The Experimental Studies of Improving the Aerodynamic Performance of a Turbine Exhaust System

Guillot, Stephen; Ng, Wing F.; Hamm, Hans D.; Stang, Ulrich E.; Lowe, K. Todd

doi:10.1115/1.4028020

Cited by 11 publications

(3 citation statements)

References 17 publications

(21 reference statements)

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“…The validation of the newly-designed diffuser in the test engine has shown that the described design process leads to a noticeable performance improvement and provides quite reliable results. Guillot et al's 42 experimental studies indicated that the design modifications result in a substantial increase in the overall pressure recovery coefficient of 0.07 above the baseline. Furthermore, the numerical investigation of the impact of flow deflection at the upper volute by Munyoki et al 43 showed that, deflector configurations investigated are found to re-direct the flow at the upper volute and to minimize the intensity of the swirling flows hence leading to aerodynamic performance improvement of exhaust volutes.…”

Section: Design Optimization Of Exhaust Volutes Towards Improving the Turbine-volute Performancementioning

confidence: 99%

Advances in coupled axial turbine and nonaxisymmetric exhaust volute aerodynamics for turbomachinery

Gao

Tao

Huo

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part G:

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Marine, industrial, turboprop and turboshaft gas turbine engines use nonaxisymmetric exhaust volutes for flow diffusion and pressure recovery. These processes result in a three-dimensional complex turbulent flow in the exhaust volute. The flows in the axial turbine and nonaxisymmetric exhaust volute are closely coupled and inherently unsteady, and they have a great influence on the turbine and exhaust aerodynamic characteristics. Therefore, it is very necessary to carry out research on coupled axial turbine and nonaxisymmetric exhaust volute aerodynamics, so as to provide reference for the high-efficiency turbine-volute designs. This paper summarizes and analyzes the recent advances in the field of coupled axial turbine and nonaxisymmetric exhaust volute aerodynamics for turbomachinery. This review covers the following topics that are important for turbine and volute coupled designs: (1) flow and loss characteristics of nonaxisymmetric exhaust volutes, (2) flow interactions between axial turbine and nonaxisymmetric exhaust volute, (3) improvement of turbine and volute performance within spatial limitations and (4) research methods of coupled turbine and exhaust volute aerodynamics. The emphasis is placed on the turbine-volute interactions and performance improvement. We also present our own insights regarding the current research trends and the prospects for future developments.

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Section: Design Optimization Of Exhaust Volutes Towards Improving the Turbine-volute Performancementioning

confidence: 99%

Advances in coupled axial turbine and nonaxisymmetric exhaust volute aerodynamics for turbomachinery

Gao

Tao

Huo

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…Schaefer et al 28 developed the multi-objective aerodynamic optimization of the duct and struts for maximization of the static pressure recovery performance of the exhaust diffuser at two inlet flow conditions. Guillot et al, 29 Xue et al 30 and Siorek et al 31 systematically investigated the flow field and aerodynamic performance of the diffuser-collector exhaust system for industrial gas turbines by experimental measurements and numerical simulations. The redesigned diffuser profile resulted in a substantial increase in the overall pressure recovery coefficient compared with the baseline geometry.…”

Section: Introductionmentioning

confidence: 99%

Effects of struts profiles and skewed angles on the aerodynamic performance of gas turbine exhaust diffuser

Dong

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part A:

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The strut structure directly affects the flow field characteristics and aerodynamic performance of the gas turbine exhaust diffuser. The effects of the strut profiles and strut skewed angles on the aerodynamic performance of the exhaust diffuser at different inlet pre-swirls were numerically investigated using three-dimensional Reynolds-Averaged Navier-Stokes(RANS) and Realizable k-ε turbulence model. The numerical static pressure recovery coefficient of the exhaust diffuser is in agreement with the experimental data well. The reliability of the numerical method for the exhaust diffuser performance analysis was demonstrated. Exhaust diffusers with four kinds of vertical strut profiles obtain the highest static pressure recovery coefficient at the inlet pre-swirl of 0.35. The similar static pressure recovery coefficient of exhaust diffusers with four kinds of vertical strut airfoils are observed when the inlet pre-swirl is less than 0.48. The static pressure recovery coefficient of exhaust diffusers with vertical b1 and b2 struts are higher than that with the a1 and a2 struts when the inlet pre-swirl is greater than 0.48. At the inlet pre-swirl of 0.35, The static pressure recovery coefficient of the exhaust diffuser with the a1 strut decreases with the increasing of the strut skewed angles. The static pressure recovery coefficient of the exhaust diffuser with the b1 strut increases with the increasing of the strut skewed angles, and the static pressure recovery coefficient increases by 3.6% compared with the vertical design when the skewed angle of b1 strut is 40[Formula: see text]. At the inlet pre-swirl of 0.64. The static pressure recovery coefficient of the exhaust diffuser with the a1 strut increases by 8.7% compared with the vertical design when the skewed angle of a1 strut is greater than 20°. In addition, the static pressure recovery coefficient of the exhaust diffuser with the b1 strut decreases by 3.8% compared with the vertical design when the skewed angle of b1 strut is 40°. The method to improve the aerodynamic performance of the exhaust diffuser by appropriate increase the strut maximum thickness and design the strut skewed angle is proposed in this work.

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“…Yang et al 16 presented an aerodynamically optimized design of exhaust volute diffuser for steam turbine combined with three-dimensional parameterization method of exhaust diffuser profile, aerodynamic performance evaluation method, response surface approximation evaluation model, and Hooke-Jeeves direct search approach. Guillot et al 17 conducted the analysis and multiscale testing to optimize the turbine exhaust system. It was observed that the flow features are qualitatively consistent across the scales, although some quantitative differences exist due to Reynolds number effects.…”

Section: Introductionmentioning

confidence: 99%

Reduction of aerodynamic forces on turbine blading by asymmetric layout of struts based on flow interaction between rotor-strut-volute

Gao

Meng

Jia

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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The flows in the power turbine and nonaxisymmetric exhaust volute with struts are closely coupled and inherently unsteady for marine gas turbines, and the flow interactions between them have a significant influence on the rotor and strut blade aerodynamic force characteristics; however, the asymmetric flow interactions have not been taken into account properly in current turbine design approaches. This paper is a continuation of the previous work and aims to clarify effects of different symmetrical and asymmetric layouts of struts on the flow interactions between power turbine and exhaust volute, in an attempt to seek an optimal layout of struts with the objective of making use of the mentioned asymmetric flow interactions to reduce the rotor and strut blade aerodynamic forces. This work was carried out using coupled unsteady simulations with the full annulus computational domain including 76 rotor blades, 9 strut blades, and an exhaust volute. Results show that the level of aerodynamic force at specific frequencies on the power turbine blade surface can be reduced by applying a proper distribution of asymmetric layout of struts; using the asymmetric strut design, although the reduction of the rotor blade aerodynamic force is weak, the strut blade aerodynamic force has been reduced significantly; the asymmetric layout of struts does not improve the overall flow characteristics of turbines very much. The present results indicate that it is possible to reduce vibration and increase blade fatigue life by asymmetric strut designs.

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The Experimental Studies of Improving the Aerodynamic Performance of a Turbine Exhaust System

Cited by 11 publications

References 17 publications

Advances in coupled axial turbine and nonaxisymmetric exhaust volute aerodynamics for turbomachinery

Advances in coupled axial turbine and nonaxisymmetric exhaust volute aerodynamics for turbomachinery

Effects of struts profiles and skewed angles on the aerodynamic performance of gas turbine exhaust diffuser

Reduction of aerodynamic forces on turbine blading by asymmetric layout of struts based on flow interaction between rotor-strut-volute

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