Overall cooling effectiveness of effusion cooled annular combustor liner at reacting flow conditions

Ji, Yongbin; Ge, Bing; Chi, Zhongran; Zang, Shusheng

doi:10.1016/j.applthermaleng.2017.11.074

Cited by 17 publications

(2 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because the mainstream air temperature of such trials was lower, and the influence of radiation at lower temperatures was not apparent, more desired cooling results are frequently obtained (Behrendt and Hassa, 2008). In the operational environment of a real combustion engine, however, the temperature and flow fields in the combustion chamber fluctuated with the flame morphology, affecting the temperature distribution on the wall (Ji et al, 2018;Ahmed et al, 2022). Furthermore, because the incoming flow temperature was higher in the reactive state than that in non-reactive state, the effect of radiation was enhanced.…”

Section: Introductionmentioning

confidence: 99%

Influence of blowing ratio on double-wall cooling characteristics under the condition of high-temperature flue gas

Yi,

Xiong,

Liu

et al. 2024

J. Glob. Power Propuls. Soc.

View full text Add to dashboard Cite

Double-wall cooling has been extensively investigated due to its exceptional cooling performance. However, most previous studies on the cooling characteristics of double-wall geometry have been conducted under non-reacting conditions, neglecting the influence of high-temperature flue gas radiation. In this paper, an experiment investigation was carried out to evaluate the impact of blowing ratio <italic>M</italic> and coolant-to-gas temperature ratio on the cooling characteristics of effusion/impingement cooling at reacting flow conditions. The experiments were performed at atmospheric pressure with flame temperatures of 1,800 and 1,900 K respectively. Flue gas temperature was measured by S-type thermocouples, while an infrared camera and N-type thermocouples were employed for the gas-side wall surface temperature distribution measurements. The results demonstrate that the laterally averaged cooling effectiveness of the effusion/impingement cooling system increases with the increase of <italic>M</italic>. However, beyond a blowing ratio of 5.1, further increments in <italic>M</italic> do not significantly affect the cooling effectiveness. Moreover, it is observed that the laterally averaged cooling effectiveness gradually improves along the flow direction but at a reduced rate. Additionally, no significant changes in cooling effectiveness are observed after <italic>X</italic>/<italic>D</italic> > 50. Furthermore, when considering a blowing ratio of 4, higher coolant temperatures result in higher cooling effectiveness compared to lower coolant temperatures.

show abstract

Section: Introductionmentioning

confidence: 99%

Influence of blowing ratio on double-wall cooling characteristics under the condition of high-temperature flue gas

Yi,

Xiong,

Liu

et al. 2024

J. Glob. Power Propuls. Soc.

View full text Add to dashboard Cite

show abstract

“…A further step towards realistic engine conditions repro-duction was added by Shanghai Jiao-Tong University research group [9,10], which performed experiments involving reacting processes in order to take account of the flame pattern and combustion heat release. A scaled three sector annular combustor with effusion cooling plates equipped on both outer and inner liners was employed to perform an IR thermography for wall temperature field measurement.…”

Section: Introductionmentioning

confidence: 99%

A New Test Facility for Investigating Thermal Behaviour of Effusion Cooling Test Plates for RQL Combustors

Picchi

Andreini

Becchi

et al. 2020

Volume 7A: Heat Transfer

View full text Add to dashboard Cite

In aero engines the combustors are subjected to critical thermal conditions in terms of high temperatures and corrosive environment, which could affect the service life of the entire system. As well known, Thermal Barrier Coatings (TBC) and above all cooling systems represents the state-of-the-art in the nowadays protecting methods: the maximization of this beneficial effect is achieved by defining an optimal cooling arrangement and developing suitable manufacturing technologies for these systems. In modern aero-engine combustors, one of the most effective cooling scheme for liners is composed by an effusion perforation coupled with a slot system to start the film cooling. The cooling performances are deeply influenced by the mutual interactions between swirling and cooling flows. In addition, for typical Rich-Quench-Lean (RQL) combustor architectures, the injection of air provided to promoting the local break-down of the flame mixture fraction, deeply interacts with the swirled flow, generating recirculating structures capable of affecting the development of film cooling and making the design of cooling systems very challenging. A new test facility for testing effusion test plates for RQL combustors applications has been developed with the final aim of comparing different cooling strategies and at the same time to collect data for numerical model validation. The experimental set-up consists of a non-reactive planar sector rigs with 5 engine-scale swirlers fed with air up to 250 °C and 3 bar. The rig was equipped with outer/inner dilution ports, and a simple inner liner cooling scheme composed of effusion and a slot system: all these features, fed with air at ambient temperature, can be independently controlled in terms of mass flow. Using dedicated optical accesses, InfraRed (IR) camera tests were performed to retrieve overall effectiveness data imposing a temperature difference between swirling and cooling flows. To better understand those results, Pressure Sensitive Paint (PSP) technique was used to obtain reliable film effectiveness data decoupling the contribution of slot and effusion flows. The thermal characterization was supported by Particle Image Velocimetry (PIV) investigations on the median plane. Tests were performed at different pressure drops across swirler and varying the mass flows of slot and inner/outer liners. The analysis of the data highlighted the influences of the swirling flow on the overall thermal performance and the behaviour of the film cooling system.

show abstract

New design of a hot mixing chamber for lowering its surface temperature by adopting a perforated inner cylinder

et al. 2021

View full text Add to dashboard Cite

Overall cooling effectiveness of effusion cooled annular combustor liner at reacting flow conditions

Cited by 17 publications

References 28 publications

Influence of blowing ratio on double-wall cooling characteristics under the condition of high-temperature flue gas

Influence of blowing ratio on double-wall cooling characteristics under the condition of high-temperature flue gas

A New Test Facility for Investigating Thermal Behaviour of Effusion Cooling Test Plates for RQL Combustors

New design of a hot mixing chamber for lowering its surface temperature by adopting a perforated inner cylinder

Contact Info

Product

Resources

About