A parametric study of squealer tip geometries applied in a hydraulic axial turbine used in a rocket engine turbopump

Tonon, Daniel da Silva; Tomita, Jesuíno Takachi; Garcia, Ézio Castejon; Bringhenti, Cleverson; Almeida, Luís Eduardo

doi:10.1016/j.ast.2022.107426

Cited by 9 publications

(2 citation statements)

References 42 publications

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“…The tip clearance has a strong influence on the performance of turbomachines. Large tip clearances cause a loss of turbomachine performance and a reduction in its operational range [1]- [4]. In this region, the flow that leaks between the blade tip and the casing from the blade pressure side to the suction side, known as tip leakage flow, does not participate in the energy generation process, thus being a source of losses in the compressor flow [5], [6].…”

Section: Smmentioning

confidence: 99%

An Evaluation of Passive Wall Treatment With Circumferential Grooves at the Casing of the First and Second Blade Rotor Rows of a High-performance Multi-stage Axial Compressor

Diaz,

Tomita,

Bringhenti

et al. 2023

Preprint

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The internal losses in the tip clearance region strongly influence the compressor performance and its operational range. Previous research proved that passive wall treatments with circumferential grooves in axial compressors effectively increase the compressor stall margin. The vortex generated inside the circumferential grooves create a resistance to the flow that leaks in the tip clearance region of the compressor. However, most works found in the literature on circumferential grooves in axial compressors deal only with high-performance single-stage axial compressors. Therefore, there is a need to investigate and analyze the behavior of circumferential grooves in a multi-stage environment. In the present work, a passive wall treatment with circumferential grooves was implemented in a multi-stage axial compressor. Different configurations of circumferential grooves were created at the casing of the first and second rotor rows used in a four-stage axial flow compressor. Numerical simulations were performed to evaluate the influence of the circumferential grooves on the performance of a multi-stage axial compressor. The results obtained after the simulations for the different circumferential groove configurations were compared with the results obtained for the compressor without casing treatment (smooth wall) for different rotational speeds. Furthermore, the complete compressor map characteristics were simulated for the different casing treatment configurations, and the results were compared with the compressor characteristics of the smooth wall case. The passive wall treatment with circumferential grooves produced changes in the multi-stage axial compressor flow field, especially in the tip clearance region, improving the compressor stability mainly for part load speeds.

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Section: Smmentioning

confidence: 99%

An Evaluation of Passive Wall Treatment With Circumferential Grooves at the Casing of the First and Second Blade Rotor Rows of a High-performance Multi-stage Axial Compressor

Diaz,

Tomita,

Bringhenti

et al. 2023

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…Replacing the traditional Joule-Thomson valve with hydraulic turbines can improve the energy and cost benefits of natural gas liquefaction. Compared with traditional SMR processes using Joule-Thomson valve valves, the recovered energy can increase the feed pressure of natural gas, save energy and improve efficiency [46][47][48][49]. The marine desulfurization tower is an emission reduction device widely used in ship transport.…”

Section: Effect Of Factors On the Efficiency Of Hydraulic Turbines 21...mentioning

confidence: 99%

A Review of the Efficiency Improvement of Hydraulic Turbines in Energy Recovery

Song

Xue

et al. 2023

Processes

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Turbine energy recovery is a process energy saving technology, and understanding turbine efficiency has important operational and economic benefits for the operator of a power plant. There are three main areas of research into turbine energy efficiency: the structural performance of the turbine itself, the configuration of the recovery device and the regulation of operating conditions. This paper summarizes recent research advances in hydraulic turbine energy efficiency improvement, focusing on the design factors that can affect the overall efficiency of a hydraulic turbine. To quantify the impact of these factors, this paper investigates the effects of surface roughness, flow rate, head and impeller speed on overall efficiency. Methods for optimizing improvements based on these design factors are reviewed, and two methods, the Box–Behnken Design method and the NSGA-II genetic algorithm, are described with practical examples to provide ideas for future research.

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Loss map for aeroengine turbine blade equipped with tip inlet squealer

Jeong,

Lee

2024

J Mech Sci Technol

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A parametric study of squealer tip geometries applied in a hydraulic axial turbine used in a rocket engine turbopump

Cited by 9 publications

References 42 publications

An Evaluation of Passive Wall Treatment With Circumferential Grooves at the Casing of the First and Second Blade Rotor Rows of a High-performance Multi-stage Axial Compressor

An Evaluation of Passive Wall Treatment With Circumferential Grooves at the Casing of the First and Second Blade Rotor Rows of a High-performance Multi-stage Axial Compressor

A Review of the Efficiency Improvement of Hydraulic Turbines in Energy Recovery

Loss map for aeroengine turbine blade equipped with tip inlet squealer

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