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

Pérez-García, J.; Sanmiguel‐Rojas, E.; Viedma, A.

doi:10.1016/j.expthermflusci.2008.09.002

Cited by 18 publications

(7 citation statements)

References 15 publications

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“…In the current study, the representative of the compressible flow at junctions is the study by Abou-haidar 7 and Perez-Garci. [8][9][10] Abou-Haidar 7 tested the flow losses of T-junctions with different branch angles and different flow ratios over a wide range of airflow Mach numbers. The results revealed that the pressure loss coefficient of branch junction flow is related to the Mach number of the air flow.…”

Section: Introductionmentioning

confidence: 99%

“…However, the internal flow field of the T-junction was not tested in this study. Perez-Garci et al [8][9][10] conducted a pilot study of a pressure loss model in a right-angled T-junction and introduced a new pressure loss coefficient to recharacterize the pressure loss. It was found that for the air flowing through the junction with a higher Mach number, the pressure loss coefficient is related not only to the flow ratio q between the branch pipe and the common pipe but also to the Mach number in the common pipe.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study on a new pressure loss model of T-junction for compressible flow with particle image velocimetry test

Zhang

Zhu

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part A:

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The energy transfer and conversion of exhaust gas flowing across junctions of exhaust manifold plays an important role in determining performance of turbocharging system. With the increase of engine boost pressure, exhaust gas velocity increases significantly, which increased compressibility of exhaust gas flow simultaneously. The existed exhaust T-junction models that do not take gas compressibility into consideration are not capable to simulate the exhaust gas flow with high boost pressure good enough. In order to predict pressure loss coefficients of high-pressure gas flow with higher accuracy, this paper developed a new T-junction models in which compressibility of gas flow was taken into consideration. A particle image velocimetry (PIV) test rig was established to provide data for investigating influences of flow parameters on the flow state and thermodynamic parameters in the T-junction. The results show that there are obvious streamline contractions in the internal flow field of the junction, and the formed boundary streamline divides the junction into two regions, as the flow ratio increases, the absolute value of the vorticity increases, and the vorticity in most areas of the branch joint is zero. In addition, the flow ratio of the branch pipe and the main pipe and the Mach number of the outflow affect the flow of the junction. Based on the results of the PIV test, a new pressure loss coefficient T-junction model for compressible flow is proposed. The new model has good prediction accuracy of the pressure loss coefficient and the prediction accuracy of the exhaust pressure wave increases by 4.43% when the pressure coefficient model is used in one-dimensional simulation program.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on a new pressure loss model of T-junction for compressible flow with particle image velocimetry test

Zhang

Zhu

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part A:

View full text Add to dashboard Cite

show abstract

“…Unfortunately, in all these studies, the results were also concluded in incompressible form, because the experiments were performed only within narrowspeed ranges. The only comprehensive sources of steady flow test data are those provided by Abou-Haidar and Dixon 22 and Perez-Garcia et al [23][24][25] Abou-Haidar and Dixon 22 completed experimental investigations on T-junctions with different branch angles and flow ratios in a wide Mach number range up to chocked flow conditions at junctions. They measured the effects of fluid compressibility on loss coefficients and indicated that the coefficients do vary with Mach number.…”

Section: Introductionmentioning

confidence: 99%

An experimental study of compressible combining flow at 45° T-junctions

Wang

Lü

Deng

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part C:

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Junction flow loss is one of the sources of flow losses in many engineering pipe systems. An experimental study was carried out in order to investigate the combining steady pressure loss coefficients at 45° T-junctions with three area ratios between lateral branch and main duct. Extensive measurement data were obtained at a wide range of Mach number (0.1–0.6) and mass flow rate ratios using air as the tested fluid. Comparative analysis of the results includes the pressure difference in the two flow paths of the junction, the effect of Mach number in common branch due to gas compressibility, as well as the loss coefficients with various geometry condition. The following conclusion is drawn: the total pressure loss coefficient ( K) was mainly dependent on the Mach number ( M3), mass flow rate ratio ( q), and area ratio ( a), while almost independent on Reynolds number. The results provide reference for the research of junction flow and can be valuable in the correction of the boundary condition in one-dimensional simulation models.

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“…When the public manifold Mach number is greater than 0.2, the pressure loss coefficients between the calculated and experimental were quite different. In papers [7][8][9], some experimental research on the pressure loss model of the exhaust manifold junction of the "T" type was done. The research showed that the pressure loss coefficient was related not only to the flow ratio between the public manifold and branch manifold but also to the Mach number in the public manifold.…”

Section: Introductionmentioning

confidence: 99%

Preliminary Experimental Study on Pressure Loss Coefficients of Exhaust Manifold Junction

Zhang

Wang

et al. 2014

International Journal of Rotating Machinery

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The flow characteristic of exhaust system has an important impact on inlet boundary of the turbine. In this paper, high speed flow in a diesel exhaust manifold junction was tested and simulated. The pressure loss coefficient of the junction flow was analyzed. The steady experimental results indicated that both of static pressure loss coefficientsL13andL23first increased and then decreased with the increase of mass flow ratio of lateral branch and public manifold. The total pressure loss coefficientK13always increased with the increase of mass flow ratio of junctions 1 and 3. The total pressure loss coefficientK23first increased and then decreased with the increase of mass flow ratio of junctions 2 and 3. These pressure loss coefficients of the exhaust pipe junctions can be used in exhaust flow and turbine inlet boundary conditions analysis. In addition, simulating calculation was conducted to analyze the effect of branch angle on total pressure loss coefficient. According to the calculation results, total pressure loss coefficient was almost the same at low mass flow rate of branch manifold 1 but increased with lateral branch angle at high mass flow rate of branch manifold 1.

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

Cited by 18 publications

References 15 publications

Study on a new pressure loss model of T-junction for compressible flow with particle image velocimetry test

Study on a new pressure loss model of T-junction for compressible flow with particle image velocimetry test

An experimental study of compressible combining flow at 45° T-junctions

Preliminary Experimental Study on Pressure Loss Coefficients of Exhaust Manifold Junction

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