Thermal Studies in the Exhaust Manifold of a Turbocharged V6 Diesel Engine Operating Under Steady-State Conditions

Battiston, Paul A.; Alkidas, A. C.

doi:10.4271/2006-01-0688

Cited by 6 publications

(5 citation statements)

References 13 publications

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“…This increase caused by back flow phenomena is especially common for points downstream the exhaust valve, as it is the case of the current point of measurement. Similar results were reported in the works published by other researchers on this field [2,[46][47][48].…”

Section: Presentation and Discussion Of The Experimental Resultssupporting

confidence: 94%

“…In the largest part of the closed engine cycle, gas in the exhaust manifold presents almost zero speed and its temperature decreases linearly with a slow pace. The characteristics of the exhaust gas temperature variation presented above, both for its instantaneous and mean values, are in agreement with the corresponding simulated results for the exhaust manifold of a diesel engine presented in [48].…”

Section: Presentation and Discussion Of The Experimental Resultssupporting

confidence: 86%

“…To provide a reasonable explanation for this result, we have to consider that the exhaust manifold heat transfer is driven by much higher flow velocities than the in-cylinder heat transfer [2,48]. At the same time, gas temperature at a distance of 100 mm downstream the exhaust manifold (where the measuring position exists) is already reduced substantially due to heat losses.…”

Section: Presentation and Discussion Of The Experimental Resultsmentioning

confidence: 96%

“…The pressure waves interact with the pipe junctions and ends in the exhaust manifold [2,[46][47][48]. These interactions cause pressure waves to be reflected back towards the engine cylinder.…”

Section: Presentation and Discussion Of The Experimental Resultsmentioning

confidence: 99%

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Experimental Assessment of Instantaneous Heat Transfer in the Combustion Chamber and Exhaust Manifold Walls of Air-Cooled Direct Injection Diesel Engine

Mavropoulos¹,

Rakopoulos²,

Hountalas³

2008

SAE Int. J. Engines

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An experimental analysis is carried out to investigate several heat transfer characteristics during the engine cycle, in the combustion chamber and exhaust manifold walls of a direct injection (DI), air-cooled, diesel engine. For this purpose, a novel experimental installation has been developed, which separates the engine transient temperature signals into two groups, namely the longand the short-term response ones, processing the respective signals in two independent data acquisition systems. Furthermore, a new pre-amplification unit for fast response thermocouples, appropriate heat flux sensors and an innovative, object-oriented, control code for fast data acquisition have been designed and applied. Experimentally obtained cylinder pressure diagrams together with semi-empirical equations for instantaneous heat transfer were used as basis for the calculation of overall heat transfer coefficient. On the other hand, one-dimensional heat conduction theory with Fourier analysis techniques combined with an iterative procedure between calculated and measured temperature data are implemented, in order to calculate the instantaneous local engine cylinder heat transfer coefficients in the cylinder head surfaces. For the exhaust manifold, the local gas temperature was calculated based on a thermal-zone model approach developed. Analysis of experimental results revealed significant differences between the overall and local peak heat transfer coefficient values in the cylinder head surface. The effect of engine speed and load as well as the effect of air-swirling motion on cylinder head heat transfer coefficient variation are presented and quantified, revealing the significant influence of turbulence on local heat transfer conditions. The effect of valve motion on instantaneous heat transfer is also depicted and quantified. Analysis of the results for the instantaneous wall temperatures and heat transfer coefficient on the exhaust manifold reveals interesting details regarding the flow of exhaust gases, both in the blowdown and displacement phases of the engine exhaust stroke. From the results it is concluded that the instantaneous heat transfer coefficient variation for engine combustion chamber is highly non-uniform, unlike its values calculated from standard correlations that assume spatial uniformity. This is very important, since especially for air-cooled diesel engines limited relevant information seems to exist in the literature.

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Section: Presentation and Discussion Of The Experimental Resultssupporting

confidence: 94%

Section: Presentation and Discussion Of The Experimental Resultssupporting

confidence: 86%

Section: Presentation and Discussion Of The Experimental Resultsmentioning

confidence: 96%

Section: Presentation and Discussion Of The Experimental Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Experimental Assessment of Instantaneous Heat Transfer in the Combustion Chamber and Exhaust Manifold Walls of Air-Cooled Direct Injection Diesel Engine

Mavropoulos¹,

Rakopoulos²,

Hountalas³

2008

SAE Int. J. Engines

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“…The approximate value of T g = 640 • C was considered. The temperature of the manifold wall was estimated from measurements in the works of Cardoso and Andreatta [2016] and He et al [2006] as T w = 380 • C. The thermal expansion ratio of the material, which varies with temperature, was obtained in Yang et al [2013] and is shown in Figure 84. Therefore, the thermal variation of the manifold material can be taken as ∆L/L 0 = 0.005.…”

Section: The Exhaust Manifoldmentioning

confidence: 99%

A new method of rigid assemblies stochastic 3D tolerance analysis including thermal performance.

Umaras¹

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Positional and orientation tolerances are specified in the components of a mechanical assembly and are of great importance in design, as they affect its quality, reliability, and cost. Tolerance analysis is a method of stacking the tolerances parts of an assembly to achieve an overall value in a given direction. The opposite approach is tolerance synthesis, or allocation, where the tolerances of the components are adjusted through a determined criterion for compliance with design constraints or for optimization purposes, such as cost reduction. The tolerance synthesis is generally performed when the results of a tolerance analysis process do not reach a design constraint requirement. The aim of this thesis is to propose a new method for tolerance analysis in a three-dimensional domain, including manufacturing simulation and consideration of functional thermal effects. A case study involving an internal combustion engine shows the efficacy of the method. Manufacturing simulation based on the Monte Carlo method provides a statistical distribution representation of process variation along a specified tolerance range. This resource can lead to optimization of the tolerance range of the mechanical assembly in each orthogonal direction and can also be a significant aid in design decisions and the selection of manufacturing processes. A feature of the proposed method is the consideration of geometric position tolerances as a function of orientation tolerances. The feature results in great accuracy at a high manufacturing volume. The method is application-oriented and can be applied effectively in the industry.

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Integrated Simulation of the Engine and Control System of a Turbocharged Diesel Engine

Lin¹,

Gangopadhyay²

2006

SAE Technical Paper Series

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Thermal Studies in the Exhaust Manifold of a Turbocharged V6 Diesel Engine Operating Under Steady-State Conditions

Cited by 6 publications

References 13 publications

Experimental Assessment of Instantaneous Heat Transfer in the Combustion Chamber and Exhaust Manifold Walls of Air-Cooled Direct Injection Diesel Engine

Experimental Assessment of Instantaneous Heat Transfer in the Combustion Chamber and Exhaust Manifold Walls of Air-Cooled Direct Injection Diesel Engine

A new method of rigid assemblies stochastic 3D tolerance analysis including thermal performance.

Integrated Simulation of the Engine and Control System of a Turbocharged Diesel Engine

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