Experimental and Numerical Investigation of Thermal Stratification Effects

Woschnak, A.; Suslov, Dmitry; Oschwald, Michael

doi:10.2514/6.2003-4615

Cited by 45 publications

(27 citation statements)

References 3 publications

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“…They presented the results for a straight channel with gaseous hydrogen as the coolant and showed that the high aspect ratio cooling passages are showing lesser fatigue damage to the hot gas side wall. Woschnak et al (2003) developed a new solution strategy, called quasi 2-D approach * Corresponding author. Email: josetkm@tkmce.ac.in which takes into account thermal stratification.…”

Section: Introductionmentioning

confidence: 99%

Effect of Aspect Ratio on Supercritical Heat Transfer of Cryogenic Methane in Rocket Engine Cooling Channels

Arun¹,

Akhil²,

Noufal³

et al. 2017

Frontiers in Heat and Mass Transfer

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The supercritical turbulent flow of cryogenic methane flowing in a rocket engine cooing channel is numerically analysed by imposing constant heat flux at the bottom surface of the channel. The calculation scheme is validated by comparing the results obtained with experimental results reported in literature. The heat transfer coefficient is influenced by the strong variation in thermophysical properties of methane at super critical pressure. An increasing trend in the average value of Nusselt number is observed with aspect ratio. The efficacy of both Modified Jackson and Hall and Bishop empirical correlations in predicting Nusselt number is tested for cryogenic methane flowing in coolant channels.

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Section: Introductionmentioning

confidence: 99%

Effect of Aspect Ratio on Supercritical Heat Transfer of Cryogenic Methane in Rocket Engine Cooling Channels

Arun¹,

Akhil²,

Noufal³

et al. 2017

Frontiers in Heat and Mass Transfer

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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%

“…In fact, reducing wall temperature allows increasing engine life and cost of fabrication, as resulted during development and production of Space Shuttle main engine. However, it has been demonstrated [6] that if the channel aspect ratio is too high, the cooling e©ciency vanishes. In fact, in case of strongly asymmetric distributed heat §uxes around the channel perimeter and cooling geometries with high aspect ratios, limited coolant mixing and inhomogeneous temperature distribution (also referred to as ¤thermal strati¦cation¥) are expected.…”

Section: Introductionmentioning

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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“…Moreover, highly asymmetrical heating imposes a thermal strati¦cation along the channel, clearly demonstrated by experimental and numerical investigations [2,3]. The presence of the Dean secondary vortices in heated channel perturbs the thermal strati¦cation, increases mixing and enhances heat transfer at the concave side.…”

Section: Figure 1 Creation Of the Dean Vortices In A Curved Bendmentioning

confidence: 95%

“…The asymmetrical heat §ux is about 20 MW/m 2 , created from electrical heaters delivering up to 20 kW. Moreover, the EH3C channels re §ect real geometry of real engine channels [2] (high aspect-ratio channels). The obtained Reynolds number in this test case reaches 3·10 5 (∼ 2·10 6 for Vulcain con¦guration) and the Dean number is about 2 · 10 4 .…”

Section: Numerical Simulationsmentioning

confidence: 99%

Influence of curvature in regenerative cooling system of rocket engine

Torres¹,

Stefanini²,

Suslov³

2009

Progress in Propulsion Physics

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Thermomechanical loads in rocket engines can be drastically reduced by a reliable cooling system. The regenerative cooling system uses propellants as coolant which §ows through milled cooling channels in the chamber walls. Due to centrifugal forces, dynamic secondary motions appear in cooling-channel curvatures, which strongly modify heat transfer. Three-dimensional (3D) numerical calculations have been performed in order to compare this heat §ux modi¦cation with empirical correlations. Di¨erent turbulence models and wall treatments have been tested to develop a complete numerical data base about asymmetrical (concave side) heat transfer in curved cooling channels of rocket engine.

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Experimental and Numerical Investigation of Thermal Stratification Effects

Cited by 45 publications

References 3 publications

Effect of Aspect Ratio on Supercritical Heat Transfer of Cryogenic Methane in Rocket Engine Cooling Channels

Effect of Aspect Ratio on Supercritical Heat Transfer of Cryogenic Methane in Rocket Engine Cooling Channels

Evolution of cooling-channel properties for varying aspect ratio

Influence of curvature in regenerative cooling system of rocket engine

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