Performance of radial–axial clearance rim seal in realistic working conditions

Jia, Xingyun; Zhang, Hai; Jiang, Yuting

doi:10.1016/j.ast.2018.03.024

Cited by 16 publications

(6 citation statements)

References 13 publications

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“…The procedure of the detailed numerical method for heat and mass transfer is described well in [43][44][45][46][47][48]. Specifically in the area of the rotor-stator system, the numerical procedure of [49,50] can be considered as a guideline.…”

Section: Numerical Proceduresmentioning

confidence: 99%

Energy Harvesting by a Novel Substitution for Expansion Valves: Special Focus on City Gate Stations of High-Pressure Natural Gas Pipelines

2020

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A countless amount of energy has been wasted in all kinds of expansion valves (EV) in industries. In fact, EVs, including regulators, throttling valves, capillary tubes, etc., have been used to intentionally reduce the potential of carrier fluid. City gate stations (CGS) have been recognized as one of the important points with high potential for energy harvesting due to its function for regulating natural gas (NG) pressure by EV. In this study, Tesla turbine (TT) is introduced as a new candidate for substitution of EV, particularly those that have been employed in CGS on high-pressure NG pipelines, as well as those applications in which high-potential fluid must be reduced to a low-potential state to form a complete thermodynamic cycle or to be used at end-user equipment. Although harvesting energy is one of the hottest fields of science and engineering, there are few traces of research on using a TT as an alternative for EVs, even for the industries possessing high-pressure lines. This numerical experiment intends to show the capability of TT as a robust candidate for substituting regulation valves through investigating thermohydrodynamic characteristics of the turbulent high-pressure compressible NG flow through a TT under different operation conditions. This study, with the objective of managing the exploitation of resources, can be considered as one step forward toward reinforcing economic and environmental pillars of sustainable development. It is also found that the generated power by TT can support the 285 7W LED simultaneously, or it is equivalent to 84.4 m2 area of the solar panel (150 W, 15.42% efficiency) for the climate condition of Toronto, Canada.

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Section: Numerical Proceduresmentioning

confidence: 99%

Energy Harvesting by a Novel Substitution for Expansion Valves: Special Focus on City Gate Stations of High-Pressure Natural Gas Pipelines

2020

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“…To reduce the hot turbine main flow ingestion, the rim seal is arranged and the rim seal purge flow is adopted to cool the disc cavity. Owing to the high pressure of the rim seal purge flow, it ejects into the main flow passage and has impact on the main flow, inducing flow loss (Schobeiri et al 2015;Jia et al 2018, Zhu et al 2014.…”

Section: Introductionmentioning

confidence: 99%

Unsteady Numerical Investigation on Vortex Interaction between Rim Seal Purge Flow and Upstream Stator

Wang

Fan

et al. 2022

JAFM

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To assess unsteady vortex interaction between rim seal purge flow and upstream stator, numerical investigations were conducted under different purge flow rates. The vortex distributions for the stator and cavity were investigated and the interaction processes near the cavity exit, in particular the vorticity change resulting from the ingress and egress, were analyzed. Results show the intensity of hub passage vortex (HPV) and hub trailing shedding vortex (HTSV) at stator exit is decreased as a consequence of enhancing blockage effects caused by the egress flow. However, when the purge flow rate increases, from stator exit to downstream of cavity exit, the reduction in the intensity of two vortices is weakened as the extrusion of egress flow thins their vortex tubes. The vortex inside the cavity is generated as the combined effect of relative rotation of cavity walls and nonuniform circumferential pressure mainly imposed by upstream stator. The ingress leads the positive axial vorticity near the stator hub to ingest into the cavity and eject into the main passage due to the blockage of purge flow. Furthermore, the interaction between the ingress of the mainstream and purge flow produces local negative axial vorticity. The egress flow carries negative axial vorticity mainly originated from the rotational cavity wall, and enters into the main flow passage near the rotating hub, then locations of HPV and HTSV move to the mid-span slightly with the extrusion of egress flow.

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“…Lalwani et al 6 investigated the hot gas ingress in the turbine with single and double radial-clearance seals. Jia et al 7 pointed out that the radial-axial rim seal had a higher air-cooled aerodynamic efficiency which reduced the mainstream loss more than other types of rim seal. Sushanlal and Anish 8 analyzed the interaction effects between cylinder vortex and purge vortex.…”

Section: Introductionmentioning

confidence: 99%

Flow structures and heat transfer characteristics in a vaneless counter-rotating turbine cavity with different cooling inflows

Sui

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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The cooling air is used in the gas turbine to prevent the hot gas ingress and overheating of turbine disks. In this paper, the flow structures and heat transfer characteristics of vaneless counter-rotating turbine (VCRT) with different types of cooling inflows are numerically analyzed. The three-dimensional unsteady Reynolds-Averaged Navier-Stokes (URANS) equations with a Shear Stress Transport (SST) turbulence model are adopted. The results reveal that the inertia force, rotating effect and mainstream dominate the flow fields in VCRT cavity. The axial cooling inflow promotes the heat transfer characteristic in low pressure rotor (LPR) disk meanwhile the radial cooling inflow improves the heat transfer performance in high pressure rotor (HPR) disk. The vortexes interaction, viscous dissipation and heat transportation result in the decrease of heat transfer characteristic in the high radius region of rotor disk. The combined cooling inflow is adopted to solve the problem. It is the combination of radial cooling inlet and high position cooling inlet. The cooling air injected axially from the high position cooling inlet moves outward along the HPR disk which enhances the heat transfer characteristic. It is found that the Nusselt number and the amount of cooling air is not the simple linear relationship. The Nusselt number in HPR disk no longer increases if the high position cooling flow rate exceeds the threshold value. Compared with other types of cooling inflows, the needed amount of cooling air reduces when the combined cooling inflow is adopted. There is an optimum combined cooling flow rate which obtains the excellent heat transfer characteristics in the HPR disk.

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Performance of radial–axial clearance rim seal in realistic working conditions

Cited by 16 publications

References 13 publications

Energy Harvesting by a Novel Substitution for Expansion Valves: Special Focus on City Gate Stations of High-Pressure Natural Gas Pipelines

Energy Harvesting by a Novel Substitution for Expansion Valves: Special Focus on City Gate Stations of High-Pressure Natural Gas Pipelines

Unsteady Numerical Investigation on Vortex Interaction between Rim Seal Purge Flow and Upstream Stator

Flow structures and heat transfer characteristics in a vaneless counter-rotating turbine cavity with different cooling inflows

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