Effect of Boundary-Layer Bleed Hole Inclination Angle and Scaling on Flow Coefficient Behavior

Eichorn, Michael; Barnhart, Paul J.; Davis, David O.; Vyas, Manan A.; Slater, John W.

doi:10.2514/6.2013-424

Cited by 16 publications

(5 citation statements)

References 4 publications

(1 reference statement)

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“…To confirm the validation of the above numerical methods, the numerical results are compared with the experimental results conducted by Eichorn et al (2013) with the Mach number Ma=1.7. A normal single-hole with a diameter D=6.350 mm and a depth-to-diameter ratio of 0.250 is selected, which is denoted as configuration No.…”

Section: Numerical Simulation Methods and Validationsmentioning

confidence: 99%

Effects of bleed hole size on supersonic boundary layer bleed mass flow rate

Zhang

Zhao

Liu

2020

J. Zhejiang Univ. Sci. A

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The bleed hole diameter, depth, and boundary layer thickness are key design parameters of a supersonic bleed system. The evolution trend of single-hole bleed flow coefficient with the ratio of boundary layer thickness to bleed hole diameter and the ratio of bleed hole depth to diameter is investigated by numerical simulations under choking and non-choking conditions. The results show that the subsonic leading edge of the circular hole and the subsonic part of the boundary layer are the main factors causing lateral flow of the bleed hole. The effect of diameter on bleed mass flow rate is due to the viscous effect which reduces the effective diameter. The larger the ratio of displacement thickness to bleed hole diameter, the more obvious the viscous effect is. The depth affects bleed flow rate by changing the opening and closing states of the separation zone. When a certain depth is reached, the development of the boundary layer reduces the effective captured stream tube and thus reduces the bleed mass flow rate. The main objective of the study is to obtain the physical mechanism of the bleed hole size parameters affecting the bleed mass flow rate, and to provide theoretical guidance for the selection of the size of bleed holes in the design of a porous arrays bleed system in hypersonic inlets.

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Section: Numerical Simulation Methods and Validationsmentioning

confidence: 99%

Effects of bleed hole size on supersonic boundary layer bleed mass flow rate

Zhang

Zhao

Liu

2020

J. Zhejiang Univ. Sci. A

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“…In the past, several researchers investigated the effect of porous bleed experimentally. In contrast to real applications, the porous bleed regions in experiments are scaled in size, and only a small number of rows [1][2][3][4][5][6][7], or even a single hole [8][9][10], is investigated. Moreover, the porous bleed is only globally regarded, which means that only little information about the flow in the individual holes exists [11,12].…”

Section: Fig 1 Schematic Of the Flow Through A Porous Plate In Supers...mentioning

confidence: 99%

“…The finding that the performance of the first hole strongly differs from the downstream lying holes is essential for the evaluation of former experimental studies. Bodner et al [8], Davis et al [9], Eichorn et al [10] performed their experiments using a single hole only. Based on our results, the interaction of the holes needs to be considered as it affects the performance of the porous bleed.…”

Section: Fig 12 Local Surface Sonic Flow Coefficients For Various Thr...mentioning

confidence: 99%

Parameter Influence on the Porous Bleed Performance with & without Shock-Boundary Layer Interaction

Giehler

Grenson

Bur

2022

AIAA AVIATION 2022 Forum

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Porous bleed systems are a common technique to control shock-boundary layer interactions and/or supersonic boundary layer. However, the influence of various design parameters is still unknown. Even though bleed models are required to minimize the costs of the design process, they often do not include parameter effects. In the present study, the effect of the hole diameter, the porosity level, and the length-to-diameter ratio are investigated by means of three-dimensional RANS simulations. The findings show an influence of the hole diameter on both flow control and efficiency of the porous bleed. A significant impact of the porosity level on the effective control of the shock-boundary layer interaction is found. In contrast, the length-to-diameter ratio does not influence the effective control but affects the efficiency of the system.

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“…Для расчета систем слива ПС используются различные полуэмпирические модели, которые созданы на основе многочисленных экспериментальных данных. Большое количество таких данных позволяет разрабатывать и верифицировать различные аналитические подходы [12] и одновременно является причиной противоречивости некоторых результатов в силу многопараметрического характера задачи. Вместе с экспериментальными исследованиями и аналитическими моделями последнее время широко используются методы численного моделирования [13; 14].…”

Section: Introductionunclassified

Influence of Flow Speed on the Compression Surfaces of Inlet on Efficiency of the Boundary Layer Bleed

Goldfeld

2019

SJPhys

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The paper presents the results of analytical and experimental study of the bleed coefficient at high flight Mach numbers from 3 to 7. For the calculation, an analytical model was used model with a fixed exit in the supercritical bleed mode, which allows varying the bleed air mass depending on flow conditions and parameter bleed system. The measurement of the bleed flow coefficients were performed for three bleed configurations in a wind tunnel at local Mach numbers in front of the bleed area from 2.5 to 5.96. The model had a long forebody, so that before the bleed area there was a thick boundary layer. As a result, new experimental data on bleed coefficient and its general dependence on the Mach numbers up to 6 and the bleed angles of 90 and 45° were obtained. It is revealed that at increase in the local Mach number, the tendency is observed towards a decrease in the bleed coefficient, and this tendency intensifies with decrease in the bleed channel inclination. These data were used to evaluate known analytical models to determine the characteristics of bleed systems at hypersonic flow velocity analytical models to determine the characteristics of bleed systems at hypersonic flow velocity.

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Effect of Boundary-Layer Bleed Hole Inclination Angle and Scaling on Flow Coefficient Behavior

Cited by 16 publications

References 4 publications

Effects of bleed hole size on supersonic boundary layer bleed mass flow rate

Effects of bleed hole size on supersonic boundary layer bleed mass flow rate

Parameter Influence on the Porous Bleed Performance with & without Shock-Boundary Layer Interaction

Influence of Flow Speed on the Compression Surfaces of Inlet on Efficiency of the Boundary Layer Bleed

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