Flow Losses at Circular T-Junctions Representative of Intake Plenum and Primary Runner Interface

Christian, Adam; Selamet, Ahmet; Miazgowicz, Keith; Tallio, K. V.

doi:10.4271/2004-01-1414

Cited by 8 publications

(9 citation statements)

References 10 publications

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“…The most reliable and complete reference data are: Miller [6], 73022 and 73023 ESDU items [7,8] and Idelchick [9]. Some recent works, such as Sierra-Espinosa et al [10,11], Adechy and Issa [12], Christian et al [13], Oka and Ito [14] and Costa et al [15] prove the interest of the topic studied. In these works, different aspects of the flow behaviour and methodologies to discount the friction losses and to obtain the extrapolated flow properties up to the junction have been established.…”

Section: Introductionmentioning

confidence: 88%

New experimental correlations to characterize compressible flow losses at 90-degree T-junctions

Pérez-García

Sanmiguel‐Rojas

Viedma

2009

Experimental Thermal and Fluid Science

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Section: Introductionmentioning

confidence: 88%

New experimental correlations to characterize compressible flow losses at 90-degree T-junctions

Pérez-García

Sanmiguel‐Rojas

Viedma

2009

Experimental Thermal and Fluid Science

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“…The most reliable and complete reference data are: Miller [9], 73022 and 73023 ESDU items [10,11] and Idelchick [12]. Some recent works, such as Sierra-Espinosa et al [13,14], Adechy and Issa [15], Christian et al [16], Oka and Ito [17] and Costa et al [18] demonstrate the interest of the topic studied. In these works, different aspects of the flow behaviour and methodologies to discount the friction losses, obtain the extrapolated flow properties up to the junction and then calculate the loss coefficient have been established.…”

Section: Introductionmentioning

confidence: 90%

“…Finally, in all cases studied the parameters K and F are K = O(1) and F = O(1) which demonstrate that extrapolation procedure do not introduce additional uncertainty, Eq. (16).…”

Section: Uncertainty Propagation In the Loss Coefficient Defined By Mmentioning

confidence: 95%

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New coefficient to characterize energy losses in compressible flow at T-junctions

Pérez-García

Sanmiguel‐Rojas

Viedma

2010

Applied Mathematical Modelling

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a b s t r a c tA new coefficient to characterize the global behaviour of adiabatic compressible flow at T-junctions is proposed. The new coefficient is defined according to the conclusions derived from the uncertainty propagation analysis of the total pressure loss coefficient defined by Miller for compressible flow. The numerical results obtained using the new linking between branches coefficient definition, K , show a logarithmic relationship with mass flow rate ratio between branches, q, and the extrapolated Mach number in the common branch, M Ã 3 , for all flow types studied in a 90°T-junction. Reliable and practical two parameters or global correlations, K ¼ K ðM Ã 3 ; qÞ, have been obtained. These correlations can be easily implemented as boundary conditions into 1D global simulation codes.

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“…BENSON applied this model to solve one-dimensional flow in an engine exhaust system and concluded that the pressure loss model was more similar to the actual condition than the constant pressure model. Thus, the pressure loss model is widely used to study a variety of exhaust systems [2][3] . Based on the theoretical derivations of BASSETT and other researchers [4][5][6] , the total pressure loss coefficient formula for a variety of flow types of the T-junction has been determined.…”

Section: Introduction mentioning

confidence: 99%

Modified pressure loss model for T-junctions of engine exhaust manifold

Wang

Cui

et al. 2014

Chin. J. Mech. Eng.

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The T-junction model of engine exhaust manifolds significantly influences the simulation precision of the pressure wave and mass flow rate in the intake and exhaust manifolds of diesel engines. Current studies have focused on constant pressure models, constant static pressure models and pressure loss models. However, low model precision is a common disadvantage when simulating engine exhaust manifolds, particularly for turbocharged systems. To study the performance of junction flow, a cold wind tunnel experiment with high velocities at the junction of a diesel exhaust manifold is performed, and the variation in the pressure loss in the T-junction under different flow conditions is obtained. Despite the trend of the calculated total pressure loss coefficient, which is obtained by using the original pressure loss model and is the same as that obtained from the experimental results, large differences exist between the calculated and experimental values. Furthermore, the deviation becomes larger as the flow velocity increases. By improving the Vazsonyi formula considering the flow velocity and introducing the distribution function, a modified pressure loss model is established, which is suitable for a higher velocity range. Then, the new model is adopted to solve one-dimensional, unsteady flow in a D6114 turbocharged diesel engine. The calculated values are compared with the measured data, and the result shows that the simulation accuracy of the pressure wave before the turbine is improved by 4.3% with the modified pressure loss model because gas compressibility is considered when the flow velocities are high. The research results provide valuable information for further junction flow research, particularly the correction of the boundary condition in one-dimensional simulation models.

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Flow Losses at Circular T-Junctions Representative of Intake Plenum and Primary Runner Interface

Cited by 8 publications

References 10 publications

New experimental correlations to characterize compressible flow losses at 90-degree T-junctions

New experimental correlations to characterize compressible flow losses at 90-degree T-junctions

New coefficient to characterize energy losses in compressible flow at T-junctions

Modified pressure loss model for T-junctions of engine exhaust manifold

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