Swirl Flow and Heat Transfer in a Rotor-Stator Cavity with Consideration of the Inlet Seal Thermal Deformation Effect

Shi, Yu; Ding, Shuiting; Liu, Peng; Qiu, Tian; Qiu, Changbo; Ye, Dahai

doi:10.3390/aerospace10020134

Cited by 5 publications

(2 citation statements)

References 35 publications

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“…As the fuel vapor concentration in the fuel tank ullage is relatively low, the evaporation rate of the fuel components in this study . m ei can be estimated using the following equation [27]:…”

Section: Mass Transfer Modelmentioning

confidence: 99%

Study on RP-3 Aviation Fuel Vapor Concentration

et al. 2023

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Fuel vapor concentration is a key parameter for assessing the flammability of aircraft fuel tanks. However, the current research on RP-3 (Rocket Propellant-3) fuel vapor concentration is inadequate. This study categorizes fuel components by the number of carbon atoms and utilizes Raoult’s law to estimate the gas–liquid equilibrium relationship of each constituent element under equilibrium conditions. The equilibrium-state model is experimentally validated, and the differences in the constituents and fuel vapor concentrations of RP-3 and Jet-A (Jet Fuel-A) fuels are analyzed. In addition, an empirical correlation between the overall hydrocarbon concentration of RP-3 fuel vapor and the temperature and pressure in the equilibrium state is established, providing a theoretical basis for determining RP-3 fuel vapor concentration in related investigations. Furthermore, a transient prediction model of fuel vapor concentration is developed using the lumped parameter approach that considers the heat exchange among the fuel, gas, wall, and environment. The model’s accuracy is confirmed by comparing it to existing literature. Then, the temperature and fuel vapor concentration variation patterns in the fuel tank are calculated and evaluated under two typical flight scenarios. The results show a significant difference between the calculated fuel vapor concentration values obtained through equilibrium-state and transient models. Therefore, in the design of fuel vapor catalytic inerting systems, it is crucial to consider both the equilibrium and transient fuel vapor concentration values rather than relying solely on the former. Throughout the flight envelope, gas phase and fuel phase temperatures in RP-3, Jet-A, and C10H22 fuel tanks exhibit minimal differences. However, significant variations in fuel vapor concentration exist depending on the flight state and envelope. Hence, regarding RP-3 as equivalent to C10H22 is inappropriate. Additionally, fuel vapor concentration is a more suitable metric than fuel temperature for assessing fuel tank flammability.

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Section: Mass Transfer Modelmentioning

confidence: 99%

Study on RP-3 Aviation Fuel Vapor Concentration

et al. 2023

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“…To study flow and heat transfer, reference [12] numerically explored the effect of air friction heating on the rotor-stator micro-cavity at high speed, analyzing the influence of centrifugal force and spacing. Reference [13] analyzed the vortex flow and heat transfer properties of a rotor-stator cavity configuration. Reference [14] also numerically examined the heat transfer properties in the rotor-stator cavity using steady-state flow analysis.…”

mentioning

confidence: 99%

Analysis of Convective Heat Exchanges and Fluid Dynamics in the Air Gap of a Discoid Technology Rotary Machine

Hannaoui,

Boutarfa,

Haidar

2024

FHMT

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The proposed work focuses on the in-depth study of convective heat transfer in the unconfined air gap of a discoidal rotor-stator system. The rotary cooling mechanism is achieved by the injection of two air jets, while the cavity geometry is characterized by a dimensionless parameter G. The numerical analysis primarily concentrated on the effect of flow velocity and rotation on the heat exchange process. More precisely, the range of analysis extends from the rotational Reynolds number Re ω = 2.35 × 10 5 to Re ω = 5.04 × 10 5 , while varying the Reynolds value of the jet in a range from 16 × 10 3 to 55.46 × 10 3 . To carry out this analysis, a numerical simulation was conducted with Ansys-Fluent software, using the RSM turbulence model. The results of the study significantly reveal the impact of rotation on heat exchange transfer within the cavity, identifying two distinct zones of fluid recirculation. These zones exhibit remarkable heat transfer characteristics, contributing to a better understanding of the complex mechanisms governing heat transfer in this particular technological context. Additionally, the analysis of radial mean velocity distributions, as well as local and mean Nusselt numbers, provides further insight into the heat transfer performance of this unique configuration.

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