) ◽  
pp. 752-762 ◽  
Author(s):  
Rik D Meininger ◽  
Chol-Bum M Kweon ◽  
Michael T Szedlmayer ◽  
Khanh Q Dang ◽  
Newman B Jackson ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Diesel Engines ◽  
High Speed ◽  
Thermal Stresses ◽  
Cetane Number ◽  
Pressure Rise ◽  
Maximum Pressure ◽  
Cylinder Wall ◽  
Analysis Model ◽  
Element Analysis

The objective of this study was to develop knock criteria for aviation diesel engines that have experienced a number of malfunctions during flight and ground operation. Aviation diesel engines have been vulnerable to knock because they use cylinder wall coating on the aluminum engine block, instead of using steel liners. This has been a trade-off between reliability and lightweighting. An in-line four-cylinder four-stroke direct-injection high-speed turbocharged aviation diesel engine was tested to characterize its combustion at various ground and flight conditions for several specially formulated Jet A fuels. The main fuel property chosen for this study was cetane number, as it significantly impacts the combustion of the aviation diesel engines. The other fuel properties were maintained within the MIL-DTL-83133 specification. The results showed that lower cetane number fuels showed more knock tendency than higher cetane number fuels for the tested aviation diesel engine. In this study, maximum pressure rise rate, or Rmax, was used as a parameter to define knock criteria for aviation diesel engines. Rmax values larger than 1500 kPa/cad require correction to avoid potential mechanical and thermal stresses on the cylinder wall coating. The finite element analysis model using the experimental data showed similarly high mechanical and thermal stresses on the cylinder wall coating. The developed diesel knock criteria are recommended as one of the ways to prevent hard knock for engine developers to consider when they design or calibrate aviation diesel engines.

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