PE Piston cooling development

This paper describes an experimental study of heat transfer in a reciprocating planar curved tube that simulates a cooling passage in piston. The coupled inertial, centrifugal, and reciprocating forces in the reciprocating curved tube interact with buoyancy to exhibit a synergistic effect on heat transfer. For the present experimental conditions, the local Nusselt numbers in the reciprocating curved tube are in the range of 0.6–1.15 times of static tube levels. Without buoyancy interaction, the coupled reciprocating and centrifugal force effect causes the heat transfer to be initially reduced from the static level but recovered when the reciprocating force is further increased. Heat transfer improvement and impediment could be superimposed by the location-dependent buoyancy effect. The empirical heat transfer correlation has been developed to permit the evaluation of the individual and interactive effects of inertial, centrifugal, and reciprocating forces with and without buoyancy interaction on local heat transfer in a reciprocating planar curved tube.

Download Full-text

Numerical and experimental investigation on the effect of the two-phase flow pattern on heat transfer of piston cooling gallery

Mechanics & Industry ◽

10.1051/meca/2019032 ◽

2019 ◽

Vol 20 (5) ◽

pp. 507 ◽

Cited By ~ 1

Author(s):

Lijun Deng ◽

Jian Zhang ◽

Guannan Hao ◽

Jing Liu

Keyword(s):

Heat Transfer ◽

Flow Pattern ◽

Two Phase Flow ◽

Unstable Wave ◽

Fluid Viscosity ◽

Phase Flow ◽

Two Phase ◽

Flow Process ◽

The Impact ◽

Piston Cooling

To study factors affecting the formation and conversion of two-phase flow pattern as well as the heat transfer of piston cooling gallery, a transient visual target test bench was set up to research the oscillatory flow characteristics in the cooling gallery under idle condition of the engine. The computational fluid dynamics (CFD) was employed while dynamic mesh technology, SST k–ω turbulence model and volume of fluid (VOF) two-phase flow model were applied to simulate the flow process of piston cooling gallery so as to predict the distribution pattern of two-phase flow. Simulation results were in good agreement with that experimentally obtained. It was observed that in the reciprocating movement of the piston, the action of two-phase flow oscillation was severe, forming some unstable wave flows and slug flows. Results show that under the same pipe diameter, the increase of fluid viscosity results in the decrease of amplitude and the increase of the liquid slugs number as well as the enhancement on heat transfer effect. In addition, it was revealed that injection pressure has little effect on the two-phase flow pattern. However, when the pressure is reduced, the change of the liquid phase is weakened and the locations of flow pattern transition move towards to the behind, thus the impact on the heat transfer is also faint.

Download Full-text

Piston Cooling

10.4271/720024 ◽

1972 ◽

Cited By ~ 25

Author(s):

C. C. J. French

Keyword(s):

Piston Cooling

Download Full-text

The reciprocating motion characteristics of nanofluid inside the piston cooling gallery

Powder Technology ◽

10.1016/j.powtec.2015.01.004 ◽

2015 ◽

Vol 274 ◽

pp. 402-417 ◽

Cited By ~ 16

Author(s):

Peng Wang ◽

Jizu Lv ◽

Minli Bai ◽

Gang Li ◽

Ke Zeng

Keyword(s):

Reciprocating Motion ◽

Motion Characteristics ◽

Piston Cooling

Download Full-text

Large Eddy Simulation of Cylindrical Jet Breakup and Correlation of Simulation Results With Experimental Data

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.4036528 ◽

2017 ◽

Vol 139 (10) ◽

Author(s):

Shashank S. Moghe ◽

Scott M. Janowiak

Keyword(s):

Experimental Data ◽

Kinetic Energy ◽

Large Eddy Simulation ◽

Turbulent Kinetic Energy ◽

Experimental Results ◽

Eddy Simulation ◽

Jet Breakup ◽

Large Eddy ◽

Oil Jet ◽

Piston Cooling

Modern engines with increasing power densities have put additional demands on pistons to perform in incrementally challenging thermal environments. Piston cooling is therefore of paramount importance for engine component manufacturers. The objective of this computational fluid dynamics (CFD) study is to identify the effect of a given piston cooling nozzle (PCN) geometry on the cooling oil jet spreading phenomenon. The scope of this study is to develop a numerical setup using the open-source CFD toolkit OpenFoam® for measuring the magnitude of oil jet spreading and comparing it to experimental results. Large eddy simulation (LES) turbulence modeling is used to capture the flow physics that affects the inherently unsteady jet breakup phenomenon. The oil jet spreading width is the primary metric used for comparing the numerical and experimental results. The results of simulation are validated for the correct applicability of LES by evaluating the fraction of resolved turbulent kinetic energy (TKE) at various probe locations and also by performing turbulent kinetic energy spectral analysis. CFD results appear promising since they correspond to the experimental data within a tolerance (of ±10%) deemed satisfactory for the purpose of this study. Further generalization of the setup is underway toward developing a tool that predicts the aforementioned metric—thereby evaluating the effect of PCN geometry on oil jet spreading and hence on the oil catching efficiency (CE) of the piston cooling gallery. This tool would act as an intermediate step in boundary condition formulation for the simulation determining the filling ratio (FR) and subsequently the heat transfer coefficients (HTCs) in the piston cooling gallery.

Download Full-text