Investigation of the mixed flow turbine performance under inlet pulsating flow conditions

Hamel, Mohammed; Abidat, M.; Litim, Sid Ali

doi:10.1016/j.crme.2012.01.004

Cited by 14 publications

(4 citation statements)

References 14 publications

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“…The results showed a significant deviation between the hysteresis loop at the rotor inlet during pulsating flow compared to that at steady flow conditions, although the collapse of the hysteresis loop into a single line during the propagation from the volute inlet to the rotor inlet. The former study strongly agreed with that done by Hamel et al [20],…”

Section: Introductionsupporting

confidence: 92%

Computational Study of a Radial Flow Turbine Operates Under Various Pulsating Flow Shapes and Amplitudes

Rezk

Sharma

Barrans

et al. 2021

Journal of Energy Resources Technology

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Radial flow turbines are extensively used in turbocharging technology due to their unique capability of handling a wide range of exhaust gas flow. The pulsating flow nature of the internal combustion engine exhaust gases causes unsteady operation of the turbine stage. This paper presents the impact of the pulsating flow of various characteristics on the performance of a radial flow turbine. A three-dimensional computational fluid dynamic model was coupled with a one-dimensional engine model to study the realistic pulsating flow. Applying square wave pulsating flow showed the highest degree of unsteadiness corresponding to 92.6% maximum mass flow accumulation due to the consecutive sudden changes of the mass flowrates over the entire pulse. Although sawtooth showed a maximum mass flow accumulation value of 88.9%, the mass flowrates entailed gradual change and resulted in the least overall mass flow accumulation over the entire pulse. These two extremes constrained the anticipated performance of the radial flow turbine that operates under realistic pulsating flow. Such constraints could develop an operating envelope to predict the performance and optimize radial flow turbines’ power extraction under pulsating flow conditions.

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Section: Introductionsupporting

confidence: 92%

Computational Study of a Radial Flow Turbine Operates Under Various Pulsating Flow Shapes and Amplitudes

Rezk

Sharma

Barrans

et al. 2021

Journal of Energy Resources Technology

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“…Hamel and al. [17] conducted a steady and unsteady flow performance analyses and a numerical performance prediction of a mixed flow turbine under inlet pulsating flow conditions. Sakai and al.…”

Section: Introductionmentioning

confidence: 99%

Effect Of Speeds and Under Inlet Pulsating Flow Conditions onthePerformance ofthe Twin-Entry Mixed Flow Turbine

2020

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This study has highlighted how the needs of drastically reduces carbon, pollutant emissions andenergy recovery in vehicle propulsion systems. The object of this research is to reduce emissions of gaspollutants by investigating the impact of speed and frequency towards the automotive turbocharger. This willdefinitely lead to a reduction in fuel consumption leading to a reduction in the amount of CO2 gas emissions.The present work is conducted with the view to push one step closer towards the full incorporation of thepulsating flow efficiency in the turbine design. In addition, the pulse frequency and the pulsating flowfrequency effects the performances of the turbine are analyzed. The numerical results of the present study arecompared with the experimental data. ANSYS-CFX software is used to solve the equations of a viscous,compressible, highly unsteady and three dimensional turbine inflows. The simulations are conducted at 29,500rpm, 41,500 rpm and 59,740 rpm and respectively at 50%,70% and 100% design speed for both 40 Hz, 56,8 Hzand 80 Hz pulsating flow inlet conditions

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“…Furthermore, their results showed that the turbine performance is significantly sensitive to the rotational speed. Hamel et al [10] reported the capability of the k-ε turbulence model and the frozen rotor approach to give accurate results of the turbine performance. Karamanis et al [11] investigated on a mixed flow turbine at five different rotational speeds under steady conditions.…”

Section: Introductionmentioning

confidence: 99%

Influence of Rotor Speed on Mixed Flow Turbine Performance

Ketata¹,

Driss²

2017

AJME

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The radial turbine which is an important component of a turbocharger is used in automotive applications in order to enhance internal combustion engines performance. In the recent years, the radial turbine is commonly replaced instead of a mixed flow one. In fact, the mixed flow turbine yields to better aerodynamic performance at lower isentropic velocity ratio compared to the radial configuration. This present paper shows our numerical model under various steady conditions in purpose to understand the effect of the rotational speed on the turbine performance. Numerical simulations are conducted by solving the Reynolds averaged Navier Stokes equations using the CFX 17.0 package including a finite volume method for the discretization. To close these equations, the standard k-ε turbulence model is chosen. Our numerical model succeeds to predict the turbine performance and the swallowing capacity with an acceptable accuracy. Besides, the peak efficiency and the choking mass flow are computed for different operating conditions. Equally, the turbine reaction degree and power are given for each studied rotational speed. Then, the distribution of the total loss within the turbine is obtained numerically at different operating conditions.

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Investigation of the mixed flow turbine performance under inlet pulsating flow conditions

Cited by 14 publications

References 14 publications

Computational Study of a Radial Flow Turbine Operates Under Various Pulsating Flow Shapes and Amplitudes

Computational Study of a Radial Flow Turbine Operates Under Various Pulsating Flow Shapes and Amplitudes

Effect Of Speeds and Under Inlet Pulsating Flow Conditions onthePerformance ofthe Twin-Entry Mixed Flow Turbine

Influence of Rotor Speed on Mixed Flow Turbine Performance

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