Direct Heat Loss to Combustion Chamber Walls in a Direct-Injection Diesel Engine~Evaluation of Direct Heat Loss to Piston Top Land

Suzuki, Yasuko; Terauchi, Kazumichi; Emi, Masahiko; Shimano, Kenjiro; Enomoto, Yoshiteru

doi:10.4271/2005-08-0547

Cited by 2 publications

(8 citation statements)

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“…In comparison, the temperature range for the entire piston top land was lower and the temperature amplitude was also smaller. 19 The measured temperature range at the cylinder head was lower than that of the piston, and the temperature tended to decrease from bore center toward outside of the cylinder head.…”

Section: Tftsmentioning

confidence: 96%

“…As a result, heat transfer from piston top land through the crevice to the cylinder liner was registered. 19 In authors' past studies, an experiment that changed the relation between the point of measurement and the direction of fuel injection by rotating the direction of fuel injection circumferentially was conducted. 25 Moreover, coincident measurement of the heat fluxes at the points of fuel splay impinging and not impinging on the cavity side was also performed.…”

Section: Tftsmentioning

confidence: 99%

“…The temperature scales of the vertical axis differ for the piston, cylinder liner, cylinder head and the intake/exhaust valves because the temperature ranges of these combustion chamber wall surfaces are all different. [18][19][20][21] For the piston, high temperatures were measured at the points around the inner circumference of the top surface and the upper part of the cavity side wall. 18 This was as a result of the contact with the hot combustion flame.…”

Section: Tftsmentioning

confidence: 99%

“…In this study, the new TFTs were used to obtain T w and q from 100 points on all the combustion chamber wall surfaces of a naturally aspirated, direct-injection (DI) diesel engine. [18][19][20][21] This article describes the process of deriving a g and a gm for all the combustion chamber wall surfaces of the DI diesel engine based on the measured data and the results thus obtained. In addition, a comparison was made of the experimentally measured a gm values and the values of a E and a W calculated, respectively, with Eichelberg's and Woschni's empirical equations for different engine speeds and ignition timings.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Heat transfer coefficient on the combustion chamber wall surfaces in a naturally aspirated direct-injection diesel engine

Enomoto

Aoki

Emi

et al. 2013

International Journal of Engine Research

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Thin-film thermocouples were used to measure the instantaneous temperature at 100 points on all the combustion chamber wall surfaces in a naturally aspirated direct-injection diesel engine. Instantaneous heat flux at each measured point was also obtained through heat transfer analysis with the measured instantaneous wall surface temperature applied as a boundary condition. In addition, the instantaneous mass-averaged gas temperature in the combustion chamber was calculated through the equation of state of an ideal gas. As a result, the local and overall heat transfer coefficients were evaluated using the corresponding wall surface temperatures and heat fluxes. The overall heat transfer coefficients thus obtained were compared with those calculated with Eichelberg's and Woschni's empirical equations for five ignition timings and three engine speeds. As a result, it was revealed that an overall average heat transfer coefficient obtained through the authors' experiments has characteristics different from those of the heat transfer coefficients calculated from the empirical equations proposed by Eichelberg and Woschni.

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Section: Tftsmentioning

confidence: 96%

Section: Tftsmentioning

confidence: 99%