Study of Unsteady Performance of a Twin-Entry Mixed Flow Turbine

2016 ◽  
Keyword(s):  
Mixed Flow ◽  
Unsteady Performance

TURBODYNA: Centrifugal/Centripetal Turbomachinery Dynamic Simulator and its Application on a Mixed Flow Turbine

2019 ◽  
Author(s):  
Bijie Yang ◽  
Ricardo Martinez-Botas
Keyword(s):  
Flow Field ◽  
Performance Prediction ◽  
Pressure Wave ◽  
Response Assessment ◽  
System Response ◽  
Mixed Flow ◽  
Dynamic Simulator ◽  
Unsteady Performance ◽  
1D Modelling ◽  
Rotor Mass

Abstract 1D modelling is crucial for turbomachinery unsteady performance prediction and system response assessment. The purpose of the paper is to describe a newly developed 1D modelling (TURBODYNA) for turbomachinery. Different from classic 1D modelling, in TURBODYNA, rotor has been meshed and its unsteadiness due to flow field time scale is considered. Instead of direct using of performances maps, source terms are added in Euler equation set to simulate the rotor. By comparing 1D modelling with 3D CFD results, It shows that rotor unsteadiness is indispensable for a better prediction. In addition, different variables response to pulse differently. In the rotor, mass flow is close to quasi-steady while entropy is significantly unsteady. TURBODYNA can capture these features correctly and provide an accurate prediction on pressure wave transportation.

Study of unsteady performance of a twin-entry mixed flow turbine

2016 ◽  
Vol 57 (2) ◽  
pp. 300-307
Author(s):  
M. M. Bencherif ◽  
M. K. Hamidou ◽  
M. Hamel ◽  
M. Abidat
Keyword(s):  
Mixed Flow ◽  
Unsteady Performance

Unsteady performance of a mixed-flow turbine with nozzled twin-entry volute confronted by pulsating incoming flow

2019 ◽  
Vol 95 ◽  
pp. 105485 ◽  
Author(s):  
Yingxian Xue ◽  
Mingyang Yang ◽  
Ricardo F. Martinez-Botas ◽  
Bijie Yang ◽  
Kangyao Deng
Keyword(s):  
Incoming Flow ◽  
Mixed Flow ◽  
Unsteady Performance

Mixed-flow turbines for automotive turbochargers: Steady and unsteady performance

2002 ◽  
Vol 3 (3) ◽  
pp. 127-138 ◽  
Author(s):  
N Karamanis ◽  
R. F. Martinez-Botas
Keyword(s):  
Velocity Ratio ◽  
Effective Means ◽  
Flow Characteristics ◽  
Cost Effective ◽  
Mixed Flow ◽  
Unsteady Performance ◽  
Radial Inflow Turbine ◽  
Inlet Angle ◽  
Turbine Design ◽  
Radial Turbines

Turbochargers are finding increasing application to automotive diesel engines as cost effective means for improving their power output and efficiency, and reducing exhaust emissions; these requirements have led to the need for highly loaded turbocharger turbines. A mixed-flow turbine is capable of achieving its peak isen-tropic efficiency at reduced velocity ratios compared to a typical radial inflow turbine; it is therefore possible to improve the turbocharger/engine matching. These turbines differ from the commonly used radial turbines in that the flow approaches the rotor in the non-radial direction; in the extreme a mixed-flow turbine would become an axial machine. The steady and unsteady performances of a mixed-flow turbocharger turbine with a constant blade inlet angle have been investigated. The steady flow results indicated that the mixed-flow turbine obtains a peak efficiency (total-to-static) of 75 per cent at a velocity ratio of 0.61, compared with that of a typical radial-inflow turbine which peaks at a velocity ratio of 0.7. The performance and flow characteristics were found to deviate significantly from the equivalent steady state values commonly used in turbocharger turbine design.

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