Development of Techniques for Improving Piston Cooling Performance (First Report)~Measurement of Heat Absorption Characteristics by Engine Oil in Cooling Channel

2005 ◽  
Author(s):  
Yu Nozawa ◽  
Takashi Noda ◽  
Tomohisa Yamada ◽  
Yoshitaka Takeuchi ◽  
Kenta Akimoto
Keyword(s):  
Engine Oil ◽  
Heat Absorption ◽  
Cooling Channel ◽  
Cooling Performance ◽  
First Report ◽  
Piston Cooling ◽  
Absorption Characteristics

An Experimental and Numerical Investigation of the Effect of Cooling Channel Crossflow on Film Cooling Performance

2007 ◽  
Author(s):  
Harald Peter Kissel ◽  
Bernhard Weigand ◽  
Jens von Wolfersdorf ◽  
Sven Olaf Neumann ◽  
Antje Ungewickell
Keyword(s):  
Numerical Investigation ◽  
Film Cooling ◽  
Internal Cooling ◽  
Cooling Channel ◽  
Cooling Effectiveness ◽  
Cooling Performance ◽  
Film Cooling Effectiveness ◽  
Gas Channel ◽  
Cooling Hole ◽  
Flow Situation

This paper presents an experimental and numerical investigation into film cooling performance over a flat plate. As previous studies have shown, the flow situation at the entry-side of the cooling hole shows a notable effect on film cooling performance. The present investigation takes this into account feeding the cooling holes from an internal cooling channel and not from a stagnant plenum. High resolution heat transfer coefficient and adiabatic film cooling effectiveness distributions received from transient liquid crystal experiments are presented. The Reynolds numbers of the hot gas channel and the coolant crossflow feeding the holes are varied. Furthermore, the effects of 45° angled ribs, introduced into the cooling channel, are investigated. The experiments are performed at constant blowing, momentum and pressure ratios. Numerical calculations of the adiabatic film cooling effectiveness for selected configurations using FLUENT are presented. Comparison reveals the influence of coolant channel Reynolds number and the introduced ribs on the cooling hole flow pattern leading to a changed film cooling performance.

The flow and heat transfer characteristics of engine oil inside the piston cooling gallery

2017 ◽  
Vol 115 ◽  
pp. 620-629 ◽  
Author(s):  
Peng Wang ◽  
Ruobing Liang ◽  
Yuebin Yu ◽  
Jili Zhang ◽  
Jizu Lv ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Engine Oil ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Flow And Heat Transfer ◽  
Piston Cooling

Enhanced Heat Transfer of Shaker-Bored Piston Cooling Channel with Twisted Tape Insert

2007 ◽  
Vol 28 (4) ◽  
pp. 321-334 ◽  
Author(s):  
S. W. Chang ◽  
L. M. Su ◽  
T. L. Yang ◽  
S. F. Chiou
Keyword(s):  
Heat Transfer ◽  
Twisted Tape ◽  
Cooling Channel ◽  
Enhanced Heat Transfer ◽  
Piston Cooling

scholarly journals Simulation of the oil supply through the connecting rod to the piston cooling channels in medium speed engines

2020 ◽  
Vol 180 (1) ◽  
pp. 25-30
Author(s):  
Maciej JASKIERNIK ◽  
Konrad BUCZEK ◽  
Jędrzej WALKOWIAK
Keyword(s):  
Compression Ratio ◽  
Flow Simulation ◽  
Engine Oil ◽  
Connecting Rod ◽  
Engine Operation ◽  
Oil Supply ◽  
Cooling Channels ◽  
Medium Speed ◽  
Oil Flow ◽  
Piston Cooling

The importance of the oil flow simulation in connecting rod oil channels during the engine development process is recently increasing. This can be observed either in medium speed engines, where, as one of the traditional solutions, the oil for piston cooling is supplied through the connecting rod, or in automotive engine VCR (variable compression ratio) connecting rods, where engine oil is used to change the compression ratio of the engine. In both cases, precise numerical results are necessary to shorten the prototyping period and to reduce the overall development cost. The multi-physics character of the simulation problem basically consists of the interaction between the dynamics of the crank train components and the oil flow. For the oil supply to the piston cooling channels through the connecting rod in medium speed engines, being the objective of this paper, a major influencing factor is the oil pressure behavior in the piston cooling gallery providing periodical interaction with its supply. At the same time, the connecting rod elastic deformation during engine operation can be regarded as negligible and the planar motion of the connecting rod can be reproduced by combination of translational and rotational acceleration fields in the CFD solver. The paper includes the description of the applied simulation approach, the results and a comparison with the state-of-the art calculation without consideration of the above-mentioned influencing factors.

Comparison of Cooling Performance between High Thermal Conductivity Steel (HTCS 150) and Hot Work Tool Steel (SKD 61) Insert for Experimental Tool Using Finite Element Analysis

2014 ◽  
Vol 903 ◽  
pp. 163-168 ◽  
Author(s):  
Zahari Taha ◽  
Ahmad Razlan Yusoff ◽  
Mohamad Farid Mohamd Sharif ◽  
M. Ali Hanafiah Saharudin ◽  
Mohd Fawzi Zamri
Keyword(s):  
Finite Element ◽  
Cooling System ◽  
Hot Stamping ◽  
Cooling Channel ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Cooling Performance ◽  
Cooling Channels ◽  
Channel Parameters ◽  
Tool Cooling

In hot stamping, the tool cooling system plays an important role in optimizing the process cycle time as well as maintaining the tool temperature distribution. Since the chilled water is forced to circulate through the cooling channels, there is a need to find the optimal parameters of the cooling channels that will cool down the tool efficiently. In this research paper, the cooling channel parameters that significantly influence the tool cooling performance such as size of the cooling holes, distance between the cooling holes and distance between the cooling holes and the tool surface contour are analyzed using the finite element method for both static and thermal analysis. Finally the cooling performance of two types of materials is compared based on the optimized cooling channel parameters.

On-Engine Study of the Thermal and Performance Impacts of a Variable Displacement Oil Pump

2012 ◽  
Author(s):  
Richard Burke ◽  
Chris Brace ◽  
Andy Lewis ◽  
Roland Stark ◽  
Ian Pegg
Keyword(s):  
Fuel Economy ◽  
Thermal State ◽  
Engine Oil ◽  
Variable Flow ◽  
Warm Up ◽  
Oil Pump ◽  
Flow Device ◽  
Oil Flow ◽  
Variable Displacement ◽  
Piston Cooling

Variable displacement lubricant pumps allow oil flow to be matched to engine requirements over the whole operating range, reducing energy losses through excessive pumping work. An experimental investigation has been performed on-engine to understand the effects of such devices. Significant instrumentation was fitted to the production, EURO IV specification, 2.4L Diesel engine to assess the impacts of lubricant flow on thermal state. The reduced oil flow was measured as a reduction in engine oil pressure with the production pump supplying 4–6bar whereas the variable flow device provided pressures as low as 1–2bar. The reduction in oil flow significantly reduced the oil pump energy consumption, measured as a change in indicated work, resulting in a 4% benefit in fuel economy over both hot and cold start NEDC. The reduced oil flow also impacted oil and metal temperatures: during engine warm-up, oil temperatures were approximately 4°C colder with the lower flow as a result of less work input from the oil pump. Conversely, cylinder liner temperatures were 2–6°C hotter both during warm-up and fully warm conditions as a result of reduced piston cooling from piston cooling jets. The changes in thermal state were reflected by changes in emissions with a 3% increase in NOx and a 3–5% reduction in HC and CO. The calibration of the variable flow device follows a fuel consumption/NOx trade-off that is more favourable to fuel economy than conventional control parameters. However, these benefits are strongly linked to engine duty cycle with larger benefits at higher engine speeds.

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