Study of the Dump Diffuser Optimization for Gas Turbine Combustors

Xu, Leilei; Huang, Yue; Ruan, Can; Xing, Peiyong Wangand Fei

doi:10.1016/j.proeng.2014.12.608

Cited by 10 publications

(6 citation statements)

References 8 publications

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“…At lower magnitudes of PDA such as 12°, 18°, from Klein (1995), it is clear that losses at 18° are higher than those at 12°. The results of Xu et al (2015) also show evidential flow separation on the prediffuser wall, for a diffuser with 18° included PDA. Klein et al (1974) has proposed that total pressure loss associated is lower and almost constant, for PDA of magnitudes within 12.5°.…”

Section: Computational Domainmentioning

confidence: 70%

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Effect of Side Wall Expansion Angle on the Performance of a Dump Diffuser Model for a Combustor

Chetan

Chakrabarti

2019

JAFM

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In the present article, numerical analysis has been performed on a dump diffuser model, to study the effect of sidewall expansion angle (SWA), on its performance aspects. SWA has been varied from 90° to 1° and performance has been evaluated in terms of major influencing aspects. It is observed that, at SWA of magnitudes greater than 11°, there is no significant change in the performance. But at SWA below 11°, significant changes, which enhance the performance are observed. It is noticed that at SWA in range, from 3.57° to 8°, higher static pressure recovery (almost from 25 to 33% of inlet dynamic pressure) happens in the dump and annular regions. SWA of magnitudes less than 11° have resulted in smaller, low dense and higher intense recirculation zones. At the SWA of 3.57°, static pressure recovered is maximum and total pressure lost is minimum. But that SWA causes too much delay in pressure stabilization on the liner wall. However, SWA of magnitudes less than 3.57° have resulted in comparatively poor performance. Eventually, sidewall angle in the range from 5° to 7° is found to be optimum as it yields higher static pressure recovery and low total pressure loss. This range also results in early stabilization of pressure both on the liner and casing walls.

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Section: Computational Domainmentioning

confidence: 70%

“…They have observed that total pressure loss increases proportionally with annular area ratio. Xu et al (2015) have performed studies on a model dump diffuser, both numerically and experimentally. They have compared the results obtained by using different turbulence closure models with experimental results.…”

Section: Fig 1 Diffuser Types Faired Diffuser (B) Dumpmentioning

confidence: 99%

Effect of Side Wall Expansion Angle on the Performance of a Dump Diffuser Model for a Combustor

Chetan

Chakrabarti

2019

JAFM

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“…Baseline values (H 1 = 21 7 mm, L pre = 57 mm, W = 98 mm, H 3 = H 4 = 20 5 mm, θ = 9°, and D/H 2 = 1 02) are based on a typical diffuser. Flow velocity is set to 0.25 m/s [23].…”

Section: International Journal Of Aerospace Engineeringmentioning

confidence: 99%

Optimization Study of the Dump Diffuser in Gas Turbine to Reduce Pressure Loss

Xing

Chan

et al. 2018

International Journal of Aerospace Engineering

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As a key component-connecting compressor and the entrance of combustion chamber, the diffuser is able to increase the pressure and slow down the airflow in order to promote efficient combustion as well as avoid a large amount of pressure loss. In this paper, experimental investigation and numerical studies have been carried out to understand the effects of air bleeding from dump region and dump gap ratio on the total pressure loss and static pressure recovery of the dump diffusers. The ultimate objective is optimizing the dump diffuser design to get the maximum static pressure recovery and minimum total pressure loss. A simplified test model is used to study the effect of the air bleeding from the outer dump region and the dump gap ratio on the total pressure loss and static pressure recovery in the dump diffuser. The impact of the dump gap ratio in the performance of the dump diffusers has also been discussed. Nearly all the pressure raise occurs in the prediffuser, and most of the total pressure loss occurs in the dump region. For the recirculating area in the dump region, the controllable vortex can be introduced. Bleeding air from the outer dump region can improve the velocity distribution near the flame tube. The results show that when 0.4% of the air is bled from outer dump region, the performance of the dump diffuser is optimal. Hence, the controllable vortex method is effective for improving the performance of the dump diffuser.

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“…Firstly, Xu et al investigated the design and optimization of advanced aero engine gas turbines and developed the vortex generators that are useful for improving diffuser performance. 1 Earlier, Shyy investigated the numerical simulation characteristics for multichannel flow arrangement using various numerical methods and their relationship with grid distribution to arrive at the following conclusions. 2 The presence of the multichannel configuration and the downstream boundary conditions are the two significant factors that have been investigated.…”

Section: Introductionmentioning

confidence: 99%

Exhaust condensation through porous bed in the primary zone of novel dump diffuser geometry

Prawin

Rose

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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The work presented in this article deals with the reduction of air pollution generated by automobiles. It is accomplished through the process of condensation using novel techniques such as utilization of porous metal foams. A modified geometry dump diffuser is used to facilitate flow of exhaust gases slowly around copper coils thereby condensing them. The condensed gases can be collected and stored in a chamber and then can be carried to industries for recycling. This article involves design of the modified geometry dump diffuser using CATIA V5 tool. The computational fluid dynamics (CFD) analysis of the model is carried out using the ANSYS Fluent software. The inlet parameters are obtained as per the exhaust characteristics of a typical 0.8 l 3-cylinder Gasoline Engine. The results are presented for modified geometry dump diffuser models with and without porous bed. Porous bed module is used to simulate the presence of metal foams in the primary zone and inside the inner fluid zone. The results are presented. The results show that the modified geometry dump diffuser model with porous bed can cool the exhaust gases to their condensation temperature. This model can be employed in automobiles to reduce air pollution.

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Study of the Dump Diffuser Optimization for Gas Turbine Combustors

Cited by 10 publications

References 8 publications

Effect of Side Wall Expansion Angle on the Performance of a Dump Diffuser Model for a Combustor

Effect of Side Wall Expansion Angle on the Performance of a Dump Diffuser Model for a Combustor

Optimization Study of the Dump Diffuser in Gas Turbine to Reduce Pressure Loss

Exhaust condensation through porous bed in the primary zone of novel dump diffuser geometry

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