A Generic Low Pressure Exhaust Diffuser for Steam Turbine Research

Burton, Zoe; Hogg, Simon; Ingram, Grant

doi:10.1115/gt2012-68485

Cited by 9 publications

(26 citation statements)

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“…al. [8] and the CFD calculation procedure are found in a School Technical Report https://www.dur.ac.uk/ ecs/ecs_research/technical_reports/.…”

Section: Lp Exhaust Diffuser Test Casementioning

confidence: 99%

“…The stator mesh generated from the work of Burton 2012 [8] was carried over for this work, Figure 2. The original grid was generated in AN-SYS ICEM-CFD grid generation software.…”

Section: Mesh Generationmentioning

confidence: 99%

“…For this study, the generic last stage blade geometries from the work of Burton in 2012 [8] were modified to include the rotor tip gap. This was set at 4.2mm (approximately 0.5% …”

Section: Stage Calculationsmentioning

confidence: 99%

“…This paper describes the addition of the rotor tip leakage jet to the public domain LP exhaust diffuser test case proposed by Burton in 2012 [8] but the key advance is to explore how the variation in exhaust hood outlet static pressure due to the flow of the condenser cooling water impacts the pressure recovery and flow structure in the exhaust hood.…”

Section: Introductionmentioning

confidence: 99%

“…This method was first used in the mid-1990's with uniform flow properties at inlet [1,7] but was shown to produce inaccurate flow structures. Ensuring the accuracy of the inlet boundary condition by incorporating radial variations of flow properties enables representative flow structures to be generated in modern flow calculations [8].…”

Section: Introductionmentioning

confidence: 99%

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The influence of condenser pressure variation and tip leakage on low pressure steam turbine exhaust hood flows

Burton

Ingram

Hogg

2014

Proceedings of the Institution of Mechanical Engineers, Part A:

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. This paper aims to highlight the importance of the accurate computational modelling of both the inlet and outlet exhaust hood boundary conditions. The computations presented are calculated using the public domain LP exhaust diffuser test case proposed by Burton in 2012. The original test case did not include the effect of tip leakage on diffuser flows, this paper describes the inclusion of tip leakage and the results are shown to be in-line with the outputs produced by other authors. The key advance in this paper is that calculations were conducted with a representative condenser pressure gradient caused by the temperature variation inside the condenser tube nest. It is shown that accurately modelling the exit boundary calculation has a large influence on the flow structure and a smaller influence on the pressure recovery inside the exhaust diffuser. This influence is smaller than that seen by other authors when including unsteady effects or accounting for the circumferential non-uniformity of the turbine exit flow but will need to be included in design calculations as diffuser design advances. Nomenclature C p = P 2 −P 1 P T 1 −P 1 Static Pressure Recovery c p

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“…al. [8] and the CFD calculation procedure are found in a School Technical Report https://www.dur.ac.uk/ ecs/ecs_research/technical_reports/.…”

Section: Lp Exhaust Diffuser Test Casementioning

confidence: 99%

“…The stator mesh generated from the work of Burton 2012 [8] was carried over for this work, Figure 2. The original grid was generated in AN-SYS ICEM-CFD grid generation software.…”

Section: Mesh Generationmentioning

confidence: 99%

“…For this study, the generic last stage blade geometries from the work of Burton in 2012 [8] were modified to include the rotor tip gap. This was set at 4.2mm (approximately 0.5% …”

Section: Stage Calculationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The influence of condenser pressure variation and tip leakage on low pressure steam turbine exhaust hood flows

Burton

Ingram

Hogg

2014

Proceedings of the Institution of Mechanical Engineers, Part A:

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Optimization of Gas Turbine Exhaust Volute Flow Loss

Wang

Zhang²,

Hao³

et al. 2022

J. Marine. Sci. Appl.

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A Literature Review of Low Pressure Steam Turbine Exhaust Hood and Diffuser Studies

Burton¹,

Ingram²,

Hogg

2013

Journal of Engineering for Gas Turbines and Power

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This paper summarizes the findings from research studies carried out over the last 30 years, to better understand the flows in steam turbine low pressure exhaust hoods and diffusers. The work aims to highlight the areas where further study is still required. A detailed description of the flow structure is outlined and the influence of the last turbine stage and the hood geometry on loss coefficient is explored. At present, the key challenge faced is numerically modeling the three-dimensional, unsteady, transonic, wet steam exhaust hood flow given the impractically high computational power requirement. Multiple calculation simplifications to reduce the computational demand have been successfully verified with experimental data, but at present there is no 'best-practice' approach to reduce the computational time for routine design exercises. This paper highlights the importance of coupling the exhaust hood to the last stage steam turbine blades to capture the interaction; ensuring the total pressure and swirl angle profiles, along with the tip leakage jet are accurately applied to the diffuser inlet. The nonaxial symmetry of the exhaust hood means it is also important to model the full blade annulus. More studies have emerged modeling the wet steam and unsteady flow effects, but more work is required in this area to fully understand the impact on the flow structure.

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A Generic Low Pressure Exhaust Diffuser for Steam Turbine Research

Cited by 9 publications

References 0 publications

The influence of condenser pressure variation and tip leakage on low pressure steam turbine exhaust hood flows

The influence of condenser pressure variation and tip leakage on low pressure steam turbine exhaust hood flows

Optimization of Gas Turbine Exhaust Volute Flow Loss

A Literature Review of Low Pressure Steam Turbine Exhaust Hood and Diffuser Studies

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