Combined Air-Oil Cooling on a Supercharged TC & IC TAM Diesel Engine

1993 ◽  
Vol 115 (4) ◽  
pp. 742-746 ◽  
Author(s):  
F. Trenc ◽  
R. Pavleticˇ
Keyword(s):  
Heat Transfer ◽  
Diesel Engine ◽  
Experimental Work ◽  
Temperature Gradients ◽  
Numerical Analyses ◽  
Cylinder Wall ◽  
Cross Sectional ◽  
Lubrication Oil ◽  
Oil Flow ◽  
Combined Cooling

In order to reduce the maximum cylinder wall temperatures of an air-cooled TC&IC diesel engine with large longitudinal and circumferential temperature gradients, a curved, squared cross-sectional channel supplied with engine lubrication oil was introduced into the upper part of the cylinder wall. Numerical analyses of the heat transfer within the baseline air-cooled cylinder and intensive experimental work helped to understand the temperature situation in the cylinder at diverse engine running conditions. The results of the combined cooling were greatly affected by the design, dimensions, position of the channel, and the distribution of the cooling oil flow, and are presented in the paper.

scholarly journals The Heat Transfer Study in the Diesel Engine Combustion Chamber Using a Two-Zone Combustion Model

2020 ◽  
Vol 7 (4) ◽  
pp. 614-620
Author(s):  
Brahim Menacer ◽  
Naima Khatir ◽  
Mostefa Bouchetara ◽  
Ahmed Amine Larbi ◽  
Cherif Belhout
Keyword(s):  
Heat Transfer ◽  
Diesel Engine ◽  
Combustion Chamber ◽  
Fuel Consumption ◽  
Combustion Engine ◽  
Simulation Software ◽  
Combustion Model ◽  
Zone Model ◽  
Cylinder Wall ◽  
Simulation Results

The study of heat transfer phenomena in diesel engines is a very complex task considering the number of engine components such as intake and exhaust manifolds, lubricant oil and coolant subsystems, the different heat transfer mechanisms (conduction, convection, and radiation). This paper presents simulation results using a dual-zone model associated to GT-Suite simulation software for the calculation of convective heat transfer from gas to the cylinder wall, radiation heat transfer, gas pressure and temperature for low, partial and full load engine as a function of crank angle for a single-cylinder diesel engine. In this present article, a numerical simulation model was created to foresee the main combustion characteristics, and the simulated results were approved through the reference experiment data. Simulation results showed that any increase in the mass of fuel injected into the combustion chamber would generate a significant increase in the level of pressure and temperature of the combustion gases in the cylinder. This means that despite the improved power performance, excessive fuel consumption would have a negative effect on the thermal behavior and consequently on the life of the engine. The essential objective of any combustion engine development is to reduce fuel consumption while maintaining or improving the engine's power output.

scholarly journals Two-Phase Air/Oil Flow in Aero-Engine Bearing Chambers – Assessment of an Analytical Prediction Method for the Internal Wall Heat Transfer

1999 ◽  
Vol 5 (3) ◽  
pp. 155-165 ◽  
Author(s):  
A. Glahn ◽  
S. Wittig
Keyword(s):  
Heat Transfer ◽  
Prediction Method ◽  
Analytical Prediction ◽  
Two Phase ◽  
Gravity Forces ◽  
Lubrication Oil ◽  
Oil Flow ◽  
Aero Engines ◽  
Film Flows ◽  
Engine Bearing

The present paper gives a theoretical outline on liquid film flows driven by superimposed effects of interfacial shear and gravity forces and discusses related heat transfer processes which are relevant for lubrication oil systems of aero engines. It is shown that a simple analytical approach is able to predict measured heat transfer data fairly well. Therefore, it offers scope for improvements within the analysis of bearing chamber heat transfer characteristics as well as for appropriate studies with respect to other components of the lubrication oil system such as vent pipeline elements.

Experimental Study of Heat Transfer in a Direct Injection Diesel Engine

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
P. Raghu ◽  
R. Sundarrajan ◽  
R. Rajaraman ◽  
M. Ramaswamy ◽  
B. Sathyanaryanan
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Diesel Engine ◽  
Heat Transfer Rate ◽  
Transfer Rate ◽  
Engine Speed ◽  
Direct Injection ◽  
Cylinder Wall ◽  
Direct Injection Diesel Engine ◽  
Wide Range

An experimental study has been established to understand the effective cylinder wall heat transfer rate and temperature of a direct injection diesel engine. Temperatures were calculated under a wide range of load at different locations in the cylinder block and cylinder head of the engine using pre-arranged thermocouples to acquire the temperature gradient and consequently realize the equivalent heat transfer rate, cylinder wall temperatures, heat transfer co-efficient and engine speed. Diesel and biodiesel blends (B20 and B100) are used as fuels and the temperature readings are found using a ‘k-type’ thermocouple and temperature readings are noted. Raise in the cylinder temperature is observed as the engine torque increases for the diesel and biodiesel. As the engine speed increases, the exhaust gas velocity involved in and out of the engine will increases and this lead to an increase in the heat transfer co-efficient for diesel and biodiesel.

scholarly journals Local and Mean Heat Transfer Coefficients Along the Internal Housing Walls of Aero Engine Bearing Chambers

1997 ◽  
Author(s):  
A. Glahn ◽  
S. Busam ◽  
S. Wittig
Keyword(s):  
Heat Transfer ◽  
Flow Rate ◽  
Air Flow ◽  
Operating Conditions ◽  
Operational Parameters ◽  
Transfer Coefficients ◽  
Local Data ◽  
Heat Transfer Coefficients ◽  
Lubrication Oil ◽  
Oil Flow

A proper matching of the heat transfer to the lubrication oil in bearing chambers and subsequent vent and scavenge pipes is one of the major tasks in the design process of secondary air/lubrication oil systems of modern jet engines. For a calculation of lubrication oil flow rates, which should be kept as small as possible in order to reduce parasitic losses due to larger pumps, filters and coolers, a sufficient knowledge of all heat transfer phenomena involved in bearing chamber flows is required. Beside heat sources such as the bearing friction, the heated sealing air flow and the churning and ventilation of two-phase mixtures, the heat transfer at the housing walls has to be considered. The present paper deals with an experimental investigation of the latter effect based on engine relevant pressure and temperature levels bearing chamber operating conditions. Air/oil flow heat transfer measurements at the internal bearing chamber walls are described utilizing the temperature gradient method. It is a stationary technique based on a two-dimensional finite element calculation procedure. Influences of sealing air flow rate, lubrication oil flow rate and rotational speed on local heat transfer coefficients are discussed. Mean heat transfer coefficients that have been calculated from local data are presented in terms of operational parameters.

scholarly journals Experimental Thermal Analysis of Diesel Engine Piston and Cylinder Wall

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Subodh Kumar Sharma ◽  
P. K. Saini ◽  
N. K. Samria
Keyword(s):  
Heat Transfer ◽  
Diesel Engine ◽  
Wall Temperature ◽  
Thermal Loading ◽  
Thermal Stresses ◽  
Transfer Model ◽  
Cylinder Wall ◽  
Fe Model ◽  
Transfer Coefficients ◽  
Thermocouple Wire

Knowledge of piston and cylinder wall temperature is necessary to estimate the thermal stresses at different points; this gives an idea to the designer to take care of weaker cross section area. Along with that, this temperature also allows the calculation of heat losses through piston and cylinder wall. The proposed methodology has been successfully applied to a water-cooled four-stroke direct-injection diesel engine and it allows the estimation of the piston and cylinder wall temperature. The methodology described here combines numerical simulations based on FEM models and experimental procedures based on the use of thermocouples. Purposes of this investigation are to measure the distortion in the piston, temperature, and radial thermal stresses after thermal loading. To check the validity of the heat transfer model, measure the temperature through direct measurement using thermocouple wire at several points on the piston and cylinder wall. In order to prevent thermocouple wire entanglement, a suitable pathway was designed. Appropriate averaged thermal boundary conditions such as heat transfer coefficients were set on different surfaces for FE model. The study includes the effects of the thermal conductivity of the material of piston, piston rings, and combustion chamber wall. Results show variation of temperature, stresses, and deformation at various points on the piston.

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