Characterization of two-stage turbine system under steady and pulsating flow conditions

Zhao, Rongchao; Li, Weihua; Zhuge, Weilin; Zhang, Yangjun; Yin, Yueping; Wu, Yonghui

doi:10.1016/j.energy.2018.01.125

Cited by 29 publications

(18 citation statements)

References 37 publications

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“…It is an interesting phenomenon and seems to be unresonable. Actually, the pulse amplitude will affect the power split between the HPT and LPT, which was reported in a previous study [29]. As the pulse amplitude increases, more power will be distributed to the LPT.…”

Section: Flow Loss Analysis Of Two-stage Turbine Under Pulsating Condmentioning

confidence: 67%

“…As for the MFP prediction, the average difference is 1.33%. As for the unsteady calculation, the method applied in the current study is the same as that in the previous study [29]. Therefore, the simulation method in the current study is trustworthy.…”

Section: Cfd Validationmentioning

confidence: 93%

“…In the current study, the impact of pulse amplitude on the flow loss was studied. As shown in Figure 3, the inlet total pressure profiles are the same as the profiles in [29]. The adjusting method is presented in Equation (1).…”

Section: Geometrical Feature Dimensionmentioning

confidence: 99%

“…However, as the development of turbo-compound [26,27] and two-stage turbocharging technologies [28] has progressed, two-stage turbine systems have been widely applied in automotive engines. Zhao [29] reported the characteristics of a two-stage turbine system under steady and pulsating flow conditions. It was found that the load split between the high-pressure turbine (HPT) and low-pressure turbine (LPT) was changed under pulsating condition.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Unsteady Flow Loss Mechanism and Aerodynamic Improvement of Two-Stage Turbine under Pulsating Conditions

Zhao

Zhuge

et al. 2019

Entropy

Self Cite

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The developments of two-stage turbocharging and turbocompounding promote the application of the two-stage turbine system in internal combustion engines. Since the turbine suffers from the pulsating exhaust, the performance deteriorates significantly from steady conditions. In the paper, the pulsating flow losses in the two-stage turbine are analyzed and a control method is proposed to improve the turbine performance. ANSYS CFX, which is a commercial software for computational fluid dynamic, is applied to resolve the three-dimensional unsteady flow problem. The accuracy of the simulation method is verified by the experimental data from each turbine. Firstly, the impacts of pulse amplitudes on transient loss of each component of the two-stage turbine are studied. Then flow field analysis is carried out to understand details of the unsteady flows. It is found that the variation of incidence angle at the low-pressure turbine (LPT) rotor tip is significantly larger than that at rotor hub, which causes severe flow loss near leading edge. As a result, the LPT performance drops down significantly. To improve the LPT performance, the blade shape at tip is modified. The aerodynamic performances of turbines with three different shapes under high- and low-load pulsating flow conditions are evaluated. It is found that increased inlet blade angle and medium thickness achieves good aerodynamic performance. The rotor averaged efficiency is improved by 2.27% under high-load pulsating condition.

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Section: Flow Loss Analysis Of Two-stage Turbine Under Pulsating Condmentioning

confidence: 67%

Section: Cfd Validationmentioning

confidence: 93%

Section: Geometrical Feature Dimensionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Unsteady Flow Loss Mechanism and Aerodynamic Improvement of Two-Stage Turbine under Pulsating Conditions

Zhao

Zhuge

et al. 2019

Entropy

Self Cite

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“…Various defects were discussed to which different types of solutions have been found out [7,10]. Few of the theoretical study that took place is on the two stage system turbine system under steady and pulsating flow, flameless combustion towards gas turbines and many other such departments of physical strains that can affect the turbine [1,3,5,8]. Many positives were also been mentioned such as increasing the number of stages in a turbine from 2 to 5 without leaving the effective cantilever arrangement using the Organic Rankine Cycle (ORC).…”

Section: Literature Review Theoretical Analysis On Axial Flow Turbinementioning

confidence: 99%

The Numerical Simulation and Evaluation of Aircraft Engine Axial Flow Turbine using Numerical Techniques

al.¹

2019

IJMPERD

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This research aims to improve the efficiency of an axial flow turbine by improving the boundary conditions. In the baseline paper, Sherwood number, Nusselts number for a given flow were determined. The pressure ratio was not considered in the paper. Research has been done to improve the values by considering the pressure difference which was neglected in the base line paper. Axial flow turbines expand the flow passing through it. Losses like tip losses, efficiency losses and loss on blades due to heat are high and needs to be looked after. A comprehensive literature study was carried out for the better understanding of axial flow turbines, recent developments and to analyze the control of loses.

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Features of Pulsating Flows Thermomechanics in Exhaust System of Piston Engine with Turbocharging

Plotnikov

Brodov

Григорьев

2019

Lecture Notes in Mechanical Engineering

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Characterization of two-stage turbine system under steady and pulsating flow conditions

Cited by 29 publications

References 37 publications

Unsteady Flow Loss Mechanism and Aerodynamic Improvement of Two-Stage Turbine under Pulsating Conditions

Unsteady Flow Loss Mechanism and Aerodynamic Improvement of Two-Stage Turbine under Pulsating Conditions

The Numerical Simulation and Evaluation of Aircraft Engine Axial Flow Turbine using Numerical Techniques

Features of Pulsating Flows Thermomechanics in Exhaust System of Piston Engine with Turbocharging

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