A set of correlations proposed for diffuser performance prediction

Pittaluga, Ferruccio

doi:10.1016/0093-6413(81)90005-7

Cited by 2 publications

(2 citation statements)

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“…A method based on the logarithmic mean temperature difference (LMTD) is not considered in this study due to its dependence on correction factors for flow arrangements other than parallel-and counterflow similar to the ε-NTU method. intake model [5] diffuser model [6,7] RHEX model [4] nozzle model [8] H int , D int…”

Section: Heat Exchangermentioning

confidence: 99%

“…Its height H int is sized for prescribed ambient conditions (T 8 , p 8 , V 8 ) and a given width Y to capture the desired airflow 9 m air , inducing a certain drag D int . The adjacent rectangular diffuser [6] determines for a desired area ratio AR the permitted height H RHEX and the allowable pressure drop ∆p air,max across the RHEX. Its length L diff is sized for maximum pressure recovery [7].…”

Section: Ram Air Ductmentioning

confidence: 99%

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Physically based heat exchanger sizing method for the thermal management system of all-electric regional aircraft

Nozinski,

Benam,

Servi

et al. 2024

J. Phys.: Conf. Ser.

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Fully electric propulsion systems integrating hydrogen-powered fuel cells and batteries are promising options to reduce the overall climate impact of regional aircraft. However, the increase in low-temperature heat sources aboard the aircraft calls for advanced thermal management system solutions. To address this challenge, this study presents a sizing methodology for ram air heat exchangers in the nacelle-integrated cooling loop of an all-electric regional aircraft based on the ATR-72 platform. Different discretization schemes are compared to identify an optimal sizing method. The results highlight the simplicity and efficiency of the 0D ε-NTU model. Geometric design variables are optimized with respect to drag and mass during a hot-day take-off. The resulting Pareto front reveals a tendency for low airflow outlet temperatures and large diffuser area ratios to result in lightweight designs but in turn, induce high drag and require a large installation space. Comparative analyses of specific optimal ram air duct designs and equivalent skin heat exchangers demonstrate the potential of a second heat sink over a flight mission. The limited heat transfer area of the skin heat exchanger proves insufficient for hot-day take-off and climb but offers advantages during cruise and descent thanks to the reduced drag.

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Section: Heat Exchangermentioning

confidence: 99%

Section: Ram Air Ductmentioning

confidence: 99%

Physically based heat exchanger sizing method for the thermal management system of all-electric regional aircraft

Nozinski,

Benam,

Servi

et al. 2024

J. Phys.: Conf. Ser.

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Design and Optimization of Ram Air–Based Thermal Management Systems for Hybrid-Electric Aircraft

et al. 2020

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Ram air–based thermal management systems (TMS) are investigated herein for the cooling of future hybrid-electric aircraft. The developed TMS model consists of all components required to estimate the impacts of mass, drag, and fuel burn on the aircraft, including heat exchangers, coldplates, ducts, pumps, and fans. To gain a better understanding of the TMS, one- and multi-dimensional system sensitivity analyses were conducted. The observations were used to aid with the numerical optimization of a ram air–based TMS towards the minimum fuel burn of a 180-passenger short-range partial-turboelectric aircraft with a power split of up to 30% electric power. The TMS was designed for the conditions at the top of the climb. For an aircraft with the maximum power split, the additional fuel burn caused by the TMS is 0.19%. Conditions occurring at a hot-day takeoff represent the most challenging off-design conditions for TMS. Steady-state cooling of all electric components with the designed TMS is possible during a hot-day takeoff if a small puller fan is utilized. Omitting the puller fan and instead oversizing the TMS is an alternative, but the fuel burn increase on aircraft level grows to 0.29%.

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A set of correlations proposed for diffuser performance prediction

Cited by 2 publications

References 0 publications

Physically based heat exchanger sizing method for the thermal management system of all-electric regional aircraft

Physically based heat exchanger sizing method for the thermal management system of all-electric regional aircraft

Design and Optimization of Ram Air–Based Thermal Management Systems for Hybrid-Electric Aircraft

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