Direct Heat Loss to Combustion Chamber Walls in a D.I. Diesel Engine-Development of Measurement Technique and Evaluation of Direct Heat Loss to Cylinder Liner Wall

Sugihara, Takeshi; Shimano, Kenjiro; Enomoto, Yoshiteru; Suzuki, Yasuko; Emi, Masahiko

doi:10.4271/2007-24-0006

Cited by 6 publications

(10 citation statements)

References 12 publications

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“…1 Although the combustion gases move close to the liner in the late expansion stroke, the gas temperature is much lower (see Figure 5(a)). Sugihara et al 48 found that the heat transfer losses from the cylinder liner are 3.6%-4.8%, which agrees well with the present results. Consistent findings have also been revealed by other related studies.…”

Section: Distributions Of Heat Transfer Losses In Different Componentssupporting

confidence: 92%

Effect of combustion regime on in-cylinder heat transfer in internal combustion engines

Jia

Gingrich

Wang

et al. 2015

International Journal of Engine Research

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A multi-dimensional model was applied to investigate the influence of combustion regimes on heat transfer losses in internal combustion engines. By utilizing improved turbulence and heat transfer sub-models, the combustion and heat transfer characteristics of the engine were satisfactorily reproduced for operation under conventional diesel combustion, homogeneous charge compression ignition, and reactivity controlled compression ignition regimes. The results indicated that the total heat transfer losses of conventional diesel combustion are the largest among the three combustion regimes due to the direct interaction of the high-temperature flame with the piston wall, while the heat transfer losses of reactivity controlled compression ignition are the lowest and nearly are independent of combustion phasing because of the avoidance of high-temperature regions adjacent to the cylinder walls. Compared to conventional diesel combustion, homogeneous charge compression ignition shows more potential for the reduction of exhaust energy and improvement of fuel efficiency. In reactivity controlled compression ignition combustion, the reduction of heat transfer and exhaust losses outweigh its increase in combustion losses and offer the opportunity for further improvement of fuel efficiency. Furthermore, by evaluating the widely used Woschni and Chang et al.'s empirical heat transfer correlations, it was found that both correlations considerably overestimate the heat transfer rate for the reactivity controlled compression ignition regime. It is necessary to improve empirical heat transfer models to take account of the flow and combustion characteristics under various combustion modes.

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Section: Distributions Of Heat Transfer Losses In Different Componentssupporting

confidence: 92%

Effect of combustion regime on in-cylinder heat transfer in internal combustion engines

Jia

Gingrich

Wang

et al. 2015

International Journal of Engine Research

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show abstract

“…Looking at a g for measured points C1 and C2, it is seen that the values peaked right after TDC and then soon declined. Based on the previously obtained results for the cylinder liner of this experimental engine, 20 it is assumed that the increase in the apparent local heat transfer coefficient is attributed to a greater heat flux resulting from the temperature increase of the unburned gas in the piston top land crevice due to compression of the gas by the expansion of the already burned combustion gas. The next increase in the apparent local heat transfer coefficient is seen after a crank angle of approximately 27°ATDC, which is presumably attributed to increased heat flux when the combustion gas reached the cylinder liner wall surface accompanying the descent of the piston.…”

Section: Apparent Local Heat Transfer Coefficientmentioning

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%

“…Figure 3 shows a signal processing system for the instantaneous temperature measurements on combustion chamber wall surfaces. 20 The thermocouple wires from the piston were led out through a link devise without being cut off and shielded to prevent electric noise. 22 A resin adhesive with low thermal conductivity l = 1.57 W/(m K) was used to embed the Loex-constantan TFT into piston and cylinder head and C35-constantan TFT into cylinder liner.…”

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%

See 2 more Smart Citations

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

Self Cite

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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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CFD–CHT calculation method using Buckingham Pi-Theorem for complex fluid–solid heat transfer problems with scattering boundary conditions

Hölz¹,

Böhlke

Krämer³

2018

Automot. Engine Technol.

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Direct Heat Loss to Combustion Chamber Walls in a D.I. Diesel Engine-Development of Measurement Technique and Evaluation of Direct Heat Loss to Cylinder Liner Wall

Cited by 6 publications

References 12 publications

Effect of combustion regime on in-cylinder heat transfer in internal combustion engines

Effect of combustion regime on in-cylinder heat transfer in internal combustion engines

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

CFD–CHT calculation method using Buckingham Pi-Theorem for complex fluid–solid heat transfer problems with scattering boundary conditions

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