Factors Influencing Combustion Chamber Wall Temperatures in a Liquid-Cooled, Automotive, Spark-Ignition Engine

Finlay, I. C.; Harris, Danny; Boam, D J; Parks, B I

doi:10.1243/pime_proc_1985_199_158_01

Cited by 30 publications

(9 citation statements)

References 5 publications

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“…It is well established (Finlay et al 1985;Ajotikar et al 2010) that nucleate boiling occurs in many engines under conditions within the typical operating range of coolant mass flow rate and temperature. It is important to notice, however, that any lack of control on vapor generation could have catastrophic consequences associated with material overheating (Campbell and Hawley 2003).…”

Section: Introductionmentioning

confidence: 99%

A Note on Bubble Sizes in Subcooled Flow Boiling at Low Velocities in Internal Combustion Engine-Like Conditions

Torregrosa

Broatch

Olmeda

et al. 2016

JAFM

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Current trends in engine design indicate the necessity to take advantage of the highest rates of heat transfer associated with nucleate boiling, mostly at high engine loads. When used in conjunction with advanced thermal management strategies, subcooled boiling may take place at very low velocities, for which little information is available, and in ducts with small cross-sectional area, so that undesired effects of the relative sizes of ducts and bubbles may appear. In this paper, experiments on subcooled boiling flow at low velocities and engine-like temperature conditions were conducted with a usual engine coolant. A high-speed photographic camera was used to collect images of the detached vapor bubbles, and the microscopic characteristics of the heating surface were determined. Experimental results for the mean values show acceptable agreement with the results of a mechanistic radius model, when assuming that departure and lift-of radius are related through the flow boiling suppression factor. Additionally, the results obtained are compatible with the sizes of the nucleation sites estimated from the surface characterization. The results obtained for the size distribution are consistent with those found in the literature.

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Section: Introductionmentioning

confidence: 99%

A Note on Bubble Sizes in Subcooled Flow Boiling at Low Velocities in Internal Combustion Engine-Like Conditions

Torregrosa

Broatch

Olmeda

et al. 2016

JAFM

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“…Investigations on engine cooling has been performed since early in the 19th century [24][25][26][27]. In 1958, Kling proposed a method for guiding radiator selection, which adopted a experiential design method to maintain the internal combustion engine body operation within the proper temperature range [28].…”

Section: Basic Engine Coolingmentioning

confidence: 99%

Advances in Integrated Vehicle Thermal Management and Numerical Simulation

et al. 2017

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Abstract:With the increasing demands for vehicle dynamic performance, economy, safety and comfort, and with ever stricter laws concerning energy conservation and emissions, vehicle power systems are becoming much more complex. To pursue high efficiency and light weight in automobile design, the power system and its vehicle integrated thermal management (VITM) system have attracted widespread attention as the major components of modern vehicle technology. Regarding the internal combustion engine vehicle (ICEV), its integrated thermal management (ITM) mainly contains internal combustion engine (ICE) cooling, turbo-charged cooling, exhaust gas recirculation (EGR) cooling, lubrication cooling and air conditioning (AC) or heat pump (HP). As for electric vehicles (EVs), the ITM mainly includes battery cooling/preheating, electric machines (EM) cooling and AC or HP. With the rational effective and comprehensive control over the mentioned dynamic devices and thermal components, the modern VITM can realize collaborative optimization of multiple thermodynamic processes from the aspect of system integration. Furthermore, the computer-aided calculation and numerical simulation have been the significant design methods, especially for complex VITM. The 1D programming can correlate multi-thermal components and the 3D simulating can develop structuralized and modularized design. Additionally, co-simulations can virtualize simulation of various thermo-hydraulic behaviors under the vehicle transient operational conditions. This article reviews relevant researching work and current advances in the ever broadening field of modern vehicle thermal management (VTM). Based on the systematic summaries of the design methods and applications of ITM, future tasks and proposals are presented. This article aims to promote innovation of ITM, strengthen the precise control and the performance predictable ability, furthermore, to enhance the level of research and development (R&D).

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“…(6), respectively. Assuming now that Φ exp is duly represented by Φ as expressed in equations (8) to (12), and that the experimental suppression factor can be written as S exp = ψS , where S is given by Eq. (13) and ψ is an adjustment parameter to be identified, the equation to be fitted to the experimental data is finally…”

Section: Analysis Of the Suppression Factormentioning

confidence: 99%

“…An early contribution was that of Finlay et al [12], who developed equations for forced-convective, nucleate boiling heat transfer that allowed them to predict correctly the relationship between heat flux and surface temperature in the liquid-cooled regions of a cylinder head. More recently, Ajotikar et al [13] considered a simplified geometry, which allowed to establish that nucleate boiling occurs for the typical operating range of coolant mass flow rate and temperature.…”

Section: Introductionmentioning

confidence: 99%

Experiments on subcooled flow boiling in I.C. engine-like conditions at low flow velocities

Torregrosa

Broatch

Olmeda

et al. 2014

Experimental Thermal and Fluid Science

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Subcooled boiling flow is specially attractive for engine cooling system design, as no essential changes in its architecture are required while it is still possible to take advantage of the highest rates of heat transfer associated with nucleate boiling, mostly at high engine loads. In this paper, experiments on subcooled boiling flow in representative temperature conditions were conducted with a usual engine coolant in the low velocity range, for which little information is available, even if it may be relevant when advanced thermal management strategies are used. The results were analyzed by comparison with a reference Chen-type model which provided reasonable results for relatively low wall temperatures, but with noticeable discrepancies at higher wall temperatures. Analysis of the deviations observed indicated a significant influence of the Prandtl number on the suppression factor, and the inclusion into the model of a first estimate of this effect produced a noticeable improvement in its results, thus suggesting that one such modified additive model may be useful for practical engine cooling applications.

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Factors Influencing Combustion Chamber Wall Temperatures in a Liquid-Cooled, Automotive, Spark-Ignition Engine

Cited by 30 publications

References 5 publications

A Note on Bubble Sizes in Subcooled Flow Boiling at Low Velocities in Internal Combustion Engine-Like Conditions

A Note on Bubble Sizes in Subcooled Flow Boiling at Low Velocities in Internal Combustion Engine-Like Conditions

Advances in Integrated Vehicle Thermal Management and Numerical Simulation

Experiments on subcooled flow boiling in I.C. engine-like conditions at low flow velocities

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