Thermo-and fluid mechanical analysis of high aspect ratio cooling channels

Woschnak, A.; Oschwald, Michael

doi:10.2514/6.2001-3404

Cited by 18 publications

(13 citation statements)

References 2 publications

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“…6b). This e¨ect is due to the limited mixing and thermal strati¦cation within the coolant that takes place in case of high aspect ratio and has been already noticed in [6,17]. In Fig.…”

Section: Resultsmentioning

confidence: 99%

Evolution of cooling-channel properties for varying aspect ratio

Pizzarelli

Nasuti

Onofri

2016

Progress in Propulsion Physics

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A trade-o¨analysis is performed on a cooling channel system representative of liquid rocket engine cooling systems. This analysis requires multiple cooling channel §ow calculations which are performed by means of a proper numerical approach, referred to as quasi-two-dimensional (2D) model. This model, which is suited to high-aspect-ratio cooling channels (HARCC), permits to have a fast prediction of both the coolant §ow evolution and the temperature distribution along the whole cooling channel structure. Before using the quasi-2D model for the trade-oä nalysis, its validation by comparison with computational §uid dynamics (CFD) results is presented and discussed. The results show that the pump power required to overcome losses in the cooling circuit can be minimized selecting a channel shaped with a suitably high aspect ratio.

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“…6b). This e¨ect is due to the limited mixing and thermal strati¦cation within the coolant that takes place in case of high aspect ratio and has been already noticed in [6,17]. In Fig.…”

Section: Resultsmentioning

confidence: 99%

Evolution of cooling-channel properties for varying aspect ratio

Pizzarelli

Nasuti

Onofri

2016

Progress in Propulsion Physics

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“…During the research made by Ref. [11], the necessity to introduce a novel quasi-2D approach for the coolant flow replacing the one-dimensional hydraulic analysis was emphasized. In fact, it was recognized that for HARCC it is necessary to take into account the great variation of the fluid temperature, and the resulting stratification of the thermal field within the cooling channel cross section, which occurs in case of strongly asymmetric distributed heat fluxes and cooling channel geometries with high aspect ratios.…”

Section: Introductionmentioning

confidence: 99%

“…10 Numerical and experimental studies were thus carried out aiming to find the best cooling channel configuration for assigned constraints. 4,11,12 In particular, the optimization strategy proposed by Ref. [11] has been numerically performed by means of a one-dimensional hydraulic approach for the coolant flow and three-dimensional heat conduction for the wall material.…”

Section: Introductionmentioning

confidence: 99%

“…4,11,12 In particular, the optimization strategy proposed by Ref. [11] has been numerically performed by means of a one-dimensional hydraulic approach for the coolant flow and three-dimensional heat conduction for the wall material. Once chosen the range of channel aspect ratio to be investigated, their number and cross section area has been selected considering the imposed constraints of: coolant pressure drop, mass flow rate, rib thickness and entering heat flux from the hot-gas.…”

Section: Introductionmentioning

confidence: 99%

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Quasi-2D Modeling of High-Aspect-Ratio-Cooling-Channel Flows

Pizzarelli

Nasuti

Oiioin

2013

49th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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A trade-off analysis is performed on a cooling channel system representative of liquid rocket engine cooling systems. This analysis requires multiple cooling channel flow calculations which are performed by means of a proper numerical approach, referred to as quasi-2D model. This model, which is suited to high-aspect-ratio cooling channels, permits to have a fast prediction of both the coolant flow evolution and the temperature distribution along the whole cooling channel structure. Before using the quasi-2D model for the trade-off analysis, its validation by comparison with CFD results is presented and discussed. Results show that the pump power required to overcome losses in the cooling circuit can be minimized selecting a channel shaped with a suitably high aspect ratio. Nomenclaturė m mass flow rate, kg s −1 A area of the channel cross section, m 2 b channel width, m D h channel hydraulic diameter, m f w skin friction factor G mass flow rate per unit area, kg m −2 s −1 h channel height, m h w heat transfer coefficient, W m −2 K −1 k thermal conductivity, W m −1 K −1 L channel length, m N number of cooling channels N u Nusselt number P channel perimeter, m p pressure, Pa P r Prandtl number q heat flux, W m −2 r chamber radius, m Re Reynolds number s w internal wall thickness, m T temperature, K t w rib thickness, m x, y, z length, height, and width coordinates, m Subscripts 0 total value aw adiabatic wall

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“…The scramjet engine is one of the most important propulsion technologies in aeronautics and astronautics nowadays, its flow supply system can be controlled by the flow rate control valve [4]. For scramjet engines, the flow rate control is important for the working performance and combustion quality of the aerospace engines when the working fluids were supplied to the engines [5,6]. The traditional flow rate control method in the flow supply system for scramjet engine is manual regulating, which has a low accuracy and bad repetitiveness.…”

Section: Introductionmentioning

confidence: 99%

Dynamic characteristics research of a high temperature flow-rate control valve

Zeng

Tong

Bai

et al. 2011

Proceedings of 2011 International Conference on Fluid Power and Mechatronics

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The high temperature flow-rate control valve is a key component to control the flow rate of fuel supply for scramjet engines. In this paper, a bellow-type flow rate control valve for high temperature working fuel is developed. The construction and working principle of the valve are introduced and the mathematical models of the valve are established. The dynamic characteristics of displacement are simulated by using Matlab/Simulink platform and experimented simultaneously. By comparing the simulation and experiment results, the dynamic response characteristics of flow rate can be studied, so the working reliability of the valve can be guaranteed. As a result, the flow rate of the valve can be controlled accurately according to the needs of fuel supply for scramjet engine.

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Thermo-and fluid mechanical analysis of high aspect ratio cooling channels

Cited by 18 publications

References 2 publications

Evolution of cooling-channel properties for varying aspect ratio

Evolution of cooling-channel properties for varying aspect ratio

Quasi-2D Modeling of High-Aspect-Ratio-Cooling-Channel Flows

Dynamic characteristics research of a high temperature flow-rate control valve

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