A direct comparison of unsteady influence of turbine with twin-entry and single-entry scroll on performance of internal combustion engine

Wei, Jiao; Xue, Yingxian; Deng, Kangyao; Yang, Mingyang; Liu, Ying

doi:10.1016/j.energy.2020.118638

Cited by 11 publications

(7 citation statements)

References 17 publications

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“…Different from single-entry turbine, flow fed to the two limbs of twin-entry turbine is always different from each other, therefore turbine performance parameters should be redefined. 23,24 To evaluate the contribution of the two limbs to turbine performance fairly, the turbine performance parameters are evaluated based on the law of energy conservation. Turbine performance parameters are defined as given equations ( 1)- (7).…”

Section: Experimental and Numerical Methodsmentioning

confidence: 99%

Study on a flow-field-based meanline model of nozzled twin-entry mix-flow turbine

Xue

Yang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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Variable geometry twin-entry turbine has advantages in fuel economy, low-end torque, emission and turbo-engine matching of internal combustion engine. The reliability of performance prediction method for nozzled twin-entry turbine is heavily dependent on the understanding of flow mechanism of the turbine which is always confronted by time-dependent unequal admissions. This paper establishes a new meanline model of a nozzled twin-entry turbine based on the internal flow features. Firstly, flow mechanism of the twin-entry turbine with a vaned nozzle under different admissions is investigated via an experimentally validated CFD method. Results clearly demonstrate that the flow distortion in spanwise direction caused by unequal admissions notably influences the turbine efficiency discrepancy between symmetric unequal admissions, especially the two partial admissions. The evolution of flow distortion in the nozzle passage is the key to the performance discrepancy, which is impossible to be considered by a conventional performance model of a nozzled twin-entry turbine. Inspired by this, a newly-designed meanline model, named ‘parallel nozzle’ is proposed. Specifically, a nozzle passage is divided into two parallel sub-passages in spanwise direction to consider the flow distortion in nozzle passage. The model is validated against the detailed CFD results in terms of both overall performance and detailed flow parameters over different admissions. Results prove that turbine performance and flow parameters are well predicted by the model. Specifically, the influence of admissions on nozzled twin-entry turbine performance and flow parameters can be predicted by the method in satisfying accuracy.

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Section: Experimental and Numerical Methodsmentioning

confidence: 99%

Study on a flow-field-based meanline model of nozzled twin-entry mix-flow turbine

Xue

Yang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

Self Cite

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show abstract

“…At present, in the field of gas turbine [1,2] exhaust temperature measurement, to prolong the service life of the temperature sensor, the temperature sensor is generally placed in a metal protection tube. During the temperature measurement process, due to the large volume of the protection tube, the temperature sensor and the measured The time for the medium to establish thermal equilibrium increases the response time of the sensor, resulting in that the sensor cannot sense the temperature change instantaneously and achieve effective tracking, and its output takes a long time to reach a steady-state.…”

Section: Introductionmentioning

confidence: 99%

Research of high temperature redundant thin film thermocouple

Sun

Teng

Guo

et al. 2022

J. Phys.: Conf. Ser.

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Using the two-way flow-heat and one-way thermo-solid coupling simulation analysis methods, the designed thin-film thermocouple is analyzed by finite element, and the flow field, temperature field, and structural field inside the sensor are obtained. The high-temperature redundant thin-film thermocouple working simulation test shows that: The response time of the designed thin-film thermocouple is less than 2 seconds, and the stress and deformation are within the required range under the operating temperature load and wind load.

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“…Moreover, multy-entry turbine should be characterized over an extended range of admission condition, and not only in full admission. The adoption of twin entry turbines, with a proper design of the exhaust circuit, can allow significant improvements in fuel consumption and transient response [13]. In order to correctly evaluate twin entry turbine performance, specific parameters have to be considered.…”

Section: Introductionmentioning

confidence: 99%

Experimental evaluation of isentropic efficiency in turbocharger twin-entry turbines

Usai

Cordalonga

Marelli

2022

J. Phys.: Conf. Ser.

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Turbocharging plays a fundamental role not only in improving the performance of automotive engines, but also in reducing the fuel consumption and exhaust emissions of spark-ignited biofuel, diesel, liquid, and gaseous engines. Dedicated experimental investigations on turbochargers are therefore needed to evaluate a better understanding of its performance. The availability of experimental information on the steady flow performance of the turbocharger is an essential requirement to optimize the matching calculation. It is interesting to know the isentropic efficiency of the turbine in order to improve the coupling with the engine, in particular it is difficult to identify the definition of the turbine efficiency through a direct evaluation. In a radial turbine, the isentropic efficiency, evaluated directly starting from the measurement of the thermodynamic quantities at the inlet and outlet sections, can be affected by significant errors. This inaccuracy is mainly related to the incorrect evaluation of the turbine outlet temperature, due to the non-uniform distribution of the flow field in the measurement section. For this purpose, a flow conditioner was installed downstream the turbine. Tests were performed at different values of the rotational speed, and in quasi-adiabatic conditions. The flow field downstream the de-coupler was analysed through a hand-made three-hole probe with an exposed junction thermocouple inserted in the pipe with different protrusions. Thanks to this experimental campaign, it was possible to measure pressure, velocity, mass flow and temperature profiles necessary to examine the homogeneity of the flow field. As the turbocharger is fitted with a twin entry turbine, the thermodynamic quantities have been properly taken into account referring to each sector.

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A direct comparison of unsteady influence of turbine with twin-entry and single-entry scroll on performance of internal combustion engine

Cited by 11 publications

References 17 publications

Study on a flow-field-based meanline model of nozzled twin-entry mix-flow turbine

Study on a flow-field-based meanline model of nozzled twin-entry mix-flow turbine

Research of high temperature redundant thin film thermocouple

Experimental evaluation of isentropic efficiency in turbocharger twin-entry turbines

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